import { describe, test, expect } from 'bun:test';
import * as fs from 'fs';
import * as path from 'path';

const ROOT = path.resolve(import.meta.dir, '..');
const PKG = JSON.parse(fs.readFileSync(path.join(ROOT, 'package.json'), 'utf-8')) as {
  scripts: Record<string, string>;
};
const BUILD_SCRIPT = fs.readFileSync(path.join(ROOT, 'scripts', 'build.sh'), 'utf-8');

// Strip single-quoted strings so JS code emitted as `echo '{ ... }'` doesn't
// trip the shell-brace-group check. Conservative: only `'...'` segments.
function stripSingleQuoted(s: string): string {
  return s.replace(/'[^']*'/g, "''");
}

describe('package.json build scripts — POSIX shell compat (D-1460)', () => {
  // Bun's Windows shell parser doesn't grok bash brace groups `{ cmd; }`.
  // Bun 1.3.x on Windows also rejects subshells when the subshell or the
  // command inside it uses redirection, so redirected commands must be direct.
  test('no bash brace groups in any npm script', () => {
    const offending: { script: string; pattern: string }[] = [];
    for (const [name, body] of Object.entries(PKG.scripts)) {
      const stripped = stripSingleQuoted(body);
      const match = stripped.match(/\{\s+[^}]*;\s*\}/);
      if (match) {
        offending.push({ script: name, pattern: match[0] });
      }
    }
    expect(offending).toEqual([]);
  });

  test('build script has no subshells with redirections', () => {
    const offending: { script: string; pattern: string }[] = [];
    for (const [name, body] of Object.entries({ build: PKG.scripts.build ?? '' })) {
      const matches = [
        ...body.matchAll(/\([^)]*[<>][^)]*\)/g),
        ...body.matchAll(/\([^)]*\)\s*[<>]/g),
      ];
      for (const match of matches) {
        offending.push({ script: name, pattern: match[0] });
      }
    }
    expect(offending).toEqual([]);
  });

  test('build script delegates .version writes to a shell script', () => {
    // Bun rejects `( git ... ) > path/.version`.
    const build = PKG.scripts.build ?? '';
    expect(build).not.toMatch(/>\s*\S+\/\.version/);
    expect(build).toBe('bash scripts/build.sh');
    expect(BUILD_SCRIPT).toContain('bash scripts/write-version-files.sh');
  });
});