import { NextRequest, NextResponse } from 'next/server';
import { createClient } from '@/lib/supabase/server';
import { isAgencyRole, userRole } from '@/lib/agency';
import { resolveActiveTenant } from '@/lib/tenant-context';
import {
  getDriveDownloadUrl,
  getTenantDriveFolderId,
  listFilesInFolder,
} from '@/lib/google-drive';

export const dynamic = 'force-dynamic';

/** GET — list Drive files for active tenant folder (or ?download=fileId). */
export async function GET(req: NextRequest) {
  const supabase = await createClient();
  const {
    data: { user },
  } = await supabase.auth.getUser();
  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  const ctx = await resolveActiveTenant(user);
  if (!ctx.tenantId || ctx.portfolioWide) {
    return NextResponse.json(
      { error: 'Selecciona un cliente en Contexto' },
      { status: 400 }
    );
  }

  // Clients only see own tenant; agency via view cookie already in ctx
  const agency = isAgencyRole(userRole(user));
  if (!agency) {
    // resolveActiveTenant already scopes to home tenant
  }

  const downloadId = req.nextUrl.searchParams.get('download')?.trim();
  if (downloadId) {
    try {
      const url = await getDriveDownloadUrl(downloadId);
      return NextResponse.json({ url });
    } catch (e) {
      return NextResponse.json(
        { error: e instanceof Error ? e.message : 'download failed' },
        { status: 500 }
      );
    }
  }

  const link = await getTenantDriveFolderId(ctx.tenantId);
  if (!link) {
    return NextResponse.json({
      files: [],
      linked: false,
      warning:
        'Sin carpeta Drive enlazada. Conecta marketing@ en Agencia y ejecuta auto-match.',
    });
  }

  try {
    const files = await listFilesInFolder(link.folderId);
    return NextResponse.json({
      linked: true,
      folderId: link.folderId,
      folderName: link.folderName,
      files: files.map((f) => ({
        id: f.id,
        name: f.name,
        mimeType: f.mimeType,
        bytes: f.size ? Number(f.size) : null,
        modifiedTime: f.modifiedTime,
        webViewLink: f.webViewLink,
        source: 'drive' as const,
      })),
    });
  } catch (e) {
    return NextResponse.json({
      linked: true,
      folderId: link.folderId,
      folderName: link.folderName,
      files: [],
      warning: e instanceof Error ? e.message : 'Drive error',
    });
  }
}