DonBGBase = {}
DonBGBase.__index = DonBGBase

function DonBGBase.new(index, player_num, path)
    local self = setmetatable({}, DonBGBase)

    self.name = string.format("%d_%d", index - 1, player_num)
    self.path = path
    tex.load_folder(path, string.format("donbg/%s", self.name))
    self.bg_texture = tex.get_texture_info(self.name, "background")

    self.move = anim.move(3000, {
        total_distance = -self.bg_texture.width,
        loop = true
    })
    self.move:start()

    self.is_clear = false
    self.clear_fade = tex.get_animation(1)

    self._id_bg = tex.get_id(self.name, "background") or 0

    return self
end

function DonBGBase:set_clear(is_clear)
    if is_clear and not self.is_clear then
        self.is_clear = true
        self.clear_fade:start()
    end
    if not is_clear and self.is_clear then
        self.is_clear = false
        self.clear_fade:reset()
    end
end

function DonBGBase:update(current_time_ms)
    self.move:update(current_time_ms)
    self.clear_fade:update(current_time_ms)
end

function DonBGBase:draw_textures(fade, y, frame)
    for i = 0, 4 do
        tex.draw_texture(self._id_bg, {
            frame = frame,
            fade = fade,
            x = (i * self.bg_texture.width) + self.move.attribute,
            y = y
        })
    end
end

function DonBGBase:draw(y)
    y = y or 0
    self:draw_textures(1.0, y, 0)

    if self.is_clear then
        self:draw_textures(self.clear_fade.attribute, y, 1)
    end
end

function DonBGBase:destroy()
    tex.unload_folder(self.path, string.format("donbg/%s", self.name))
end

return DonBGBase