#extends Object
extends Node

#class_name Note

enum {NOTE_TAP, NOTE_HOLD, NOTE_SLIDE, NOTE_ARROW, NOTE_TOUCH, NOTE_TOUCH_HOLD}
enum SlideType {CHORD, ARC_CW, ARC_ACW}
const DEATH_DELAY := 0.45

class NoteBase:
	var time_hit: float
	var time_death: float
	var column: int
	var double_hit := false

class NoteSlide extends NoteBase:
	var type := NOTE_SLIDE
	var time_release: float
	var duration: float
	var column_release: int
	var slide_type: int
	var slide_id: int
	var values: Dictionary

	func _init(time_hit: float, duration: float, column: int, column_release: int, slide_type: int):
		self.time_hit = time_hit
		self.duration = duration
		self.time_release = time_hit + duration
		self.time_death = time_release + DEATH_DELAY
		self.column = column
		self.column_release = column_release
		self.slide_type = slide_type
		self.values = {}
		update_slide_variables()

	func update_slide_variables():
		match slide_type:
			Note.SlideType.CHORD:
				values.start = theme.RADIAL_UNIT_VECTORS[column] * theme.receptor_ring_radius
				values.end = theme.RADIAL_UNIT_VECTORS[column_release] * theme.receptor_ring_radius
				values.angle = (values.end - values.start).angle()
			Note.SlideType.ARC_CW:
				values.start_a = theme.RADIAL_COL_ANGLES[column]
				values.end_a = theme.RADIAL_COL_ANGLES[column_release]
				if values.end_a < values.start_a:
					values.end_a += TAU
			Note.SlideType.ARC_ACW:
				values.start_a = theme.RADIAL_COL_ANGLES[column]
				values.end_a = theme.RADIAL_COL_ANGLES[column_release]
				if values.end_a > values.start_a:
					values.end_a -= TAU

	func get_position(progress: float) -> Vector2:
		match slide_type:
			Note.SlideType.CHORD:
				return lerp(values.start, values.end, progress)
			Note.SlideType.ARC_CW:
				var circle_angle : float = lerp(values.start_a, values.end_a, progress)
				return polar2cartesian(theme.receptor_ring_radius, circle_angle)
			Note.SlideType.ARC_ACW:
				var circle_angle : float = lerp(values.start_a, values.end_a, progress)
				return polar2cartesian(theme.receptor_ring_radius, circle_angle)

	func get_angle(progress: float) -> float:
		match slide_type:
			Note.SlideType.CHORD:
				return values.angle
			Note.SlideType.ARC_CW:
				var circle_angle : float = lerp(values.start_a, values.end_a, progress)
				return circle_angle + PI/2.0
			Note.SlideType.ARC_ACW:
				var circle_angle : float = lerp(values.start_a, values.end_a, progress)
				return circle_angle - PI/2.0

	func get_slide_length() -> float:
		# Return unit-circle (r=1) length of slide trail
		match slide_type:
			Note.SlideType.CHORD:
				return 2*abs(sin((theme.RADIAL_COL_ANGLES[column_release] - theme.RADIAL_COL_ANGLES[column])/2))
			Note.SlideType.ARC_CW:
				return fposmod(theme.RADIAL_COL_ANGLES[column_release] - theme.RADIAL_COL_ANGLES[column], TAU)
			Note.SlideType.ARC_ACW:
				return fposmod(theme.RADIAL_COL_ANGLES[column] - theme.RADIAL_COL_ANGLES[column_release], TAU)



static func make_tap(time_hit: float, column: int) -> Dictionary:
	return {type=NOTE_TAP, time_hit=time_hit, time_death=time_hit+DEATH_DELAY, column=column, double_hit=false}

static func make_break(time_hit: float, column: int) -> Dictionary:
	return {type=NOTE_TAP, time_hit=time_hit, time_death=time_hit+DEATH_DELAY, column=column, double_hit=false}

static func make_hold(time_hit: float, duration: float, column: int) -> Dictionary:
	var time_release := time_hit + duration
	return {type=NOTE_HOLD, time_hit=time_hit, time_release=time_release, time_death=time_release+DEATH_DELAY, column=column, double_hit=false}

static func make_slide(time_hit: float, duration: float, column: int, column_release: int, slide_type:=SlideType.CHORD) -> NoteSlide:
#	var time_release := time_hit + duration
#	return {type=NOTE_SLIDE, time_hit=time_hit, time_release=time_release, duration=duration,
#			time_death=time_release+DEATH_DELAY, column=column, column_release=column_release, double_hit=false}
	return NoteSlide.new(time_hit, duration, column, column_release, slide_type)

static func make_touch(time_hit: float, location: Vector2) -> Dictionary:
	return {type=NOTE_TOUCH, time_hit=time_hit, time_death=time_hit+DEATH_DELAY, location=location, double_hit=false}

static func make_touch_hold(time_hit: float, duration: float, location: Vector2) -> Dictionary:
	var time_release := time_hit + duration
	return {type=NOTE_TOUCH_HOLD, time_hit=time_hit, time_release=time_release, time_death=time_release+DEATH_DELAY, location=location, double_hit=false}

static func process_note_list(note_array: Array):
	# Preprocess double hits, assign Slide IDs
	# If this were performance-critical, we'd single iterate it
	# It's not though, so we lay it out simply
	var slide_id := 0
	if len(note_array):
		# Doubles
		for i in len(note_array)-1:
			if note_array[i].time_hit == note_array[i+1].time_hit:
				note_array[i].double_hit = true
				note_array[i+1].double_hit = true
		# Slides
		for i in len(note_array):
			if note_array[i].type == NOTE_SLIDE:
				note_array[i].slide_id = slide_id
				slide_id += 1