extends Node2D

onready var cam = $MainCamera
onready var start_timer = $StartTimer

var is_round_won
signal round_won
signal arena_removed

# Used to test a level in creation
export (String) var levelToLoop
var levelSceneToLoop

export (Array, String) var levelNames = ["Square"]
var levelScenes = []
var levelOldNode
var levelCurrentNode
var levelIndex = -1
onready var levelSwap = $LevelSwap

var playerScene = preload("res://Player.tscn")
var playerActionsLeft = ["p1_left", "p2_left", "p3_left"]
var playerActionsRight = ["p1_right", "p2_right", "p3_right"]
export (Array, Color) var playerColors = [Color.red, Color.blue, Color.green, Color.yellow, Color.white, Color.cyan, Color.magenta, Color.orange]

func _ready():
	# Prepare levels
	for _k in range(levelNames.size()):
		levelScenes.append(null)

	levelSwap.connect("tween_completed", self, "_on_swap_completed")

	if levelToLoop:
		levelSceneToLoop = load_level(levelToLoop)
		if !levelSceneToLoop:
			push_error("Cant't load level " + levelToLoop)

	# Create players
	var player
	for k in 3:
		player = playerScene.instance()
		player.grid = levelCurrentNode
		player.turn_left_action = playerActionsLeft[k]
		player.turn_right_action = playerActionsRight[k]
		player.position = Vector2()
		player.modulate = playerColors[k]
		add_child(player)

		start_timer.connect("timeout", player, "_on_round_start")
		player.connect("crash", self, "_on_player_crash")
		self.connect("round_won", player, "_on_round_won")
		self.connect("arena_removed", player, "_on_arena_removed")

func load_level(name):
	var fullName = "res://Levels/" + name + ".tscn"
	return load(fullName)

func _unhandled_input(event):
	if event.is_action("ui_accept") and event.is_pressed():
		if is_round_won == null or is_round_won:
			is_round_won = false
			create_game()

func create_game():
	# Clear if required
	if levelCurrentNode:
		levelOldNode = levelCurrentNode

		levelSwap.swap_out(levelOldNode)
		emit_signal("arena_removed")

	# Create level node
	if levelToLoop:
		levelCurrentNode = levelSceneToLoop.instance()
	else:
		# Select next level
		levelIndex += 1

		if (levelIndex >= levelScenes.size()):
			levelIndex = 0
			levelScenes.shuffle()

		if !levelScenes[levelIndex]:
			levelScenes[levelIndex] = load_level(levelNames[levelIndex])

		levelCurrentNode = levelScenes[levelIndex].instance()

	# Put the level far away, the tween will bring it back
	levelCurrentNode.position.y = 2000

	# Manually spawn players for the first game
	if levelOldNode == null:
		add_child(levelCurrentNode)
		spawn_players()
		levelSwap.swap_in(levelCurrentNode)

func spawn_players():
	var spawners = get_tree().get_nodes_in_group("spawn")
	spawners.shuffle()

	var p = get_tree().get_nodes_in_group("players")

	for k in p.size():
		p[k].spawn(levelCurrentNode, spawners[k].position, spawners[k].rotation_degrees)

func _on_player_crash():
	if get_tree().get_nodes_in_group("running").size() <= 1 and !is_round_won:
		emit_signal("round_won")
		is_round_won = true

func _on_start_game():
	is_round_won = false

func _on_swap_completed(object, _k):
	if object == levelOldNode:
		remove_child(levelOldNode)
		levelOldNode.queue_free()
		levelOldNode = null

		add_child(levelCurrentNode)
		spawn_players()
		levelSwap.swap_in(levelCurrentNode)

	elif object == levelCurrentNode:
		start_timer.start()