import React, { Component } from 'react';
import PropTypes from 'prop-types';
import ReactDOM from 'react-dom';
import { component, RxSelector, BaseModel, changeOperators } from '../../../src/index'; // #! damo-core

/**
 * ----------------------------------------------------------------------------
 *                            Model == Table
 *    { generatorKey - 唯一键, properties - 字段集, crud - 增删查改方法 }
 * 1. this.getQuery(ajaxOption, changeOption) - 通过getQuery返回更新DB数据的方法（当方法调用时就会执行更新数据）
 * 2. ajaxOption - http模块调用配置项
 * 3. changeOption - 更新DB数据的策略（更新的属性以及更新的方式）
 * ----------------------------------------------------------------------------
 */
class RxPollingModel extends BaseModel {
  get generatorKey() {
    return 'id';
  }

  get properties() {
    return {
      list: []
    };
  }

  fetch(params) {
    return this.getQuery({
      uri: 'demo/mocks/list.json',
      method: 'get',
      body: params,

      name: 'list',
      change: changeOperators['RECONFIGURE']
    });
  }
}

/**
 * ----------------------------------------------------------------------------
 *                            Selector == Controller
 * { inputs - DB输入流向组件, outputs - 提供方法用于更新DB数据, initialize - 初始化 }
 * 1. this.getModel(name) - 获取model实例，只有通过model的方法才能更新到DB数据
 * ----------------------------------------------------------------------------
 */
class RxPollingSelector extends RxSelector {
  constructor(){
    super();
    // 动态添加Model到DB
    this.getAppStore().addModel(RxPollingModel)
  }

  get inputs() {
    return (state, ownProps) => {
      return {
        list: state.rxPollingModel.list
      }
    }
  }

  initialize(ownProps) {
    let pollingTimes = 0;
    this.pollingSubscribe('fetch', (stream, action, polling) => {
      return stream
        .flatMap(() => {
          return this.getModel('rxPollingModel').fetch()(this.dispatch);
        })
        .flatMap(res => {
          return polling({
            data: res,
            checkSuccess: (res) => {
              return pollingTimes < 10;
            },
            action: (res) => {
              console.log('polling times: ' + pollingTimes);
              pollingTimes ++;
              return this.getModel('rxPollingModel').fetch()(this.dispatch);
            }
          })
        });
    }, true);
  }
}

/**
 * ----------------------------------------------------------------------------
 *                            AppRouter == View
 * { PropTypes - 默认数据, defaultProps - 流向组件的数据需要声明数据类型, contextTypes - context类型声明, lifeCycle - 组件生命周期 }
 * component的作用相当于connect，而selector的inputs和outputs相当于connenct的①和②参数
 * 所有DB数据都会冻结变更，除非调用asMutable才可变更。
 * ----------------------------------------------------------------------------
 */
@component({
  selector: RxPollingSelector
})
export default class RxPollingScene extends Component {
  static routePath = '/mvc-rx/mvc-rx-polling';

  static contextTypes = {
    selector: PropTypes.any.isRequired,
  }

  static PropTypes = {
    list: PropTypes.array.isRequired
  }

  render() {
    return (
      <div>
        <ul>
          {
            this.props.list
              .asMutable({ deep: true })
              .map((item, index) => <li key={index}>{item.text || item}</li>)
          }
        </ul>
      </div>
    );
  }
}