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

    uBlock Origin - a browser extension to block requests.
    Copyright (C) 2023-present Raymond Hill

    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://github.com/gorhill/uBlock
*/

/* globals CodeMirror, uBlockDashboard, beautifier */

'use strict';

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

import { dom, qs$ } from './dom.js';

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

(async ( ) => {
    const params = new URLSearchParams(document.location.search);
    const url = params.get('url');

    const a = qs$('.cm-search-widget .sourceURL');
    dom.attr(a, 'href', url);
    dom.attr(a, 'title', url);

    const response = await fetch(url);
    const text = await response.text();

    let mime = response.headers.get('Content-Type') || '';
    mime = mime.replace(/\s*;.*$/, '').trim();
    let value = '';
    switch ( mime ) {
        case 'text/css':
            value = beautifier.css(text, { indent_size: 2 });
            break;
        case 'text/html':
        case 'application/xhtml+xml':
        case 'application/xml':
        case 'image/svg+xml':
            value = beautifier.html(text, { indent_size: 2 });
            break;
        case 'text/javascript':
        case 'application/javascript':
        case 'application/x-javascript':
            value = beautifier.js(text, { indent_size: 4 });
            break;
        case 'application/json':
            value = beautifier.js(text, { indent_size: 2 });
            break;
        default:
            value = text;
            break;
    }

    const cmEditor = new CodeMirror(qs$('#content'), {
        autofocus: true,
        gutters: [ 'CodeMirror-linenumbers' ],
        lineNumbers: true,
        lineWrapping: true,
        matchBrackets: true,
        mode: mime,
        styleActiveLine: {
            nonEmpty: true,
        },
        value,
    });

    uBlockDashboard.patchCodeMirrorEditor(cmEditor);
    if ( dom.cl.has(dom.html, 'dark') ) {
        dom.cl.add('#content .cm-s-default', 'cm-s-night');
        dom.cl.remove('#content .cm-s-default', 'cm-s-default');
    }

    // Convert resource URLs into clickable links to code viewer
    cmEditor.addOverlay({
        re: /\b(?:href|src)=["']([^"']+)["']/g,
        match: null,
        token: function(stream) {
            if ( stream.sol() ) {
                this.re.lastIndex = 0;
                this.match = this.re.exec(stream.string);
            }
            if ( this.match === null ) {
                stream.skipToEnd();
                return null;
            }
            const end = this.re.lastIndex - 1;
            const beg = end - this.match[1].length;
            if ( stream.pos < beg ) {
                stream.pos = beg;
                return null;
            }
            if ( stream.pos < end ) {
                stream.pos = end;
                return 'href';
            }
            if ( stream.pos < this.re.lastIndex ) {
                stream.pos = this.re.lastIndex;
                this.match = this.re.exec(stream.string);
                return null;
            }
            stream.skipToEnd();
            return null;
        },
    });

    dom.on('#content', 'click', '.cm-href', ev => {
        const href = ev.target.textContent;
        try {
            const toURL = new URL(href, url);
            vAPI.messaging.send('codeViewer', {
                what: 'gotoURL',
                details: {
                    url: `code-viewer.html?url=${encodeURIComponent(toURL.href)}`,
                    select: true,
                },
            });
        } catch(ex) {
        }
    });
})();