#include "../include/ContextMenu.hpp"
#include "../include/ColorScheme.hpp"
#include "../include/ResourceCache.hpp"
#include "../include/Settings.hpp"
#include <SFML/Graphics/Text.hpp>
#include <SFML/Graphics/RectangleShape.hpp>
#include <cmath>
#include <cassert>

namespace dchat
{
    const float PADDING_SIDE = 10.0f;
    const float MENU_ITEM_FONT_SIZE = 18.0f;
    const std::string MENU_FONT_PATH = "fonts/Nunito-Regular.ttf";
    
    ContextMenuItem::ContextMenuItem(const std::string & _text, MenuItemClickCallbackFunc _clickCallbackFunc) : 
        text(sf::String::fromUtf8(_text.begin(), _text.end()), *ResourceCache::getFont(MENU_FONT_PATH), MENU_ITEM_FONT_SIZE * Settings::getScaling()),
        clickCallbackFunc(_clickCallbackFunc)
    {
        text.setFillColor(ColorScheme::getContextMenuTextColor());
    }
    
    ContextMenu::ContextMenu() : 
        focusedItem(-1),
        pressedItem(-1),
        visible(true)
    {
        
    }

    void ContextMenu::addItem(const ContextMenuItem &item)
    {
        menuItems.push_back(item);
    }
    
    void ContextMenu::setPosition(const sf::Vector2f &position)
    {
        this->position = position;
    }
    
    void ContextMenu::setVisible(bool visible)
    {
        this->visible = visible;
    }
    
    ContextMenuItem& ContextMenu::getItemByIndex(usize index)
    {
        assert(index < menuItems.size());
        return menuItems[index];
    }
        
    void ContextMenu::processEvent(const sf::Event &event)
    {
        if(!visible || menuItems.empty()) return;
        
        if(event.type == sf::Event::MouseButtonPressed)
        {
            if(event.mouseButton.button == sf::Mouse::Button::Left)
            {
                pressedItem = focusedItem;
                if(pressedItem == -1)
                    setVisible(false);
            }
            else
            {
                focusedItem = -1;
                pressedItem = -1;
                setVisible(false);
            }
        }
        else if(event.type == sf::Event::MouseButtonReleased)
        {
            if(pressedItem != -1 && pressedItem == focusedItem)
            {
                assert(pressedItem < menuItems.size());
                if(menuItems[pressedItem].clickCallbackFunc)
                    menuItems[pressedItem].clickCallbackFunc(&menuItems[pressedItem]);
                setVisible(false);
            }
            pressedItem = -1;
        }
    }
    
    void ContextMenu::draw(sf::RenderWindow &window)
    {
        if(!visible || menuItems.empty()) return;
        
        const sf::Font *menuItemFont = ResourceCache::getFont(MENU_FONT_PATH);
        float boxHeight = menuItemFont->getLineSpacing(MENU_ITEM_FONT_SIZE) * 1.5f;
        
        sf::Vector2f menuSize;
        for(ContextMenuItem &menuItem : menuItems)
        {
            menuItem.text.setCharacterSize(18 * Settings::getScaling());
            menuSize.x = std::max(menuSize.x, menuItem.text.getLocalBounds().width);
            menuSize.y += boxHeight;
        }
        menuSize.x += PADDING_SIDE * 2.0f;
        menuSize.x = floor(menuSize.x);
        menuSize.y = floor(menuSize.y);
        
        sf::Vector2f pos(floor(position.x), floor(position.y));
        sf::RectangleShape background(menuSize);
        background.setPosition(pos);
        background.setFillColor(ColorScheme::getContextMenuBackgroundColor());
        window.draw(background);
        
        auto mousePos = sf::Mouse::getPosition(window);
        
        focusedItem = -1;
        for(int i = 0; i < menuItems.size(); ++i)
        {
            ContextMenuItem &menuItem = menuItems[i];
            if(mousePos.x >= pos.x && mousePos.x <= pos.x + menuSize.x && mousePos.y >= pos.y && mousePos.y <= pos.y + boxHeight && (pressedItem == -1 || i == pressedItem))
            {
                sf::RectangleShape selectedItemRect(sf::Vector2f(menuSize.x, floor(boxHeight)));
                selectedItemRect.setFillColor(ColorScheme::getContextMenuSelectedItemBackgroundColor());
                selectedItemRect.setPosition(floor(pos.x), floor(pos.y));
                window.draw(selectedItemRect);
                focusedItem = i;
            }
            
            menuItem.text.setPosition(floor(pos.x + PADDING_SIDE), floor(pos.y + boxHeight * 0.5f - menuItemFont->getLineSpacing(MENU_ITEM_FONT_SIZE) * 0.5f));
            window.draw(menuItem.text);
            pos.y += boxHeight;
        }
    }
}