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/kumamon"
local MAX_DANCERS     = 5

-- BGFever: sunburst backdrop with the prefecture map and local produce
local KumamonBGFever   = {}
KumamonBGFever.__index = KumamonBGFever

function KumamonBGFever.new()
    local self = setmetatable({}, KumamonBGFever)
    self.name = "bg_fever_0"
    tex.load_folder(COLLAB_PATH, "bg_fever/" .. self.name)

    -- sunburst rays flicker between two frames every half-second, matching
    -- the source movie's 60-frame flicker cycle
    self.ray_flicker = anim.texture_change(1000, { { 0, 500, 0 }, { 500, 1000, 1 } }, { loop = true })
    self.ray_flicker:start()

    -- produce icon strip scrolls right and wraps around (source uses a long
    -- single-image cycle -- a position tween, not a frame-swap animation)
    self.produce_texture = tex.get_texture_info(self.name, "produce")
    self.produce_move = anim.move(8000, { total_distance = self.produce_texture.width, loop = true })
    self.produce_move:start()

    self._id_bg      = tex.get_texture(COLLAB_PATH .. "/" .. self.name .. "/" .. "background") or 0
    self._id_rays    = tex.get_texture(COLLAB_PATH .. "/" .. self.name .. "/" .. "rays") or 0
    self._id_map     = tex.get_texture(COLLAB_PATH .. "/" .. self.name .. "/" .. "map") or 0
    self._id_produce = tex.get_texture(COLLAB_PATH .. "/" .. self.name .. "/" .. "produce") or 0
    return self
end

function KumamonBGFever:start() end

function KumamonBGFever:update(current_time_ms)
    self.ray_flicker:update(current_time_ms)
    self.produce_move:update(current_time_ms)
end

function KumamonBGFever:draw()
    tex.draw_texture(self._id_bg)
    tex.draw_texture(self._id_rays, { frame = self.ray_flicker.attribute })
    tex.draw_texture(self._id_map)
    local pw = self.produce_texture.width
    local x = -self.produce_move.attribute % pw
    tex.draw_texture(self._id_produce, { x = x - pw })
    tex.draw_texture(self._id_produce, { x = x })
end

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

-- Background

local KumamonBackground = {}
KumamonBackground.__index = KumamonBackground

function KumamonBackground.new(player_num, bpm)
    local self          = setmetatable({}, KumamonBackground)
    self.donbg          = DonBG4.new(1, player_num, COLLAB_PATH)
    self.bg_normal      = BGNormal.Base.new(0, COLLAB_PATH)
    self.bg_fever       = KumamonBGFever.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

    tex.load_folder(COLLAB_PATH, "dodai")
    self._id_dodai = tex.get_texture(COLLAB_PATH .. "/" .. "dodai" .. "/" .. "dodai") or 0

    return self
end

function KumamonBackground:update(current_ms, bpm)
    self.donbg:update(current_ms)
    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 KumamonBackground:handle_good(player_num) self.chibi:add_chibi(player_num, false) end

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

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

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

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

function KumamonBackground: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 KumamonBackground:draw_back()
    if self.is_clear then
        self.bg_fever:draw()
    else
        self.bg_normal:draw()
    end
    tex.draw_texture(self._id_dodai)
    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 KumamonBackground:draw_fore() end

function KumamonBackground: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()
    tex.unload_folder(COLLAB_PATH, "dodai")
end

return KumamonBackground