import Vue from 'vue';

// 1. 定义最宽松的基础类型（兼容所有场景，避开symbol索引签名限制）
type AutowiredTarget = {
  [key: string]: any;
};

// 2. Vue组件实例专属类型（仅声明string/number索引，运行时兼容symbol）
interface VueComponentInstance extends AutowiredTarget {
  created?: (...args: any[]) => Promise<void> | void;
  $router?: any;
  $route?: any;
  $el?: HTMLElement;
  $data?: Record<string, any>;
}

// 3. Logic实例类型
interface LogicInstance extends AutowiredTarget {
  mergeVueInstance?: <T extends VueComponentInstance>(vueInstance: T) => void;
}

// 4. 通用构造函数类型
type Constructor<T = any> = new (...args: any[]) => T;

/**
 * 自动注入实例装饰器
 * 适配所有场景：
 * - Vue组件的logic属性：自动创建Logic实例并合并Vue所有属性
 * - Logic类/普通类的属性：直接创建实例并挂载
 */
export function Autowired(params?: any) {
  return function (target: AutowiredTarget, propertyKey: string | symbol): void {
    // 获取属性对应的类构造函数
    const typeClass = Reflect.getMetadata('design:type', target, propertyKey) as Constructor;

    // 仅对Vue组件的logic属性做特殊处理（运行时判断）
    if (propertyKey === 'logic') {
      enhanceVueLogicProperty(target as VueComponentInstance, propertyKey, typeClass);
    } else {
      // 所有其他场景（包括Logic类的属性）：直接挂载实例
      mountNormalInstance(target, propertyKey, typeClass, params);
    }
  };
}

/**
 * 挂载普通实例（适配所有非Vue组件场景）
 */
function mountNormalInstance(
  target: AutowiredTarget,
  propertyKey: string | symbol,
  typeClass: Constructor,
  params?: any
): void {
  if (!typeClass) {
    console.warn(`类构造函数不存在，属性${String(propertyKey)}注入失败`);
    return;
  }

  // 创建实例并挂载（统一用defineProperty兼容symbol）
  const instance = params ? new typeClass(params) : new typeClass();
  Object.defineProperty(target, propertyKey, {
    value: instance,
    writable: true,
    configurable: true,
    enumerable: true
  });
}

/**
 * 增强Vue组件的logic属性：创建实例并合并Vue所有属性
 */
function enhanceVueLogicProperty(
  target: VueComponentInstance,
  propertyKey: string | symbol,
  typeClass: Constructor<LogicInstance>
): void {
  // 保存原始created钩子
  const originalCreated: (...args: any[]) => Promise<void> | void = target.created || (() => { });

  // 重写created钩子（显式指定this类型）
  target.created = async function (this: VueComponentInstance): Promise<void> {
    const vueInstance = this;

    // 防御性判断
    if (!typeClass) {
      console.warn(`Logic类构造函数不存在，属性${String(propertyKey)}注入失败`);
      await originalCreated.call(this);
      return;
    }

    // 创建Logic实例
    const logicInstance = Vue.observable(new typeClass());

    // 核心修复：用Object.defineProperty兼容symbol，避开TS索引检查
    Object.defineProperty(this, propertyKey, {
      value: logicInstance,
      writable: true,
      configurable: true,
      enumerable: true
    });

    // 合并Vue属性（仅当存在mergeVueInstance方法时）
    if (typeof logicInstance.mergeVueInstance === 'function') {
      logicInstance.mergeVueInstance(vueInstance);
      mergeVueProperties(logicInstance, vueInstance);
      resetLogicConstructor(logicInstance);
    }

    // 执行原始created钩子
    await originalCreated.call(this);
  };
}



/**
 * 合并Vue实例的所有属性到Logic实例
 */
function mergeVueProperties(logicInstance: LogicInstance, vueInstance: VueComponentInstance): void {
  const allProps = getAllVueProperties(vueInstance);
  const excludeProps = new Set<string | symbol>(['constructor', 'prototype', '__proto__', 'mergeVueInstance']);

  allProps.forEach(prop => {
    if (excludeProps.has(prop)) return;

    const logicPropDesc = Object.getOwnPropertyDescriptor(logicInstance, prop);
    if (logicPropDesc && !logicPropDesc.configurable) return;

    try {
      const vuePropDesc =
        Object.getOwnPropertyDescriptor(Object.getPrototypeOf(vueInstance), prop) ||
        Object.getOwnPropertyDescriptor(vueInstance, prop);

      if (vuePropDesc) {
        Object.defineProperty(logicInstance, prop, {
          ...vuePropDesc,
          enumerable: true,
          configurable: true
        });
      } else {
        // 兜底：用defineProperty赋值，兼容symbol
        Object.defineProperty(logicInstance, prop, {
          value: vueInstance[prop as keyof typeof vueInstance],
          enumerable: true,
          configurable: true,
          writable: true
        });
      }
    } catch (e) {
      if (typeof prop === 'string' && !['__proto__', 'constructor'].includes(prop)) {
        console.warn(`合并属性 ${String(prop)} 失败:`, e);
      }
    }
  });
}

/**
 * 收集Vue实例的所有属性（包括原型链、Symbol）
 */
function getAllVueProperties(obj: any): Set<string | symbol> {
  const props = new Set<string | symbol>();
  let currentObj: any = obj;

  while (currentObj && currentObj !== Object.prototype) {
    Object.getOwnPropertyNames(currentObj).forEach(prop => props.add(prop));
    Object.getOwnPropertySymbols(currentObj).forEach(prop => props.add(prop));
    currentObj = Object.getPrototypeOf(currentObj);
  }

  return props;
}

/**
 * 重置Logic实例的constructor指向
 */
function resetLogicConstructor(logicInstance: LogicInstance): void {
  Object.defineProperty(logicInstance, 'constructor', {
    value: logicInstance.constructor,
    configurable: true,
    enumerable: false,
    writable: true
  });
}