-- mpv-osc-morden by maoiscat
-- email:valarmor@163.com
-- https://github.com/maoiscat/mpv-osc-morden

-- fork by cyl0
-- https://github.com/cyl0/mpv-osc-morden-x

local assdraw = require 'mp.assdraw'
local msg = require 'mp.msg'
local opt = require 'mp.options'
local utils = require 'mp.utils'

--
-- Parameters
--
-- default user option values
-- may change them in osc.conf
local user_opts = {
    showwindowed = true,        -- show OSC when windowed?
    showfullscreen = true,      -- show OSC when fullscreen?
    scalewindowed = 1.0,        -- scaling of the controller when windowed
    scalefullscreen = 1.0,      -- scaling of the controller when fullscreen
    scaleforcedwindow = 1.0,    -- scaling when rendered on a forced window
    vidscale = false,           -- scale the controller with the video?
    hidetimeout = 1500,         -- duration in ms until the OSC hides if no
                                -- mouse movement. enforced non-negative for the
                                -- user, but internally negative is 'always-on'.
    fadeduration = 250,         -- duration of fade out in ms, 0 = no fade
    minmousemove = 1,           -- minimum amount of pixels the mouse has to
                                -- move between ticks to make the OSC show up
    iamaprogrammer = false,     -- use native mpv values and disable OSC
                                -- internal track list management (and some
                                -- functions that depend on it)
    font = 'mpv-osd-symbols',	-- default osc font
    seekbarhandlesize = 1.0,	-- size ratio of the slider handle, range 0 ~ 1
    seekrange = true,		-- show seekrange overlay
    seekrangealpha = 64,      	-- transparency of seekranges
    seekbarkeyframes = true,    -- use keyframes when dragging the seekbar
    showjump = true,            -- show "jump forward/backward 5 seconds" buttons 
                                -- shift+left-click to step 1 frame and 
                                -- right-click to jump 1 minute
    jumpamount = 5,             -- change the jump amount (in seconds by default)
    jumpiconnumber = true,      -- show different icon when jumpamount is 5, 10, or 30
    jumpmode = 'exact',         -- seek mode for jump buttons. e.g.
                                -- 'exact', 'relative+keyframes', etc.
    title = '${media-title}',   -- string compatible with property-expansion
                                -- to be shown as OSC title
    showtitle = true,		-- show title in OSC
    showonpause = true,         -- whether to disable the hide timeout on pause
    timetotal = true,          	-- display total time instead of remaining time?
    timems = false,             -- Display time down to millliseconds by default
    visibility = 'auto',        -- only used at init to set visibility_mode(...)
    windowcontrols = 'no',    -- whether to show window controls
    language = 'eng',		-- eng=English, chs=Chinese
    keyboardnavigation = false, -- enable directional keyboard navigation
    chapter_fmt = "Chapter: %s", -- chapter print format for seekbar-hover. "no" to disable
}

-- Icons for jump button depending on jumpamount 
local jumpicons = { 
    [5] = {'\xEF\x8E\xB1', '\xEF\x8E\xA3'}, 
    [10] = {'\xEF\x8E\xAF', '\xEF\x8E\xA1'}, 
    [30] = {'\xEF\x8E\xB0', '\xEF\x8E\xA2'}, 
    default = {'\xEF\x8E\xB2', '\xEF\x8E\xB2'}, -- second icon is mirrored in layout() 
} 

-- Localization
local language = {
	['eng'] = {
	    welcome = '{\\fs24\\1c&H0&\\1c&HFFFFFF&}Drop files or URLs to play here.',  -- this text appears when mpv starts
		off = 'OFF',
		na = 'n/a',
		none = 'none',
		video = 'Video',
		audio = 'Audio',
		subtitle = 'Subtitle',
		available = 'Available ',
		track = ' Tracks:',
		playlist = 'Playlist',
		nolist = 'Empty playlist.',
		chapter = 'Chapter',
		nochapter = 'No chapters.',
	},
	['chs'] = {
		welcome = '{\\1c&H00\\bord0\\fs30\\fn微软雅黑 light\\fscx125}MPV{\\fscx100} 播放器',  -- this text appears when mpv starts
		off = '关闭',
		na = 'n/a',
		none = '无',
		video = '视频',
		audio = '音频',
		subtitle = '字幕',
		available = '可选',
		track = '：',
		playlist = '播放列表',
		nolist = '无列表信息',
		chapter = '章节',
		nochapter = '无章节信息',
	}
}
-- read options from config and command-line
opt.read_options(user_opts, 'osc', function(list) update_options(list) end)
-- apply lang opts
local texts = language[user_opts.language]
local osc_param = { -- calculated by osc_init()
    playresy = 0,                           -- canvas size Y
    playresx = 0,                           -- canvas size X
    display_aspect = 1,
    unscaled_y = 0,
    areas = {},
}

local osc_styles = {
    TransBg = '{\\blur100\\bord150\\1c&H000000&\\3c&H000000&}',
    SeekbarBg = '{\\blur0\\bord0\\1c&HFFFFFF&}',
    SeekbarFg = '{\\blur1\\bord1\\1c&HE39C42&}',
    Ctrl1 = '{\\blur0\\bord0\\1c&HFFFFFF&\\3c&HFFFFFF&\\fs36\\fnmaterial-design-iconic-font}',
    Ctrl2 = '{\\blur0\\bord0\\1c&HFFFFFF&\\3c&HFFFFFF&\\fs30\\fnmaterial-design-iconic-font}',
    Ctrl2Flip = '{\\blur0\\bord0\\1c&HFFFFFF&\\3c&HFFFFFF&\\fs30\\fnmaterial-design-iconic-font\\fry180',
    Ctrl3 = '{\\blur0\\bord0\\1c&HFFFFFF&\\3c&HFFFFFF&\\fs30\\fnmaterial-design-iconic-font}',
    Time = '{\\blur0\\bord0\\1c&HFFFFFF&\\3c&H000000&\\fs20\\fn' .. user_opts.font .. '}',
    Tooltip = '{\\blur1\\bord0.5\\1c&HFFFFFF&\\3c&H000000&\\fs18\\fn' .. user_opts.font .. '}',
    Title = '{\\blur1\\bord0.5\\1c&HFFFFFF&\\3c&H0\\fs32\\q2\\fn' .. user_opts.font .. '}',
    WinCtrl = '{\\blur1\\bord0.5\\1c&HFFFFFF&\\3c&H0\\fs20\\fnmpv-osd-symbols}',
    elementDown = '{\\1c&H999999&}',
    elementHighlight = '{\\blur1\\bord1\\1c&HFFC033&}',
}

-- internal states, do not touch
local state = {
    showtime,                               -- time of last invocation (last mouse move)
    osc_visible = false,
    anistart,                               -- time when the animation started
    anitype,                                -- current type of animation
    animation,                              -- current animation alpha
    mouse_down_counter = 0,                 -- used for softrepeat
    active_element = nil,                   -- nil = none, 0 = background, 1+ = see elements[]
    active_event_source = nil,              -- the 'button' that issued the current event
    rightTC_trem = not user_opts.timetotal, -- if the right timecode should display total or remaining time
    mp_screen_sizeX, mp_screen_sizeY,       -- last screen-resolution, to detect resolution changes to issue reINITs
    initREQ = false,                        -- is a re-init request pending?
    last_mouseX, last_mouseY,               -- last mouse position, to detect significant mouse movement
    mouse_in_window = false,
    message_text,
    message_hide_timer,
    fullscreen = false,
    tick_timer = nil,
    tick_last_time = 0,                     -- when the last tick() was run
    hide_timer = nil,
    cache_state = nil,
    idle = false,
    enabled = true,
    input_enabled = true,
    showhide_enabled = false,
    dmx_cache = 0,
    border = true,
    maximized = false,
    osd = mp.create_osd_overlay('ass-events'),
    lastvisibility = user_opts.visibility,	-- save last visibility on pause if showonpause
    fulltime = user_opts.timems,
    highlight_element = 'cy_audio',
    chapter_list = {},                      -- sorted by time
}

local window_control_box_width = 138
local tick_delay = 0.03

--- Automatically disable OSC
local builtin_osc_enabled = mp.get_property_native('osc')
if builtin_osc_enabled then
    mp.set_property_native('osc', false)
end

--


-- WindowControl helpers
function window_controls_enabled()
    val = user_opts.windowcontrols
    if val == 'auto' then
        return (not state.border) or state.fullscreen
    else
        return val ~= 'no'
    end
end



function build_keyboard_controls()

    -- prepare the main button row
    local bottom_button_line = {}
    table.insert(bottom_button_line, 'cy_audio')
    table.insert(bottom_button_line, 'cy_sub')
    table.insert(bottom_button_line, 'pl_prev')
    table.insert(bottom_button_line, 'skipback')
    if user_opts.showjump then
        table.insert(bottom_button_line, 'jumpback')
    end
    table.insert(bottom_button_line, 'playpause')
    if user_opts.showjump then
        table.insert(bottom_button_line, 'jumpfrwd')
    end
    table.insert(bottom_button_line, 'skipfrwd')
    table.insert(bottom_button_line, 'pl_next')
    table.insert(bottom_button_line, 'tog_info')
    table.insert(bottom_button_line, 'tog_fs')

    -- build up the main mapping object
    local mapping = {}
    if window_controls_enabled() then
        table.insert(mapping, {
            'minimize',
            'maximize',
            'close'
        })
    end
    table.insert(mapping, {
        'seekbar'
    })
    table.insert(mapping, bottom_button_line)

    return mapping
end


--
-- Helperfunctions
--

function set_osd(res_x, res_y, text)
    if state.osd.res_x == res_x and
       state.osd.res_y == res_y and
       state.osd.data == text then
        return
    end
    state.osd.res_x = res_x
    state.osd.res_y = res_y
    state.osd.data = text
    state.osd.z = 1000
    state.osd:update()
end

-- scale factor for translating between real and virtual ASS coordinates
function get_virt_scale_factor()
    local w, h = mp.get_osd_size()
    if w <= 0 or h <= 0 then
        return 0, 0
    end
    return osc_param.playresx / w, osc_param.playresy / h
end

