#warning-ignore-all:shadowed_variable
#warning-ignore-all:unused_argument
const STRUCT := preload('res://scripts/struct.gd')
const GRAPHICS := preload('res://scripts/loaders/snes/graphics.gd')

class TileSNESMode7 extends STRUCT.StructType:
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		return GRAPHICS.mode7_to_tile(buffer.get_data(64))

class TileSNESMode7c extends STRUCT.StructType:
	# Note that this will give a palette offset of 0, you will need to postprocess the values.
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		return GRAPHICS.mode7_compressed_to_tile(buffer.get_data(32)[1])

class TileSNES4bpp extends STRUCT.StructType:
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		return GRAPHICS._4plane_to_tile(buffer.get_data(32)[1])

class TileSNES3bpp extends STRUCT.StructType:
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		return GRAPHICS._3plane_to_tile(buffer.get_data(24)[1])

class TileSNES2bpp extends STRUCT.StructType:
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		return GRAPHICS._2plane_to_tile(buffer.get_data(16)[1])

class TileSNES1bpp extends STRUCT.StructType:
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		return GRAPHICS._1plane_to_tile(buffer.get_data(8)[1])

class SNESTritile extends STRUCT.StructType:  # Not TileSNESTritile as these are 16x12 not 8x8
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		return GRAPHICS.get_tritile(buffer)

class ColorBGR555 extends STRUCT.StructType:
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		return GRAPHICS.bgr555_to_color(buffer.get_u16())

class PaletteOf555 extends STRUCT.StructType:
	var length: int = 16
	func _init(length: int):
		self.length = length
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		var array := PoolColorArray()
		for i in self.length:
			array.append(GRAPHICS.bgr555_to_color(buffer.get_u16()))
		return array

class ItemCost extends STRUCT.StructType:
	func get_value(buffer: StreamPeer, leftover_bits: Array):
		var b0 := buffer.get_u8()
		var mantissa := buffer.get_u8()
		var exponent := b0 & 0x3F
		var is_sellable := (b0 & 0x80) == 0
		var is_sellprice_5gil := (b0 & 0x40) == 0x40
		var buy_price := mantissa * int(pow(10, exponent))
		var sell_price := -1 if not is_sellable else (5 if is_sellprice_5gil else buy_price/2)
		return {'buy_price': buy_price, 'sell_price': sell_price}

# Unions aren't covered by my DSL yet
class EquipStatBonus extends STRUCT.StructType:
	static func get_stat_bonuses(affected_stats: int, bonus: int, base: int = 0) -> Dictionary:
		var stats := {Common.STAT_STR: base, Common.STAT_SPD: base, Common.STAT_VIT: base, Common.STAT_MAG: base}
		if affected_stats & 0x1:
			stats[Common.STAT_MAG] += bonus
		if affected_stats & 0x2:
			stats[Common.STAT_VIT] += bonus
		if affected_stats & 0x4:
			stats[Common.STAT_SPD] += bonus
		if affected_stats & 0x8:
			stats[Common.STAT_STR] += bonus
		return stats

	func get_value(buffer: StreamPeer, leftover_bits: Array):
		var b0 := buffer.get_u8()
		var is_stat_bonus = b0 >> 7
		if is_stat_bonus:
			var affected_stats := (b0 >> 3) & 0x0F  # "0" maryoku, "1": tairyoku, "2": subayasa, "3": chikara
			var stats := [{}, {}]
			var bonus := b0 & 0x07
			match bonus:
				0:
					return get_stat_bonuses(affected_stats, 1)
				1:
					return get_stat_bonuses(affected_stats, 2)
				2:
					return get_stat_bonuses(affected_stats, 3)
				3: # unused? "+1/-1/+1/-1"
					return {Common.STAT_STR: 1, Common.STAT_SPD: -1, Common.STAT_VIT: 1, Common.STAT_MAG: -1}
				4: # unused? "-1 (to unselected stats)"
					return get_stat_bonuses(affected_stats, 1, -1)
				5: # Giant's Glove: +5 -5 +5 -5
					return {Common.STAT_STR: 5, Common.STAT_SPD: -5, Common.STAT_VIT: 5, Common.STAT_MAG: -5}
				6: # Bone Mail: -5 to unselected stats
					return get_stat_bonuses(affected_stats, 5, -5)
				7:
					return get_stat_bonuses(affected_stats, 5)
		else:  # is Element bitfield
			return {'elemental_bonus': b0 & 0x7F}

static func get_structtypes() -> Dictionary:
	return {
		'TileSNESMode7': TileSNESMode7.new(),
		'TileSNESMode7c': TileSNESMode7c.new(),
		'TileSNES4bpp': TileSNES4bpp.new(),
		'TileSNES3bpp': TileSNES3bpp.new(),
		'TileSNES2bpp': TileSNES2bpp.new(),
		'TileSNES1bpp': TileSNES1bpp.new(),
		'SNESTritile': SNESTritile.new(),
		'ColorBGR555': ColorBGR555.new(),
		'Palette16Of555': PaletteOf555.new(16),
		'Palette128Of555': PaletteOf555.new(128),
		'ItemCost': ItemCost.new(),
		'EquipStatBonus': EquipStatBonus.new(),
	}