local DonBG4          = require("background/bg_objects/donbg/4")
local BGNormal        = require("background/bg_objects/bg_normal")
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/yokai"
local MAX_DANCERS     = 5

local YokaiDonBG = setmetatable({}, { __index = DonBG4 })
YokaiDonBG.__index = YokaiDonBG

function YokaiDonBG.new(index, player_num, path)
    local self = setmetatable({}, YokaiDonBG)
    local base = DonBG4.new(index, player_num, path)
    for k, v in pairs(base) do self[k] = v end
    return self
end

function YokaiDonBG: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, 7 do
        tex.draw_texture(self._id_overlay, {
            frame = frame,
            fade = fade,
            x = (i * self.overlay_texture.width) + self.move.attribute,
            y = self.overlay_move.attribute + y
        })
    end
end

local YokaiBGFever   = {}
YokaiBGFever.__index = YokaiBGFever

local FIREWORK_FRAMES   = 16
local FIREWORK_DURATION = 1280

local function build_firework_change()
    local frame_time = FIREWORK_DURATION / FIREWORK_FRAMES
    local frames = {}
    for i = 0, FIREWORK_FRAMES - 1 do
        table.insert(frames, { i * frame_time, (i + 1) * frame_time, i })
    end
    return anim.texture_change(FIREWORK_DURATION, frames)
end

function YokaiBGFever.new()
    local self = setmetatable({}, YokaiBGFever)
    self.name = "bg_fever_0"
    tex.load_folder(COLLAB_PATH, "bg_fever/" .. self.name)
    self._id_bg          = tex.get_texture(COLLAB_PATH .. "/" .. self.name .. "/" .. "background") or 0
    self.firework_texture = tex.get_texture_info(self.name, "firework")
    self._id_firework     = tex.get_texture(COLLAB_PATH .. "/" .. self.name .. "/" .. "firework") or 0
    self:spawn_firework()
    return self
end

function YokaiBGFever:spawn_firework()
    local screen_width  = tex.get_screen_width()
    local screen_height = tex.get_screen_height()
    self.firework_x = math.random(0, math.max(0, screen_width - self.firework_texture.width))
    self.firework_y = math.random(360, math.max(360, screen_height - self.firework_texture.height))
    self.firework_change = build_firework_change()
    self.firework_change:start()
end

function YokaiBGFever:start() end

function YokaiBGFever:update(current_time_ms)
    self.firework_change:update(current_time_ms)
    if self.firework_change.is_finished then
        self:spawn_firework()
    end
end

function YokaiBGFever:draw()
    tex.draw_texture(self._id_bg)
    tex.draw_texture(self._id_firework, {
        frame = self.firework_change.attribute,
        x = self.firework_x,
        y = self.firework_y,
        blend = "additive"
    })
end

function YokaiBGFever:destroy() tex.unload_folder(COLLAB_PATH, "bg_fever/" .. self.name) end

-- Background

local YokaiBackground = {}
YokaiBackground.__index = YokaiBackground

function YokaiBackground.new(player_num, bpm)
    local self          = setmetatable({}, YokaiBackground)
    self.donbg          = YokaiDonBG.new(1, player_num, COLLAB_PATH)
    self.bg_normal      = BGNormal.Base.new(0, COLLAB_PATH)
    self.bg_fever       = YokaiBGFever.new()
    self.footer         = Footer.new(COLLAB_PATH, 0)
    self.fever          = Fever.create(0, bpm, COLLAB_PATH)
    self.dancer         = Dancer.BaseDancerGroup.new(0, bpm, MAX_DANCERS, COLLAB_PATH)
    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 YokaiBackground:update(current_ms, bpm)
    self.donbg:update(current_ms, bpm)
    self.bg_fever: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 YokaiBackground:handle_good(player_num) self.chibi:add_chibi(player_num, false) end

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

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

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

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

function YokaiBackground: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
    if not is_rainbow and self.is_rainbow then self.fever:stop() 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 YokaiBackground:draw_back()
    if self.is_clear then
        self.bg_fever:draw()
    else
        self.bg_normal:draw()
    end
    self.footer:draw()
    self.donbg:draw()
    self.renda:draw()
    self.dancer:draw()
    self.fever:draw()
    self.chibi:draw()
end

function YokaiBackground:draw_fore() end

function YokaiBackground: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 YokaiBackground