import { NextRequest, NextResponse } from 'next/server'
import { UserService } from '@/lib/services/database-service'

const userService = new UserService()

export async function POST(request: NextRequest) {
  try {
    const body = await request.json()
    const { email, role } = body

    if (!email || !role) {
      return NextResponse.json(
        { success: false, error: '請提供電子郵件和角色' },
        { status: 400 }
      )
    }

    // 驗證電子郵件格式
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
    if (!emailRegex.test(email)) {
      return NextResponse.json(
        { success: false, error: '請輸入有效的電子郵件格式' },
        { status: 400 }
      )
    }

    // 驗證角色
    const validRoles = ['user', 'developer', 'admin']
    if (!validRoles.includes(role)) {
      return NextResponse.json(
        { success: false, error: '無效的角色值' },
        { status: 400 }
      )
    }

    // 檢查電子郵件是否已存在
    const existingUser = await userService.findByEmail(email)
    if (existingUser) {
      return NextResponse.json(
        { success: false, error: '此電子郵件已被使用' },
        { status: 400 }
      )
    }

    // 創建邀請用戶
    const result = await userService.createInvitedUser(email, role)

    if (result.success) {
      return NextResponse.json({
        success: true,
        message: '邀請用戶創建成功',
        data: {
          user: result.user,
          invitationLink: result.invitationLink
        }
      })
    } else {
      return NextResponse.json(
        { success: false, error: result.error },
        { status: 400 }
      )
    }

  } catch (error) {
    console.error('創建邀請用戶錯誤:', error)
    return NextResponse.json(
      { success: false, error: '創建邀請用戶時發生錯誤' },
      { status: 500 }
    )
  }
}

export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url)
    const page = parseInt(searchParams.get('page') || '1')
    const limit = parseInt(searchParams.get('limit') || '5')
    const search = searchParams.get('search') || ''
    const department = searchParams.get('department') || ''
    const role = searchParams.get('role') || ''
    const status = searchParams.get('status') || ''

    // 構建查詢條件
    let whereConditions = ['status IN ("active", "inactive", "invited")']
    let params: any[] = []

    if (search) {
      whereConditions.push('(name LIKE ? OR email LIKE ?)')
      params.push(`%${search}%`, `%${search}%`)
    }

    if (department && department !== 'all') {
      whereConditions.push('department = ?')
      params.push(department)
    }

    if (role && role !== 'all') {
      whereConditions.push('role = ?')
      params.push(role)
    }

    if (status && status !== 'all') {
      if (status === 'active') {
        whereConditions.push('status = "active"')
      } else if (status === 'inactive') {
        whereConditions.push('status = "inactive"')
      } else if (status === 'invited') {
        whereConditions.push('status = "invited"')
      }
    }

    const whereClause = whereConditions.length > 0 ? `WHERE ${whereConditions.join(' AND ')}` : ''

    // 使用 UserService 的方法
    const { users, total } = await userService.findAll({
      search,
      department,
      role,
      status,
      page,
      limit
    })

    const stats = await userService.getUserStats()

    // 映射用戶數據欄位，將資料庫欄位轉換為前端期望的欄位
    const mappedUsers = users.map(user => ({
      ...user,
      joinDate: user.join_date ? new Date(user.join_date).toLocaleDateString('zh-TW') : '-',
      lastLogin: user.last_login ? new Date(user.last_login).toLocaleString('zh-TW') : '-',
      status: user.status, // 直接使用資料庫的 status 欄位
      totalApps: 0, // 暫時設為 0，後續可以從統計數據中獲取
      totalReviews: 0, // 暫時設為 0，後續可以從統計數據中獲取
      totalLikes: user.total_likes || 0
    }))

    return NextResponse.json({
      success: true,
      data: {
        users: mappedUsers,
        pagination: {
          page,
          limit,
          total,
          totalPages: Math.ceil(total / limit)
        },
        stats: {
          totalUsers: stats?.totalUsers || 0,
          activeUsers: stats?.activeUsers || 0,
          adminCount: stats?.adminCount || 0,
          developerCount: stats?.developerCount || 0,
          inactiveUsers: stats?.invitedUsers || 0, // 將 invitedUsers 映射為 inactiveUsers（待註冊）
          newThisMonth: stats?.newThisMonth || 0
        }
      }
    })

  } catch (error) {
    console.error('獲取用戶列表錯誤:', error)
    return NextResponse.json(
      { error: '獲取用戶列表時發生錯誤' },
      { status: 500 }
    )
  }
}