const app = getApp()

const ACHIEVEMENT_ICON_MAP = {
  MASTERED_10: '/assets/icons/achievements/core/mastered-10.svg',
  MASTERED_50: '/assets/icons/achievements/core/mastered-50.svg',
  MASTERED_100: '/assets/icons/achievements/core/mastery-advanced.svg',
  MASTERED_500: '/assets/icons/achievements/core/mastery-advanced.svg',
  MASTERED_1000: '/assets/icons/achievements/core/mastery-advanced.svg',
  MASTERED_2000: '/assets/icons/achievements/core/mastery-2000.svg',
  MASTERED_5000: '/assets/icons/achievements/core/mastery-5000.svg',
  MASTERED_10000: '/assets/icons/achievements/core/mastery-10000.svg',
  TOTAL_100: '/assets/icons/achievements/core/total-100.svg',
  CHECKIN_7: '/assets/icons/achievements/core/checkin-30.svg',
  CHECKIN_30: '/assets/icons/achievements/core/checkin-30.svg',
  CHECKIN_100: '/assets/icons/achievements/core/streak.svg',
  CHECKIN_180: '/assets/icons/achievements/core/streak.svg',
  CHECKIN_360: '/assets/icons/achievements/core/streak.svg',
  CHECKIN_STREAK_7: '/assets/icons/achievements/core/streak.svg',
  CHECKIN_STREAK_30: '/assets/icons/achievements/core/streak.svg',
  CHECKIN_STREAK_100: '/assets/icons/achievements/core/streak.svg',
  CHECKIN_STREAK_180: '/assets/icons/achievements/core/streak.svg',
  CHECKIN_STREAK_360: '/assets/icons/achievements/core/streak.svg',
  ACCURACY_80: '/assets/icons/achievements/core/accuracy.svg',
  ACCURACY_90: '/assets/icons/achievements/core/accuracy.svg',
  DAILY_REVIEW_20: '/assets/icons/achievements/core/review-volume.svg',
  DAILY_REVIEW_50: '/assets/icons/achievements/core/review-volume.svg',
}

const STATUS_ICON_MAP = {
  1: '/assets/icons/achievements/state/achievement-unlocked.svg',
  0: '/assets/icons/achievements/state/achievement-locked.svg',
}

const GROUP_ORDER = {
  mastery: 1,
  checkin: 2,
  streak: 3,
  accuracy: 4,
  review: 5,
  other: 9,
}

const GROUP_META = {
  mastery: { title: '掌握进阶', subtitle: '从入门到精通', icon: '/assets/icons/achievements/core/mastery-advanced.svg' },
  checkin: { title: '打卡里程', subtitle: '记录坚持的脚步', icon: '/assets/icons/achievements/core/checkin-30.svg' },
  streak: { title: '连续坚持', subtitle: '不断线的努力', icon: '/assets/icons/achievements/core/streak.svg' },
  accuracy: { title: '准确率', subtitle: '复习质量提升', icon: '/assets/icons/achievements/core/accuracy.svg' },
  review: { title: '复习数量', subtitle: '积累复习量', icon: '/assets/icons/achievements/core/review-volume.svg' },
  other: { title: '其他', subtitle: '更多成就', icon: '/assets/icons/achievements/core/total-100.svg' },
}

const GROUP_PROGRESS = {
  mastery: [10, 50, 100, 500, 1000, 2000, 5000, 10000],
  checkin: [7, 30, 100, 180, 360],
  streak: [7, 30, 100, 180, 360],
  accuracy: [80, 90],
  review: [20, 50],
}

function getNextTarget(items, values) {
  const unlockedMax = items.filter((item) => item.is_unlocked).reduce((max, item) => Math.max(max, item.target_value || 0), 0)
  const nextTarget = values.find((value) => value > unlockedMax)
  return nextTarget || null
}

function formatProgressText(key, items) {
  const values = GROUP_PROGRESS[key] || []
  const nextTarget = getNextTarget(items, values)
  const best = items.reduce((max, item) => Math.max(max, item.progress_value || 0), 0)
  if (nextTarget) {
    return `距离下一档还差 ${Math.max(0, nextTarget - best)} 个`
  }
  if (items.some((item) => item.is_unlocked)) {
    return '该分组已全部解锁'
  }
  return '继续坚持，解锁第一档'
}

