/**
 * Synology SSO Access Token 검증 및 로그인 처리
 * POST /api/auth/synology/verify
 */
import { queryOne, execute } from '~/server/utils/db'
import { createSession } from '~/server/utils/session'
import { getClientIp } from '~/server/utils/ip'

export default defineEventHandler(async (event) => {
  const body = await readBody(event)
  const { accessToken } = body
  const ip = getClientIp(event)
  
  if (!accessToken) {
    throw createError({
      statusCode: 400,
      message: 'Access token이 없습니다.'
    })
  }
  
  const config = useRuntimeConfig()
  
  console.log('[Synology SSO] Access Token:', accessToken)
  
  try {
    // 1. 액세스 토큰으로 사용자 정보 조회
    const userInfoUrl = `${config.synologyServerUrl}/webman/sso/SSOUserInfo.cgi`
    
    console.log('[Synology SSO] Requesting user info...')
    
    let userResponse = await $fetch<any>(userInfoUrl, {
      method: 'GET',
      headers: {
        'Authorization': `Bearer ${accessToken}`
      }
    })
    
    // 문자열로 온 경우 JSON 파싱
    if (typeof userResponse === 'string') {
      userResponse = JSON.parse(userResponse)
    }
    
    console.log('[Synology SSO] User Response:', JSON.stringify(userResponse, null, 2))
    
    if (!userResponse.data || !userResponse.data.email) {
      // email이 없으면 SSOAccessToken.cgi로 시도
      const tokenInfoUrl = `${config.synologyServerUrl}/webman/sso/SSOAccessToken.cgi?action=exchange&access_token=${accessToken}&app_id=${config.synologyClientId}`
      
      let tokenResponse = await $fetch<any>(tokenInfoUrl)
      if (typeof tokenResponse === 'string') {
        tokenResponse = JSON.parse(tokenResponse)
      }
      
      console.log('[Synology SSO] Token Response:', JSON.stringify(tokenResponse, null, 2))
      
      if (!tokenResponse.success) {
        throw createError({
          statusCode: 401,
          message: 'Synology 사용자 정보를 가져올 수 없습니다.'
        })
      }
      
      // user_name으로 사용자 조회
      const synologyUsername = tokenResponse.data?.user_name
      
      if (!synologyUsername) {
        throw createError({
          statusCode: 401,
          message: 'Synology 사용자명을 가져올 수 없습니다.'
        })
      }
      
      console.log('[Synology SSO] Username:', synologyUsername)
      
      // synology_id나 email의 앞부분으로 매칭 시도
      const synologyEmail = `${synologyUsername}@osolit.net`
      
      const employee = await queryOne<any>(`
        SELECT employee_id, employee_name, is_active, password_hash,
               synology_id, synology_email, employee_email
        FROM wr_employee_info 
        WHERE synology_id = $1 
           OR employee_email = $2
      `, [synologyUsername, synologyEmail])
      
      if (!employee) {
        throw createError({
          statusCode: 404,
          message: `Synology 계정 "${synologyUsername}"과 연결된 사용자를 찾을 수 없습니다. 관리자에게 문의하세요.`
        })
      }
      
      if (!employee.is_active) {
        throw createError({
          statusCode: 403,
          message: '비활성화된 계정입니다.'
        })
      }
      
      // 로그인 이력 기록
      await execute(`
        INSERT INTO wr_login_history (employee_id, login_type, login_ip, login_at, login_success, login_email)
        VALUES ($1, 'SYNOLOGY', $2, NOW(), true, $3)
      `, [employee.employee_id, ip, synologyUsername])
      
      // 세션 생성
      await createSession(event, employee.employee_id)
      
      return {
        success: true,
        needPasswordSet: !employee.password_hash
      }
    }
    
    // 이메일이 있는 경우
    const synologyEmail = userResponse.data.email
    const synologyId = userResponse.data.user_id || userResponse.data.uid
    
    console.log('[Synology SSO] Email:', synologyEmail)
    
    // 이메일로 사용자 매칭
    const employee = await queryOne<any>(`
      SELECT employee_id, employee_name, is_active, password_hash,
             synology_id, synology_email
      FROM wr_employee_info 
      WHERE employee_email = $1
    `, [synologyEmail])
    
    if (!employee) {
      throw createError({
        statusCode: 404,
        message: '등록되지 않은 사용자입니다. 관리자에게 문의하세요.'
      })
    }
    
    if (!employee.is_active) {
      throw createError({
        statusCode: 403,
        message: '비활성화된 계정입니다.'
      })
    }
    
    // Synology 계정 연결 정보 업데이트
    await execute(`
      UPDATE wr_employee_info 
      SET synology_id = $1, synology_email = $2, synology_linked_at = NOW()
      WHERE employee_id = $3
    `, [synologyId, synologyEmail, employee.employee_id])
    
    // 로그인 이력 기록
    await execute(`
      INSERT INTO wr_login_history (employee_id, login_type, login_ip, login_at, login_success, login_email)
      VALUES ($1, 'SYNOLOGY', $2, NOW(), true, $3)
    `, [employee.employee_id, ip, synologyEmail])
    
    // 세션 생성
    await createSession(event, employee.employee_id)
    
    return {
      success: true,
      needPasswordSet: !employee.password_hash
    }
    
  } catch (error: any) {
    console.error('[Synology SSO] Error:', error)
    if (error.statusCode) {
      throw error
    }
    throw createError({
      statusCode: 500,
      message: 'Synology 로그인 처리 중 오류가 발생했습니다.'
    })
  }
})