import { NextApiRequest, NextApiResponse } from 'next'
import { auth, db } from '../../../lib/supabase'
import { handleApiError, validateEmail, validatePassword } from '../../../lib/api-utils'

interface RegisterRequest {
  email: string
  password: string
  name: string
  phone?: string
  user_type: 'individual' | 'enterprise'
  enterprise_id?: string
}

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  if (req.method !== 'POST') {
    return res.status(405).json({ success: false, error: '方法不允许' })
  }

  try {
    const { email, password, name, phone, user_type, enterprise_id }: RegisterRequest = req.body

    // 验证必填字段
    if (!email || !password || !name || !user_type) {
      return res.status(400).json({ 
        success: false,
        error: '缺少必填字段',
        details: '邮箱、密码、姓名和用户类型为必填项'
      })
    }

    // 验证邮箱格式
    if (!validateEmail(email)) {
      return res.status(400).json({ 
        success: false, 
        error: '邮箱格式不正确' 
      })
    }

    // 验证密码强度
    const passwordValidation = validatePassword(password)
    if (!passwordValidation.valid) {
      return res.status(400).json({ 
        success: false, 
        error: passwordValidation.message 
      })
    }

    // 检查邮箱是否已注册
    try {
      const existingUsers = await db.select('users', '*')
      const existingUser = existingUsers.find((user: any) => user.email === email)
      if (existingUser) {
        return res.status(400).json({ 
          success: false, 
          error: '该邮箱已被注册' 
        })
      }
    } catch (error) {
      console.error('Check existing user error:', error)
      // 继续注册流程，让Supabase处理重复邮箱的情况
    }

    // 注册用户
    const authData = await auth.signUp(email, password, {
      name,
      phone,
      user_type,
      enterprise_id
    })

    if (!authData?.user) {
      return res.status(400).json({ 
        success: false, 
        error: '注册失败，请稍后重试' 
      })
    }

    // 创建用户记录
    try {
      const userData = {
        id: authData.user.id,
        email,
        name,
        phone: phone || null,
        user_type,
        enterprise_id: enterprise_id || null,
        status: 'active',
        created_at: new Date().toISOString(),
        updated_at: new Date().toISOString()
      }

      const userRecord = await db.insert('users', userData)

      return res.status(201).json({
        success: true,
        message: '注册成功',
        data: {
          user: userRecord,
          needEmailVerification: !authData.session // 如果没有session，说明需要邮箱验证
        }
      })
    } catch (dbError) {
      console.error('Create user record error:', dbError)
      return res.status(500).json({ 
        success: false,
        error: '用户注册成功，但创建用户记录失败',
        details: process.env.NODE_ENV === 'development' ? (dbError as Error).message : undefined
      })
    }

  } catch (error) {
    return handleApiError(res, error, 'Register')
  }
}