/*!
 * @license
 * Copyright 2019 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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

@Injectable({
    providedIn: 'root'
})
export class CookieService {

    cookieEnabled = false;

    constructor() {
        // for certain scenarios Chrome may say 'true' but have cookies still disabled
        if (navigator.cookieEnabled === false) {
            this.cookieEnabled = false;
        }

        this.setItem('test-cookie', 'test');
        this.cookieEnabled = document.cookie.indexOf('test-cookie') >= 0;
        this.deleteCookie('test-cookie');
    }

    /**
     * Checks if cookies are enabled.
     * @returns True if enabled, false otherwise
     */
    isEnabled(): boolean {
        return this.cookieEnabled;
    }

    /**
     * Retrieves a cookie by its key.
     * @param key Key to identify the cookie
     * @returns The cookie data or null if it is not found
     */
    getItem(key: string): string | null {
        const regexp = new RegExp('(?:' + key + '|;\s*' + key + ')=(.*?)(?:;|$)', 'g');
        const result = regexp.exec(document.cookie);
        return (result === null) ? null : result[1];
    }

    /**
     * Sets a cookie.
     * @param key Key to identify the cookie
     * @param data Data value to set for the cookie
     * @param expiration Expiration date of the data
     * @param path "Pathname" to store the cookie
     */
    setItem(key: string, data: string, expiration: Date | null = null, path: string | null = null): void {
        document.cookie = `${key}=${data}` +
            (expiration ? ';expires=' + expiration.toUTCString() : '') +
            (path ? `;path=${path}` : ';path=/');
    }

    /**
     * Delete a cookie Key.
     * @param key Key to identify the cookie
     * @param path "Pathname" to store the cookie
     */
    deleteCookie(key: string, path: string | null = null): void {
        document.cookie = key + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;' +
            (path ? `;path=${path}` : ';path=/');
    }

    /** Placeholder for testing purposes - do not use. */
    clear() {
        /* placeholder for testing purposes */
    }
}