var api = require('../../utils/api');
var bracket = require('../../utils/bracket');

Page({
  data: { loading: true, error: '', test: null, left: null, right: null, round: 1, progress: 0, completed: 0, totalDecisions: 0 },
  onLoad: function (options) {
    this.slug = options.slug;
    this.load();
  },
  load: function () {
    var self = this;
    api.request('/api/v1/tests/' + this.slug).then(function (test) {
      self.test = test;
      self.state = bracket.create(test.candidates);
      self.totalDecisions = test.candidates.length - 1;
      self.refreshPair();
      self.setData({ loading: false, test: test, totalDecisions: self.totalDecisions });
    }).catch(function (error) { self.setData({ loading: false, error: error.message || '加载失败' }); });
  },
  refreshPair: function () {
    var pair = bracket.current(this.state);
    this.setData({
      left: pair && pair[0],
      right: pair && pair[1],
      round: this.state.round,
      completed: this.state.decisions.length,
      progress: Math.round(this.state.decisions.length / this.totalDecisions * 100)
    });
  },
  choose: function (event) {
    if (this.choosing) return;
    this.choosing = true;
    var side = event.currentTarget.dataset.side;
    var winner = side === 'left' ? this.data.left : this.data.right;
    var finished = bracket.choose(this.state, winner);
    if (finished) this.complete();
    else {
      this.refreshPair();
      this.choosing = false;
    }
  },
  complete: function () {
    var self = this;
    var champion = this.state.pool[0];
    var finalDecision = this.state.decisions[this.state.decisions.length - 1];
    var runnerUpId = finalDecision.left_id === champion.id ? finalDecision.right_id : finalDecision.left_id;
    this.setData({ progress: 100, submitting: true });
    api.ensureLogin().then(function () {
      return api.request('/api/v1/tests/' + self.slug + '/runs', {
        method: 'POST',
        data: {
          app_key: 'hub',
          champion_id: champion.id,
          runner_up_id: runnerUpId,
          ranking_ids: bracket.ranking(self.state),
          decisions: self.state.decisions
        }
      });
    }).then(function (result) {
      xhs.setStorageSync('pk_last_result', result);
      xhs.redirectTo({ url: '/pages/result/result?id=' + result.id });
    }).catch(function (error) {
      self.choosing = false;
      self.setData({ submitting: false });
      xhs.showModal({ title: '结果保存失败', content: error.message || '请检查网络后重试', showCancel: false });
    });
  }
});