#include "../../include/mgui/list.h"
#include "../../include/alloc.h"
#include <mgl/mgl.h>
#include <assert.h>

mgui_list* mgui_list_create(mgui_list_direction direction) {
    mgui_list *list = mgui_alloc(sizeof(mgui_list));    
    mgui_widget_init(&list->widget, MGUI_WIDGET_LIST);
    list->direction = direction;
    list->position = (mgl_vec2i){ 0, 0 };
    list->items = NULL;
    list->num_items = 0;
    list->items_capacity = 0;
    return list;
}

mgui_widget* mgui_list_to_widget(mgui_list *list) {
    return &list->widget;
}

mgui_list* mgui_widget_to_list(mgui_widget *widget) {
    assert(widget->type == MGUI_WIDGET_LIST);
    return (mgui_list*)widget;
}

void mgui_list_set_position(mgui_list *self, mgl_vec2i position) {
    self->position = position;
}

static void mgui_list_ensure_capacity(mgui_list *self, size_t new_capacity) {
    if(self->items_capacity >= new_capacity)
        return;

    size_t capacity = self->items_capacity;
    if(capacity == 0)
        capacity = 8;

    while(capacity < new_capacity) {
        capacity = capacity + (capacity >> 1); /* capacity *= 1.5 */
    }

    self->items = mgui_realloc(self->items, capacity);
    self->items_capacity = capacity;
}

void mgui_list_append(mgui_list *self, mgui_widget *widget) {
    mgui_list_ensure_capacity(self, (self->num_items + 1) * sizeof(mgui_widget*));
    self->items[self->num_items] = widget;
    ++self->num_items;
}

void mgui_list_on_event(mgui_list *self, mgl_window *window, mgl_event *event) {
    for(size_t i = 0; i < self->num_items; ++i) {
        mgui_widget_on_event(self->items[i], window, event);
    }
}

void mgui_list_draw(mgui_list *self, mgl_window *window) {
    mgl_context *context = mgl_get_context();
    context->gl.glTranslatef(self->position.x, self->position.y, 0.0f);
    for(size_t i = 0; i < self->num_items; ++i) {
        mgui_widget_draw(self->items[i], window);
    }
    context->gl.glLoadIdentity(); /* TODO: Remove, but what about glRotatef above */
}