import { ReturnModelType } from '@typegoose/typegoose';
import { AnyParamConstructor } from '@typegoose/typegoose/lib/types';
import { Application, Context } from '@midwayjs/koa';
import { App, Inject } from '@midwayjs/decorator';
import _ = require('lodash');
import { FrameworkErrorEnum, ServiceError } from '../error/service.error';
import { GetModel } from '../util/getModel';
import { SearchBase } from '../../dist';
/**
 * Service基类,实现了一些基础的crud
 */
export abstract class BaseService<T extends AnyParamConstructor<any>> {
  @App()
  app: Application;
  @Inject()
  ctx: Context;

  // 要求继承基类的service,必须给上默认的model
  abstract model: ReturnModelType<T>;

  /**
   * 列表查询
   * @param {SearchBase} filter 查询条件
   * @param {object} pageOptions 分页条件
   * @param {Boolean} lean 是否使用JavaScript形式数据;false为mongoose的模型实例数据
   * @param {Boolean} populate 是否进行ref关联数据
   * @returns {Promise<object>} 返回列表
   */
  async query(filter: SearchBase, pageOptions: object = {}, lean = true, populate = true): Promise<object> {
    const dup = _.cloneDeep(filter.getFilter());
    const data = await this.model.find(dup, {}, { ...pageOptions }).lean(lean);
    return data;
  }

  /**
   * 数据总数查询
   * @param {SearchBase} filter 查询条件
   * @returns {number} 数据总数
   */
  async count(filter: SearchBase): Promise<number> {
    const dup = _.cloneDeep(filter.getFilter());
    const total = await this.model.count(dup);
    return total;
  }

  /**
   * 单查询-通过id
   * @param {string} id 查询对象数据id
   * @param {boolean} lean 是否使用JavaScript形式数据
   * @returns {object|undefined}
   */
  async fetch(id: string, lean = true): Promise<object | undefined> {
    const data = await this.model.findById(id).lean(lean);
    return data;
  }

  /**
   * 单修改-通过id
   * @param {string} id 修改对象数据id
   * @param {object} body 要修改的内容
   * @returns {object}
   */
  async updateOne(id: string, body: object): Promise<string> {
    if (!id) throw new ServiceError('缺少查询信息', FrameworkErrorEnum.NEED_PARAMS);
    const num = await this.model.count({ _id: id });
    if (num <= 0) throw new ServiceError('未找到要修改的数据', FrameworkErrorEnum.NOT_FOUND_DATA);
    await this.model.updateOne({ _id: id }, body);
    return 'ok';
  }

  /**
   * 多修改
   * @param {SearchBase} filter 要修改的对象查询条件
   * @param {object} body 要修改的内容
   * @returns {object}
   */
  async updateMany(filter: SearchBase, body: object): Promise<string> {
    if (!body) throw new ServiceError('缺少修改信息', FrameworkErrorEnum.NEED_BODY);
    const dup = _.cloneDeep(filter.getFilter());
    await this.model.updateMany(dup, body);
    return 'ok';
  }

  /**
   * 单删除-通过id
   * @param id 要删除的数据id
   * @returns {object}
   */
  async delete(id: string): Promise<string> {
    if (!id) throw new ServiceError('缺少数据信息', FrameworkErrorEnum.NEED_PARAMS);
    await this.model.deleteOne({ _id: id });
    return 'ok';
  }

  /**
   * 多删除
   * @param {SearchBase} filter 要删除的数据查询条件
   * @returns {object}
   */
  async deleteMany(filter: SearchBase): Promise<string> {
    const keys = Object.keys(filter);
    if (keys.length <= 0) throw new ServiceError('暂不提供清库服务', FrameworkErrorEnum.SERVICE_FAULT);
    const dup = _.cloneDeep(filter.getFilter());
    await this.model.deleteMany(dup);
    return 'ok';
  }

  /**
   * 单创建
   * @param body 要创建的数据内容
   * @returns {object}
   */
  async create(body: object): Promise<object> {
    const data = await this.model.create(body);
    return data;
  }

  /**
   * 多创建
   * @param body 要创建的多个数据
   * @returns {object[]}
   */
  async createMany(body: object[]): Promise<object> {
    const data = await this.model.insertMany(body);
    return data;
  }
  /**
   * 获取本服务默认表的ref关系
   */
  async getRefs() {
    const schema = _.get(this.model, 'schema.tree');
    const refs = [];
    for (const key in schema) {
      const f = schema[key];
      if (_.isObject(f) && _.get(f, 'ref')) {
        const model = GetModel(key);
        const path = key;
        refs.push({ path, model });
      }
    }
    return refs;
  }
}