-- return mouse position in virtual ASS coordinates (playresx/y)
function get_virt_mouse_pos()
    if state.mouse_in_window then
        local sx, sy = get_virt_scale_factor()
        local x, y = mp.get_mouse_pos()
        return x * sx, y * sy
    else
        return -1, -1
    end
end

function set_virt_mouse_area(x0, y0, x1, y1, name)
    local sx, sy = get_virt_scale_factor()
    mp.set_mouse_area(x0 / sx, y0 / sy, x1 / sx, y1 / sy, name)
end

function scale_value(x0, x1, y0, y1, val)
    local m = (y1 - y0) / (x1 - x0)
    local b = y0 - (m * x0)
    return (m * val) + b
end

-- returns hitbox spanning coordinates (top left, bottom right corner)
-- according to alignment
function get_hitbox_coords(x, y, an, w, h)

    local alignments = {
      [1] = function () return x, y-h, x+w, y end,
      [2] = function () return x-(w/2), y-h, x+(w/2), y end,
      [3] = function () return x-w, y-h, x, y end,

      [4] = function () return x, y-(h/2), x+w, y+(h/2) end,
      [5] = function () return x-(w/2), y-(h/2), x+(w/2), y+(h/2) end,
      [6] = function () return x-w, y-(h/2), x, y+(h/2) end,

      [7] = function () return x, y, x+w, y+h end,
      [8] = function () return x-(w/2), y, x+(w/2), y+h end,
      [9] = function () return x-w, y, x, y+h end,
    }

    return alignments[an]()
end

function get_hitbox_coords_geo(geometry)
    return get_hitbox_coords(geometry.x, geometry.y, geometry.an,
        geometry.w, geometry.h)
end

function get_element_hitbox(element)
    return element.hitbox.x1, element.hitbox.y1,
        element.hitbox.x2, element.hitbox.y2
end

function mouse_hit(element)
    return mouse_hit_coords(get_element_hitbox(element))
end

function mouse_hit_coords(bX1, bY1, bX2, bY2)
    local mX, mY = get_virt_mouse_pos()
    return (mX >= bX1 and mX <= bX2 and mY >= bY1 and mY <= bY2)
end

function limit_range(min, max, val)
    if val > max then
        val = max
    elseif val < min then
        val = min
    end
    return val
end

-- translate value into element coordinates
function get_slider_ele_pos_for(element, val)

    local ele_pos = scale_value(
        element.slider.min.value, element.slider.max.value,
        element.slider.min.ele_pos, element.slider.max.ele_pos,
        val)

    return limit_range(
        element.slider.min.ele_pos, element.slider.max.ele_pos,
        ele_pos)
end

-- translates global (mouse) coordinates to value
function get_slider_value_at(element, glob_pos)

    local val = scale_value(
        element.slider.min.glob_pos, element.slider.max.glob_pos,
        element.slider.min.value, element.slider.max.value,
        glob_pos)

    return limit_range(
        element.slider.min.value, element.slider.max.value,
        val)
end

-- get value at current mouse position
function get_slider_value(element)
    return get_slider_value_at(element, get_virt_mouse_pos())
end

function countone(val)
    if not (user_opts.iamaprogrammer) then
        val = val + 1
    end
    return val
end

-- multiplies two alpha values, formular can probably be improved
function mult_alpha(alphaA, alphaB)
    return 255 - (((1-(alphaA/255)) * (1-(alphaB/255))) * 255)
end

function add_area(name, x1, y1, x2, y2)
    -- create area if needed
    if (osc_param.areas[name] == nil) then
        osc_param.areas[name] = {}
    end
    table.insert(osc_param.areas[name], {x1=x1, y1=y1, x2=x2, y2=y2})
end

function ass_append_alpha(ass, alpha, modifier)
    local ar = {}

    for ai, av in pairs(alpha) do
        av = mult_alpha(av, modifier)
        if state.animation then
            av = mult_alpha(av, state.animation)
        end
        ar[ai] = av
    end

    ass:append(string.format('{\\1a&H%X&\\2a&H%X&\\3a&H%X&\\4a&H%X&}',
               ar[1], ar[2], ar[3], ar[4]))
end

function ass_draw_cir_cw(ass, x, y, r)
	ass:round_rect_cw(x-r, y-r, x+r, y+r, r)
end

function ass_draw_rr_h_cw(ass, x0, y0, x1, y1, r1, hexagon, r2)
    if hexagon then
        ass:hexagon_cw(x0, y0, x1, y1, r1, r2)
    else
        ass:round_rect_cw(x0, y0, x1, y1, r1, r2)
    end
end

function ass_draw_rr_h_ccw(ass, x0, y0, x1, y1, r1, hexagon, r2)
    if hexagon then
        ass:hexagon_ccw(x0, y0, x1, y1, r1, r2)
    else
        ass:round_rect_ccw(x0, y0, x1, y1, r1, r2)
    end
end


--
-- Tracklist Management
--

local nicetypes = {video = texts.video, audio = texts.audio, sub = texts.subtitle}

-- updates the OSC internal playlists, should be run each time the track-layout changes
function update_tracklist()
    local tracktable = mp.get_property_native('track-list', {})

    -- by osc_id
    tracks_osc = {}
    tracks_osc.video, tracks_osc.audio, tracks_osc.sub = {}, {}, {}
    -- by mpv_id
    tracks_mpv = {}
    tracks_mpv.video, tracks_mpv.audio, tracks_mpv.sub = {}, {}, {}
    for n = 1, #tracktable do
        if not (tracktable[n].type == 'unknown') then
            local type = tracktable[n].type
            local mpv_id = tonumber(tracktable[n].id)

            -- by osc_id
            table.insert(tracks_osc[type], tracktable[n])

            -- by mpv_id
            tracks_mpv[type][mpv_id] = tracktable[n]
            tracks_mpv[type][mpv_id].osc_id = #tracks_osc[type]
        end
    end
end

-- return a nice list of tracks of the given type (video, audio, sub)
function get_tracklist(type)
    local msg = texts.available .. nicetypes[type] .. texts.track
    if #tracks_osc[type] == 0 then
        msg = msg .. texts.none
    else
        for n = 1, #tracks_osc[type] do
            local track = tracks_osc[type][n]
            local lang, title, selected = 'unknown', '', '○'
            if not(track.lang == nil) then lang = track.lang end
            if not(track.title == nil) then title = track.title end
            if (track.id == tonumber(mp.get_property(type))) then
                selected = '●'
            end
            msg = msg..'\n'..selected..' '..n..': ['..lang..'] '..title
        end
    end
    return msg
end

-- relatively change the track of given <type> by <next> tracks
    --(+1 -> next, -1 -> previous)
function set_track(type, next)
    local current_track_mpv, current_track_osc
    if (mp.get_property(type) == 'no') then
        current_track_osc = 0
    else
        current_track_mpv = tonumber(mp.get_property(type))
        current_track_osc = tracks_mpv[type][current_track_mpv].osc_id
    end
    local new_track_osc = (current_track_osc + next) % (#tracks_osc[type] + 1)
    local new_track_mpv
    if new_track_osc == 0 then
        new_track_mpv = 'no'
    else
        new_track_mpv = tracks_osc[type][new_track_osc].id
    end

    mp.commandv('set', type, new_track_mpv)

--	if (new_track_osc == 0) then
--        show_message(nicetypes[type] .. ' Track: none')
--    else
--        show_message(nicetypes[type]  .. ' Track: '
--            .. new_track_osc .. '/' .. #tracks_osc[type]
--            .. ' ['.. (tracks_osc[type][new_track_osc].lang or 'unknown') ..'] '
--            .. (tracks_osc[type][new_track_osc].title or ''))
--    end
end

-- get the currently selected track of <type>, OSC-style counted
function get_track(type)
    local track = mp.get_property(type)
    if track ~= 'no' and track ~= nil then
        local tr = tracks_mpv[type][tonumber(track)]
        if tr then
            return tr.osc_id
        end
    end
    return 0
end

--
-- Element Management
--

local elements = {}

function prepare_elements()

    -- remove elements without layout or invisble
    local elements2 = {}
    for n, element in pairs(elements) do
        if not (element.layout == nil) and (element.visible) then
            table.insert(elements2, element)
        end
    end
    elements = elements2

    function elem_compare (a, b)
        return a.layout.layer < b.layout.layer
    end

    table.sort(elements, elem_compare)


    for _,element in pairs(elements) do

        local elem_geo = element.layout.geometry

        -- Calculate the hitbox
        local bX1, bY1, bX2, bY2 = get_hitbox_coords_geo(elem_geo)
        element.hitbox = {x1 = bX1, y1 = bY1, x2 = bX2, y2 = bY2}

        local style_ass = assdraw.ass_new()

