TouhouGD/script/character/ai/ai.gd

extends Node3D
class_name AI

@onready var character: Character = (get_owner() as Character)
@onready var status: Status = (%Status as Status)

var ai: BeehaveTree
var is_init: bool = false
var has_ai: bool  = false


func _process(delta) -> void:
    if not is_init:
        init()
    else:
        process(delta)


func init() -> void:
    if not status.cfg:
        return
    is_init = true
    var ai_scene: PackedScene = status.cfg.get_ai()
    if not ai_scene:
        return
    ai = ai_scene.instantiate() as BeehaveTree
    add_child(ai)
    has_ai = true
    on_init()
    ai.init()


func process(delta) -> void:
    if has_ai and status.ai_is_alert:
        on_process(delta)
        ai.process(delta)
    else:
        if status.cfg.ai:
            stroll()
            var player: Character  = Global.character_mgr.get_player()
            var dir: Vector2       = player.pos2D() - character.pos2D()
            var dist: float        = dir.length()
            var can_see: bool      = character.get_face_dir().angle_to(dir) < PI/2
            var alert_range: float = status.cfg.ai.alert_range if can_see else status.cfg.ai.alert_range_back
            var alert_speed: float = status.cfg.ai.alert_speed if can_see else status.cfg.ai.alert_speed_back
            if dist < alert_range:
                status.ai_alert += alert_speed * delta
                status.emit_status("ai_alert")
                if status.ai_alert >= status.ai_alert_max:
                    status.ai_is_alert = true
                    status.ai_alert = 0
                    status.emit_status("ai_is_alert")
                    status.emit_status("ai_alert")
            else:
                status.ai_alert -= status.cfg.ai.alert_recover * delta
                if status.ai_alert < 0:
                    status.ai_alert = 0
                status.emit_status("ai_alert")
        else:
            status.ai_is_alert = true
            status.emit_status("ai_is_alert")


func stroll() -> void:
    #todo 闲逛
    character.move_stop()
    pass


func on_init() -> void:
    pass


func on_process(delta):
    pass