extends Node2D

@onready var camera: Camera2D = $Camera2D
#@onready var car: Node2D = $car_0

@onready var cars: Node = $cars

const caroffset=32+12 #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(0.1,0.1)
var zoomspeed=0.3
var zoomspeed_backup=0.05


# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	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,i*caroffset))
		i+=1
		
	#Load Map
	var mapscene=load("res://scenes/map_01.tscn")
	var mapsceneinstance=mapscene.instantiate()
	add_child(mapsceneinstance)


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	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
	for c in cars:
		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=meanCarPosition
	#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,viewsize.y-carSpread.y)
	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)
	elif calculatedViewCarMargin.x>(viewCarMargin_zoombackup.x*viewsize.x) and calculatedViewCarMargin.y>(viewCarMargin_zoombackup.y*viewsize.y): #cars in view again
		if camera.zoom.x<1.0:
			camera.zoom+=Vector2(zoomspeed_backup*delta,zoomspeed_backup*delta)
	
	#$Camera2D/speedlabel.text=str(carSpread)
	
	#$Camera2D/speedlabel.text=str(round(maxCarSpeed))
	
	


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))