local DonBG6          = require("background/bg_objects/donbg/6")
local Fever           = require("background/bg_objects/fever")
local Footer          = require("background/bg_objects/footer")
local Dancer          = require("background/bg_objects/dancer")
local RendaController = require("background/bg_objects/renda")
local ChibiController = require("background/bg_objects/chibi")

local COLLAB_PATH     = "background/collab/gumi"
local MAX_DANCERS     = 5

local GumiDonBG = setmetatable({}, { __index = DonBG6 })
GumiDonBG.__index = GumiDonBG

function GumiDonBG.new(index, player_num, path)
    local self = setmetatable({}, GumiDonBG)
    local base = DonBG6.new(index, player_num, path)
    for k, v in pairs(base) do self[k] = v end
    return self
end

function GumiDonBG: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
    for i = 0, 5, 2 do
        tex.draw_texture(self._id_overlay_1, {
            frame = frame,
            fade = fade,
            x = (i * self.overlay_1_texture.width) + self.move.attribute * 3,
            y = y
        })
    end
    for i = 0, 4 do
        tex.draw_texture(self._id_overlay_2, {
            frame = frame,
            fade = fade,
            x = (i * self.overlay_2_texture.width) + self.move.attribute,
            y = self.overlay_move.attribute + y
        })
    end
end

local GumiBGNormal   = {}
GumiBGNormal.__index = GumiBGNormal

function GumiBGNormal.new()
    local self = setmetatable({}, GumiBGNormal)
    self.name = "bg_0"
    tex.load_folder(COLLAB_PATH, "bg_normal/" .. self.name)
    local bg_info = tex.get_texture_info(self.name, "background")
    local frames = (bg_info and bg_info.frame_count) or 1
    local textures = {}
    for i = 0, frames - 1 do
        table.insert(textures, { i * 500, (i + 1) * 500, i })
    end
    self.letter_cycle = anim.texture_change(frames * 500, textures, { loop = true })
    self.letter_cycle:start()
    self._id_bg = tex.get_texture(COLLAB_PATH .. "/" .. self.name .. "/" .. "background") or 0
    return self
end

function GumiBGNormal:update(current_time_ms) self.letter_cycle:update(current_time_ms) end

function GumiBGNormal:draw()
    tex.draw_texture(self._id_bg, { frame = self.letter_cycle.attribute })
end

function GumiBGNormal:destroy() tex.unload_folder(COLLAB_PATH, "bg_normal/" .. self.name) end

local GumiBGFever   = {}
GumiBGFever.__index = GumiBGFever

function GumiBGFever.new()
    local self = setmetatable({}, GumiBGFever)
    self.name = "bg_fever_0"
    tex.load_folder(COLLAB_PATH, "bg_fever/" .. self.name)
    self.transitioned = false
    self._id_bg = tex.get_texture(COLLAB_PATH .. "/" .. self.name .. "/" .. "background") or 0
    return self
end

function GumiBGFever:start() end
function GumiBGFever:update(current_time_ms) end
function GumiBGFever:draw() tex.draw_texture(self._id_bg) end
function GumiBGFever:destroy() tex.unload_folder(COLLAB_PATH, "bg_fever/" .. self.name) end

-- Background

local GumiBackground = {}
GumiBackground.__index = GumiBackground

function GumiBackground.new(player_num, bpm)
    local self          = setmetatable({}, GumiBackground)
    self.donbg          = GumiDonBG.new(1, player_num, COLLAB_PATH)
    self.bg_normal      = GumiBGNormal.new()
    self.bg_fever       = GumiBGFever.new()
    self.footer         = Footer.new(COLLAB_PATH, -1)
    self.fever          = Fever.create(0, bpm, COLLAB_PATH)
    self.dancer         = Dancer.BaseDancerGroup.new(0, bpm, MAX_DANCERS, COLLAB_PATH)
    for i, d in ipairs(self.dancer.dancers) do
        if d.index == 4 then
            self.dancer.dancers[i], self.dancer.dancers[1] = self.dancer.dancers[1], self.dancer.dancers[i]
            break
        end
    end
    self.renda          = RendaController.new(COLLAB_PATH, 0)
    self.chibi          = ChibiController.new(bpm, COLLAB_PATH, 1)
    self.is_clear       = false
    self.is_rainbow     = false
    self.last_milestone = 1
    return self
end

function GumiBackground:update(current_ms, bpm)
    self.donbg:update(current_ms)
    self.bg_normal:update(current_ms)
    self.fever:update(current_ms, bpm)
    self.dancer:update(current_ms, bpm)
    self.renda:update(current_ms)
    self.chibi:update(current_ms, bpm)
end

function GumiBackground:handle_good(player_num) self.chibi:add_chibi(player_num, false) end

function GumiBackground:handle_ok(player_num) self.chibi:add_chibi(player_num, false) end

function GumiBackground:handle_bad(player_num) self.chibi:add_chibi(player_num, true) end

function GumiBackground:handle_drumroll(player_num) self.renda:add_renda() end

function GumiBackground:handle_balloon(player_num) self.renda:add_renda() end

function GumiBackground:handle_gauge(player_num, progress, is_clear, is_rainbow)
    self.donbg:set_clear(is_clear)
    if is_rainbow and not self.is_rainbow then self.fever:start() end
    self.is_clear   = is_clear
    self.is_rainbow = is_rainbow

    local current_milestone
    if is_clear then
        current_milestone = MAX_DANCERS
    else
        current_milestone = math.min(MAX_DANCERS - 1, math.floor(progress * MAX_DANCERS))
    end
    if current_milestone > self.last_milestone then
        for _ = 1, current_milestone - self.last_milestone do self.dancer:add_dancer() end
        self.last_milestone = current_milestone
    elseif current_milestone < self.last_milestone then
        for _ = 1, self.last_milestone - current_milestone do self.dancer:remove_dancer() end
        self.last_milestone = current_milestone
    end
end

function GumiBackground:draw_back()
    if self.is_clear then
        self.bg_fever:draw()
    else
        self.bg_normal:draw()
    end
    self.donbg:draw()
    self.renda:draw()
    self.dancer:draw()
    self.footer:draw()
    if self.is_rainbow then self.fever:draw() end
    self.chibi:draw()
end

function GumiBackground:draw_fore() end

function GumiBackground:destroy()
    self.donbg:destroy()
    self.bg_normal:destroy()
    self.bg_fever:destroy()
    self.fever:destroy()
    self.dancer:destroy()
    self.footer:destroy()
    self.renda:destroy()
    self.chibi:destroy()
end

return GumiBackground