import { getClientIp } from '../../utils/ip'
import { createSession, setSessionCookie } from '../../utils/session'

interface LoginBody {
  email: string
  name: string
}

/**
 * 이메일+이름 로그인
 * POST /api/auth/login
 */
export default defineEventHandler(async (event) => {
  const body = await readBody<LoginBody>(event)
  const clientIp = getClientIp(event)
  const userAgent = getHeader(event, 'user-agent') || null
  
  if (!body.email || !body.name) {
    throw createError({ statusCode: 400, message: '이메일과 이름을 입력해주세요.' })
  }
  
  // 이메일 형식 검증
  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
  if (!emailRegex.test(body.email)) {
    throw createError({ statusCode: 400, message: '올바른 이메일 형식이 아닙니다.' })
  }
  
  const emailLower = body.email.toLowerCase()
  const nameTrimmed = body.name.trim()
  
  // 기존 직원 조회
  let employee = await query<any>(`
    SELECT * FROM wr_employee_info WHERE employee_email = $1
  `, [emailLower])
  
  let employeeData = employee[0]
  
  if (employeeData) {
    // 기존 직원 - 이름이 다르면 업데이트
    if (employeeData.employee_name !== nameTrimmed) {
      await execute(`
        UPDATE wr_employee_info 
        SET employee_name = $1, updated_at = NOW(), updated_ip = $2, updated_email = $3
        WHERE employee_id = $4
      `, [nameTrimmed, clientIp, emailLower, employeeData.employee_id])
      employeeData.employee_name = nameTrimmed
    }
  } else {
    // 신규 직원 자동 등록
    employeeData = await insertReturning(`
      INSERT INTO wr_employee_info (employee_name, employee_email, created_ip, created_email, updated_ip, updated_email)
      VALUES ($1, $2, $3, $2, $3, $2)
      RETURNING *
    `, [nameTrimmed, emailLower, clientIp])
  }
  
  // 로그인 이력 추가
  const loginHistory = await insertReturning(`
    INSERT INTO wr_login_history (employee_id, login_ip, login_email) 
    VALUES ($1, $2, $3)
    RETURNING history_id
  `, [employeeData.employee_id, clientIp, emailLower])
  
  // DB 기반 세션 생성
  const sessionId = await createSession(
    employeeData.employee_id,
    loginHistory.history_id,
    clientIp,
    userAgent
  )
  
  // 세션 쿠키 설정
  setSessionCookie(event, sessionId)
  
  return {
    success: true,
    user: {
      employeeId: employeeData.employee_id,
      employeeName: employeeData.employee_name,
      employeeEmail: employeeData.employee_email,
      employeePosition: employeeData.employee_position
    }
  }
})