const app = getApp()

const getReviewSettings = () => {
  const settings = app.globalData.userSettings || {}
  return {
    autoNextQuestion: Number(settings.auto_next_question || 0) === 1,
    showAnswerAfterSubmit: Number(settings.show_answer_after_submit || 0) === 1,
    blankCount: Number(settings.blank_count || 2),
    blankDifficulty: settings.blank_difficulty || 'normal',
  }
}

Page({
  data: {
    progress: 0,
    current: 1,
    total: 0,
    word: '',
    meaning: '',
    answer: '',
    feedback: '',
    revealAnswer: '',
    feedbackType: '',
    showFeedback: false,
    completed: false,
    masterHint: false,
    questions: [],
    loading: false,
    error: '',
    settings: getReviewSettings(),
  },
  submitting: false,
  judged: false,
  onLoad() {
    this.loadSettingsAndQuestions()
  },
  loadSettingsAndQuestions() {
    if (!app.globalData.openid) {
      this.setData({ error: '请先登录' })
      return
    }
    wx.request({
      url: `${app.globalData.baseUrl}/api/v1/settings`,
      header: { 'X-OpenID': app.globalData.openid },
      success: (res) => {
        app.globalData.userSettings = res.data?.data || {}
        this.setData({ settings: getReviewSettings() })
        this.loadQuestions()
      },
      fail: () => {
        this.setData({ error: '设置加载失败' })
        this.loadQuestions()
      },
    })
  },
  loadQuestions() {
    const session = app.globalData.reviewSessionMeta
    if (!session) {
      this.setData({ error: '暂无复习会话' })
      return
    }
    this.setData({ loading: true, error: '' })
    wx.request({
      url: `${app.globalData.baseUrl}/api/v1/review/questions?session_id=${session.id}`,
      header: { 'X-OpenID': app.globalData.openid || '' },
      success: (res) => {
        const questions = (res.data?.data || []).map((item) => {
          if (item.question_mode === 'C') {
            return {
              ...item,
              blank_prompt: item.blank_prompt || item.prompt,
            }
          }
          return item
        })
        app.globalData.reviewSession = {
          deck: questions,
          currentIndex: 0,
          correctCount: 0,
          wrongCount: 0,
          completed: false,
          currentAnswer: '',
          startedAt: Date.now(),
        }
        this.setData({ questions })
        this.syncSession()
      },
      fail: () => this.setData({ error: '题目加载失败' }),
      complete: () => this.setData({ loading: false }),
    })
  },
  syncSession() {
    const session = app.globalData.reviewSession
    const current = session.deck[session.currentIndex]
    const total = session.deck.length || 1
    this.setData({
      progress: Math.round((session.currentIndex / total) * 100),
      current: session.currentIndex + 1,
      total,
      word: current?.question_mode === 'C' ? (current?.blank_prompt || current?.prompt || '') : (current?.prompt || ''),
      meaning: current?.question_mode === 'C' ? (current?.answer_hint || '') : '',
      answer: session.currentAnswer || '',
      feedback: '',
      revealAnswer: '',
      feedbackType: '',
      showFeedback: false,
      completed: session.completed,
      masterHint: false,
    })
  },
  onAnswerInput(e) {
    const answer = e.detail.value
    app.globalData.reviewSession.currentAnswer = answer
    this.setData({ answer, showFeedback: false, revealAnswer: '', feedback: '', feedbackType: '', judged: false })
  },
  submitAnswer(showExplanation = false) {
    const session = app.globalData.reviewSession
    const current = session.deck[session.currentIndex]
    if (!current || this.submitting || this.judged) return

    const answer = (this.data.answer || '').trim()
    if (!answer) {
      wx.showToast({ title: '请先输入答案', icon: 'none' })
      return
    }

    this.submitting = true
    wx.request({
      url: `${app.globalData.baseUrl}/api/v1/review/submit`,
      method: 'POST',
      header: { 'Content-Type': 'application/json', 'X-OpenID': app.globalData.openid || '' },
      data: {
        session_id: app.globalData.reviewSessionMeta.id,
        entry_id: current.entry_id,
        question_mode: current.question_mode,
        user_answer: answer,
      },
      success: (res) => {
        const result = res.data?.data || {}
        session.correctCount += result.is_correct ? 1 : 0
        session.wrongCount += result.is_correct ? 0 : 1
        this.judged = true
        const shouldShowAnswer = showExplanation || this.data.settings.showAnswerAfterSubmit
        this.setData({
          feedback: result.is_correct ? '回答正确' : '回答错误',
          feedbackType: result.is_correct ? 'correct' : 'wrong',
          revealAnswer: shouldShowAnswer ? `正确答案：${result.correct_answer}` : '',
          showFeedback: true,
        })
        if (this.data.settings.autoNextQuestion) {
          setTimeout(() => this.nextQuestion(), shouldShowAnswer ? 1200 : 0)
        }
      },
      complete: () => {
        this.submitting = false
      },
    })
  },
  checkAnswer() {
    this.submitAnswer(true)
  },
  nextQuestion() {
    const session = app.globalData.reviewSession
    if (!session.deck.length) return
    if (!this.judged) {
      wx.showToast({ title: '请先提交答案', icon: 'none' })
      return
    }
    this.judged = false
    if (session.currentIndex >= session.deck.length - 1) {
      session.completed = true
      session.endedAt = Date.now()
      wx.request({
        url: `${app.globalData.baseUrl}/api/v1/review/finish?session_id=${app.globalData.reviewSessionMeta.id}`,
        method: 'POST',
        header: { 'X-OpenID': app.globalData.openid || '' },
        success: () => wx.navigateTo({ url: '/pages/review-result/review-result' }),
      })
      return
    }
    session.currentIndex += 1
    session.currentAnswer = ''
    this.syncSession()
  },
  markMastered() {
    this.setData({ masterHint: true })
    wx.showToast({ title: '已标记', icon: 'success' })
  },
})