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

import {
    DOCUMENT,
} from '@angular/common';

@Injectable()
export class QueryStringService {
    constructor(
        @Inject('window')
        private _window: Window,
        @Inject(DOCUMENT)
        private _document: Document,
    ) {}

    public getQueryStringKey(name: string) {
        const search = this._window.location.search;
        const processedName = name.replace(/[\[\]]/g, '\\$&');
        const regex = new RegExp('[?&]' + processedName + '(=([^&#]*)|&|#|$)');
        const [ fullQuery, queryValueWithEquals, queryValue ] =
            regex.exec(search) || [null, null, null];
        return queryValue ?
            decodeURIComponent(queryValue.replace(/\+/g, ' '))
            :
            null;
    }

    public clearQueryStrings() {
        const location = this._window.location;
        if (location.search) {
            this._window.history.replaceState(
                {},
                this._document.title,
                location.origin +
                    location.pathname +
                    location.hash,
            );
        }
    }

    public convertPropertyNameToQueryStringKey(objectKey: string) {
        return objectKey.replace(/([A-Z])/g, (g) => `-${g[0].toLowerCase()}`);
    }
}