import { readFile, readdir, stat } from 'node:fs/promises';
import path from 'node:path';
import { fail, pass, repositoryRoot, sha256 } from './lib.mjs';

const manifestName = 'PHASE_11_PACKAGE_MANIFEST_v1.0.json';
const manifestPath = path.join(repositoryRoot, manifestName);
const excludedDirectories = new Set([
  '.git',
  '.next',
  'node_modules',
  'coverage',
  'playwright-report',
  'test-results',
]);
const excludedFiles = new Set([manifestName, 'tsconfig.tsbuildinfo']);

async function walk(directory) {
  const files = [];
  const entries = await readdir(directory, { withFileTypes: true });
  for (const entry of entries) {
    if (entry.isDirectory() && excludedDirectories.has(entry.name)) continue;
    const fullPath = path.join(directory, entry.name);
    if (entry.isDirectory()) {
      files.push(...(await walk(fullPath)));
      continue;
    }
    const relative = path.relative(repositoryRoot, fullPath).split(path.sep).join('/');
    if (!excludedFiles.has(relative)) files.push(relative);
  }
  return files;
}

const manifest = JSON.parse(await readFile(manifestPath, 'utf8'));
const failures = [];

if (manifest.project !== 'RentalDriveGo' || manifest.phase !== 11) {
  failures.push('Phase 11 manifest identity is invalid.');
}
if (!Array.isArray(manifest.files)) {
  failures.push('Manifest files property must be an array.');
} else if (manifest.file_count !== manifest.files.length) {
  failures.push(
    `Manifest file_count ${manifest.file_count} does not match ${manifest.files.length} entries.`,
  );
}

const listedPaths = new Set();
for (const entry of manifest.files ?? []) {
  if (
    typeof entry.path !== 'string' ||
    entry.path.length === 0 ||
    path.isAbsolute(entry.path) ||
    entry.path.split('/').includes('..')
  ) {
    failures.push(`Unsafe manifest path: ${String(entry.path)}`);
    continue;
  }
  if (listedPaths.has(entry.path)) {
    failures.push(`${entry.path}: duplicate manifest entry.`);
    continue;
  }
  listedPaths.add(entry.path);

  const filePath = path.join(repositoryRoot, entry.path);
  try {
    const details = await stat(filePath);
    if (!details.isFile()) failures.push(`${entry.path}: is not a regular file.`);
    if (details.size !== entry.bytes) failures.push(`${entry.path}: byte size changed.`);
    const digest = await sha256(filePath);
    if (digest !== entry.sha256) failures.push(`${entry.path}: SHA-256 changed.`);
  } catch {
    failures.push(`${entry.path}: file is missing.`);
  }
}

const actualPaths = new Set(await walk(repositoryRoot));
for (const actual of actualPaths) {
  if (!listedPaths.has(actual)) failures.push(`${actual}: unlisted repository file.`);
}
for (const listed of listedPaths) {
  if (!actualPaths.has(listed)) failures.push(`${listed}: listed but excluded or absent.`);
}

if (failures.length) fail(failures);
else {
  pass(`Phase 11 package manifest verifies ${listedPaths.size} repository files with no extras.`);
}