import { NextRequest, NextResponse } from 'next/server'
import bcrypt from 'bcryptjs'
import { v4 as uuidv4 } from 'uuid'
import { UserService } from '@/lib/services/database-service'

const userService = new UserService()

export async function POST(request: NextRequest) {
  try {
    const { name, email, password, department, role = 'user' } = await request.json()

    if (!name || !email || !password || !department) {
      return NextResponse.json(
        { error: '請填寫所有必填欄位' },
        { status: 400 }
      )
    }

    if (password.length < 6) {
      return NextResponse.json(
        { error: '密碼長度至少需要 6 個字符' },
        { status: 400 }
      )
    }

    // 檢查用戶是否已存在
    const existingUser = await userService.findByEmail(email)
    if (existingUser) {
      return NextResponse.json(
        { error: '該電子郵件已被註冊' },
        { status: 409 }
      )
    }

    // 加密密碼
    const saltRounds = 12
    const password_hash = await bcrypt.hash(password, saltRounds)

    // 創建新用戶
    const newUser = {
      id: uuidv4(),
      name,
      email,
      password_hash,
      department,
      role: role as 'user' | 'developer' | 'admin',
      join_date: new Date().toISOString().split('T')[0],
      total_likes: 0,
      total_views: 0,
      is_active: true
    }

    const createdUser = await userService.create(newUser)

    // 返回用戶信息（不包含密碼）
    const { password_hash: _, ...userWithoutPassword } = createdUser
    return NextResponse.json({
      success: true,
      user: userWithoutPassword
    })

  } catch (error) {
    console.error('註冊錯誤:', error)
    return NextResponse.json(
      { error: '註冊過程中發生錯誤' },
      { status: 500 }
    )
  }
}