extends Node2D

@onready var camera: Camera2D = $Camera2D
@onready var countdown: Timer = $countdown
@onready var countdown_label: Label = $hud/countdown_label

@onready var cars: Node = $cars
@onready var times_container: HFlowContainer = $hud/times_container

const caroffset= 32+4 #space cars on start line

var viewCarMargin=Vector2(0.1,0.1) #proportions of viewsize. 0,0 = adjust when cars are outside view, 1,1=infinite zoom out
var viewCarMargin_zoomstart=viewCarMargin+Vector2(0.05,0.05)
var zoomspeed=1.0
var zoomspeed_backup=0.2
var zoom_normal=2
const CAMERA_POSITION_SPEED=0.98 #0.0 - 1.0, higher=faster

var running=false

var rounds=3



# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	countdown.start()
	countdown_label.visible=true
	
	#Load Map
	#var num_checkpoints=0
	var checkpoints :Array[String]=[]
	var mapscene=load("res://scenes/map_01.tscn")
	var mapsceneinstance=mapscene.instantiate()
	add_child(mapsceneinstance)
	for mapc in mapsceneinstance.get_children():
		if mapc.name.begins_with("area_cp"):
			#num_checkpoints+=1
			checkpoints.append(mapc.name)
	
	print(str(checkpoints.size())+" Checkpoints found")
	
	var i=0
	#for playerkey in Gamestate.getPlayerkeys(): #create all players
	for player in Gamestate.getPlayers():
		var newcarscene=load("res://scenes/car.tscn")
		var newcarinstance=newcarscene.instantiate()
		cars.add_child(newcarinstance)
		newcarinstance.setPlayerinformation(i,player.color)
		
		newcarinstance.setPosition(Vector2(0,ceil(i/2.0)*(fmod(i,2)-0.5)*2.0*caroffset))
		newcarinstance.setCheckpoints(checkpoints,rounds)
		newcarinstance.getCharacterBody().car_finished.connect(_on_car_finished)
		
		
		#print("Position car "+str(i)+" = "+str(ceil(i/2.0)*(fmod(i,2)-0.5)*2.0*caroffset))
		print("carpos is ="+str(newcarinstance.getPosition())+"  instancepos="+str(newcarinstance.position))
		i+=1
		


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	if running:
		Gamestate.addTimeElapsed(delta)
	if !countdown.is_stopped():
		countdown_label.text=str(round(countdown.time_left))
		
	var cars=cars.get_children()
	var meanCarPosition=Vector2.ZERO
	var displayedCarCount=0
	var maxCarSpeed=0
	var minPos=Vector2.ZERO #min/max x and y position of all cars
	var maxPos=Vector2.ZERO
	
	var oneDriving=false
	for c in cars: #check if any one car is still driving
		if !c.hasFinished():
			oneDriving=true
			
	for c in cars:
		if !c.hasFinished() or !oneDriving:
			var carpos = c.getPosition()
			meanCarPosition+=carpos
			
			maxCarSpeed=max(maxCarSpeed,c.getSpeed())
			if displayedCarCount==0:
				minPos.x=carpos.x
				minPos.y=carpos.y
				maxPos.x=carpos.x
				maxPos.y=carpos.y
			else:
				minPos.x=min(minPos.x,carpos.x)
				minPos.y=min(minPos.y,carpos.y)
				maxPos.x=max(maxPos.x,carpos.x)
				maxPos.y=max(maxPos.y,carpos.y)
			
			displayedCarCount+=1
		
	meanCarPosition/=displayedCarCount
	
	#camera.position=car.getPosition()
	camera.position=lerp(camera.position,meanCarPosition,CAMERA_POSITION_SPEED*delta)
	#rint("zoom = "+str(camera.zoom))
	#camera.zoom=Vector2(1.5,1.5)
	
	'''var allCarsInView=checkPositionInsideView(minPos) and checkPositionInsideView(maxPos)
	if not allCarsInView:
		camera.zoom-=Vector2(0.1*delta,0.1*delta)
	else:
		if camera.zoom<Vector2(1.0,1.0):
			camera.zoom+=Vector2(0.1*delta,0.1*delta)
	'''
	var viewCarMargin_zoombackup=viewCarMargin_zoomstart+Vector2(0.1,0.1)
	var viewsize = camera.get_viewport_rect().size/camera.zoom
	var carSpread=Vector2(maxPos.x-minPos.x,maxPos.y-minPos.y)
	var calculatedViewCarMargin=Vector2((viewsize.x-carSpread.x)/2,(viewsize.y-carSpread.y)/2)
	var mapped_zoomspeed_x=constrain(remap(calculatedViewCarMargin.x , viewCarMargin_zoomstart.x*viewsize.x,viewCarMargin.x*viewsize.x,0,zoomspeed),0,zoomspeed)
	var mapped_zoomspeed_y=constrain(remap(calculatedViewCarMargin.y , viewCarMargin_zoomstart.y*viewsize.y,viewCarMargin.y*viewsize.y,0,zoomspeed),0,zoomspeed)
	var mapped_zoomspeed=max(mapped_zoomspeed_x,mapped_zoomspeed_y)
	if calculatedViewCarMargin.x<(viewCarMargin_zoomstart.x*viewsize.x) or calculatedViewCarMargin.y<(viewCarMargin_zoomstart.y*viewsize.y): #cars not in view
		camera.zoom-=Vector2(mapped_zoomspeed*delta,mapped_zoomspeed*delta)
		#camera.zoom-=Vector2(0.1,0.1)
	elif calculatedViewCarMargin.x>(viewCarMargin_zoombackup.x*viewsize.x) and calculatedViewCarMargin.y>(viewCarMargin_zoombackup.y*viewsize.y): #cars in view again
		if camera.zoom.x<zoom_normal:
			camera.zoom+=Vector2(zoomspeed_backup*delta,zoomspeed_backup*delta)
	
	$hud/debuglabel.text=""
	$hud/timer.text=str(round(Gamestate.getTimeElapsed()*1000)/1000.0)
	


func _input(ev):
	#if ev is InputEventKey and 
	if Input.is_action_just_pressed("ui_cancel"):
		get_tree().change_scene_to_file("res://scenes/menu.tscn")
		
		
func checkPositionInsideView(checkpos: Vector2) -> bool:
	
	var viewsize = camera.get_viewport_rect().size
	var canvas_pos = camera.get_viewport().get_canvas_transform().affine_inverse() * -checkpos
	
	print("cp="+str(canvas_pos) + "  viewsize="+str(viewsize))

	if canvas_pos.x < 0 and canvas_pos.x > -viewsize.x:
		if canvas_pos.y < 0 and canvas_pos.y > -viewsize.y:
			return true
	return false
			

func constrain(val,a,b):
	var vmin=min(a,b)
	var vmax=max(a,b)
	return min(vmax,max(vmin,val))


func _on_countdown_timeout() -> void:
	running=true
	var cars=cars.get_children()
	for c in cars:
		c.setRunning(true)
	countdown_label.visible=false
	
func _on_car_finished(playerid,finalTime) -> void:
	print("Finished "+str(playerid)+" final time="+str(finalTime))
	var place=times_container.get_child_count()+1
	print("New Label. Place "+str(place))
	var newlabel= Label.new()
	times_container.add_child(newlabel)
	newlabel.set("theme_override_font_sizes/font_size",40)
	newlabel.text=str(place)+": "+str(round(finalTime*1000)/1000.0)+"s"
	newlabel.set("theme_override_colors/font_color",Gamestate.getPlayers()[playerid].color)