import { Router } from 'express'
import pool from '../db/connection'
import { authMiddleware } from '../middleware/auth'
import { requireAdmin } from '../middleware/requireAdmin'

const router = Router()

/** 当前用户的反馈列表 */
router.get('/mine', authMiddleware, async (req, res) => {
  try {
    const userId = (req as any).userId
    const page = Math.max(1, parseInt(req.query.page as string) || 1)
    const pageSize = Math.min(100, Math.max(1, parseInt(req.query.pageSize as string) || 20))
    const offset = (page - 1) * pageSize

    const [countResult] = await pool.execute(
      'SELECT COUNT(*) as total FROM feedbacks WHERE user_id = ?',
      [userId]
    )
    const total = (countResult as any[])[0].total

    const [rows] = await pool.execute(
      `SELECT id, type, content, contact, status, admin_reply, created_at
       FROM feedbacks
       WHERE user_id = ?
       ORDER BY created_at DESC
       LIMIT ? OFFSET ?`,
      [userId, pageSize, offset]
    )

    res.json({ code: 0, data: { list: rows, total, page, pageSize } })
  } catch (error) {
    console.error('Get my feedback error:', error)
    res.status(500).json({ code: 50000, message: '获取失败' })
  }
})

/** 用户提交反馈 */
router.post('/', authMiddleware, async (req, res) => {
  try {
    const userId = (req as any).userId
    const { type, content, contact } = req.body

    if (!content || !content.trim()) {
      return res.status(400).json({ code: 40001, message: '请填写反馈内容' })
    }

    const validTypes = ['bug', 'feature', 'ux', 'other']
    const feedbackType = validTypes.includes(type) ? type : 'other'

    await pool.execute(
      'INSERT INTO feedbacks (user_id, type, content, contact) VALUES (?, ?, ?, ?)',
      [userId, feedbackType, content.trim(), contact || '']
    )

    res.json({ code: 0 })
  } catch (error) {
    console.error('Submit feedback error:', error)
    res.status(500).json({ code: 50000, message: '提交失败' })
  }
})

/** 管理员获取反馈列表 */
router.get('/', requireAdmin, async (req, res) => {
  try {
    const page = Math.max(1, parseInt(req.query.page as string) || 1)
    const pageSize = Math.min(100, Math.max(1, parseInt(req.query.pageSize as string) || 20))
    const status = req.query.status as string
    const offset = (page - 1) * pageSize

    let where = '1=1'
    const params: any[] = []

    if (status && ['pending', 'processed', 'ignored'].includes(status)) {
      where += ' AND f.status = ?'
      params.push(status)
    }

    const [countResult] = await pool.execute(
      `SELECT COUNT(*) as total FROM feedbacks f WHERE ${where}`,
      params
    )
    const total = (countResult as any[])[0].total

    // LIMIT/OFFSET 使用参数化查询
    const [rows] = await pool.execute(
      `SELECT f.*, u.nickname, u.avatar_url
       FROM feedbacks f
       LEFT JOIN users u ON f.user_id = u.id AND u.deleted_at IS NULL
       WHERE ${where}
       ORDER BY f.created_at DESC
       LIMIT ? OFFSET ?`,
      [...params, pageSize, offset]
    )

    res.json({ code: 0, data: { list: rows, total, page, pageSize } })
  } catch (error) {
    console.error('Get feedback list error:', error)
    res.status(500).json({ code: 50000, message: '获取失败' })
  }
})

/** 管理员更新反馈状态 */
router.put('/:id/status', requireAdmin, async (req, res) => {
  try {
    const { id } = req.params
    const { status, admin_reply } = req.body

    const validStatuses = ['pending', 'processed', 'ignored']
    if (!validStatuses.includes(status)) {
      return res.status(400).json({ code: 40001, message: '无效的状态' })
    }

    // 查询反馈信息（用于发送通知）
    const [feedbackRows] = await pool.execute(
      'SELECT user_id, content FROM feedbacks WHERE id = ?',
      [id]
    )
    const feedback = (feedbackRows as any[])[0]

    if (!feedback) {
      return res.status(404).json({ code: 40400, message: '反馈不存在' })
    }

    await pool.execute(
      'UPDATE feedbacks SET status = ?, admin_reply = ? WHERE id = ?',
      [status, admin_reply || '', id]
    )

    // 如果有管理员回复，发送通知给反馈提交者
    if (feedback && admin_reply && admin_reply.trim()) {
      const statusText: Record<string, string> = {
        processed: '已处理',
        ignored: '已忽略',
        pending: '待处理'
      }
      const replyPreview = admin_reply.trim().length > 50
        ? admin_reply.trim().slice(0, 50) + '...'
        : admin_reply.trim()

      await pool.execute(
        `INSERT INTO notifications (user_id, type, title, content)
         VALUES (?, 'personal', ?, ?)`,
        [
          feedback.user_id,
          `您的反馈已${statusText[status] || '更新'}`,
          `反馈内容：${feedback.content.slice(0, 30)}...\n\n管理员回复：${replyPreview}`
        ]
      )
    }

    res.json({ code: 0 })
  } catch (error) {
    console.error('Update feedback status error:', error)
    res.status(500).json({ code: 50000, message: '更新失败' })
  }
})

export default router