extends GridMap
class_name Chunk

const Entity3D = preload("res://scenes/Instance.tscn")

var x = 0
var z = 0
var size = 0
var should_remove = false

func _init(x: int, z: int, size: int):
	self.x = x
	self.z = z
	self.size = size
	mesh_library = load("res://assets/blocs/blocs.meshlib")
	cell_size = Vector3(1, 1, 1)
	cell_center_x = false
	cell_center_y = false
	cell_center_z = false
	set_collision_layer_value(7, true)
	set_collision_mask_value(7, true)
	set_collision_layer_value(8, true)
	set_collision_mask_value(8, true)
	
	create_chunk()
	create_water()
	
	Global.world.new_entity.connect(_on_new_entity)
	

func create_chunk():
	for mx in size:
		for mz in size:
			var position = Vector2i(mx + (size) * x, mz + (size) * z)
#			position.x = min(position.x, Global.world.width - 1)
#			position.y = min(position.y, Global.world.height - 1)
			var bloc = Global.world.get_bloc(position)
			var my: float = bloc.position.y
			var meshID 
			var mesh_rotation 
			if bloc.type != 0:
				var neighbours = Global.world.get_neighbours_4_at_same_height(position)
				if neighbours == Global.directions_4.RIGHT:
					meshID = Global.bloc_sides_id.SIDE_3
					mesh_rotation = Global.GRID_ROTATION[3]
				elif neighbours == Global.directions_4.LEFT:
					meshID = Global.bloc_sides_id.SIDE_3
					mesh_rotation = Global.GRID_ROTATION[1]
				elif neighbours == Global.directions_4.LEFT + Global.directions_4.RIGHT:
					meshID = Global.bloc_sides_id.SIDE_2_OPPOSITE
					mesh_rotation = Global.GRID_ROTATION[0]
				elif neighbours == Global.directions_4.BOTTOM:
					meshID = Global.bloc_sides_id.SIDE_3
					mesh_rotation = Global.GRID_ROTATION[0]
				elif neighbours == Global.directions_4.BOTTOM + Global.directions_4.RIGHT:
					meshID = Global.bloc_sides_id.SIDE_2_ANGLE
					mesh_rotation = Global.GRID_ROTATION[3]
				elif neighbours == Global.directions_4.BOTTOM + Global.directions_4.LEFT:
					meshID = Global.bloc_sides_id.SIDE_2_ANGLE
					mesh_rotation = Global.GRID_ROTATION[0]
				elif neighbours == Global.directions_4.BOTTOM + Global.directions_4.LEFT + Global.directions_4.RIGHT:
					meshID = Global.bloc_sides_id.SIDE_1
					mesh_rotation = Global.GRID_ROTATION[0]
				elif neighbours == Global.directions_4.TOP:
					meshID = Global.bloc_sides_id.SIDE_3
					mesh_rotation = Global.GRID_ROTATION[2]
				elif neighbours == Global.directions_4.TOP + Global.directions_4.RIGHT:
					meshID = Global.bloc_sides_id.SIDE_2_ANGLE
					mesh_rotation = Global.GRID_ROTATION[2]
				elif neighbours == Global.directions_4.TOP + Global.directions_4.LEFT:
					meshID = Global.bloc_sides_id.SIDE_2_ANGLE
					mesh_rotation = Global.GRID_ROTATION[1]
				elif neighbours == Global.directions_4.TOP + Global.directions_4.LEFT + Global.directions_4.RIGHT:
					meshID = Global.bloc_sides_id.SIDE_1
					mesh_rotation = Global.GRID_ROTATION[2]
				elif neighbours == Global.directions_4.TOP + Global.directions_4.BOTTOM:
					meshID = Global.bloc_sides_id.SIDE_2_OPPOSITE
					mesh_rotation = Global.GRID_ROTATION[1]
				elif neighbours == Global.directions_4.TOP + Global.directions_4.BOTTOM + Global.directions_4.RIGHT:
					meshID = Global.bloc_sides_id.SIDE_1
					mesh_rotation = Global.GRID_ROTATION[3]
				elif neighbours == Global.directions_4.TOP + Global.directions_4.BOTTOM + Global.directions_4.LEFT:
					meshID = Global.bloc_sides_id.SIDE_1
					mesh_rotation = Global.GRID_ROTATION[1]
				elif neighbours == Global.directions_4.TOP + Global.directions_4.BOTTOM + Global.directions_4.LEFT + Global.directions_4.RIGHT:
					meshID = Global.bloc_sides_id.SIDE_0
					mesh_rotation = Global.GRID_ROTATION[0]
				elif neighbours == 0:
					meshID = Global.bloc_sides_id.SIDE_4
					mesh_rotation = Global.GRID_ROTATION[0]

				set_cell_item( Vector3(mx, my, mz) , meshID, mesh_rotation)

func create_water():
	var plane_mesh = PlaneMesh.new()
	plane_mesh.size = Vector2(size, size)
	plane_mesh.material = preload("res://assets/water.material")
	
	var mesh_instance = MeshInstance3D.new()
	mesh_instance.mesh = plane_mesh
	
	var collision_shape = CollisionShape3D.new()
	var box = BoxShape3D.new()
	box.size = Vector3(512, 0, 512)
	collision_shape.shape = box
	
	var static_body = StaticBody3D.new()
	static_body.set_name("Ocean")
	static_body.set_collision_layer_value(8, true)
	static_body.add_child(mesh_instance)
	static_body.add_child(collision_shape)
	static_body.translate(Vector3(size/2, 0.5, size/2))
	add_child(static_body)

func is_inside_chunk(position: Vector2i) :
	var min_x = x * size
	var max_x = (x + 1) * size - 1
	var min_y = z * size
	var max_y = (z + 1) * size - 1
	
	if position.x >= min_x and position.x <= max_x and position.y >= min_y and position.y <= max_y:
		return true
	return false
	
func get_chunk_position(position: Vector2i):
	var min_x = x * size
	var max_x = (x + 1) * size - 1
	var min_y = z * size
	var max_y = (z + 1) * size - 1
	
	var chunk_position = Vector2i(position.x - min_x, position.y - min_y)
	if chunk_position.x > max_x or chunk_position.y > max_y:
		return null
	return chunk_position

func _on_new_entity(entity):
	if is_inside_chunk(entity.position):
		var chunk_position = get_chunk_position(entity.position)
		var entity_position = Vector3(chunk_position.x, entity.get_height(), chunk_position.y)
		var entity_instance = Entity3D.instantiate()
		entity_instance.id = entity.id
		entity_instance.position = entity_position
		entity_instance.connect_to_world(entity_instance.id) 
		add_child(entity_instance)