import { _decorator, Component, Node, Vec3, Prefab, instantiate, Collider2D, Contact2DType, IPhysics2DContact, math } from 'cc';
import { BulletInitData, WeaponConfig, BulletLifecycleConfig } from './BulletTypes';
import { ConfigLoader } from './ConfigLoader';
import { BulletCount } from './effects/BulletCount';
import { BulletTrajectory as BCBulletTrajectory } from './effects/BulletTrajectory';
import { BulletHitEffect as BCBulletHitEffect } from './effects/BulletHitEffect';
import { BulletLifecycle as BCBulletLifecycle } from './effects/BulletLifecycle';
import { BulletTrailController } from './BulletTrailController';

const { ccclass } = _decorator;

/** 可移植的统一子弹控制器 */
@ccclass('WeaponBulletController')
export class WeaponBulletController extends Component {
  private trajectory: BCBulletTrajectory | null = null;
  private hitEffect: BCBulletHitEffect | null = null;
  private lifecycle: BCBulletLifecycle | null = null;
  private trail: BulletTrailController | null = null;

  private weaponConfig: WeaponConfig | null = null;
  private isInitialized = false;

  // 图片“上为前进方向”的偏移修正（度）
  private readonly _orientationOffsetByWeapon: Record<string, number> = {
    sharp_carrot: -90,
    hot_pepper: -90,
    okra_missile: -90,
    mace_club: -90
  };

  private getOrientationOffset(): number {
    const id = this.weaponConfig?.id;
    if (!id) return 0;
    return this._orientationOffsetByWeapon[id] ?? 0;
  }

  public init(initData: BulletInitData) {
    // 装配配置
    this.weaponConfig = initData.weaponConfig ?? ConfigLoader.getWeaponConfig(initData.weaponId);
    if (!this.weaponConfig) {
      this.node.destroy();
      return;
    }

    // 计算方向
    const direction = (initData.direction?.clone() ?? new Vec3(1, 0, 0)).normalize();

    // 弹道
    this.trajectory = this.getComponent(BCBulletTrajectory) || this.addComponent(BCBulletTrajectory);
    const trajCfg = { ...this.weaponConfig.bulletConfig.trajectory, speed: this.weaponConfig.stats.bulletSpeed };
    this.trajectory.init(trajCfg, direction, initData.firePosition, initData.sourceBlock);

    // 初始位置略微前移，避免贴边重叠
    const spawnOffset = 30;
    const pos = this.node.position.clone();
    this.node.setPosition(pos.x + direction.x * spawnOffset, pos.y + direction.y * spawnOffset);

    // 命中效果
    this.hitEffect = this.getComponent(BCBulletHitEffect) || this.addComponent(BCBulletHitEffect);
    this.hitEffect.init(this.weaponConfig.bulletConfig.hitEffects);

    // 生命周期
    this.lifecycle = this.getComponent(BCBulletLifecycle) || this.addComponent(BCBulletLifecycle);
    const lc: BulletLifecycleConfig = { ...this.weaponConfig.bulletConfig.lifecycle };
    if (lc.type === 'return_trip' && !lc.maxRange && this.weaponConfig.stats.range) {
      lc.maxRange = this.weaponConfig.stats.range;
    }
    // 透传 pierce/ricochet 初始计数（若命中效果中有）
    const pierceInit = this.weaponConfig.bulletConfig.hitEffects.find(e => e.type === 'pierce_damage')?.pierceCount ?? lc.penetration ?? 0;
    const ricochetInit = this.weaponConfig.bulletConfig.hitEffects.find(e => e.type === 'ricochet_damage')?.ricochetCount ?? lc.ricochetCount ?? 0;
    this.lifecycle.init(lc, initData.firePosition, pierceInit, ricochetInit);

    // 拖尾（可选）
    this.trail = this.getComponent(BulletTrailController) || this.addComponent(BulletTrailController);

    // 旋转对齐外观
    const deg = math.toDegree(Math.atan2(direction.y, direction.x)) + this.getOrientationOffset();
    const shouldRotate = this.weaponConfig?.bulletConfig?.shouldRotate;
    const pelletNode = this.node.getChildByName('Pellet');
    if (shouldRotate === false && pelletNode) {
      pelletNode.angle = deg;
    } else {
      this.node.angle = deg;
    }

    // 启用持续外观对齐/自旋（贴合两种模式）
    if (this.trajectory) {
      this.trajectory.setFacingOptions({
        shouldRotate: shouldRotate,
        offsetDeg: this.getOrientationOffset(),
        targetChildName: pelletNode ? 'Pellet' : undefined,
        spinSpeedDeg: 720
      });
    }

    // 碰撞监听（若存在 Collider2D）
    const collider = this.getComponent(Collider2D);
    if (collider) {
      collider.on(Contact2DType.BEGIN_CONTACT, this.onCollision, this);
    }

    this.isInitialized = true;
  }

  private onCollision(self: Collider2D, other: Collider2D, contact: IPhysics2DContact | null) {
    if (!this.isInitialized || !this.hitEffect || !this.lifecycle) return;
    const result = this.hitEffect.applyOnHit();
    this.lifecycle.notifyHit(result);
    if (this.lifecycle.shouldDestroyNow()) {
      this.node.destroy();
      return;
    }
  }
}

/**
 * 工具：批量创建子弹（Prefab 或 Node 模板）
 */
export class BulletEngine {
  static createBullets(initData: BulletInitData, bulletTemplate: Prefab | Node): Node[] {
    // 获取配置
    const config = initData.weaponConfig ?? ConfigLoader.getWeaponConfig(initData.weaponId);
    if (!config) return [];

    const dir = (initData.direction?.clone() ?? new Vec3(1, 0, 0)).normalize();
    const spawns = BulletCount.calculateSpawns(config.bulletConfig.count, initData.firePosition, dir);
    const nodes: Node[] = [];

    for (const s of spawns) {
      const node = instantiate(bulletTemplate) as Node;
      const ctrl = node.getComponent(WeaponBulletController) || node.addComponent(WeaponBulletController);
      // 处理延迟：先禁用，延时后启用
      if (s.delayMs > 0) {
        node.active = false;
        ctrl.init({ ...initData, firePosition: s.position, direction: s.direction, weaponConfig: config });
        nodes.push(node);
        setTimeout(() => { if (node && node.isValid) node.active = true; }, s.delayMs);
      } else {
        ctrl.init({ ...initData, firePosition: s.position, direction: s.direction, weaponConfig: config });
        nodes.push(node);
      }
    }
    return nodes;
  }
}