Page({
  data: {
    total: 0,
    unlocked: 0,
    sections: [],
    loading: false,
    error: '',
  },
  onShow() {
    this.loadData()
  },
  getGroup(code) {
    if (code.startsWith('MASTERED_')) return 'mastery'
    if (code.startsWith('CHECKIN_STREAK_')) return 'streak'
    if (code.startsWith('CHECKIN_')) return 'checkin'
    if (code.startsWith('ACCURACY_')) return 'accuracy'
    if (code.startsWith('DAILY_REVIEW_')) return 'review'
    return 'other'
  },
  decorateList(list) {
    return (list || []).map((item) => ({
      ...item,
      group: this.getGroup(item.achievement_code),
      icon: ACHIEVEMENT_ICON_MAP[item.achievement_code] || GROUP_META[this.getGroup(item.achievement_code)].icon,
      stateIcon: STATUS_ICON_MAP[item.is_unlocked] || STATUS_ICON_MAP[0],
    }))
  },
  buildSections(list) {
    const buckets = { unlocked: {}, locked: {} }
    list.forEach((item) => {
      const state = item.is_unlocked ? 'unlocked' : 'locked'
      const key = item.group || 'other'
      if (!buckets[state][key]) buckets[state][key] = []
      buckets[state][key].push(item)
    })

    const buildStateSections = (state) => Object.keys(buckets[state])
      .sort((a, b) => (GROUP_ORDER[a] || 99) - (GROUP_ORDER[b] || 99))
      .map((key) => {
        const items = buckets[state][key].sort((a, b) => a.target_value - b.target_value)
        return {
          key: `${state}-${key}`,
          state,
          meta: GROUP_META[key] || GROUP_META.other,
          progressText: formatProgressText(key, list.filter((item) => item.group === key)),
          items,
        }
      })

    return [
      { key: 'unlocked', title: '已解锁', sections: buildStateSections('unlocked') },
      { key: 'locked', title: '未解锁', sections: buildStateSections('locked') },
    ].filter((group) => group.sections.length)
  },
  loadData() {
    this.setData({ loading: true, error: '' })
    wx.request({
      url: `${app.globalData.baseUrl}/api/v1/achievements`,
      header: { 'X-OpenID': app.globalData.openid || '' },
      success: (res) => {
        const list = this.decorateList(res.data?.data || [])
        const sections = this.buildSections(list)
        this.setData({
          sections,
          total: list.length,
          unlocked: list.filter((item) => item.is_unlocked).length,
        })
      },
      fail: () => this.setData({ error: '成就数据加载失败' }),
      complete: () => this.setData({ loading: false }),
    })
  },
  refreshAchievements() {
    this.setData({ loading: true, error: '' })
    wx.request({
      url: `${app.globalData.baseUrl}/api/v1/achievements/refresh`,
      method: 'POST',
      header: { 'X-OpenID': app.globalData.openid || '' },
      success: (res) => {
        const payload = res.data?.data || {}
        const list = this.decorateList(payload.achievements || [])
        const sections = this.buildSections(list)
        this.setData({
          sections,
          total: list.length,
          unlocked: list.filter((item) => item.is_unlocked).length,
        })
        if ((payload.just_unlocked_count || 0) > 0) {
          wx.showToast({ title: `新解锁 ${payload.just_unlocked_count} 项成就`, icon: 'success' })
        }
      },
      fail: () => this.setData({ error: '成就刷新失败' }),
      complete: () => this.setData({ loading: false }),
    })
  },
})