        -- prepare static elements
        style_ass:append('{}') -- hack to troll new_event into inserting a \n
        style_ass:new_event()
        style_ass:pos(elem_geo.x, elem_geo.y)
        style_ass:an(elem_geo.an)
        style_ass:append(element.layout.style)

        element.style_ass = style_ass

        local static_ass = assdraw.ass_new()


        if (element.type == 'box') then
            --draw box
            static_ass:draw_start()
            ass_draw_rr_h_cw(static_ass, 0, 0, elem_geo.w, elem_geo.h,
                             element.layout.box.radius, element.layout.box.hexagon)
            static_ass:draw_stop()

        elseif (element.type == 'slider') then
            --draw static slider parts
            local slider_lo = element.layout.slider
            -- calculate positions of min and max points
			element.slider.min.ele_pos = user_opts.seekbarhandlesize * elem_geo.h / 2
			element.slider.max.ele_pos = elem_geo.w - element.slider.min.ele_pos
            element.slider.min.glob_pos = element.hitbox.x1 + element.slider.min.ele_pos
            element.slider.max.glob_pos = element.hitbox.x1 + element.slider.max.ele_pos

            static_ass:draw_start()
			-- a hack which prepares the whole slider area to allow center placements such like an=5
			static_ass:rect_cw(0, 0, elem_geo.w, elem_geo.h)
			static_ass:rect_ccw(0, 0, elem_geo.w, elem_geo.h)
            -- marker nibbles
            if not (element.slider.markerF == nil) and (slider_lo.gap > 0) then
                local markers = element.slider.markerF()
                for _,marker in pairs(markers) do
                    if (marker >= element.slider.min.value) and (marker <= element.slider.max.value) then
                        local s = get_slider_ele_pos_for(element, marker)
                        if (slider_lo.gap > 5) then -- draw triangles
                            --top
                            if (slider_lo.nibbles_top) then
                                static_ass:move_to(s - 3, slider_lo.gap - 5)
                                static_ass:line_to(s + 3, slider_lo.gap - 5)
                                static_ass:line_to(s, slider_lo.gap - 1)
                            end
                            --bottom
                            if (slider_lo.nibbles_bottom) then
                                static_ass:move_to(s - 3, elem_geo.h - slider_lo.gap + 5)
								static_ass:line_to(s, elem_geo.h - slider_lo.gap + 1)
                                static_ass:line_to(s + 3, elem_geo.h - slider_lo.gap + 5)
                            end
                        else -- draw 2x1px nibbles
                            --top
                            if (slider_lo.nibbles_top) then
                                static_ass:rect_cw(s - 1, 0, s + 1, slider_lo.gap);
                            end
                            --bottom
                            if (slider_lo.nibbles_bottom) then
                                static_ass:rect_cw(s - 1, elem_geo.h-slider_lo.gap, s + 1, elem_geo.h);
                            end
                        end
                    end
                end
            end
        end

        element.static_ass = static_ass

        -- if the element is supposed to be disabled,
        -- style it accordingly and kill the eventresponders
        if not (element.enabled) then
            element.layout.alpha[1] = 136
            element.eventresponder = nil
        end
        -- gray out the element if it is toggled off
        if (element.off) then
            element.layout.alpha[1] = 136
        end

    end
end

--
-- Element Rendering
--

-- returns nil or a chapter element from the native property chapter-list
function get_chapter(possec)
    local cl = state.chapter_list  -- sorted, get latest before possec, if any

    for n=#cl,1,-1 do
        if possec >= cl[n].time then
            return cl[n]
        end
    end
end

function render_elements(master_ass)
    -- when the slider is dragged or hovered and we have a target chapter name
    -- then we use it instead of the normal title. we calculate it before the
    -- render iterations because the title may be rendered before the slider.
    state.forced_title = nil
    local se, ae = state.slider_element, elements[state.active_element]
    if user_opts.chapter_fmt ~= "no" and se and (ae == se or (not ae and mouse_hit(se))) then
        local dur = mp.get_property_number("duration", 0)
        if dur > 0 then
            local possec = get_slider_value(se) * dur / 100 -- of mouse pos
            local ch = get_chapter(possec)
            if ch and ch.title and ch.title ~= "" then
                state.forced_title = string.format(user_opts.chapter_fmt, ch.title)
            end
        end
    end

    for n=1, #elements do
        local element = elements[n]
        local style_ass = assdraw.ass_new()
        style_ass:merge(element.style_ass)
        ass_append_alpha(style_ass, element.layout.alpha, 0)

        if element.eventresponder and (state.active_element == n) then
            -- run render event functions
            if not (element.eventresponder.render == nil) then
                element.eventresponder.render(element)
            end
            if mouse_hit(element) then
                -- mouse down styling
                if (element.styledown) then
                    style_ass:append(osc_styles.elementDown)
                end
                if (element.softrepeat) and (state.mouse_down_counter >= 15
                    and state.mouse_down_counter % 5 == 0) then

                    element.eventresponder[state.active_event_source..'_down'](element)
                end
                state.mouse_down_counter = state.mouse_down_counter + 1
            end
        end

        if user_opts.keyboardnavigation and state.highlight_element == element.name then
            style_ass:append(osc_styles.elementHighlight)
        end
        
        local elem_ass = assdraw.ass_new()
        elem_ass:merge(style_ass)
        
        if not (element.type == 'button') then
            elem_ass:merge(element.static_ass)
        end

        if (element.type == 'slider') then

            local slider_lo = element.layout.slider
            local elem_geo = element.layout.geometry
            local s_min = element.slider.min.value
            local s_max = element.slider.max.value
            -- draw pos marker
            local pos = element.slider.posF()
            local seekRanges = element.slider.seekRangesF()
			local rh = user_opts.seekbarhandlesize * elem_geo.h / 2 -- Handle radius
            local xp
            
            if pos then
                xp = get_slider_ele_pos_for(element, pos)
				ass_draw_cir_cw(elem_ass, xp, elem_geo.h/2, rh)
				elem_ass:rect_cw(0, slider_lo.gap, xp, elem_geo.h - slider_lo.gap)
            end

            if seekRanges then
				elem_ass:draw_stop()
				elem_ass:merge(element.style_ass)
				ass_append_alpha(elem_ass, element.layout.alpha, user_opts.seekrangealpha)
				elem_ass:merge(element.static_ass)

                for _,range in pairs(seekRanges) do
                    local pstart = get_slider_ele_pos_for(element, range['start'])
                    local pend = get_slider_ele_pos_for(element, range['end'])
					elem_ass:rect_cw(pstart - rh, slider_lo.gap, pend + rh, elem_geo.h - slider_lo.gap)
                end
            end

            elem_ass:draw_stop()
            
            -- add tooltip
            if not (element.slider.tooltipF == nil) then
                if mouse_hit(element) then
                    local sliderpos = get_slider_value(element)
                    local tooltiplabel = element.slider.tooltipF(sliderpos)
                    local an = slider_lo.tooltip_an
                    local ty
                    if (an == 2) then
                        ty = element.hitbox.y1
                    else
                        ty = element.hitbox.y1 + elem_geo.h/2
                    end

                    local tx = get_virt_mouse_pos()
                    if (slider_lo.adjust_tooltip) then
                        if (an == 2) then
                            if (sliderpos < (s_min + 3)) then
                                an = an - 1
                            elseif (sliderpos > (s_max - 3)) then
                                an = an + 1
                            end
                        elseif (sliderpos > (s_max-s_min)/2) then
                            an = an + 1
                            tx = tx - 5
                        else
                            an = an - 1
                            tx = tx + 10
                        end
                    end

                    -- tooltip label
                    elem_ass:new_event()
                    elem_ass:pos(tx, ty)
                    elem_ass:an(an)
                    elem_ass:append(slider_lo.tooltip_style)
                    ass_append_alpha(elem_ass, slider_lo.alpha, 0)
                    elem_ass:append(tooltiplabel)
                end
            end

        elseif (element.type == 'button') then

            local buttontext
            if type(element.content) == 'function' then
                buttontext = element.content() -- function objects
            elseif not (element.content == nil) then
                buttontext = element.content -- text objects
            end
			
			buttontext = buttontext:gsub(':%((.?.?.?)%) unknown ', ':%(%1%)')  --gsub('%) unknown %(\'', '')

            local maxchars = element.layout.button.maxchars
            -- 认为1个中文字符约等于1.5个英文字符
            -- local charcount = buttontext:len()-  (buttontext:len()-select(2, buttontext:gsub('[^\128-\193]', '')))/1.5
            local charcount = (buttontext:len() + select(2, buttontext:gsub('[^\128-\193]', ''))*2) / 3
            if not (maxchars == nil) and (charcount > maxchars) then
                local limit = math.max(0, maxchars - 3)
                if (charcount > limit) then
                    while (charcount > limit) do
                        buttontext = buttontext:gsub('.[\128-\191]*$', '')
						charcount = (buttontext:len() + select(2, buttontext:gsub('[^\128-\193]', ''))*2) / 3
                    end
                    buttontext = buttontext .. '...'
                end
            end

            elem_ass:append(buttontext)
            
            -- add tooltip
			if not (element.tooltipF == nil) and element.enabled then
                if mouse_hit(element) then
                    local tooltiplabel = element.tooltipF
                    local an = 1
                    local ty = element.hitbox.y1
                    local tx = get_virt_mouse_pos()
                    
                    if ty < osc_param.playresy / 2 then
						ty = element.hitbox.y2
						an = 7
					end

                    -- tooltip label
                    if type(element.tooltipF) == 'function' then
						tooltiplabel = element.tooltipF()
					else
						tooltiplabel = element.tooltipF
					end
                    elem_ass:new_event()
                    elem_ass:pos(tx, ty)
                    elem_ass:an(an)
                    elem_ass:append(element.tooltip_style)
                    elem_ass:append(tooltiplabel)
                end
			end
        end

        master_ass:merge(elem_ass)
    end
end

--
-- Message display
--

-- pos is 1 based
function limited_list(prop, pos)
    local proplist = mp.get_property_native(prop, {})
    local count = #proplist
    if count == 0 then
        return count, proplist
    end

    local fs = tonumber(mp.get_property('options/osd-font-size'))
    local max = math.ceil(osc_param.unscaled_y*0.75 / fs)
    if max % 2 == 0 then
        max = max - 1
    end
    local delta = math.ceil(max / 2) - 1
    local begi = math.max(math.min(pos - delta, count - max + 1), 1)
    local endi = math.min(begi + max - 1, count)

    local reslist = {}
    for i=begi, endi do
        local item = proplist[i]
        item.current = (i == pos) and true or nil
        table.insert(reslist, item)
    end
    return count, reslist
end

function get_playlist()
    local pos = mp.get_property_number('playlist-pos', 0) + 1
    local count, limlist = limited_list('playlist', pos)
    if count == 0 then
        return texts.nolist
    end

    local message = string.format(texts.playlist .. ' [%d/%d]:\n', pos, count)
    for i, v in ipairs(limlist) do
        local title = v.title
        local _, filename = utils.split_path(v.filename)
        if title == nil then
            title = filename
        end
        message = string.format('%s %s %s\n', message,
            (v.current and '●' or '○'), title)
    end
    return message
end

function get_chapterlist()
    local pos = mp.get_property_number('chapter', 0) + 1
    local count, limlist = limited_list('chapter-list', pos)
    if count == 0 then
        return texts.nochapter
    end

    local message = string.format(texts.chapter.. ' [%d/%d]:\n', pos, count)
    for i, v in ipairs(limlist) do
        local time = mp.format_time(v.time)
        local title = v.title
        if title == nil then
            title = string.format(texts.chapter .. ' %02d', i)
        end
        message = string.format('%s[%s] %s %s\n', message, time,
            (v.current and '●' or '○'), title)
    end
    return message
end

function show_message(text, duration)

