import { spawnSync } from 'node:child_process';
import { existsSync, readdirSync, readFileSync, statSync } from 'node:fs';
import { parseCapabilityAllowlist, releaseIdIsImmutable } from '../src/lib/server/release-gate';

const RELEASE_ENVIRONMENTS = new Set(['fixture', 'development', 'staging', 'production']);
const DIGEST_IMAGE = /@sha256:[a-f0-9]{64}$/i;

type ReleaseCheckInput = {
  mode: string;
  releaseId: string;
  releaseEnvironment: string;
  dashboardImage: string;
  convexImage: string;
  dockerfile: string;
  capabilityAllowlist: string | undefined;
  trackedFiles: readonly string[];
  browserBundleFiles?: readonly string[];
  browserBundlePresent?: boolean;
};

export function releaseSafetyErrors(input: ReleaseCheckInput): string[] {
  const errors: string[] = [];
  try { parseCapabilityAllowlist(input.capabilityAllowlist); }
  catch (error) { errors.push(error instanceof Error ? error.message : 'Invalid capability allowlist'); }
  if (!RELEASE_ENVIRONMENTS.has(input.releaseEnvironment)) {
    errors.push('RELEASE_ENV must be explicitly set to fixture, development, staging, or production');
  }

  const strictEnvironment = input.releaseEnvironment === 'production' || input.releaseEnvironment === 'staging';
  if (!releaseIdIsImmutable(input.releaseId, strictEnvironment ? 'production' : 'development')) {
    errors.push('APP_RELEASE_ID must be a non-placeholder immutable identifier for this release environment');
  }
  if (strictEnvironment && !DIGEST_IMAGE.test(input.dashboardImage)) {
    errors.push('CONVEX_DASHBOARD_IMAGE must be digest-pinned for staging/production');
  }
  if (strictEnvironment && !DIGEST_IMAGE.test(input.convexImage)) {
    errors.push('CONVEX_IMAGE must be digest-pinned for staging/production');
  }
  if (strictEnvironment && input.browserBundlePresent === false) {
    errors.push('built browser client artifacts are required for staging/production release checks');
  }
  if (strictEnvironment) {
    const baseImages = [...input.dockerfile.matchAll(/^FROM\s+([^\s]+)(?:\s+AS\s+[^\s]+)?$/gim)].map((match) => match[1]);
    if (baseImages.length === 0 || baseImages.some((image) => !DIGEST_IMAGE.test(image))) {
      errors.push('Dockerfile base images must be digest-pinned for staging/production');
    }
  }
  if (input.mode === 'demo' && strictEnvironment) {
    errors.push('APP_MODE=demo is not permitted for a staging/production release');
  }
  for (const file of input.trackedFiles) {
    if (/(^|\/)(?:\.env(?:\.|$)|.*\.(?:pem|key|p12|pfx)$|(?:credentials|secrets)(?:\.(?:json|ya?ml|env|txt)|$)|\.npmrc$)/i.test(file) && file !== '.env.example') {
      errors.push(`secret-like file is tracked: ${file}`);
    }
  }
  if ((input.browserBundleFiles ?? []).length > 0) {
    errors.push('browser client artifacts contain managed secret names');
  }
  return errors;
}

function trackedFiles(): string[] {
  const result = spawnSync('git', ['ls-files'], { encoding: 'utf8' });
  if (result.status !== 0) throw new Error('Unable to inspect tracked files');
  return result.stdout.split('\n').filter(Boolean);
}

const MANAGED_SECRET_NAMES = ['TOKEN_ENCRYPTION_KEY', 'CONVEX_BRIDGE_SECRET', 'CONVEX_SYNC_WORKER_SECRET', 'APP_AUTH_PRIVATE_KEY', 'TYPESAFE_API_KEY', 'refresh_token'];
function browserBundleFiles(directory = 'build/client'): string[] {
  try { statSync(directory); } catch { return []; }
  const files: string[] = [];
  const visit = (path: string) => {
    for (const entry of readdirSync(path, { withFileTypes: true })) {
      const child = `${path}/${entry.name}`;
      if (entry.isDirectory()) visit(child);
      else if (entry.isFile()) {
        const source = readFileSync(child, 'utf8');
        if (MANAGED_SECRET_NAMES.some((name) => source.includes(name))) files.push(child);
      }
    }
  };
  visit(directory);
  return files;
}

if (import.meta.main) {
  const releaseEnvironment = process.env.RELEASE_ENV ?? (process.env.APP_MODE === 'demo' ? 'fixture' : '');
  const errors = releaseSafetyErrors({
    mode: process.env.APP_MODE ?? 'live',
    releaseId: process.env.APP_RELEASE_ID ?? 'local',
    releaseEnvironment,
    dashboardImage: process.env.CONVEX_DASHBOARD_IMAGE ?? '',
    convexImage: process.env.CONVEX_IMAGE ?? '',
    dockerfile: readFileSync(new URL('../Dockerfile', import.meta.url), 'utf8'),
    capabilityAllowlist: process.env.APP_CAPABILITY_ALLOWLIST,
    trackedFiles: trackedFiles(),
    browserBundleFiles: browserBundleFiles(),
    browserBundlePresent: existsSync('build/client'),
  });
  if (errors.length) {
    console.error(`Release safety check failed (${errors.length} issue${errors.length === 1 ? '' : 's'})`);
    for (const message of errors) console.error(`- ${message}`);
    process.exitCode = 1;
  } else {
    const capabilities = parseCapabilityAllowlist(process.env.APP_CAPABILITY_ALLOWLIST).join(',') || 'none';
    console.log(`Release safety check passed: environment=${releaseEnvironment}, mode=${process.env.APP_MODE ?? 'live'}, capabilities=${capabilities}`);
  }
}