class_name ActionFormat


## Byte Length: 2 [br]
## AC
var signature: String = "AC"

## Byte Type: u8 [br]
## Byte Length: 2
var version: Version

## Byte Type: u16 [br]
## Byte Length: 2
var action_count: int

## Byte Type: u8 [br]
## Byte Length: 10
var reserved: PackedByteArray

## Length: [member action_count]
var actions: Array[ActionData]

## Byte Type: u32 [br]
## Byte Length: 4
var event_count: int

## Length: [member event_count]
var events: Array[Event]

## Byte Type: f32 [br]
## Byte Length: [member action_count] [br]
## The times are given in the unit of "ticks per displayed frame". [br]
## Multiply by 24 to get the time in milliseconds.
var frame_times: Array[float]


func get_byte_length() -> int:
		var length := 20
		
		for action in actions:
			length += action.get_byte_length()
			
		length += Event.BYTE_LENGTH * event_count
		length += 4 * action_count
		
		return length


static func from_bytes(bytes: ByteStream) -> ActionFormat:
	var action_format = ActionFormat.new()
	
	bytes.advance(action_format.signature.length())
	
	@warning_ignore("shadowed_variable")
	var version = Version.new()
	version.minor = bytes.decode_u8()
	version.major = bytes.decode_u8()
	action_format.version = version
	
	if version.major < 2 and version.minor < 3:
		print(version)
		return action_format
	
	action_format.action_count = bytes.decode_u16()
	action_format.reserved = bytes.get_buffer(10).bytes
	
	action_format.actions = [] as Array[ActionData]
	for idx in action_format.action_count:
		var action = ActionData.from_bytes(bytes, version)
		action_format.actions.append(action)
	
	action_format.event_count = bytes.decode_u32()
	action_format.events = [] as Array[Event]
	for idx in action_format.event_count:
		var event = Event.from_bytes(bytes, version)
		action_format.events.append(event)
	
	action_format.frame_times = [] as Array[float]
	for idx in action_format.action_count:
		action_format.frame_times.append(bytes.decode_float())
	
	return action_format


class ActionData:
	## Byte Type: u32 [br]
	## Byte Length: 4
	var motion_count: int
	
	## Length: [member motion_count]
	var motions: Array[Motion]
	
	
	func get_byte_length() -> int:
		var length := 4
		for motion in motions:
			length += motion.get_byte_length()
		
		return length
	
	
	static func from_bytes(bytes: ByteStream, version: Version) -> ActionData:
		var action = ActionData.new()
		
		action.motion_count = bytes.decode_u32()
		action.motions = [] as Array[Motion]
		for idx in action.motion_count:
			var motion = Motion.from_bytes(bytes, version)
			action.motions.append(motion)
		
		return action


class Motion:
	## Byte Type: u8 [br]
	## Byte Length: 32
	var unused: PackedByteArray
	
	## Byte Type: u32 [br]
	## Byte Length: 4
	var sprite_layer_count: int

	## Length: [member sprite_layer_count]
	var sprite_layers: Array[SpriteLayer]
	
	## Byte Type: i32 [br]
	## Byte Length: 4
	var event_id: int
	
	## Byte Type: u32 [br]
	## Byte Length: 4
	var sprite_anchor_count: int
	
	## Length: [member sprite_anchor_count]
	var sprite_anchors: Array[SpriteAnchor]
	
	
	func get_byte_length() -> int:
		return 44 + SpriteLayer.BYTE_LENGTH * sprite_layer_count + SpriteAnchor.BYTE_LENGTH * sprite_anchor_count
	
	
	static func from_bytes(bytes: ByteStream, version: Version):
		var motion = Motion.new()
		
		motion.unused = bytes.get_buffer(32).bytes
		
		motion.sprite_layer_count = bytes.decode_u32()
		motion.sprite_layers = [] as Array[SpriteLayer]
		for idx in motion.sprite_layer_count:
			var sprite_layer = SpriteLayer.from_bytes(bytes, version)
			motion.sprite_layers.append(sprite_layer)
		
		motion.event_id = bytes.decode_s32()
		
		motion.sprite_anchor_count = bytes.decode_u32()
		motion.sprite_anchors = [] as Array[SpriteAnchor]
		for idx in motion.sprite_anchor_count:
			var sprite_anchor = SpriteAnchor.from_bytes(bytes, version)
			motion.sprite_anchors.append(sprite_anchor)
		
