extends Node3D

@onready var player1: CharacterBody3D = $Player1
@onready var camera: Camera3D = $Camera3D
@onready var level: Node3D = $Level
@onready var world_coloring_viewport: SubViewport = $WorldColoringViewport
@onready var world_coloring_player1_texture_rect: TextureRect = $WorldColoringViewport/Player1TextureRect

var camera_offset: Vector3;
var world_coloring_material: ShaderMaterial
var world_coloring_texture: ImageTexture
var world_coloring_image: Image

const player_mask_texture: = preload("res://assets/textures/player_draw_mask.png")
var player_mask_image: ImageTexture;


# Called when the node enters the scene tree for the first time.
func _ready():
	camera_offset = camera.global_position - player1.global_position

	world_coloring_material = load("res://materials/WorldColoringMaterialPass.tres")
	world_coloring_material.set_shader_parameter("world_color_texture", world_coloring_texture)

	world_coloring_image = Image.create(1000, 1000, 0, Image.FORMAT_RGBA8);
	world_coloring_image.fill(Color(1, 0, 1, 1))
	world_coloring_texture = ImageTexture.create_from_image(world_coloring_image)

	apply_world_coloring_recursive(level)

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(_delta):
	camera.global_position = player1.global_position + camera_offset
	pass

func _physics_process(_delta):
	#var player_world_color_coordinate : Vector2 = player1.global_position
	var world_coloring_player1_rect : Rect2
	world_coloring_player1_rect.position = player_position_to_world_coloring_position(player1.global_position)
	world_coloring_player1_rect.size = Vector2(10, 10)
	
	world_coloring_image.fill_rect(world_coloring_player1_rect, player1.color)
	world_coloring_texture = ImageTexture.create_from_image(world_coloring_image)
	
	apply_world_coloring_recursive(level)

func player_position_to_world_coloring_position(position: Vector3):
	var result = Vector2 (position.x * 10 + 495, position.z * 10 + 495)
	return result;

func apply_world_coloring_recursive (node):
	for child in node.get_children():
		var mesh_instance := child as MeshInstance3D
		if mesh_instance:
			assign_world_coloring_pass(mesh_instance)

		apply_world_coloring_recursive(child)

func assign_world_coloring_pass(mesh_instance: MeshInstance3D) -> void:
	var material = mesh_instance.get_active_material(0)
	if not material:
		return
	
	var world_coloring_pass :ShaderMaterial = material.next_pass as ShaderMaterial
	world_coloring_pass.set_shader_parameter("world_color_texture", world_coloring_texture)