-- YataiDON-HSS override of PyTaikoGreen/background/bg_objects/donbg/4.lua
-- ROUND 12: the cabinet's band is a single static 1920x276 plate (see base.lua),
-- so for the DEFAULT donbg pack every index is the base class (draw_layers).
--
-- ROUND 60 (r60-collab-fix-all): but DonBG4 is ALSO the class funassyi's
-- COLLAB band uses (DonBG4.new(1, player_num, "background/collab/funassyi")),
-- and the plain `return base` alias silently dropped the parent DonBG4's
-- overlay row (the funassyi flag banners, donbg/0_1/overlay, anim 2 bob) on
-- top of the collab path's tile scroll.  This override restores the parent's
-- DonBG4 shape on top of the ROUND 60 base contract: for the default pack the
-- base's draw_layers path still runs (animal/buttoburst, name "4_1", DATA
-- table), for a collab path draw_textures below adds the overlay row.
local DonBGBase = require("background/bg_objects/donbg/base")

DonBG4 = setmetatable({}, { __index = DonBGBase })
DonBG4.__index = DonBG4

function DonBG4.new(index, player_num, path)
    local self = setmetatable({}, DonBG4)
    local base = DonBGBase.new(index, player_num, path)
    for k, v in pairs(base) do self[k] = v end
    self.overlay_move = tex.get_animation(2)
    self.overlay_texture = tex.get_texture_info(self.name, "overlay")
    self._id_overlay = tex.get_id(self.name, "overlay")  -- nil = missing (ROUND 60: id 0 is valid)
    return self
end

function DonBG4:update(current_time_ms)
    DonBGBase.update(self, current_time_ms)
    if self.overlay_move then self.overlay_move:update(current_time_ms) end
end

function DonBG4:draw_textures(fade, y, frame)
    local w = self.bg_texture and self.bg_texture.x2[1] or 0
    local ow = self.overlay_texture and self.overlay_texture.x2[1] or 0
    local mv = self.move and self.move.attribute or 0
    local omv = self.overlay_move and self.overlay_move.attribute or 0
    for i = 0, 4 do
        if self._id_bg then
            tex.draw_texture(self._id_bg, {
                frame = frame,
                fade = fade,
                x = (i * w) + mv,
                y = y
            })
        end
        -- parent DonBG4 geometry: banner row scrolls with the tiles and bobs
        -- on anim 2.  (The ghost trails this draw showed mid-round were the
        -- id-0 bug -- see base.lua: the tile row was being skipped, so the
        -- band was never repainted and every moving sprite smeared.  With the
        -- tiles painting again, the moving overlay is covered every frame.)
        if self._id_overlay and self.overlay_texture then
            tex.draw_texture(self._id_overlay, {
                frame = frame,
                fade = fade,
                x = (i * ow) + mv,
                y = omv + y
            })
        end
    end
end

return DonBG4