import { createError } from 'h3'
import { isUsernameTaken } from '../../repositories/member-repository'
import { requireMemberSession } from '../../utils/member-auth'

/**
 * 사용자명 중복 확인 API
 * @param {import('h3').H3Event} event - 요청 이벤트
 * @returns {Promise<{ available: boolean }>} 사용 가능 여부
 */
export default defineEventHandler(async (event) => {
  const session = requireMemberSession(event)
  const rawUsername = getQuery(event).username
  const username = typeof rawUsername === 'string' ? rawUsername.trim() : ''

  if (!username) {
    throw createError({
      statusCode: 400,
      message: '닉네임을 입력해 주세요.'
    })
  }

  const taken = await isUsernameTaken({
    username,
    excludeUserId: session.userId
  })

  return {
    available: !taken
  }
})