import { and, eq } from 'drizzle-orm';
import { NextRequest, NextResponse } from 'next/server';
import { announcements } from '@/db/schema';
import { getAnnouncementByIdForAccess } from '@/features/announcements/server/announcement-data';
import { readStoredAnnouncementAttachment } from '@/lib/announcement-storage';
import { AuthError, requireOrganizationAccess } from '@/lib/auth/session';
import { db } from '@/lib/db';

type Params = { params: Promise<{ id: string }> };

export const runtime = 'nodejs';

export async function GET(_request: NextRequest, { params }: Params) {
  try {
    const { organization, session } = await requireOrganizationAccess();
    const { id } = await params;
    const announcementId = Number(id);

    if (Number.isNaN(announcementId)) {
      return NextResponse.json({ message: 'Invalid announcement request' }, { status: 400 });
    }

    const announcement = await getAnnouncementByIdForAccess({
      id: announcementId,
      organizationId: organization.id,
      permissions: session.user.effectivePermissions
    });

    if (!announcement || !announcement.attachmentStorageKey) {
      return NextResponse.json({ message: 'ไม่พบไฟล์แนบประกาศ' }, { status: 404 });
    }

    const persisted = await db.query.announcements.findFirst({
      where: and(
        eq(announcements.id, announcementId),
        eq(announcements.organizationId, organization.id)
      )
    });

    if (!persisted?.attachmentStorageKey || !persisted.attachmentFileType || !persisted.attachmentFileName) {
      return NextResponse.json({ message: 'ไม่พบไฟล์แนบประกาศ' }, { status: 404 });
    }

    const file = await readStoredAnnouncementAttachment(persisted.attachmentStorageKey);
    const disposition =
      persisted.attachmentFileType === 'application/pdf' ||
      persisted.attachmentFileType.startsWith('image/')
        ? 'inline'
        : 'attachment';

    return new NextResponse(file, {
      headers: {
        'Content-Type': persisted.attachmentFileType,
        'Content-Length': String(persisted.attachmentFileSize ?? file.byteLength),
        'Content-Disposition': `${disposition}; filename*=UTF-8''${encodeURIComponent(persisted.attachmentFileName)}`,
        'Cache-Control': 'private, no-store'
      }
    });
  } catch (error) {
    if (error instanceof AuthError) {
      return NextResponse.json({ message: error.message }, { status: error.status });
    }

    if ((error as NodeJS.ErrnoException)?.code === 'ENOENT') {
      return NextResponse.json({ message: 'ไม่พบไฟล์แนบประกาศ' }, { status: 404 });
    }

    return NextResponse.json({ message: 'ไม่สามารถเปิดไฟล์แนบประกาศได้' }, { status: 500 });
  }
}