import { UriFactory } from '../../Uri/UriFactory.js';
import { Http } from '../../Uri/Http.js';

/**
 * Tab manager class.
 *
 * @copyright  Dennis Eichhorn
 * @license    OMS License 1.0
 * @version    1.0.0
 * @since      1.0.0
 */
export class Tab {
    /**
     * @constructor
     *
     * @since 1.0.0
     */
    constructor (app)
    {
        this.app = app;
    };

    /**
     * Bind & rebind UI elements.
     *
     * @param {string} [id] Element id
     *
     * @return {void}
     *
     * @since  1.0.0
     */
    bind (id)
    {
        if (typeof id !== 'undefined') {
            const e = document.getElementById(id);

            if (e) {
                this.bindElement(e);
            }
        } else {
            const tabs = document.getElementsByClassName('tabview'),
            length = !tabs ? 0 : tabs.length;

            for (let i = 0; i < length; ++i) {
                this.bindElement(tabs[i]);
            }
        }
    };

    /**
     * Bind & rebind UI element.
     *
     * @param {Object} e Element
     *
     * @return {void}
     *
     * @since  1.0.0
     */
    bindElement (e)
    {
        const nodes = e.querySelectorAll('.tab-links li'),
            length = nodes.length;

        for (let i = 0; i < length; ++i) {
            nodes[i].addEventListener('click', function (evt)
            {
                let fragmentString = window.location.href.includes('#') ? Http.parseUrl(window.location.href).fragment : '';

                /* Change Tab */
                /* Remove selected tab */
                const oldActive = this.parentNode.getElementsByClassName('active');
                if (oldActive.length > 0) {
                    // find old active and remove it
                    fragmentString = jsOMS.trim(
                        fragmentString.replace(oldActive[0].getElementsByTagName('label')[0].getAttribute('for'), ''),
                        ','
                    );

                    jsOMS.removeClass(oldActive[0], 'active');
                }

                // remove new element if new element already inside, alternatively check for existence and don't do a new push state?
                // todo: here is a bug or in the uri factory. replace also replaces substrings e.g. #test-c-tab-1 gets partially replaced
                // by c-tab-1. either search for #c-tab-1 or ,c-tab-1 to be certain. That's not possible because it doesn't start with `#`
                fragmentString = jsOMS.trim(
                    fragmentString.replace(this.getElementsByTagName('label')[0].getAttribute('for'), ''),
                    ','
                );

                jsOMS.addClass(this, 'active');

                /* Add selected tab */
                window.history.pushState(null, '',
                    UriFactory.build(
                        '{%}#' + (fragmentString === '' ? '' : fragmentString + ',') + this.getElementsByTagName('label')[0].getAttribute('for')
                    )
                );
            });
        }

        this.activateTabUri(e);
    };

    /**
     * Activates the correct tab based on URI fragment.
     *
     * This allows to link a specific open tab to a user or make it a bookmark
     *
     * @param {Object} e Element
     *
     * @return {void}
     *
     * @since  1.0.0
     */
    activateTabUri(e)
    {
        const fragmentString = window.location.href.includes('#') ? Http.parseUrl(window.location.href).fragment : '';
        const fragments      = fragmentString.split(','),
            fragLength = fragments.length;

        if (fragLength > 0 && fragmentString !== '') {
            for (let i = 0; i < fragLength; ++i) {
                let label = e.querySelectorAll('label[for="' + fragments[i] + '"]')[0];
                if (typeof label !== 'undefined') {
                    label.click();
                }
            }
        }

        if (e.getElementsByClassName('active').length < 1) {
            e.querySelector('label').click();
        }
    };
};