// ==UserScript==
// @name         Overleaf fileswitcher
// @namespace    http://tampermonkey.net/
// @version      1.0
// @license      apache2
// @description  Custom hotkeys for switching between files on overleaf.com
// @author       Aditya Sriram
// @match        https://www.overleaf.com/project/*
// @grant        none
// @require      http://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js
// @require      http://cdnjs.cloudflare.com/ajax/libs/mousetrap/1.6.1/mousetrap.min.js
// @require      http://cdnjs.cloudflare.com/ajax/libs/mousetrap/1.6.1/plugins/global-bind/mousetrap-global-bind.min.js
// @downloadURL none
// ==/UserScript==

(function() {
    var $ = jQuery.noConflict();
    var allow_ext = ['tex', 'bib'];

    var shortcuts = {};

    function keybindg(key, desc, func) {
        shortcuts[key] = desc;
        Mousetrap.bindGlobal(key, function() {
            console.log("triggered " + key);
            func();
        });
    }

    function init() {
        console.log("activating custom overleaf hotkeys...");
    }

    function getfilename(i,e) {
        if (typeof(e) === "undefined") e = i;
        return $(e).find('span.ng-binding').eq(0).text().trim();
    }

    function match_ext(i, f) {
        var fname = getfilename(f);
        for (var ext of allow_ext) {
            if (fname.endsWith(ext))
                return true;
        }
        return false;
    }

    function switchFile(n) {
        var files = $('file-entity:not(:has(div[ng-controller]))');
        files = files.filter(match_ext);

        var idx = files.index(files.filter(':has(.selected)'));
        if (idx < 0) {
            idx = 0;
            console.log('no filtered file selected, falling back to first file');
        }

        var newidx = idx+n;
        if (newidx >= files.length) newidx = 0;
        if (newidx < 0) newidx = files.length-1;

        var newfile = files.eq(newidx);
        newfile.find('li').click(); // click li to focus file

        var filename = getfilename(newfile); // get file name
        var parents = newfile.parents('file-entity');
        var filepath = parents.map(getfilename).get().reverse();
        //filename = filename.replace(/RenameDelete/g, "");

        if ($('#monkey-filename').length == 0) { // add file name display if it doesn't already exist
            $('span.name.ng-binding').parent().after('<span id="monkey-filename" style="color:white;"></span>');
        }
        $('#monkey-filename').text("/" + filepath.concat(filename).join("/"));
    }

    $(document).ready(function() {
        init();
        keybindg('ctrl+shift+pageup', 'Previous File', function() {switchFile(-1);});
        keybindg('ctrl+shift+pagedown', 'Next File', function() {switchFile(+1);});
        console.log('hotkeys:', JSON.parse(JSON.stringify(shortcuts)));
    });

})();