// 云函数：dailyPush
// 每日定时推送运势通知
// 定时触发器：cron: 0 0 7 * * * *（每日 07:00）
// 或每分钟扫描：cron: 0 * * * * * *（支持用户自定义时间）

const cloud = require('wx-server-sdk')
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
const db = cloud.database()

// 引入共享算法包（需在云函数部署时安装）
// 由于云函数环境限制，算法代码会内联到本文件
// 参见 _algorithm.js 文件

const _ = require('./_algorithm')

exports.main = async (event, context) => {
  const now = new Date()
  const todayStr = now.toISOString().slice(0, 10)
  const currentHour = now.getHours()
  const currentMinute = now.getMinutes()

  console.log(`[dailyPush] Triggered at ${now.toISOString()}`)

  try {
    // 查询所有已开启推送的订阅
    const { data: subscriptions } = await db.collection('subscriptions')
      .where({
        pushEnabled: true,
      })
      .get()

    console.log(`[dailyPush] Found ${subscriptions.length} active subscriptions`)

    let pushCount = 0
    let skipCount = 0
    let errorCount = 0

    for (const sub of subscriptions) {
      try {
        // 检查是否已达到推送时间
        const [pushHour, pushMinute] = (sub.pushTime || '07:00').split(':').map(Number)
        if (currentHour !== pushHour || currentMinute !== pushMinute) {
          skipCount++
          continue
        }

        // 检查是否已推送过（防重复）
        if (sub.lastPushDate === todayStr) {
          skipCount++
          continue
        }

        // 生成运势内容
        const fortune = _.generatePushContent(sub.birthInfo, now)

        // 格式化推送内容
        const pushData = {
          touser: sub.openid,
          templateId: sub.templateId,
          page: '/pages/fortune/index', // 点击跳转到运势页面
          data: {
            date1: { value: formatDate(now) },
            thing2: { value: `综合运势评分${fortune.overallScore}分，等级：${fortune.overallLuck}` },
            thing3: { value: formatFortuneSummary(fortune) },
            thing4: { value: `幸运色：${fortune.luckyColor}  幸运数字：${fortune.luckyNumber}` },
          },
        }

        // 发送微信订阅消息
        await cloud.openapi.subscribeMessage.send(pushData)

        // 更新最后推送日期
        await db.collection('subscriptions').doc(sub._id).update({
          data: { lastPushDate: todayStr },
        })

        pushCount++
        console.log(`[dailyPush] Pushed to ${sub.openid}`)
      } catch (err) {
        errorCount++
        console.error(`[dailyPush] Failed for ${sub.openid}:`, err.message)
      }
    }

    return {
      success: true,
      summary: {
        total: subscriptions.length,
        pushed: pushCount,
        skipped: skipCount,
        errors: errorCount,
      },
    }
  } catch (err) {
    console.error('[dailyPush] Fatal error:', err)
    return { success: false, error: err.message }
  }
}

/**
 * 格式化日期为中文显示
 */
function formatDate(date) {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const weekdays = ['日', '一', '二', '三', '四', '五', '六']
  const weekday = weekdays[date.getDay()]
  return `${year}年${month}月${day}日 星期${weekday}`
}

/**
 * 格式化运势摘要
 */
function formatFortuneSummary(fortune) {
  const parts = []
  if (fortune.careerAdvice) {
    const brief = fortune.careerAdvice.length > 10
      ? fortune.careerAdvice.slice(0, 10) + '…'
      : fortune.careerAdvice
    parts.push(`事业：${brief}`)
  }
  if (fortune.wealthAdvice) {
    const brief = fortune.wealthAdvice.length > 10
      ? fortune.wealthAdvice.slice(0, 10) + '…'
      : fortune.wealthAdvice
    parts.push(`财运：${brief}`)
  }
  if (fortune.relationshipAdvice) {
    const brief = fortune.relationshipAdvice.length > 10
      ? fortune.relationshipAdvice.slice(0, 10) + '…'
      : fortune.relationshipAdvice
    parts.push(`感情：${brief}`)
  }
  if (fortune.healthAdvice) {
    const brief = fortune.healthAdvice.length > 10
      ? fortune.healthAdvice.slice(0, 10) + '…'
      : fortune.healthAdvice
    parts.push(`健康：${brief}`)
  }
  return parts.join('  ')
}