/**
 * Scenario Test Runner
 * Validates that rendered events match expected layout
 */

export class ScenarioTestRunner {
  /**
   * Validate a scenario's rendered output
   * @param {string} scenarioId - e.g., "scenario-1"
   * @param {Array} expectedResults - Array of {eventId, stackLevel, cols?, type: 'grid'|'stacked'}
   * @returns {object} - {passed: boolean, results: Array, message: string}
   */
  static validateScenario(scenarioId, expectedResults) {
    const results = [];
    let allPassed = true;

    for (const expected of expectedResults) {
      const result = this.validateEvent(expected.eventId, expected);
      results.push(result);
      if (!result.passed) {
        allPassed = false;
      }
    }

    return {
      passed: allPassed,
      results,
      message: allPassed ? 'All tests passed ✅' : 'Some tests failed ❌'
    };
  }

  /**
   * Validate a single event
   */
  static validateEvent(eventId, expected) {
    const eventEl = document.querySelector(`swp-event[data-event-id="${eventId}"]`);

    if (!eventEl) {
      return {
        passed: false,
        eventId,
        message: `Event ${eventId} not found in DOM`
      };
    }

    const errors = [];

    // Check if in grid group
    const gridGroup = eventEl.closest('swp-event-group');

    if (expected.type === 'grid') {
      if (!gridGroup) {
        errors.push(`Expected to be in grid group, but found as stacked event`);
      } else {
        // Validate grid group properties
        const groupStackLevel = this.getStackLevel(gridGroup);
        if (groupStackLevel !== expected.stackLevel) {
          errors.push(`Grid group stack level: expected ${expected.stackLevel}, got ${groupStackLevel}`);
        }

        if (expected.cols) {
          const cols = this.getColumnCount(gridGroup);
          if (cols !== expected.cols) {
            errors.push(`Grid columns: expected ${expected.cols}, got ${cols}`);
          }
        }
      }
    } else if (expected.type === 'stacked') {
      if (gridGroup) {
        errors.push(`Expected to be stacked, but found in grid group`);
      } else {
        // Validate stacked event properties
        const stackLevel = this.getStackLevel(eventEl);
        if (stackLevel !== expected.stackLevel) {
          errors.push(`Stack level: expected ${expected.stackLevel}, got ${stackLevel}`);
        }
      }
    }

    return {
      passed: errors.length === 0,
      eventId,
      message: errors.length === 0 ? '✅' : errors.join('; ')
    };
  }

  /**
   * Get stack level from element
   */
  static getStackLevel(element) {
    const stackLink = element.getAttribute('data-stack-link');
    if (stackLink) {
      try {
        const parsed = JSON.parse(stackLink);
        return parsed.stackLevel;
      } catch (e) {
        return null;
      }
    }

    // Try class name fallback
    const classMatch = element.className.match(/stack-level-(\d+)/);
    return classMatch ? parseInt(classMatch[1]) : null;
  }

  /**
   * Get column count from grid group
   */
  static getColumnCount(gridGroup) {
    const classMatch = gridGroup.className.match(/cols-(\d+)/);
    return classMatch ? parseInt(classMatch[1]) : null;
  }

  /**
   * Display test results in the DOM
   */
  static displayResults(containerId, results) {
    const container = document.getElementById(containerId);
    if (!container) return;

    const badge = document.createElement('span');
    badge.className = `test-badge ${results.passed ? 'test-passed' : 'test-failed'}`;
    badge.textContent = results.message;
    container.appendChild(badge);

    // Add detailed results
    const details = document.createElement('div');
    details.className = 'test-details';
    details.innerHTML = '<h4>Test Results:</h4>';

    results.results.forEach(r => {
      const line = document.createElement('div');
      line.className = `test-result-line ${r.passed ? 'passed' : 'failed'}`;
      line.textContent = `${r.eventId}: ${r.message}`;
      details.appendChild(line);
    });

    container.appendChild(details);
  }
}

// Auto-run tests if window.scenarioTests is defined
window.addEventListener('DOMContentLoaded', () => {
  if (window.scenarioTests) {
    const results = ScenarioTestRunner.validateScenario(
      window.scenarioTests.id,
      window.scenarioTests.expected
    );

    ScenarioTestRunner.displayResults('test-results', results);
  }
});