    --print('text: '..text..'   duration: ' .. duration)
    if duration == nil then
        duration = tonumber(mp.get_property('options/osd-duration')) / 1000
    elseif not type(duration) == 'number' then
        print('duration: ' .. duration)
    end

    -- cut the text short, otherwise the following functions
    -- may slow down massively on huge input
    text = string.sub(text, 0, 4000)

    -- replace actual linebreaks with ASS linebreaks
    text = string.gsub(text, '\n', '\\N')

    state.message_text = text

    if not state.message_hide_timer then
        state.message_hide_timer = mp.add_timeout(0, request_tick)
    end
    state.message_hide_timer:kill()
    state.message_hide_timer.timeout = duration
    state.message_hide_timer:resume()
    request_tick()
end

function render_message(ass)
    if state.message_hide_timer and state.message_hide_timer:is_enabled() and
       state.message_text
    then
        local _, lines = string.gsub(state.message_text, '\\N', '')

        local fontsize = tonumber(mp.get_property('options/osd-font-size'))
        local outline = tonumber(mp.get_property('options/osd-border-size'))
        local maxlines = math.ceil(osc_param.unscaled_y*0.75 / fontsize)
        local counterscale = osc_param.playresy / osc_param.unscaled_y

        fontsize = fontsize * counterscale / math.max(0.65 + math.min(lines/maxlines, 1), 1)
        outline = outline * counterscale / math.max(0.75 + math.min(lines/maxlines, 1)/2, 1)

        local style = '{\\bord' .. outline .. '\\fs' .. fontsize .. '}'


        ass:new_event()
        ass:append(style .. state.message_text)
    else
        state.message_text = nil
    end
end

--
-- Initialisation and Layout
--

function new_element(name, type)
    elements[name] = {}
    elements[name].type = type
    elements[name].name = name

    -- add default stuff
    elements[name].eventresponder = {}
    elements[name].visible = true
    elements[name].enabled = true
    elements[name].softrepeat = false
    elements[name].styledown = (type == 'button')
    elements[name].state = {}

    if (type == 'slider') then
        elements[name].slider = {min = {value = 0}, max = {value = 100}}
    end


    return elements[name]
end

function add_layout(name)
    if not (elements[name] == nil) then
        -- new layout
        elements[name].layout = {}

        -- set layout defaults
        elements[name].layout.layer = 50
        elements[name].layout.alpha = {[1] = 0, [2] = 255, [3] = 255, [4] = 255}

        if (elements[name].type == 'button') then
            elements[name].layout.button = {
                maxchars = nil,
            }
        elseif (elements[name].type == 'slider') then
            -- slider defaults
            elements[name].layout.slider = {
                border = 1,
                gap = 1,
                nibbles_top = true,
                nibbles_bottom = true,
                adjust_tooltip = true,
                tooltip_style = '',
                tooltip_an = 2,
                alpha = {[1] = 0, [2] = 255, [3] = 88, [4] = 255},
            }
        elseif (elements[name].type == 'box') then
            elements[name].layout.box = {radius = 0, hexagon = false}
        end

        return elements[name].layout
    else
        msg.error('Can\'t add_layout to element \''..name..'\', doesn\'t exist.')
    end
end

-- Window Controls
function window_controls()
    local wc_geo = {
        x = 0,
        y = 32,
        an = 1,
        w = osc_param.playresx,
        h = 32,
    }

    local controlbox_w = window_control_box_width
    local titlebox_w = wc_geo.w - controlbox_w

    -- Default alignment is 'right'
    local controlbox_left = wc_geo.w - controlbox_w
    local titlebox_left = wc_geo.x
    local titlebox_right = wc_geo.w - controlbox_w

    add_area('window-controls',
             get_hitbox_coords(controlbox_left, wc_geo.y, wc_geo.an,
                               controlbox_w, wc_geo.h))

    local lo

    local button_y = wc_geo.y - (wc_geo.h / 2)
    local first_geo =
        {x = controlbox_left + 27, y = button_y, an = 5, w = 40, h = wc_geo.h}
    local second_geo =
        {x = controlbox_left + 69, y = button_y, an = 5, w = 40, h = wc_geo.h}
    local third_geo =
        {x = controlbox_left + 115, y = button_y, an = 5, w = 40, h = wc_geo.h}

    -- Window control buttons use symbols in the custom mpv osd font
    -- because the official unicode codepoints are sufficiently
    -- exotic that a system might lack an installed font with them,
    -- and libass will complain that they are not present in the
    -- default font, even if another font with them is available.

    -- Close: ??
    ne = new_element('close', 'button')
    ne.content = '\238\132\149'
    ne.eventresponder['mbtn_left_up'] =
        function () mp.commandv('quit') end
    lo = add_layout('close')
    lo.geometry = third_geo
    lo.style = osc_styles.WinCtrl
    lo.alpha[3] = 0

    -- Minimize: ??
    ne = new_element('minimize', 'button')
    ne.content = '\\n\238\132\146'
    ne.eventresponder['mbtn_left_up'] =
        function () mp.commandv('cycle', 'window-minimized') end
    lo = add_layout('minimize')
    lo.geometry = first_geo
    lo.style = osc_styles.WinCtrl
    lo.alpha[3] = 0
    
    -- Maximize: ?? /??
    ne = new_element('maximize', 'button')
    if state.maximized or state.fullscreen then
        ne.content = '\238\132\148'
    else
        ne.content = '\238\132\147'
    end
    ne.eventresponder['mbtn_left_up'] =
        function ()
            if state.fullscreen then
                mp.commandv('cycle', 'fullscreen')
            else
                mp.commandv('cycle', 'window-maximized')
            end
        end
    lo = add_layout('maximize')
    lo.geometry = second_geo
    lo.style = osc_styles.WinCtrl
    lo.alpha[3] = 0
end

--
-- Layouts
--

local layouts = {}

-- Default layout
layouts = function ()

    local osc_geo = {w, h}

	osc_geo.w = osc_param.playresx
	osc_geo.h = 180

    -- origin of the controllers, left/bottom corner
    local posX = 0
    local posY = osc_param.playresy

    osc_param.areas = {} -- delete areas

    -- area for active mouse input
    add_area('input', get_hitbox_coords(posX, posY, 1, osc_geo.w, 113))

    -- area for show/hide
    add_area('showhide', 0, 0, osc_param.playresx, osc_param.playresy)

    -- fetch values
    local osc_w, osc_h=
        osc_geo.w, osc_geo.h

	--
    -- Controller Background
    --
	local lo

	new_element('TransBg', 'box')
	lo = add_layout('TransBg')
	lo.geometry = {x = posX, y = posY, an = 7, w = osc_w, h = 1}
	lo.style = osc_styles.TransBg
	lo.layer = 10
	lo.alpha[3] = 0
	
    --
    -- Alignment
    --
	local refX = osc_w / 2
	local refY = posY
	local geo
	
    --
    -- Seekbar
    --
    new_element('bgbar1', 'box')
    lo = add_layout('bgbar1')
    lo.geometry = {x = refX , y = refY - 105 , an = 5, w = osc_geo.w - 50, h = 4}
    lo.layer = 13
    lo.style = osc_styles.SeekbarBg
    lo.alpha[1] = 128
    lo.alpha[3] = 128

    lo = add_layout('seekbar')
    lo.geometry = {x = refX, y = refY - 105 , an = 5, w = osc_geo.w - 50, h = 20}
	lo.style = osc_styles.SeekbarFg
    lo.slider.gap = 7
    lo.slider.tooltip_style = osc_styles.Tooltip
    lo.slider.tooltip_an = 2

    local showjump = user_opts.showjump
    local offset = showjump and 60 or 0
    
	-- buttons
    lo = add_layout('pl_prev')
    lo.geometry = {x = refX - 120 - offset, y = refY - 40 , an = 5, w = 30, h = 24}
    lo.style = osc_styles.Ctrl2

	lo = add_layout('skipback')
    lo.geometry = {x = refX - 60 - offset, y = refY - 40 , an = 5, w = 30, h = 24}
    lo.style = osc_styles.Ctrl2


    if showjump then
        lo = add_layout('jumpback')
        lo.geometry = {x = refX - 60, y = refY - 40 , an = 5, w = 30, h = 24}
        lo.style = osc_styles.Ctrl2
    end
			
    lo = add_layout('playpause')
    lo.geometry = {x = refX, y = refY - 40 , an = 5, w = 45, h = 45}
    lo.style = osc_styles.Ctrl1	

    if showjump then
        lo = add_layout('jumpfrwd')
        lo.geometry = {x = refX + 60, y = refY - 40 , an = 5, w = 30, h = 24}

        -- HACK: jumpfrwd's icon must be mirrored for nonstandard # of seconds
        -- as the font only has an icon without a number for rewinding
        lo.style = (user_opts.jumpiconnumber and jumpicons[user_opts.jumpamount] ~= nil) and osc_styles.Ctrl2 or osc_styles.Ctrl2Flip
    end

    lo = add_layout('skipfrwd')
    lo.geometry = {x = refX + 60 + offset, y = refY - 40 , an = 5, w = 30, h = 24}
    lo.style = osc_styles.Ctrl2	

    lo = add_layout('pl_next')
    lo.geometry = {x = refX + 120 + offset, y = refY - 40 , an = 5, w = 30, h = 24}
    lo.style = osc_styles.Ctrl2


