import { OperatingSystem } from '@/domain/OperatingSystem';
import { DetectorBuilder } from './DetectorBuilder';
import { IBrowserOsDetector } from './IBrowserOsDetector';

export class BrowserOsDetector implements IBrowserOsDetector {
  private readonly detectors = BrowserDetectors;

  public detect(userAgent: string): OperatingSystem | undefined {
    if (!userAgent) {
      return undefined;
    }
    for (const detector of this.detectors) {
      const os = detector.detect(userAgent);
      if (os !== undefined) {
        return os;
      }
    }
    return undefined;
  }
}

// Reference: https://github.com/keithws/browser-report/blob/master/index.js#L304
const BrowserDetectors = [
  define(OperatingSystem.KaiOS, (b) => b
    .mustInclude('KAIOS')),
  define(OperatingSystem.ChromeOS, (b) => b
    .mustInclude('CrOS')),
  define(OperatingSystem.BlackBerryOS, (b) => b
    .mustInclude('BlackBerry')),
  define(OperatingSystem.BlackBerryTabletOS, (b) => b
    .mustInclude('RIM Tablet OS')),
  define(OperatingSystem.BlackBerry, (b) => b
    .mustInclude('BB10')),
  define(OperatingSystem.Android, (b) => b
    .mustInclude('Android').mustNotInclude('Windows Phone')),
  define(OperatingSystem.Android, (b) => b
    .mustInclude('Adr').mustNotInclude('Windows Phone')),
  define(OperatingSystem.iOS, (b) => b
    .mustInclude('like Mac OS X')),
  define(OperatingSystem.Linux, (b) => b
    .mustInclude('Linux').mustNotInclude('Android').mustNotInclude('Adr')),
  define(OperatingSystem.Windows, (b) => b
    .mustInclude('Windows').mustNotInclude('Windows Phone')),
  define(OperatingSystem.WindowsPhone, (b) => b
    .mustInclude('Windows Phone')),
  define(OperatingSystem.macOS, (b) => b
    .mustInclude('OS X').mustNotInclude('Android').mustNotInclude('like Mac OS X')),
];

function define(
  os: OperatingSystem,
  applyRules: (builder: DetectorBuilder) => DetectorBuilder,
): IBrowserOsDetector {
  const builder = new DetectorBuilder(os);
  applyRules(builder);
  return builder.build();
}