extends Node3D
class_name Move

@export var after_image_speed_curve: Curve

var after_image_speed_max: float = 10

@onready var character: Character = (get_owner() as Character)
@onready var status: Status = (%Status as Status)
@onready var buff: Buff = (%Buff as Buff)
@onready var effect: Effect = (%Effect as Effect)
@onready var battle: Battle = (%Battle as Battle)

var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")
var velocity_cache: Vector3


func _process(delta) -> void:
	if Global.is_level_loading: return
	if status.is_pause: return
	if status.is_be_throw: return
	move_tick(delta)
	return


func move_tick(delta) -> bool:
	var is_hit_floor: bool = update_on_floor(delta)
	update_move(delta)
	update_speed_y(delta)
	var is_against_wall: bool = update_move_check(delta)
	status.velocity_change = character.velocity.abs() - velocity_cache
	velocity_cache = character.velocity.abs()
	if character.velocity:
		SignalManager.character_pos_changed.emit(character.id(), character.pos())
		SignalManager.character_ui_pos_changed.emit(character.id(), character.ui_pos())
		SignalManager.character_status_changed.emit(status.id, "pos2d", character.pos2D())
	if is_hit_floor:
		SignalManager.character_hit_floor.emit(character.id(), character.pos())
	update_deformation(delta)
	update_move_effect(delta)
	return is_against_wall


func update_on_floor(delta) -> bool:
	var is_on_floor: bool = character.is_on_floor()
	var is_hit: bool      = not status.is_on_floor and is_on_floor
	status.is_on_floor = is_on_floor
	if status.is_on_floor and not status.is_jumping:
		status.is_jumped = false
	var is_skill_running: bool = status.is_skill_running and status.break_level != Enum.EBreakLevel.Walk
	if is_hit and not status.is_stagger and not is_skill_running:
		Global.effect_mgr.cast_particle(ResourceManager.particle_move_hit_ground, character.pos())
	return is_hit


func update_speed_y(delta) -> void:
	if status.is_speed_y_freeze:
		character.velocity.y = 0
		return
	var has_y_speed: bool = (status.skill_float_speed != 0) or (status.hit_up_speed != 0)
	if has_y_speed:
		character.velocity.y = status.skill_float_speed + status.hit_up_speed
	else:
		if not status.is_on_floor:
			character.velocity.y -= gravity * delta * status.cfg.move.gravity_scale
	status.speed_y = character.velocity.y


func update_move(delta):
	var move_velocity: Vector2     = status.move_dir.normalized() * (status.cfg.move.speed * (1 + status.speed_up_rate))
	var skill_velocity: Vector2    = status.skill_move_dir * status.skill_move_speed if not status.skill_move_stop else Vector2.ZERO
	var hit_back_velocity: Vector2 = status.hit_back_dir * status.hit_back_speed
	move_velocity += skill_velocity + hit_back_velocity
	status.speed_dir = Vector2(move_velocity.x, move_velocity.y)

	if skill_velocity.length() >0:
		move_velocity *= (1-status.speed_down_push_rate)
	if move_velocity.length() == 0:
		move_velocity = Vector2(character.velocity.x, character.velocity.z);
		if status.is_on_floor:
			move_velocity = Util.vector_reduce(move_velocity, Setting.drag_ground*delta)
		else:
			move_velocity = Util.vector_reduce(move_velocity, Setting.drag_air*delta)

	character.velocity.x = move_velocity.x
	character.velocity.z = move_velocity.y

	status.speed_xz = Vector2(character.velocity.x, character.velocity.z).length()
	if status.is_free_turn and status.move_dir.x != 0:
		status.is_right = status.move_dir.x > 0


func update_deformation(delta):
	var velocity_change_sum: float = status.velocity_change.x + status.velocity_change.y + status.velocity_change.z
	if velocity_change_sum > 6:
		var velocity_change_x: float = status.velocity_change.x
		var velocity_change_y: float = status.velocity_change.y + status.velocity_change.z
		var dir_x: int               = 1 if (velocity_change_x > 1) or (velocity_change_y < -1) else 0
		var dir_y: int               = 1 if (velocity_change_y > 1) or (velocity_change_x < -1) else 0
		if dir_x or dir_y:
			status.deformation_dir=Vector2(dir_x, dir_y)
			character.add_buff("deformation", 0.2)


func update_move_effect(delta):
	var speed: float             = character.velocity.length()
	var speed_rate: float        = clamp(speed / after_image_speed_max, 0, 1)
	var after_image_alpha: float = clamp(after_image_speed_curve.sample(speed_rate), 0, 1)
	if after_image_alpha > 0:
		effect.cast_after_image(after_image_alpha)
		pass
	if speed > 6:
		Global.effect_mgr.cast_particle(ResourceManager.particle_move_speed, character.view_pos(), character.velocity.normalized())
	var velocity_change_sum: float = status.velocity_change.x + status.velocity_change.y + status.velocity_change.z
	if velocity_change_sum > 6:
		Global.effect_mgr.cast_particle(ResourceManager.particle_move_dash, character.view_pos(), character.velocity.normalized())


func update_move_check(delta) -> bool:
	var velocity: Vector3 = character.velocity
	character.move_and_slide()
	if status.is_stagger:
		var collision_count: int = character.get_slide_collision_count()
		if collision_count > 0:
			var normal: Vector3 = Vector3.ZERO
			for i in collision_count:
				var collision: KinematicCollision3D = character.get_slide_collision(i)
				normal += collision.get_normal()
			normal = normal.normalized()
			var normal_speed: float = velocity.dot(normal)
			if normal_speed < -6 and normal.y >= 0:
				#墙体互动
				Global.effect_mgr.cast_particle(ResourceManager.particle_hit_ground_heavy, character.pos(), normal)
				var velocity_new: Vector3          = velocity - normal * normal_speed * 2
				var attack_dir: Vector2            = Vector2(velocity_new.x, velocity_new.z).normalized()
				character.velocity = Vector3.ZERO
				var attack_info: Struct.AttackInfo = Struct.AttackInfo.new()
				attack_info.attack = ResourceManager.cfg_attack_rebound
				attack_info.attack_box = ResourceManager.cfg_attack_box_rebound
				attack_info.attack_dir = attack_dir
				battle.add_attack(attack_info)
			elif normal_speed <-3:
				#反弹
				Global.effect_mgr.cast_particle(ResourceManager.particle_hit_ground_normal, character.pos(), normal)
				character.velocity = velocity - normal * normal_speed * 1.5
				character.add_buff("floating", -1)
				Global.camera_mgr.effect_shake(0.1)
			if normal.y == 0:
				return true
	return false


func jump():
	character.velocity.y = status.cfg.move.jump_velocity
	status.is_jumped = true
	status.trigger_jump = true
	buff.add_buff("jumping", 0.1)
	if status.is_on_floor:
		Global.effect_mgr.cast_particle(ResourceManager.particle_move_jump_ground, character.pos(), character.velocity.normalized())
	else:
		Global.effect_mgr.cast_particle(ResourceManager.particle_move_jump_air, character.pos(), character.velocity.normalized())


func stop():
	character.velocity = Vector3.ZERO