import { query, execute, queryOne } from '../../../utils/db'

/**
 * 개선의견 공감 토글
 * POST /api/feedback/[id]/like
 */
export default defineEventHandler(async (event) => {
  const userId = getCookie(event, 'user_id')
  if (!userId) {
    throw createError({ statusCode: 401, message: '로그인이 필요합니다.' })
  }
  
  const feedbackId = getRouterParam(event, 'id')
  if (!feedbackId) {
    throw createError({ statusCode: 400, message: '피드백 ID가 필요합니다.' })
  }
  
  // 피드백 존재 확인
  const feedback = await query<any>(`
    SELECT feedback_id FROM wr_feedback WHERE feedback_id = $1
  `, [feedbackId])
  
  if (!feedback[0]) {
    throw createError({ statusCode: 404, message: '의견을 찾을 수 없습니다.' })
  }
  
  // 이미 공감했는지 확인
  const existing = await query<any>(`
    SELECT 1 FROM wr_feedback_like WHERE feedback_id = $1 AND employee_id = $2
  `, [feedbackId, userId])
  
  let isLiked: boolean
  let likeCount: number
  
  if (existing[0]) {
    // 공감 취소
    await execute(`
      DELETE FROM wr_feedback_like WHERE feedback_id = $1 AND employee_id = $2
    `, [feedbackId, userId])
    await execute(`
      UPDATE wr_feedback SET like_count = like_count - 1 WHERE feedback_id = $1
    `, [feedbackId])
    isLiked = false
  } else {
    // 공감 추가
    await execute(`
      INSERT INTO wr_feedback_like (feedback_id, employee_id) VALUES ($1, $2)
    `, [feedbackId, userId])
    await execute(`
      UPDATE wr_feedback SET like_count = like_count + 1 WHERE feedback_id = $1
    `, [feedbackId])
    isLiked = true
  }
  
  // 최신 카운트 조회
  const updated = await queryOne<any>(`
    SELECT like_count FROM wr_feedback WHERE feedback_id = $1
  `, [feedbackId])
  likeCount = updated.like_count
  
  return {
    success: true,
    isLiked,
    likeCount
  }
})