class_name ComponentMovement
extends Node


signal direction_changed

@export_node_path("CharacterBody2D") var entityPath: NodePath
@onready var entity: CharacterBody2D = get_node(entityPath)

@export_node_path("AnimatedSprite2D") var spritePath: NodePath
@onready var sprite: AnimatedSprite2D = get_node(spritePath)

@export var SPEED: float

const DIRECTIONS = [Vector2.UP, Vector2.RIGHT, Vector2.DOWN, Vector2.LEFT]
var CURRENT_DIRECTION = Vector2.UP
var LAST_DIRECTION = Vector2.UP
var was_colliding = false

var animations: Dictionary = {
	"default": "default",
	"up": "up",
	"down": "down",
	"left": "left",
	"right": "right",
}

@export var timer_time: float = 3.0
@onready var MovementTimer: Timer = Timer.new()

@export var follows: bool = false
@export_range(1, 100, 1) var follow_chance: int = 100


func _ready():
	MovementTimer.wait_time = timer_time
	MovementTimer.autostart = true
	MovementTimer.connect("timeout", Callable(_on_movement_timer_timeout))
	add_child(MovementTimer)


func physics_process(delta):
	if CURRENT_DIRECTION == Vector2.UP:
		entity.velocity.y -= SPEED/2
		if sprite.sprite_frames.has_animation(animations["up"]):
			sprite.play(animations["up"])
	elif CURRENT_DIRECTION == Vector2.DOWN:
		entity.velocity.y += SPEED/2
		if sprite.sprite_frames.has_animation(animations["down"]):
			sprite.play(animations["down"])
	elif CURRENT_DIRECTION == Vector2.LEFT:
		entity.velocity.x -= SPEED/2
		if sprite.sprite_frames.has_animation(animations["left"]):
			sprite.play(animations["left"])
	elif CURRENT_DIRECTION == Vector2.RIGHT:
		entity.velocity.x += SPEED/2
		if sprite.sprite_frames.has_animation(animations["right"]):
			sprite.play(animations["right"])
	
	if sprite.sprite_frames.has_animation(animations["default"]):
		sprite.play(animations["default"])
	
	var collision = entity.move_and_collide(entity.velocity * delta)
	entity.velocity = entity.velocity.lerp(Vector2(0, 0), 1) # speed too low => no collision
	
	# todo movement along grid (maybe move position to current tile center)
	var target_grid_position = Utilities.from_grid_to_position(Utilities.get_level_position(entity) + CURRENT_DIRECTION)
	entity.position = entity.position.move_toward(target_grid_position, delta*SPEED/2)
	# todo or set velocity to tiles per SPEED per second somehow, instead of Timer
	
	if collision:
		was_colliding = true
		if MovementTimer.time_left > 0:
			_on_movement_timer_timeout()
	else:
		was_colliding = false
	
	return collision


func set_animations(new_animations: Dictionary):
	animations.merge(new_animations, true)


func _on_movement_timer_timeout():
	var randomize_direction = false

	if false and follows and randi_range(0, 100) <= follow_chance:
		var player_direction = entity.position.direction_to(Global.player.position)
		var query = PhysicsRayQueryParameters2D.new()
		query.set_from(entity.position)
		query.set_to(Global.player.position)
		query.set_collision_mask(entity.collision_mask)
		var intersection = entity.get_world_2d().direct_space_state.intersect_ray(query)
		if intersection:
			randomize_direction = true
		
		if abs(player_direction.x) >= abs(player_direction.y):
			if player_direction.x >= 0:
				CURRENT_DIRECTION = Vector2.RIGHT
			elif player_direction.x < 0:
				CURRENT_DIRECTION = Vector2.LEFT
		elif abs(player_direction.y) > abs(player_direction.x):
			if player_direction.y >= 0:
				CURRENT_DIRECTION = Vector2.DOWN
			elif player_direction.y < 0:
				CURRENT_DIRECTION = Vector2.UP
		
		if was_colliding and LAST_DIRECTION == CURRENT_DIRECTION:
			randomize_direction = true
	else:
		randomize_direction = true
		
	if randomize_direction:
		var directions = DIRECTIONS.duplicate()
		
		directions.erase(CURRENT_DIRECTION)
		directions.shuffle()
			
		if not directions.is_empty():
			CURRENT_DIRECTION = directions[0]

	emit_signal("direction_changed", CURRENT_DIRECTION)
	LAST_DIRECTION = CURRENT_DIRECTION
	
	if not sprite.sprite_frames.has_animation(animations["default"]):
		var frame = sprite.frame
		var progress = sprite.frame_progress
		if CURRENT_DIRECTION == Vector2.UP and sprite.sprite_frames.has_animation(animations["up"]):
			sprite.play(animations["up"])
		elif CURRENT_DIRECTION == Vector2.DOWN and sprite.sprite_frames.has_animation(animations["down"]):
			sprite.play(animations["down"])
		elif CURRENT_DIRECTION == Vector2.LEFT and sprite.sprite_frames.has_animation(animations["left"]):
			sprite.play(animations["left"])
		elif CURRENT_DIRECTION == Vector2.RIGHT and sprite.sprite_frames.has_animation(animations["right"]):
			sprite.play(animations["right"])
		sprite.set_frame_and_progress(frame, progress)
	
	MovementTimer.start()