const { Router } = require('express')
const mongoose = require('mongoose')

const { getAnswer } = require('../../utils/common')
const { CigaretteModel } = require('./model/cigarette')
const { authMiddleware } = require('./middleware/auth')

const router = Router()

// Все эндпоинты статистики требуют авторизации
router.use(authMiddleware)

// Агрегация по дням: количество сигарет в день для построения графика
router.get('/daily', async (req, res, next) => {
  try {
    const user = req.user
    const { from, to } = req.query

    const now = new Date()
    const defaultFrom = new Date(now)
    defaultFrom.setDate(defaultFrom.getDate() - 30)

    const fromDate = from ? new Date(from) : defaultFrom
    const toDate = to ? new Date(to) : now

    const match = {
      userId: new mongoose.Types.ObjectId(user.id),
      smokedAt: {
        $gte: fromDate,
        $lte: toDate,
      },
    }

    // Отладка: проверяем, сколько записей попадает в фильтр
    const totalCount = await CigaretteModel.countDocuments(match)
    console.log('[STATS] Match filter:', JSON.stringify(match, null, 2))
    console.log('[STATS] Total cigarettes in range:', totalCount)

    const data = await CigaretteModel.aggregate([
      { $match: match },
      {
        $group: {
          _id: {
            $dateToString: { format: '%Y-%m-%d', date: '$smokedAt', timezone: 'UTC' },
          },
          count: { $sum: 1 },
        },
      },
      { $sort: { _id: 1 } },
    ])

    console.log('[STATS] Aggregation result:', data)

    const result = data.map((item) => ({
      date: item._id,
      count: item.count,
    }))

    res.json(getAnswer(null, result))
  } catch (err) {
    next(err)
  }
})

module.exports = router