/**
 * API endpoint for listing files and directories in a repository
 */

import { json, error } from '@sveltejs/kit';
import type { RequestHandler } from './$types';
import { FileManager } from '$lib/services/git/file-manager.js';
import { MaintainerService } from '$lib/services/nostr/maintainer-service.js';
import { DEFAULT_NOSTR_RELAYS } from '$lib/config.js';
import { nip19 } from 'nostr-tools';
import { requireNpubHex } from '$lib/utils/npub-utils.js';
import { handleApiError, handleValidationError, handleNotFoundError, handleAuthorizationError } from '$lib/utils/error-handler.js';

const repoRoot = process.env.GIT_REPO_ROOT || '/repos';
const fileManager = new FileManager(repoRoot);
const maintainerService = new MaintainerService(DEFAULT_NOSTR_RELAYS);

export const GET: RequestHandler = async ({ params, url, request }) => {
  const { npub, repo } = params;
  const ref = url.searchParams.get('ref') || 'HEAD';
  const path = url.searchParams.get('path') || '';
  const userPubkey = url.searchParams.get('userPubkey') || request.headers.get('x-user-pubkey');

  if (!npub || !repo) {
    return handleValidationError('Missing npub or repo parameter', { operation: 'listFiles' });
  }

  try {
    if (!fileManager.repoExists(npub, repo)) {
      return handleNotFoundError('Repository not found', { operation: 'listFiles', npub, repo });
    }

    // Check repository privacy
    let repoOwnerPubkey: string;
    try {
      repoOwnerPubkey = requireNpubHex(npub);
    } catch {
      return handleValidationError('Invalid npub format', { operation: 'listFiles', npub });
    }

    const canView = await maintainerService.canView(userPubkey || null, repoOwnerPubkey, repo);
    if (!canView) {
      return handleAuthorizationError('This repository is private. Only owners and maintainers can view it.', { operation: 'listFiles', npub, repo });
    }

    const files = await fileManager.listFiles(npub, repo, ref, path);
    return json(files);
  } catch (err) {
    return handleApiError(err, { operation: 'listFiles', npub, repo, path, ref }, 'Failed to list files');
  }
};