	-- Time
    lo = add_layout('tc_left')
    lo.geometry = {x = 25, y = refY - 84, an = 7, w = 64, h = 20}
    lo.style = osc_styles.Time	
	

    lo = add_layout('tc_right')
    lo.geometry = {x = osc_geo.w - 25 , y = refY -84, an = 9, w = 64, h = 20}
    lo.style = osc_styles.Time	

    lo = add_layout('cy_audio')
	lo.geometry = {x = 37, y = refY - 40, an = 5, w = 24, h = 24}
    lo.style = osc_styles.Ctrl3	
	
    lo = add_layout('cy_sub')
    lo.geometry = {x = 87, y = refY - 40, an = 5, w = 24, h = 24}
    lo.style = osc_styles.Ctrl3

	lo = add_layout('tog_fs')
    lo.geometry = {x = osc_geo.w - 37, y = refY - 40, an = 5, w = 24, h = 24}
    lo.style = osc_styles.Ctrl3    

	lo = add_layout('tog_info')
    lo.geometry = {x = osc_geo.w - 87, y = refY - 40, an = 5, w = 24, h = 24}
    lo.style = osc_styles.Ctrl3
    
    geo = { x = 25, y = refY - 132, an = 1, w = osc_geo.w - 50, h = 48 }
    lo = add_layout('title')
    lo.geometry = geo
    lo.style = string.format('%s{\\clip(%f,%f,%f,%f)}', osc_styles.Title,
								geo.x, geo.y - geo.h, geo.x + geo.w , geo.y)
	lo.alpha[3] = 0
end

-- Validate string type user options
function validate_user_opts()
    if user_opts.windowcontrols ~= 'auto' and
       user_opts.windowcontrols ~= 'yes' and
       user_opts.windowcontrols ~= 'no' then
        msg.warn('windowcontrols cannot be \'' ..
                user_opts.windowcontrols .. '\'. Ignoring.')
        user_opts.windowcontrols = 'auto'
    end
end

function update_options(list)
    validate_user_opts()
    request_tick()
    visibility_mode(user_opts.visibility, true)
    update_duration_watch()
    request_init()
end

-- OSC INIT
function osc_init()
    msg.debug('osc_init')

    -- set canvas resolution according to display aspect and scaling setting
    local baseResY = 720
    local display_w, display_h, display_aspect = mp.get_osd_size()
    local scale = 1

    if (mp.get_property('video') == 'no') then -- dummy/forced window
        scale = user_opts.scaleforcedwindow
    elseif state.fullscreen then
        scale = user_opts.scalefullscreen
    else
        scale = user_opts.scalewindowed
    end

    if user_opts.vidscale then
        osc_param.unscaled_y = baseResY
    else
        osc_param.unscaled_y = display_h
    end
    osc_param.playresy = osc_param.unscaled_y / scale
    if (display_aspect > 0) then
        osc_param.display_aspect = display_aspect
    end
    osc_param.playresx = osc_param.playresy * osc_param.display_aspect

    -- stop seeking with the slider to prevent skipping files
    state.active_element = nil

    elements = {}

    -- some often needed stuff
    local pl_count = mp.get_property_number('playlist-count', 0)
    local have_pl = (pl_count > 1)
    local pl_pos = mp.get_property_number('playlist-pos', 0) + 1
    local have_ch = (mp.get_property_number('chapters', 0) > 0)
    local loop = mp.get_property('loop-playlist', 'no')

    local ne

    -- playlist buttons
    -- prev
    ne = new_element('pl_prev', 'button')

    ne.content = '\xEF\x8E\xB5'
    ne.enabled = (pl_pos > 1) or (loop ~= 'no')
    ne.eventresponder['mbtn_left_up'] =
        function ()
            mp.commandv('playlist-prev', 'weak')
        end
    ne.eventresponder['mbtn_right_up'] =
        function () show_message(get_playlist()) end

    --next
    ne = new_element('pl_next', 'button')

    ne.content = '\xEF\x8E\xB4'
    ne.enabled = (have_pl and (pl_pos < pl_count)) or (loop ~= 'no')
    ne.eventresponder['mbtn_left_up'] =
        function ()
            mp.commandv('playlist-next', 'weak')
        end
    ne.eventresponder['mbtn_right_up'] =
        function () show_message(get_playlist()) end


    --play control buttons
    --playpause
    ne = new_element('playpause', 'button')

    ne.content = function ()
        if mp.get_property('pause') == 'yes' then
            return ('\xEF\x8E\xAA')
        else
            return ('\xEF\x8E\xA7')
        end
    end
    ne.eventresponder['mbtn_left_up'] =
        function () mp.commandv('cycle', 'pause') end
    --ne.eventresponder['mbtn_right_up'] =
    --    function () mp.commandv('script-binding', 'open-file-dialog') end

    if user_opts.showjump then
        local jumpamount = user_opts.jumpamount
        local jumpmode = user_opts.jumpmode
        local icons = jumpicons.default
        if user_opts.jumpiconnumber then
            icons = jumpicons[jumpamount] or jumpicons.default
        end

        --jumpback
        ne = new_element('jumpback', 'button')

        ne.softrepeat = true
        ne.content = icons[1]
        ne.eventresponder['mbtn_left_down'] =
            --function () mp.command('seek -5') end
            function () mp.commandv('seek', -jumpamount, jumpmode) end
        ne.eventresponder['shift+mbtn_left_down'] =
            function () mp.commandv('frame-back-step') end
        ne.eventresponder['mbtn_right_down'] =
            --function () mp.command('seek -60') end
            function () mp.commandv('seek', -60, jumpmode) end
        ne.eventresponder['enter'] =
            --function () mp.command('seek -5') end
            function () mp.commandv('seek', -jumpamount, jumpmode) end


        --jumpfrwd
        ne = new_element('jumpfrwd', 'button')

        ne.softrepeat = true
        ne.content = icons[2]
        ne.eventresponder['mbtn_left_down'] =
            --function () mp.command('seek +5') end
            function () mp.commandv('seek', jumpamount, jumpmode) end
        ne.eventresponder['shift+mbtn_left_down'] =
            function () mp.commandv('frame-step') end
        ne.eventresponder['mbtn_right_down'] =
            --function () mp.command('seek +60') end
            function () mp.commandv('seek', 60, jumpmode) end
        ne.eventresponder['enter'] =
            --function () mp.command('seek +5') end
            function () mp.commandv('seek', jumpamount, jumpmode) end
    end
    

    --skipback
    ne = new_element('skipback', 'button')

    ne.softrepeat = true
    ne.content = '\xEF\x8E\xA0'
    ne.enabled = (have_ch) -- disables button when no chapters available.
    ne.eventresponder['mbtn_left_down'] =
        --function () mp.command('seek -5') end
        --function () mp.commandv('seek', -5, 'relative', 'keyframes') end
        function () mp.commandv("add", "chapter", -1) end
    --ne.eventresponder['shift+mbtn_left_down'] =
        --function () mp.commandv('frame-back-step') end
    ne.eventresponder['mbtn_right_down'] =
        function () show_message(get_chapterlist()) end
        --function () mp.command('seek -60') end
        --function () mp.commandv('seek', -60, 'relative', 'keyframes') end
    ne.eventresponder['enter'] =
        --function () mp.command('seek -5') end
        --function () mp.commandv('seek', -5, 'relative', 'keyframes') end
        function () mp.commandv("add", "chapter", -1) end

    --skipfrwd
    ne = new_element('skipfrwd', 'button')

    ne.softrepeat = true
    ne.content = '\xEF\x8E\x9F'
    ne.enabled = (have_ch) -- disables button when no chapters available.
    ne.eventresponder['mbtn_left_down'] =
        --function () mp.command('seek +5') end
        --function () mp.commandv('seek', 5, 'relative', 'keyframes') end
        function () mp.commandv("add", "chapter", 1) end
    --ne.eventresponder['shift+mbtn_left_down'] =
        --function () mp.commandv('frame-step') end
    ne.eventresponder['mbtn_right_down'] =
        function () show_message(get_chapterlist()) end
        --function () mp.command('seek +60') end
        --function () mp.commandv('seek', 60, 'relative', 'keyframes') end
    ne.eventresponder['enter'] =
        --function () mp.command('seek +5') end
        --function () mp.commandv('seek', 5, 'relative', 'keyframes') end
        function () mp.commandv("add", "chapter", 1) end

    --
    update_tracklist()
    
    --cy_audio
    ne = new_element('cy_audio', 'button')
    ne.enabled = (#tracks_osc.audio > 0)
    ne.off = (get_track('audio') == 0)
    ne.visible = (osc_param.playresx >= 540)
    ne.content = '\xEF\x8E\xB7'
    ne.tooltip_style = osc_styles.Tooltip
    ne.tooltipF = function ()
		local msg = texts.off
        if not (get_track('audio') == 0) then
            msg = (texts.audio .. ' [' .. get_track('audio') .. ' ∕ ' .. #tracks_osc.audio .. '] ')
            local prop = mp.get_property('current-tracks/audio/title') --('current-tracks/audio/lang')
            if not prop then
				prop = texts.na
			end
			msg = msg .. '[' .. prop .. ']'
			prop = mp.get_property('current-tracks/audio/lang') --('current-tracks/audio/title')
			if prop then
				msg = msg .. ' ' .. prop
			end
			return msg
        end
        return msg
    end
    ne.eventresponder['mbtn_left_up'] =
        function () set_track('audio', 1) end
    ne.eventresponder['mbtn_right_up'] =
        function () set_track('audio', -1) end
    ne.eventresponder['mbtn_mid_up'] =
        function () show_message(get_tracklist('audio')) end
    ne.eventresponder['enter'] =
        function () set_track('audio', 1); show_message(get_tracklist('audio')) end
                
