import { asc, desc, eq, inArray } from 'drizzle-orm'
import { commentAttachments, comments, uploads, users } from '../../db/schema'
import type { CommentAttachment } from '~~/shared/utils/attachments'

export default defineEventHandler(async () => {
  const db = useDb()
  const rows = await db
    .select({
      id: comments.id,
      content: comments.content,
      createdAt: comments.createdAt,
      userName: users.name,
      userId: users.id,
      userColor: users.color,
      userAvatar: users.avatar,
      uploadId: uploads.id,
    })
    .from(comments)
    .innerJoin(users, eq(comments.userId, users.id))
    .innerJoin(uploads, eq(comments.uploadId, uploads.id))
    .orderBy(desc(comments.createdAt))
    .limit(15)

  const commentIds = rows.map(r => r.id)
  const attachmentRows = commentIds.length
    ? await db
        .select()
        .from(commentAttachments)
        .where(inArray(commentAttachments.commentId, commentIds))
        .orderBy(asc(commentAttachments.id))
    : []
  const attachmentsByComment = new Map<number, CommentAttachment[]>()
  for (const a of attachmentRows) {
    let list = attachmentsByComment.get(a.commentId)
    if (!list) {
      list = []
      attachmentsByComment.set(a.commentId, list)
    }
    list.push({ id: a.id, name: a.originalName, url: `/uploads/attachments/${a.fileName}`, mimeType: a.mimeType, size: a.size, cover: a.cover, meta: a.meta as CommentAttachment['meta'] })
  }

  return rows.map(r => ({
    ...r,
    userAvatarUrl: avatarUrl(r.userAvatar),
    attachments: attachmentsByComment.get(r.id) ?? [],
  }))
})