		return motion


class SpriteLayer:
	const BYTE_LENGTH := 44
	
	## Byte Type: i32 [br]
	## Byte Length: 4
	var position_u: int
	
	## Byte Type: i32 [br]
	## Byte Length: 4
	var position_v: int
	
	## Byte Type: i32 [br]
	## Byte Length: 4
	var sprite_index: int
	
	## Byte Type: u32 [br]
	## Byte Length: 4
	var flip_h: int
	
	## Byte Type: u8 [br]
	## Byte Length: 1
	var color_r: int
	
	## Byte Type: u8 [br]
	## Byte Length: 1
	var color_g: int
	
	## Byte Type: u8 [br]
	## Byte Length: 1
	var color_b: int
	
	## Byte Type: u8 [br]
	## Byte Length: 1
	var color_a: int
	
	## Byte Type: f32 [br]
	## Byte Length: 4
	## Versions: [2.3, 2.4]
	var scale: float
	
	## Byte Type: f32 [br]
	## Byte Length: 4
	## Versions: [2.5]
	var scale_u: float
	
	## Byte Type: f32 [br]
	## Byte Length: 4
	## Versions: [2.5]
	var scale_v: float
	
	## Byte Type: i32 [br]
	## Byte Length: 4
	var rotation_degrees: int
	
	## Byte Type: u32 [br]
	## Byte Length: 4
	var type: int
	
	## Byte Type: u32 [br]
	## Byte Length: 4
	var width: int
	
	## Byte Type: u32 [br]
	## Byte Length: 4
	var height: int
	
	
	func get_position() -> Vector2:
		return Vector2(position_u, position_v)
	
	
	func get_color() -> Color:
		return Color8(color_r, color_g, color_b, color_a)
	
	
	func get_scale() -> Vector2:
		if scale:
			return Vector2(scale, scale)
		else:
			return Vector2(scale_u, scale_v)
	
	
	func get_size() -> Vector2:
		if width and height:
			return Vector2(width, height)
		else:
			return Vector2.ZERO
	
	
	static func from_bytes(bytes: ByteStream, version: Version):
		var sprite_layer = SpriteLayer.new()
		
		sprite_layer.position_u = bytes.decode_s32()
		sprite_layer.position_v = bytes.decode_s32()
		sprite_layer.sprite_index = bytes.decode_s32()
		sprite_layer.flip_h = bytes.decode_u32()
		sprite_layer.color_r = bytes.decode_u8()
		sprite_layer.color_g = bytes.decode_u8()
		sprite_layer.color_b = bytes.decode_u8()
		sprite_layer.color_a = bytes.decode_u8()
		
		if version.major == 2 and version.minor >= 4:
			sprite_layer.scale_u = bytes.decode_float()
			sprite_layer.scale_v = bytes.decode_float()
		else:
			sprite_layer.scale = bytes.decode_float()
		
		sprite_layer.rotation_degrees = bytes.decode_s32()
		sprite_layer.type = bytes.decode_u32()
		
		if version.to_string() == "2.5":
			sprite_layer.width = bytes.decode_u32()
			sprite_layer.height = bytes.decode_u32()
		
		return sprite_layer


class SpriteAnchor:
	const BYTE_LENGTH := 16
	
	## Byte Type: u8 [br]
	## Byte Length: 4
	var unused: PackedByteArray
	
	## Byte Type: i32 [br]
	## Byte Length: 4
	var position_u: int
	
	## Byte Type: i32 [br]
	## Byte Length: 4
	var position_v: int
	
	## Byte Type: u32 [br]
	## Byte Length: 4
	var flag: int
	
	
	func get_position() -> Vector2:
		return Vector2(position_u, position_v)
	
	
	static func from_bytes(bytes: ByteStream, _version: Version):
		var sprite_anchor = SpriteAnchor.new()
		
		sprite_anchor.unused = bytes.get_buffer(4).bytes
		sprite_anchor.position_u = bytes.decode_s32()
		sprite_anchor.position_v = bytes.decode_s32()
		sprite_anchor.flag = bytes.decode_u32()
		
		return sprite_anchor


class Event:
	const BYTE_LENGTH := 40
	
	## Byte Type: u8 [br]
	## Byte Length: 40
	var name: String
	
	
	static func from_bytes(bytes: ByteStream, _version: Version):
		var event = Event.new()
		
		event.name = bytes.get_string_from_utf8(BYTE_LENGTH)
		
		return event