import { Store } from 'web/index';
import { BaseLog } from 'base-log';
const log = new BaseLog('Visit');

export class Visit {
  store = new Store()
  storeName
  visits = []
  readyHandle
  isReady

  constructor (name?) {
    // type=0 表示初始加载+链接跳转加载，type=1 表示页面刷新，type=2表示前进后退加载
    const visitNeedClear = !performance || performance.navigation.type == 0;
    log.info('visitNeedClear',visitNeedClear);
    this.storeName = name ? 'visits.' + name : 'visits';
    this.store.get(this.storeName).then((visits) => {
      this.visits = visits || [];
      if(visitNeedClear) return this.clear();
      return Promise.resolve(this.visits);
    }).then(() => {
      if(this.readyHandle) this.readyHandle();
      this.isReady = true;
    });
  }

  ready = (readyHandle) => {
    this.readyHandle = readyHandle;
  }

  add = (visit) => {
    this.visits.push(visit);
    return this.sync();
  }


  remove = (step) => {
    if(step >= 0) return;
    step = step || -1;
    var len = this.visits.length;
    var end = len + step;
    this.visits = this.visits.slice(0, end);
    return this.sync();
  }

  // 获取索引，如果有多个相同值，则取最后一个索引
  findIndex = (visit) => {
    var index = -1;
    for (var i = 0, n = this.visits.length; i < n; i++) {
      var key = this.visits[i];
      if(visit == key) index = i;
    }
    return index;
  }

  getAll = () => {
    return this.visits;
  }

  clear = () => {
    this.visits = [];
    return this.sync();
  }

  count = () => {
    return this.visits.length;
  }

  // 同步本地存储
  sync = () => {
    return this.store.set(this.storeName, this.visits);
  }
}