    --cy_sub
    ne = new_element('cy_sub', 'button')
    ne.enabled = (#tracks_osc.sub > 0)
    ne.off = (get_track('sub') == 0)
    ne.visible = (osc_param.playresx >= 600)
    ne.content = '\xEF\x8F\x93'
    ne.tooltip_style = osc_styles.Tooltip
    ne.tooltipF = function ()
		local msg = texts.off
        if not (get_track('sub') == 0) then
            msg = (texts.subtitle .. ' [' .. get_track('sub') .. ' ∕ ' .. #tracks_osc.sub .. '] ')
            local prop = mp.get_property('current-tracks/sub/lang')
            if not prop then
				prop = texts.na
			end
			msg = msg .. '[' .. prop .. ']'
			prop = mp.get_property('current-tracks/sub/title')
			if prop then
				msg = msg .. ' ' .. prop
			end
			return msg
        end
        return msg
    end
    ne.eventresponder['mbtn_left_up'] =
        function () set_track('sub', 1) end
    ne.eventresponder['mbtn_right_up'] =
        function () set_track('sub', -1) end
    ne.eventresponder['mbtn_mid_up'] =
        function () show_message(get_tracklist('sub')) end
    ne.eventresponder['enter'] =
        function () set_track('sub', 1); show_message(get_tracklist('sub')) end
        
    --tog_fs
    ne = new_element('tog_fs', 'button')
    ne.content = function ()
        if (state.fullscreen) then
            return ('\xEF\x85\xAC')
        else
            return ('\xEF\x85\xAD')
        end
    end
    ne.visible = (osc_param.playresx >= 540)
    ne.eventresponder['mbtn_left_up'] =
        function () mp.commandv("cycle", "fullscreen") end

    --tog_info
    ne = new_element('tog_info', 'button')
    ne.content = ''
    ne.visible = (osc_param.playresx >= 600)
    ne.eventresponder['mbtn_left_up'] =
        function () mp.commandv('script-binding', 'stats/display-stats-toggle') end

    -- title
    ne = new_element('title', 'button')
    ne.content = function ()
        local title = state.forced_title or
                      mp.command_native({"expand-text", user_opts.title})
        if state.paused then
			title = title:gsub('\\n', ' '):gsub('\\$', ''):gsub('{','\\{')
		else
			title = title:gsub('\\n', ' '):gsub('\\$', ''):gsub('{','\\{') --title = ' '
		end
        return not (title == '') and title or ' '
    end
    ne.visible = osc_param.playresy >= 320 and user_opts.showtitle
    
    --seekbar
    ne = new_element('seekbar', 'slider')

    ne.enabled = not (mp.get_property('percent-pos') == nil)
    state.slider_element = ne.enabled and ne or nil  -- used for forced_title
    ne.slider.markerF = function ()
        local duration = mp.get_property_number('duration', nil)
        if not (duration == nil) then
            local chapters = mp.get_property_native('chapter-list', {})
            local markers = {}
            for n = 1, #chapters do
                markers[n] = (chapters[n].time / duration * 100)
            end
            return markers
        else
            return {}
        end
    end
    ne.slider.posF =
        function () return mp.get_property_number('percent-pos', nil) end
    ne.slider.tooltipF = function (pos)
        local duration = mp.get_property_number('duration', nil)
        if not ((duration == nil) or (pos == nil)) then
            possec = duration * (pos / 100)
            return mp.format_time(possec)
        else
            return ''
        end
    end
    ne.slider.seekRangesF = function()
        if not user_opts.seekrange then
            return nil
        end
        local cache_state = state.cache_state
        if not cache_state then
            return nil
        end
        local duration = mp.get_property_number('duration', nil)
        if (duration == nil) or duration <= 0 then
            return nil
        end
        local ranges = cache_state['seekable-ranges']
        if #ranges == 0 then
            return nil
        end
        local nranges = {}
        for _, range in pairs(ranges) do
            nranges[#nranges + 1] = {
                ['start'] = 100 * range['start'] / duration,
                ['end'] = 100 * range['end'] / duration,
            }
        end
        return nranges
    end
    ne.eventresponder['mouse_move'] = --keyframe seeking when mouse is dragged
        function (element)
			if not element.state.mbtnleft then return end -- allow drag for mbtnleft only!
            -- mouse move events may pile up during seeking and may still get
            -- sent when the user is done seeking, so we need to throw away
            -- identical seeks
            local seekto = get_slider_value(element)
            if (element.state.lastseek == nil) or
                (not (element.state.lastseek == seekto)) then
                    local flags = 'absolute-percent'
                    if not user_opts.seekbarkeyframes then
                        flags = flags .. '+exact'
                    end
                    mp.commandv('seek', seekto, flags)
                    element.state.lastseek = seekto
            end

        end
    ne.eventresponder['mbtn_left_down'] = --exact seeks on single clicks
        function (element)
			mp.commandv('seek', get_slider_value(element), 'absolute-percent', 'exact')
			element.state.mbtnleft = true
		end
	ne.eventresponder['mbtn_left_up'] =
		function (element) element.state.mbtnleft = false end
    ne.eventresponder['mbtn_right_down'] = --seeks to chapter start
        function (element)
			local duration = mp.get_property_number('duration', nil)
			if not (duration == nil) then
				local chapters = mp.get_property_native('chapter-list', {})
				if #chapters > 0 then
					local pos = get_slider_value(element)
					local ch = #chapters
					for n = 1, ch do
						if chapters[n].time / duration * 100 >= pos then
							ch = n - 1
							break
						end
					end
					mp.commandv('set', 'chapter', ch - 1)
					--if chapters[ch].title then show_message(chapters[ch].time) end
				end
			end
		end
    ne.eventresponder['reset'] =
        function (element) element.state.lastseek = nil end


    -- tc_left (current pos)
    ne = new_element('tc_left', 'button')
    ne.content = function ()
	if (state.fulltime) then
		return (mp.get_property_osd('playback-time/full'))
	else
		return (mp.get_property_osd('playback-time'))
	end
    end
    ne.eventresponder["mbtn_left_up"] = function ()
        state.fulltime = not state.fulltime
        request_init()
    end
    -- tc_right (total/remaining time)
    ne = new_element('tc_right', 'button')
    ne.content = function ()
        if (mp.get_property_number('duration', 0) <= 0) then return '--:--:--' end
        if (state.rightTC_trem) then
		if (state.fulltime) then
			return ('-'..mp.get_property_osd('playtime-remaining/full'))
		else
			return ('-'..mp.get_property_osd('playtime-remaining'))
		end
        else
		if (state.fulltime) then
			return (mp.get_property_osd('duration/full'))
		else
			return (mp.get_property_osd('duration'))
		end
			
        end
    end
    ne.eventresponder['mbtn_left_up'] =
        function () state.rightTC_trem = not state.rightTC_trem end

    -- load layout
    layouts()

    -- load window controls
    if window_controls_enabled() then
        window_controls()
    end

    --do something with the elements
    prepare_elements()
end

function shutdown()
    
end

--
-- Other important stuff
--


function show_osc()
    -- show when disabled can happen (e.g. mouse_move) due to async/delayed unbinding
    if not state.enabled then return end

    msg.trace('show_osc')
    --remember last time of invocation (mouse move)
    state.showtime = mp.get_time()

    osc_visible(true)
    
    if user_opts.keyboardnavigation == true then
        osc_enable_key_bindings()
    end

    if (user_opts.fadeduration > 0) then
        state.anitype = nil
    end
end

function hide_osc()
    msg.trace('hide_osc')
    if not state.enabled then
        -- typically hide happens at render() from tick(), but now tick() is
        -- no-op and won't render again to remove the osc, so do that manually.
        state.osc_visible = false
        render_wipe()
        if user_opts.keyboardnavigation == true then
            osc_disable_key_bindings()
        end
    elseif (user_opts.fadeduration > 0) then
        if not(state.osc_visible == false) then
            state.anitype = 'out'
            request_tick()
        end
    else
        osc_visible(false)
    end
end

function osc_visible(visible)
    if state.osc_visible ~= visible then
        state.osc_visible = visible
    end
    request_tick()
end

function pause_state(name, enabled)
    state.paused = enabled
    mp.add_timeout(0.1, function() state.osd:update() end) 
    if user_opts.showonpause then
		if enabled then
			state.lastvisibility = user_opts.visibility
			visibility_mode("always", true)
			show_osc()
		else
			visibility_mode(state.lastvisibility, true)
		end
	end
    request_tick()
end

function cache_state(name, st)
    state.cache_state = st
    request_tick()
end

-- Request that tick() is called (which typically re-renders the OSC).
-- The tick is then either executed immediately, or rate-limited if it was
-- called a small time ago.
function request_tick()
    if state.tick_timer == nil then
        state.tick_timer = mp.add_timeout(0, tick)
    end

    if not state.tick_timer:is_enabled() then
        local now = mp.get_time()
        local timeout = tick_delay - (now - state.tick_last_time)
        if timeout < 0 then
            timeout = 0
        end
        state.tick_timer.timeout = timeout
        state.tick_timer:resume()
    end
end

function mouse_leave()
    if get_hidetimeout() >= 0 then
        hide_osc()
    end
    -- reset mouse position
    state.last_mouseX, state.last_mouseY = nil, nil
    state.mouse_in_window = false
end

function request_init()
    state.initREQ = true
    request_tick()
end

-- Like request_init(), but also request an immediate update
function request_init_resize()
    request_init()
    -- ensure immediate update
    state.tick_timer:kill()
    state.tick_timer.timeout = 0
    state.tick_timer:resume()
end

function render_wipe()
    msg.trace('render_wipe()')
    state.osd:remove()
end

function render()
    msg.trace('rendering')
    local current_screen_sizeX, current_screen_sizeY, aspect = mp.get_osd_size()
    local mouseX, mouseY = get_virt_mouse_pos()
    local now = mp.get_time()

    -- check if display changed, if so request reinit
    if not (state.mp_screen_sizeX == current_screen_sizeX
        and state.mp_screen_sizeY == current_screen_sizeY) then

        request_init_resize()

        state.mp_screen_sizeX = current_screen_sizeX
        state.mp_screen_sizeY = current_screen_sizeY
    end

    -- init management
    if state.initREQ then
        osc_init()
        state.initREQ = false

