class_name Statistics

extends Node

signal wave_finished
signal wave_started

var time_started
var time_survived

var wave_passed: int
var in_wave_gap: bool

var enemies_defeated: int
var bullet_shoot: int

@export var wave_gap_duration = 3
@export var wave_duration = 10
@export var wave_multiplier = 1.5

@export var wave_timer: Timer
@export var wave_gap_timer: Timer

func _ready():
	time_started = Time.get_ticks_msec()
	time_survived = null
	
	wave_passed = 0
	enemies_defeated = 0
	bullet_shoot = 0
	
	_on_wave_gap_passed()

func _on_game_over():
	time_survived = get_time_survived()

func get_current_wave():
	return wave_passed + 1

func get_current_wave_time():
	if in_wave_gap:
		return get_current_wave_duration() - $WaveGapTimer.time_left
	else:
		return get_current_wave_duration() - $WaveTimer.time_left

func get_current_wave_duration():
	if in_wave_gap:
		return wave_gap_duration
	else:
		return wave_duration + wave_multiplier * wave_passed

func get_time_survived():
	if time_survived == null:
		return Time.get_ticks_msec() - time_started
	else:
		return time_survived

func _on_enemy_defeated():
	enemies_defeated += 1

func _on_wave_passed():
	wave_passed += 1
	in_wave_gap = true
	wave_finished.emit()
	wave_gap_timer.start(wave_gap_duration)

func _on_wave_gap_passed():
	in_wave_gap = false
	wave_started.emit(get_current_wave())
	wave_timer.wait_time = get_current_wave_duration()
	wave_timer.start()