import { createError, readBody } from 'h3'
import { z } from 'zod'
import { getUserById, isUsernameTaken, updateMemberProfile } from '../../repositories/member-repository'
import { requireMemberSession } from '../../utils/member-auth'
import { isManagedAvatarUrl, removeManagedAvatarAsset } from '../../utils/member-avatar'

const updateProfileSchema = z.object({
  username: z.string().trim().min(1).max(30),
  avatarUrl: z.string().trim().max(500).optional().default('')
})

/**
 * 회원 프로필 수정 API
 * @param {import('h3').H3Event} event - 요청 이벤트
 * @returns {Promise<{ id: string, email: string, username: string, avatarUrl: string }>} 수정된 회원 프로필
 */
export default defineEventHandler(async (event) => {
  const session = requireMemberSession(event)
  const parsedBody = updateProfileSchema.safeParse(await readBody(event))

  if (!parsedBody.success) {
    throw createError({
      statusCode: 400,
      message: '프로필 요청 형식이 올바르지 않습니다.'
    })
  }

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

  if (taken) {
    throw createError({
      statusCode: 409,
      message: '이미 사용 중인 닉네임입니다.'
    })
  }

  const existing = await getUserById(session.userId)

  if (!existing) {
    throw createError({
      statusCode: 404,
      message: '회원 정보를 찾을 수 없습니다.'
    })
  }

  const previousAvatarUrl = existing.avatarUrl || ''
  const nextAvatarUrl = parsedBody.data.avatarUrl || ''

  if (previousAvatarUrl && previousAvatarUrl !== nextAvatarUrl && isManagedAvatarUrl(previousAvatarUrl)) {
    await removeManagedAvatarAsset(previousAvatarUrl)
  }

  const updated = await updateMemberProfile({
    userId: session.userId,
    username: parsedBody.data.username,
    avatarUrl: nextAvatarUrl
  })

  if (!updated) {
    throw createError({
      statusCode: 404,
      message: '회원 정보를 찾을 수 없습니다.'
    })
  }

  const user = await getUserById(session.userId)
  if (!user) {
    throw createError({
      statusCode: 404,
      message: '회원 정보를 찾을 수 없습니다.'
    })
  }

  return {
    id: user.id,
    email: user.email,
    username: user.username,
    avatarUrl: user.avatarUrl || ''
  }
})