// STATIC GUARD: prod source must pass eslint with zero errors/warnings.
// Scans ALL .js/.jsx in src/ + shared/ (excl tests/mocks). Catches unused imports,
// dead code, undefined vars before they hit the browser console.
// Run via: npx eslint <files> --format json -> parse -> fail on any problem.
const { execSync } = require('child_process');
const path = require('path');
const fs = require('fs');

const ROOT = path.resolve(__dirname, '..', '..');

function walkJs(dir) {
  let out = [];
  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
    const full = path.join(dir, entry.name);
    if (entry.isDirectory()) {
      if (entry.name === 'node_modules' || entry.name === 'tests' || entry.name === '__mocks__') continue;
      out = out.concat(walkJs(full));
    } else if (/\.(js|jsx)$/.test(entry.name)) {
      out.push(full);
    }
  }
  return out;
}

const TARGETS = [
  ...walkJs(path.join(ROOT, 'src')),
  ...walkJs(path.join(ROOT, 'shared')),
];

function runEslint(files) {
  const abs = files.map(f => `"${path.join(ROOT, f)}"`).join(' ');
  // execSync throws on non-zero exit (eslint returns 1 when problems found).
  // Capture stdout regardless.
  let stdout;
  try {
    stdout = execSync(`npx eslint ${abs} --format json`, {
      encoding: 'utf8',
      cwd: ROOT,
      stdio: ['pipe', 'pipe', 'pipe'],
    });
  } catch (err) {
    stdout = err.stdout || '';
  }
  return JSON.parse(stdout || '[]');
}

describe('static guard: eslint clean on prod source', () => {
  test('zero eslint errors or warnings', () => {
    const results = runEslint(TARGETS);
    const problems = [];
    let totalErrors = 0;
    let totalWarnings = 0;
    for (const file of results) {
      totalErrors += file.errorCount;
      totalWarnings += file.warningCount;
      for (const msg of file.messages) {
        problems.push(`  ${path.relative(ROOT, file.filePath)}:${msg.line}:${msg.column} ${msg.ruleId} — ${msg.message}`);
      }
    }
    if (totalErrors + totalWarnings > 0) {
      const summary = `eslint found ${totalErrors} error(s), ${totalWarnings} warning(s):\n${problems.join('\n')}`;
      throw new Error(summary);
    }
  }, 30000); // eslint spawn can be slow
});