import {
    Inject,
    Injectable,
} from '@angular/core';

import BrowserTypesEnum from './browser-types.enum';

@Injectable()
export default class BrowserDetectorService {
    private _browserType: BrowserTypesEnum;

    constructor(
        @Inject('window')
        private _window: Window,
    ) {
        this._browserType =
            this._getBrowserType();
    }

    public isFirefox() {
        return this._browserType ===
            BrowserTypesEnum.Firefox;
    }

    public isSafari() {
        return this._browserType ===
            BrowserTypesEnum.Safari;
    }

    public isChrome() {
        return this._browserType ===
            BrowserTypesEnum.Chrome;
    }

    private _getBrowserType() {
        const nativeWindow = this._window;
        if (nativeWindow.navigator.userAgent
            .match(/Firefox/)
        ) {
            return BrowserTypesEnum.Firefox;
        } else if (
            nativeWindow.navigator.userAgent.match(/Safari/) &&
            !nativeWindow.navigator.userAgent.match(/Chrome/)
        ) {
            return BrowserTypesEnum.Safari;
        }
        return BrowserTypesEnum.Chrome;
    }
}