        -- store initial mouse position
        if (state.last_mouseX == nil or state.last_mouseY == nil)
            and not (mouseX == nil or mouseY == nil) then

            state.last_mouseX, state.last_mouseY = mouseX, mouseY
        end
    end


    -- fade animation
    if not(state.anitype == nil) then

        if (state.anistart == nil) then
            state.anistart = now
        end

        if (now < state.anistart + (user_opts.fadeduration/1000)) then

            if (state.anitype == 'in') then --fade in
                osc_visible(true)
                state.animation = scale_value(state.anistart,
                    (state.anistart + (user_opts.fadeduration/1000)),
                    255, 0, now)
            elseif (state.anitype == 'out') then --fade out
                state.animation = scale_value(state.anistart,
                    (state.anistart + (user_opts.fadeduration/1000)),
                    0, 255, now)
            end

        else
            if (state.anitype == 'out') then
                osc_visible(false)
            end
            state.anistart = nil
            state.animation = nil
            state.anitype =  nil
        end
    else
        state.anistart = nil
        state.animation = nil
        state.anitype =  nil
    end

    --mouse show/hide area
    for k,cords in pairs(osc_param.areas['showhide']) do
        set_virt_mouse_area(cords.x1, cords.y1, cords.x2, cords.y2, 'showhide')
    end
    if osc_param.areas['showhide_wc'] then
        for k,cords in pairs(osc_param.areas['showhide_wc']) do
            set_virt_mouse_area(cords.x1, cords.y1, cords.x2, cords.y2, 'showhide_wc')
        end
    else
        set_virt_mouse_area(0, 0, 0, 0, 'showhide_wc')
    end
    do_enable_keybindings()

    --mouse input area
    local mouse_over_osc = false

    for _,cords in ipairs(osc_param.areas['input']) do
        if state.osc_visible then -- activate only when OSC is actually visible
            set_virt_mouse_area(cords.x1, cords.y1, cords.x2, cords.y2, 'input')
        end
        if state.osc_visible ~= state.input_enabled then
            if state.osc_visible then
                mp.enable_key_bindings('input')
            else
                mp.disable_key_bindings('input')
            end
            state.input_enabled = state.osc_visible
        end

        if (mouse_hit_coords(cords.x1, cords.y1, cords.x2, cords.y2)) then
            mouse_over_osc = true
        end
    end

    if osc_param.areas['window-controls'] then
        for _,cords in ipairs(osc_param.areas['window-controls']) do
            if state.osc_visible then -- activate only when OSC is actually visible
                set_virt_mouse_area(cords.x1, cords.y1, cords.x2, cords.y2, 'window-controls')
                mp.enable_key_bindings('window-controls')
            else
                mp.disable_key_bindings('window-controls')
            end

            if (mouse_hit_coords(cords.x1, cords.y1, cords.x2, cords.y2)) then
                mouse_over_osc = true
            end
        end
    end

    if osc_param.areas['window-controls-title'] then
        for _,cords in ipairs(osc_param.areas['window-controls-title']) do
            if (mouse_hit_coords(cords.x1, cords.y1, cords.x2, cords.y2)) then
                mouse_over_osc = true
            end
        end
    end

    -- autohide
    if not (state.showtime == nil) and (get_hidetimeout() >= 0) then
        local timeout = state.showtime + (get_hidetimeout()/1000) - now
        if timeout <= 0 then
            if (state.active_element == nil) and not (mouse_over_osc) then
                hide_osc()
            end
        else
            -- the timer is only used to recheck the state and to possibly run
            -- the code above again
            if not state.hide_timer then
                state.hide_timer = mp.add_timeout(0, tick)
            end
            state.hide_timer.timeout = timeout
            -- re-arm
            state.hide_timer:kill()
            state.hide_timer:resume()
        end
    end


    -- actual rendering
    local ass = assdraw.ass_new()

    -- Messages
    render_message(ass)

    -- actual OSC
    if state.osc_visible then
        render_elements(ass)
    end

    -- submit
    set_osd(osc_param.playresy * osc_param.display_aspect,
            osc_param.playresy, ass.text)
end

--
-- Eventhandling
--

local function element_has_action(element, action)
    return element and element.eventresponder and
        element.eventresponder[action]
end

function process_event(source, what)
    local action = string.format('%s%s', source,
        what and ('_' .. what) or '')

    if what == 'down' or what == 'press' then

        for n = 1, #elements do

            if mouse_hit(elements[n]) and
                elements[n].eventresponder and
                (elements[n].eventresponder[source .. '_up'] or
                    elements[n].eventresponder[action]) then

                if what == 'down' then
                    state.active_element = n
                    state.active_event_source = source
                end
                -- fire the down or press event if the element has one
                if element_has_action(elements[n], action) then
                    elements[n].eventresponder[action](elements[n])
                end

            end
        end

    elseif what == 'up' then

        if elements[state.active_element] then
            local n = state.active_element

            if n == 0 then
                --click on background (does not work)
            elseif element_has_action(elements[n], action) and
                mouse_hit(elements[n]) then

                elements[n].eventresponder[action](elements[n])
            end

            --reset active element
            if element_has_action(elements[n], 'reset') then
                elements[n].eventresponder['reset'](elements[n])
            end

        end
        state.active_element = nil
        state.mouse_down_counter = 0

    elseif source == 'mouse_move' then

        state.mouse_in_window = true

        local mouseX, mouseY = get_virt_mouse_pos()
        if (user_opts.minmousemove == 0) or
            (not ((state.last_mouseX == nil) or (state.last_mouseY == nil)) and
                ((math.abs(mouseX - state.last_mouseX) >= user_opts.minmousemove)
                    or (math.abs(mouseY - state.last_mouseY) >= user_opts.minmousemove)
                )
            ) then
            show_osc()
        end
        state.last_mouseX, state.last_mouseY = mouseX, mouseY

        local n = state.active_element
        if element_has_action(elements[n], action) then
            elements[n].eventresponder[action](elements[n])
        end
        request_tick()
    end
end

function show_logo()
	local osd_w, osd_h = 640, 360
	local logo_x, logo_y = osd_w/2, osd_h/2-20
	local ass = assdraw.ass_new()
	ass:new_event()
	ass:pos(logo_x, logo_y)
	ass:append('{\\1c&H8E348D&\\3c&H0&\\3a&H60&\\blur1\\bord0.5}')
	ass:draw_start()
	ass_draw_cir_cw(ass, 0, 0, 100)
	ass:draw_stop()
	
	ass:new_event()
	ass:pos(logo_x, logo_y)
	ass:append('{\\1c&H632462&\\bord0}')
	ass:draw_start()
	ass_draw_cir_cw(ass, 6, -6, 75)
	ass:draw_stop()

	ass:new_event()
	ass:pos(logo_x, logo_y)
	ass:append('{\\1c&HFFFFFF&\\bord0}')
	ass:draw_start()
	ass_draw_cir_cw(ass, -4, 4, 50)
	ass:draw_stop()
		
	ass:new_event()
	ass:pos(logo_x, logo_y)
	ass:append('{\\1c&H632462&\\bord&}')
	ass:draw_start()
	ass:move_to(-20, -20)
	ass:line_to(23.3, 5)
	ass:line_to(-20, 30)
	ass:draw_stop()
	
	ass:new_event()
	ass:pos(logo_x, logo_y+110)
	ass:an(8)
	ass:append(texts.welcome)
	set_osd(osd_w, osd_h, ass.text)
end

-- called by mpv on every frame
function tick()
    if (not state.enabled) then return end

    if (state.idle) then
		--show_logo()
        -- render idle message
        msg.trace('idle message')

        if state.showhide_enabled then
            mp.disable_key_bindings('showhide')
            mp.disable_key_bindings('showhide_wc')
            state.showhide_enabled = false
        end


    elseif (state.fullscreen and user_opts.showfullscreen)
        or (not state.fullscreen and user_opts.showwindowed) then

        -- render the OSC
        render()
    else
        -- Flush OSD
        set_osd(osc_param.playresy, osc_param.playresy, '')
    end

    state.tick_last_time = mp.get_time()

    if state.anitype ~= nil then
        -- state.anistart can be nil - animation should now start, or it can
        -- be a timestamp when it started. state.idle has no animation.
        if not state.idle and
           (not state.anistart or
            mp.get_time() < 1 + state.anistart + user_opts.fadeduration/1000)
        then
            -- animating or starting, or still within 1s past the deadline
            request_tick()
        else
            kill_animation()
        end
    end
end

function do_enable_keybindings()
    if state.enabled then
        if not state.showhide_enabled then
            mp.enable_key_bindings('showhide', 'allow-vo-dragging+allow-hide-cursor')
            mp.enable_key_bindings('showhide_wc', 'allow-vo-dragging+allow-hide-cursor')
        end
        state.showhide_enabled = true
    end
end

function enable_osc(enable)
    state.enabled = enable
    if enable then
        do_enable_keybindings()
    else
        hide_osc() -- acts immediately when state.enabled == false
        if state.showhide_enabled then
            mp.disable_key_bindings('showhide')
            mp.disable_key_bindings('showhide_wc')
        end
        state.showhide_enabled = false
    end
end

