const fs = require('fs');

class CustomReporter {
  onEnd(config, result) {
    const outputPath = 'tests/output/latest-result.txt';

    if (!result) {
      // test run aborted or failed to initialize
      if (!fs.existsSync('tests/output')) fs.mkdirSync('tests/output', { recursive: true });
      fs.writeFileSync(outputPath, 'TEST RUN FAILED OR ABORTED', 'utf-8');
      return;
    }

    const failed = result.status === 'failed' || result.numFailedTests > 0;

    const date = new Date().toISOString();
    const duration = (result.duration || 0) + 'ms';

    if (!fs.existsSync('tests/output')) fs.mkdirSync('tests/output', { recursive: true });

    if (!failed) {
      const content = [
        '==================================',
        'TEST RESULT',
        'PASSED',
        `Date: ${date}`,
        `Total Test: ${result.total || 0}`,
        `Passed: ${result.passed || 0}`,
        `Failed: ${result.failed || 0}`,
        `Duration: ${duration}`,
        '==================================',
      ].join('\n');

      fs.writeFileSync(outputPath, content, 'utf-8');
      return;
    }

    const lines = [];
    lines.push('==================================');
    lines.push('FAILED');
    lines.push(`Date: ${date}`);
    lines.push(`Duration: ${duration}`);
    lines.push('==================================');

    const buildFailureDetails = (suites) => {
      for (const s of suites) {
        if (s.suites && s.suites.length) buildFailureDetails(s.suites);
        if (s.tests && s.tests.length) {
          for (const t of s.tests) {
            if (t.status === 'failed') {
              lines.push('Test Name: ' + (t.title || t.titleText || ''));             
              for (const r of t.results || []) {
                if (r.status === 'failed') {
                  const error = r.error || {};
                  lines.push('Error Message: ' + (error.message || ''));
                  if (error.stack) lines.push('Stack Trace: ' + error.stack);
                }
              }
              lines.push('----------------------------------');
            }
          }
        }
      }
    };

    if (result.suites) buildFailureDetails(result.suites);

    fs.writeFileSync(outputPath, lines.join('\n'), 'utf-8');
  }
}

module.exports = CustomReporter;