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)

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
    var is_hit_floor: bool = update_on_floor(delta)
    update_move(delta)
    update_speed_y(delta)
    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


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
    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_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_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)


func update_move_check(delta):
    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:
                #墙体互动
                character.velocity = velocity - normal * normal_speed * 2
                character.add_buff("floating", -1)
            elif normal_speed <-2:
                #反弹
                character.velocity = velocity - normal * normal_speed * 1.5
                character.add_buff("floating", -1)


func jump():
    character.velocity.y = status.cfg.move.jump_velocity
    status.is_jumped = true
    status.trigger_jump = true
    buff.add_buff("jumping", 0.1)


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