-- duration is observed for the sole purpose of updating chapter markers
-- positions. live streams with chapters are very rare, and the update is also
-- expensive (with request_init), so it's only observed when we have chapters
-- and the user didn't disable the livemarkers option (update_duration_watch).
function on_duration() request_init() end

local duration_watched = false
function update_duration_watch()
    local want_watch = user_opts.livemarkers and
                       (mp.get_property_number("chapters", 0) or 0) > 0 and
                       true or false  -- ensure it's a boolean

    if (want_watch ~= duration_watched) then
        if want_watch then
            mp.observe_property("duration", nil, on_duration)
        else
            mp.unobserve_property(on_duration)
        end
        duration_watched = want_watch
    end
end

validate_user_opts()
update_duration_watch()

mp.register_event('shutdown', shutdown)
mp.register_event('start-file', request_init)
mp.observe_property('track-list', nil, request_init)
mp.observe_property('playlist', nil, request_init)
mp.observe_property("chapter-list", "native", function(_, list)
    list = list or {}  -- safety, shouldn't return nil
    table.sort(list, function(a, b) return a.time < b.time end)
    state.chapter_list = list
    update_duration_watch()
    request_init()
end)

mp.register_script_message('osc-message', show_message)
mp.register_script_message('osc-chapterlist', function(dur)
    show_message(get_chapterlist(), dur)
end)
mp.register_script_message('osc-playlist', function(dur)
    show_message(get_playlist(), dur)
end)
mp.register_script_message('osc-tracklist', function(dur)
    local msg = {}
    for k,v in pairs(nicetypes) do
        table.insert(msg, get_tracklist(k))
    end
    show_message(table.concat(msg, '\n\n'), dur)
end)

mp.observe_property('fullscreen', 'bool',
    function(name, val)
        state.fullscreen = val
        request_init_resize()
    end
)
mp.observe_property('border', 'bool',
    function(name, val)
        state.border = val
        request_init_resize()
    end
)
mp.observe_property('window-maximized', 'bool',
    function(name, val)
        state.maximized = val
        request_init_resize()
    end
)
mp.observe_property('idle-active', 'bool',
    function(name, val)
        state.idle = val
        request_tick()
    end
)
mp.observe_property('pause', 'bool', pause_state)
mp.observe_property('demuxer-cache-state', 'native', cache_state)
mp.observe_property('vo-configured', 'bool', function(name, val)
    request_tick()
end)
mp.observe_property('playback-time', 'number', function(name, val)
    request_tick()
end)
mp.observe_property('osd-dimensions', 'native', function(name, val)
    -- (we could use the value instead of re-querying it all the time, but then
    --  we might have to worry about property update ordering)
    request_init_resize()
end)

-- mouse show/hide bindings
mp.set_key_bindings({
    {'mouse_move',              function(e) process_event('mouse_move', nil) end},
    {'mouse_leave',             mouse_leave},
}, 'showhide', 'force')
mp.set_key_bindings({
    {'mouse_move',              function(e) process_event('mouse_move', nil) end},
    {'mouse_leave',             mouse_leave},
}, 'showhide_wc', 'force')
do_enable_keybindings()

--mouse input bindings
mp.set_key_bindings({
    {"mbtn_left",           function(e) process_event("mbtn_left", "up") end,
                            function(e) process_event("mbtn_left", "down")  end},
    {"shift+mbtn_left",     function(e) process_event("shift+mbtn_left", "up") end,
                            function(e) process_event("shift+mbtn_left", "down")  end},
    {"mbtn_right",          function(e) process_event("mbtn_right", "up") end,
                            function(e) process_event("mbtn_right", "down")  end},
    -- alias to shift_mbtn_left for single-handed mouse use
    {"mbtn_mid",            function(e) process_event("shift+mbtn_left", "up") end,
                            function(e) process_event("shift+mbtn_left", "down")  end},
    {"wheel_up",            function(e) process_event("wheel_up", "press") end},
    {"wheel_down",          function(e) process_event("wheel_down", "press") end},
    {"mbtn_left_dbl",       "ignore"},
    {"shift+mbtn_left_dbl", "ignore"},
    {"mbtn_right_dbl",      "ignore"},
}, "input", "force")
mp.enable_key_bindings('input')

mp.set_key_bindings({
    {'mbtn_left',           function(e) process_event('mbtn_left', 'up') end,
                            function(e) process_event('mbtn_left', 'down')  end},
}, 'window-controls', 'force')
mp.enable_key_bindings('window-controls')

function get_hidetimeout()
    if user_opts.visibility == 'always' then
        return -1 -- disable autohide
    end
    return user_opts.hidetimeout
end

function always_on(val)
    if state.enabled then
        if val then
            show_osc()
        else
            hide_osc()
        end
    end
end

-- mode can be auto/always/never/cycle
-- the modes only affect internal variables and not stored on its own.
function visibility_mode(mode, no_osd)
    if mode == 'auto' then
        always_on(false)
        enable_osc(true)
    elseif mode == 'always' then
        enable_osc(true)
        always_on(true)
    elseif mode == 'never' then
        enable_osc(false)
    else
        msg.warn('Ignoring unknown visibility mode \"' .. mode .. '\"')
        return
    end
    
	user_opts.visibility = mode
	
    if not no_osd and tonumber(mp.get_property('osd-level')) >= 1 then
        mp.osd_message('OSC visibility: ' .. mode)
    end

    -- Reset the input state on a mode change. The input state will be
    -- recalcuated on the next render cycle, except in 'never' mode where it
    -- will just stay disabled.
    mp.disable_key_bindings('input')
    mp.disable_key_bindings('window-controls')
    state.input_enabled = false
    request_tick()
end


-- KeyboardControl
--

local osc_key_bindings = {}

function osc_kb_control_up()
    visibility_mode('always', true)
    local keyboard_controls = build_keyboard_controls()
    local rows = {}
    local active_row_index = 0
    local active_row_name = nil

    local row_index = -1
    for row_name, row_controls in pairs(keyboard_controls) do
        row_index = row_index + 1
        rows[row_index] = row_name
        for i, control in pairs(row_controls) do
            if control == state.highlight_element then
                active_row_index = row_index
                active_row_name = row_name
            end
        end
    end

    if active_row_index - 1 < 0 then
        return
    end

    local next_row_index = active_row_index - 1

    local new_active_row_name = rows[next_row_index]
    local new_active_row = keyboard_controls[new_active_row_name]

    for i, control in pairs(new_active_row) do
        state.highlight_element = control
        return
    end
end

function osc_kb_control_down()
    visibility_mode('always', true)
    local keyboard_controls = build_keyboard_controls()
    local rows = {}
    local active_row_index = 0
    local active_row_name = nil

    local row_index = -1
    for row_name, row_controls in pairs(keyboard_controls) do
        row_index = row_index + 1
        rows[row_index] = row_name
        for i, control in pairs(row_controls) do
            if control == state.highlight_element then
                active_row_index = row_index
                active_row_name = row_name
            end
        end
    end

    if active_row_index + 1 > #rows then
        return
    end

    local next_row_index = active_row_index + 1

    local new_active_row_name = rows[next_row_index]
    local new_active_row = keyboard_controls[new_active_row_name]

    for i, control in pairs(new_active_row) do
        state.highlight_element = control
        return
    end

end

function osc_kb_control_left()
    visibility_mode('always', true)
    local keyboard_controls = build_keyboard_controls()
    
    local active_control_name = nil
    for row_name, row_controls in pairs(keyboard_controls) do
        local controls = {}
        local controls_index = -1
        for i, control in pairs(row_controls) do
            controls_index = controls_index + 1
            controls[controls_index] = control
            if control == state.highlight_element then
                active_control_index = controls_index
                active_control_name = control
            end
        end

        if active_control_name == 'seekbar' then
            mp.commandv('seek', -5, 'exact', 'keyframes')
            return
        end

        if active_control_name then
            if active_control_index - 1 < 0 then
                return
            end
        
            local next_control_index = active_control_index - 1
            state.highlight_element = controls[next_control_index]
            return
        end
    end

end

function osc_kb_control_right()
    visibility_mode('always', true)
    local keyboard_controls = build_keyboard_controls()
    
    local active_control_name = nil
    for row_name, row_controls in pairs(keyboard_controls) do
        local controls = {}
        local controls_index = -1
        for i, control in pairs(row_controls) do
            controls_index = controls_index + 1
            controls[controls_index] = control
            if control == state.highlight_element then
                active_control_index = controls_index
                active_control_name = control
            end
        end

        if active_control_name == 'seekbar' then
            mp.commandv('seek', 5, 'exact', 'keyframes')
            return
        end

        if active_control_name then
            if active_control_index + 1 > #controls then
                return
            end
        
            local next_control_index = active_control_index + 1
            state.highlight_element = controls[next_control_index]
            return
        end
    end

end

function osc_kb_control_back()
    visibility_mode('auto', true)
end

function osc_kb_control_enter()
    visibility_mode('always', true)
    for n = 1, #elements do
        if elements[n].name == state.highlight_element then
            
            local action = 'enter'
            if element_has_action(elements[n], action) then
                elements[n].eventresponder[action](elements[n])
                return
            end

            local action = 'mbtn_left_up'
            if element_has_action(elements[n], action) then
                elements[n].eventresponder[action](elements[n])
                return
            end
        end
    end

end

function osc_add_key_binding(key, name, fn, flags)
	osc_key_bindings[#osc_key_bindings + 1] = name
	mp.add_forced_key_binding(key, name, fn, flags)
end

-- This is based on code from https://github.com/darsain/uosc
function osc_enable_key_bindings()
	osc_key_bindings = {}
	-- The `mp.set_key_bindings()` method would be easier here, but that
	-- doesn't support 'repeatable' flag, so we are stuck with this monster.
	osc_add_key_binding('up',              'osc-kb-control-prev1',        osc_kb_control_up, 'repeatable')
	osc_add_key_binding('down',            'osc-kb-control-next1',        osc_kb_control_down, 'repeatable')
	osc_add_key_binding('left',            'osc-kb-control-left1',        osc_kb_control_left, 'repeatable')
	osc_add_key_binding('right',           'osc-kb-control-right1',      osc_kb_control_right, 'repeatable')
	osc_add_key_binding('enter',      'osc-kb-control-select-alt3', osc_kb_control_enter, 'repeatable')
	osc_add_key_binding('esc',        'osc-kb-control-close',       osc_kb_control_back, 'repeatable')
end

function osc_disable_key_bindings()
	for _, name in ipairs(osc_key_bindings) do mp.remove_key_binding(name) end
	osc_key_bindings = {}
end



visibility_mode(user_opts.visibility, true)
mp.register_script_message('osc-visibility', visibility_mode)
mp.add_key_binding(nil, 'visibility', function() visibility_mode('cycle') end)

set_virt_mouse_area(0, 0, 0, 0, 'input')
set_virt_mouse_area(0, 0, 0, 0, 'window-controls')