ClearAnimation = {}
ClearAnimation.__index = ClearAnimation

function ClearAnimation.new(is_2p)
    local self = setmetatable({}, ClearAnimation)

    self.is_2p = is_2p
    self.idx = is_2p and 1 or 0
    self.draw_clear_full = false
    self.name = "in"
    self.frame = 0

    self.bachio_fade_in         = tex.get_animation(46, "game")
    self.bachio_texture_change  = tex.get_animation(47, "game")
    self.bachio_out             = tex.get_animation(55, "game")
    self.bachio_move_out        = tex.get_animation(66, "game")
    self.clear_highlight_fade_in = tex.get_animation(56, "game")

    self.bachio_fade_in:start()
    self.bachio_texture_change:start()
    self.bachio_out:start()
    self.bachio_move_out:start()
    self.clear_highlight_fade_in:start()

    self.clear_separate_fade_in = {}
    self.clear_separate_stretch = {}
    for i = 0, 4 do
        local fade = anim.fade(100, { initial_opacity = 0.0, final_opacity = 1.0, delay = i * 50 })
        fade:start()
        self.clear_separate_fade_in[i + 1] = fade

        local stretch = anim.text_stretch(200, { delay = i * 50 })
        stretch:start()
        self.clear_separate_stretch[i + 1] = stretch
    end

    audio.play_sound("clear", "sound")

    self.t_clear           = tex.get_texture("game/ending_anim/clear")
    self.t_clear_separated = tex.get_texture("game/ending_anim/clear_separated")
    self.t_clear_highlight = tex.get_texture("game/ending_anim/clear_highlight")
    self.t_bachio_l_in     = tex.get_texture("game/ending_anim/bachio_l_in")
    self.t_bachio_l_out    = tex.get_texture("game/ending_anim/bachio_l_out")
    self.t_bachio_r_in     = tex.get_texture("game/ending_anim/bachio_r_in")
    self.t_bachio_r_out    = tex.get_texture("game/ending_anim/bachio_r_out")

    local spacing = tex.get_skin_config("clear_animation_x_spacing")
    self.clear_anim_x_spacing = (spacing and spacing.x) or 0

    return self
end

function ClearAnimation:update(current_ms)
    self.bachio_fade_in:update(current_ms)
    self.bachio_texture_change:update(current_ms)
    self.bachio_out:update(current_ms)
    self.bachio_move_out:update(current_ms)
    self.clear_highlight_fade_in:update(current_ms)

    if self.clear_highlight_fade_in.is_finished or self.clear_highlight_fade_in.attribute >= 1.0 then
        self.draw_clear_full = true
    end

    for i = 1, 5 do
        self.clear_separate_fade_in[i]:update(current_ms)
        self.clear_separate_stretch[i]:update(current_ms)
    end

    if self.bachio_texture_change.is_finished then
        self.name = "out"
        self.frame = math.floor(self.bachio_out.attribute)
    else
        self.frame = math.floor(self.bachio_texture_change.attribute)
    end
end

function ClearAnimation:draw()
    if self.draw_clear_full then
        tex.draw_texture(self.t_clear, { index = self.idx })
    else
        for i = 5, 1, -1 do
            local j = i - 1
            tex.draw_texture(self.t_clear_separated, {
                frame = j,
                x = j * self.clear_anim_x_spacing,
                y = -self.clear_separate_stretch[i].attribute,
                y2 = self.clear_separate_stretch[i].attribute,
                fade = self.clear_separate_fade_in[i].attribute,
                index = self.idx,
            })
        end
    end

    tex.draw_texture(self.t_clear_highlight, {
        fade = self.clear_highlight_fade_in.attribute,
        index = self.idx,
    })

    local ltex = (self.name == "in") and self.t_bachio_l_in or self.t_bachio_l_out
    local rtex = (self.name == "in") and self.t_bachio_r_in or self.t_bachio_r_out

    tex.draw_texture(ltex, {
        frame = self.frame,
        x = -self.bachio_move_out.attribute,
        fade = self.bachio_fade_in.attribute,
        index = self.idx,
    })
    tex.draw_texture(rtex, {
        frame = self.frame,
        x = self.bachio_move_out.attribute,
        fade = self.bachio_fade_in.attribute,
        index = self.idx,
    })
end