/*******************************************************************************

    ηMatrix - a browser extension to black/white list requests.
    Copyright (C) 2015-2019 Raymond Hill
    Copyright (C) 2019-2022 Alessio Vanni

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see {http://www.gnu.org/licenses/}.

    Home: https://gitlab.com/vannilla/ematrix
    uMatrix Home: https://github.com/gorhill/uBlock
*/

/* global uDom */

'use strict';

(function () {
    let details = {};

    (function () {
	let matches = /details=([^&]+)/.exec(window.location.search);
	if (matches === null) {
	    return;
	}
	try {
            details = JSON.parse(atob(matches[1]));
	} catch(ex) {
	}
    })();

    uDom('.what').text(details.url);
    // uDom('#why').text(details.why.slice(3));

    // https://github.com/gorhill/uMatrix/issues/502
    //   Code below originally imported from:
    //   https://github.com/gorhill/uBlock/blob/master/src/js/document-blocked.js
    (function () {
	if (typeof URL !== 'function') {
	    return;
	}

	const reURL = /^https?:\/\//;

	const liFromParam = function (name, value) {
            if (value === '') {
		value = name;
		name = '';
            }

            let li = document.createElement('li');
            let span = document.createElement('span');
            span.textContent = name;
            li.appendChild(span);
            if (name !== '' && value !== '') {
		li.appendChild(document.createTextNode(' = '));
            }
            span = document.createElement('span');
            if (reURL.test(value)) {
		let a = document.createElement('a');
		a.href = a.textContent = value;
		span.appendChild(a);
            } else {
		span.textContent = value;
            }
            li.appendChild(span);
            return li;
	};

	const safeDecodeURIComponent = function (s) {
            try {
		s = decodeURIComponent(s);
            } catch (ex) {
            }
            return s;
	};

	const renderParams = function (parentNode, rawURL, step) {
	    if (0 === step) {
		// The URL is too nested, bail out (successfully) to
		// avoid denial of service attacks.
		return true;
	    }

            let a = document.createElement('a');
            a.href = rawURL;
            if (a.search.length === 0) {
		return false;
	    }

            let pos = rawURL.indexOf('?');
            let li = liFromParam(vAPI.i18n('docblockedNoParamsPrompt'),
				 rawURL.slice(0, pos));
            parentNode.appendChild(li);

            let params = a.search.slice(1).split('&');
            for (let i=0; i<params.length; ++i) {
		let param = params[i];
		pos = param.indexOf('=');
		if (pos === -1) {
                    pos = param.length;
		}
		let name = safeDecodeURIComponent(param.slice(0, pos));
		let value = safeDecodeURIComponent(param.slice(pos + 1));
		li = liFromParam(name, value);

		if (reURL.test(value)) {
                    let ul = document.createElement('ul');
                    renderParams(ul, value, step - 1);
                    li.appendChild(ul);
		}
		parentNode.appendChild(li);
            }

            return true;
	};

	// The number of steps is arbitrary, but there's no point in
	// making it to large.
	if (renderParams(uDom.nodeFromId('parsed'), details.url, 3) === false) {
            return;
	}

	let toggler = document.createElement('span');
	toggler.className = 'fa';
	uDom('#theURL > p').append(toggler);

	uDom(toggler).on('click', function () {
            let collapsed = uDom
		.nodeFromId('theURL')
		.classList
		.toggle('collapsed');

            vAPI.localStorage.setItem('document-blocked-collapse-url',
				      collapsed.toString());
	});

	let p = vAPI.localStorage.getItem('document-blocked-collapse-url');
	uDom.nodeFromId('theURL').classList.toggle('collapsed', p === 'true');
    })();

    if (window.history.length > 1) {
	uDom('#back').on('click', function () {
	    window.history.back();
	});
	uDom('#bye').css('display', 'none');
    } else {
	uDom('#bye').on('click', function () {
	    window.close();
	});
	uDom('#back').css('display', 'none');
    }

    // See if the target hostname is still blacklisted, and if not,
    // navigate to it.
    vAPI.messaging.send('main-blocked.js', {
	what: 'mustBlock',
	scope: details.hn,
	hostname: details.hn,
	type: 'doc'
    }, function (response) {
	if (response === false) {
            window.location.replace(details.url);
	}
    });
})();