/**
 * Browser compatibility checking utilities
 */

export interface BrowserCompatibility {
  isSupported: boolean;
  missingFeatures: string[];
  warnings: string[];
}

/**
 * Check if all required browser features are supported
 */
export function checkBrowserCompatibility(): BrowserCompatibility {
  const missingFeatures: string[] = [];
  const warnings: string[] = [];

  // Check if running in browser
  if (typeof window === 'undefined') {
    return {
      isSupported: true,
      missingFeatures: [],
      warnings: [],
    };
  }

  // Check Web Audio API
  if (!window.AudioContext && !(window as any).webkitAudioContext) {
    missingFeatures.push('Web Audio API');
  }

  // Check IndexedDB
  if (!window.indexedDB) {
    missingFeatures.push('IndexedDB');
  }

  // Check localStorage
  try {
    localStorage.setItem('test', 'test');
    localStorage.removeItem('test');
  } catch (e) {
    missingFeatures.push('LocalStorage');
  }

  // Check Canvas API
  const canvas = document.createElement('canvas');
  if (!canvas.getContext || !canvas.getContext('2d')) {
    missingFeatures.push('Canvas API');
  }

  // Check MediaDevices API (for recording)
  if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
    warnings.push('Microphone recording not supported (requires HTTPS or localhost)');
  }

  // Check File API
  if (!window.File || !window.FileReader || !window.FileList || !window.Blob) {
    missingFeatures.push('File API');
  }

  // Check AudioWorklet support (optional)
  if (window.AudioContext && !AudioContext.prototype.hasOwnProperty('audioWorklet')) {
    warnings.push('AudioWorklet not supported (some features may have higher latency)');
  }

  // Check OfflineAudioContext
  if (!window.OfflineAudioContext && !(window as any).webkitOfflineAudioContext) {
    missingFeatures.push('OfflineAudioContext (required for audio processing)');
  }

  return {
    isSupported: missingFeatures.length === 0,
    missingFeatures,
    warnings,
  };
}

/**
 * Get user-friendly browser name
 */
export function getBrowserInfo(): { name: string; version: string } {
  // Check if running in browser
  if (typeof window === 'undefined' || typeof navigator === 'undefined') {
    return { name: 'Unknown', version: 'Unknown' };
  }

  const userAgent = navigator.userAgent;
  let name = 'Unknown';
  let version = 'Unknown';

  if (userAgent.indexOf('Chrome') > -1 && userAgent.indexOf('Edg') === -1) {
    name = 'Chrome';
    const match = userAgent.match(/Chrome\/(\d+)/);
    version = match ? match[1] : 'Unknown';
  } else if (userAgent.indexOf('Edg') > -1) {
    name = 'Edge';
    const match = userAgent.match(/Edg\/(\d+)/);
    version = match ? match[1] : 'Unknown';
  } else if (userAgent.indexOf('Firefox') > -1) {
    name = 'Firefox';
    const match = userAgent.match(/Firefox\/(\d+)/);
    version = match ? match[1] : 'Unknown';
  } else if (userAgent.indexOf('Safari') > -1 && userAgent.indexOf('Chrome') === -1) {
    name = 'Safari';
    const match = userAgent.match(/Version\/(\d+)/);
    version = match ? match[1] : 'Unknown';
  }

  return { name, version };
}

/**
 * Check if browser version meets minimum requirements
 */
export function checkMinimumVersion(): boolean {
  const { name, version } = getBrowserInfo();
  const versionNum = parseInt(version, 10);

  const minimumVersions: Record<string, number> = {
    Chrome: 90,
    Edge: 90,
    Firefox: 88,
    Safari: 14,
  };

  const minVersion = minimumVersions[name];
  if (!minVersion) {
    // Unknown browser, assume it's ok
    return true;
  }

  return versionNum >= minVersion;
}