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 * Distributed under the BSD license:
 *
 * Copyright (c) 2010, Ajax.org B.V.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Ajax.org B.V. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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define(function(require, exports, module) {
"use strict";

var EditSession = require("../edit_session").EditSession;
var TextLayer = require("../layer/text").Text;
var baseStyles = require("../requirejs/text!./static.css");
var config = require("../config");
var dom = require("../lib/dom");


var highlight = function(el, opts, callback) {
    var m = el.className.match(/lang-(\w+)/);
    var mode = opts.mode || m && ("ace/mode/" + m[1]);
    if (!mode)
        return false;
    var theme = opts.theme || "ace/theme/textmate";
    
    var data = "";
    var nodes = [];

    if (el.firstElementChild) {
        var textLen = 0;
        for (var i = 0; i < el.childNodes.length; i++) {
            var ch = el.childNodes[i];
            if (ch.nodeType == 3) {
                textLen += ch.data.length;
                data += ch.data;
            } else {
                nodes.push(textLen, ch);
            }
        }
    } else {
        data = dom.getInnerText(el);
        if (opts.trim)
            data = data.trim();
    }
    
    highlight.render(data, mode, theme, opts.firstLineNumber, !opts.showGutter, function (highlighted) {
        dom.importCssString(highlighted.css, "ace_highlight");
        el.innerHTML = highlighted.html;
        var container = el.firstChild.firstChild;
        for (var i = 0; i < nodes.length; i += 2) {
            var pos = highlighted.session.doc.indexToPosition(nodes[i]);
            var node = nodes[i + 1];
            var lineEl = container.children[pos.row];
            lineEl && lineEl.appendChild(node);
        }
        callback && callback();
    });
};

/**
 * Transforms a given input code snippet into HTML using the given mode
 *
 * @param {string} input Code snippet
 * @param {string|mode} mode String specifying the mode to load such as
 *  `ace/mode/javascript` or, a mode loaded from `/ace/mode`
 *  (use 'ServerSideHiglighter.getMode').
 * @param {string|theme} theme String specifying the theme to load such as
 *  `ace/theme/twilight` or, a theme loaded from `/ace/theme`.
 * @param {number} lineStart A number indicating the first line number. Defaults
 *  to 1.
 * @param {boolean} disableGutter Specifies whether or not to disable the gutter.
 *  `true` disables the gutter, `false` enables the gutter. Defaults to `false`.
 * @param {function} callback When specifying the mode or theme as a string,
 *  this method has no return value and you must specify a callback function. The
 *  callback will receive the rendered object containing the properties `html`
 *  and `css`.
 * @returns {object} An object containing the properties `html` and `css`.
 */

highlight.render = function(input, mode, theme, lineStart, disableGutter, callback) {
    var waiting = 0;
    var modeCache = EditSession.prototype.$modes;

    // if either the theme or the mode were specified as objects
    // then we need to lazily load them.
    if (typeof theme == "string") {
        waiting++;
        config.loadModule(['theme', theme], function(m) {
            theme = m;
            --waiting || done();
        });
    }

    if (typeof mode == "string") {
        waiting++;
        config.loadModule(['mode', mode], function(m) {
            if (!modeCache[mode]) modeCache[mode] = new m.Mode();
            mode = modeCache[mode];
            --waiting || done();
        });
    }

    // loads or passes the specified mode module then calls renderer
    function done() {
        var result = highlight.renderSync(input, mode, theme, lineStart, disableGutter);
        return callback ? callback(result) : result;
    }
    return waiting || done();
};

/* 
 * Transforms a given input code snippet into HTML using the given mode
 * @param {string} input Code snippet
 * @param {mode} mode Mode loaded from /ace/mode (use 'ServerSideHiglighter.getMode')
 * @param {string} r Code snippet
 * @returns {object} An object containing: html, css
 */

highlight.renderSync = function(input, mode, theme, lineStart, disableGutter) {
    lineStart = parseInt(lineStart || 1, 10);

    var session = new EditSession("");
    session.setUseWorker(false);
    session.setMode(mode);

    var textLayer = new TextLayer(document.createElement("div"));
    textLayer.setSession(session);
    textLayer.config = {
        characterWidth: 10,
        lineHeight: 20
    };

    session.setValue(input);

    var stringBuilder = [];
    var length =  session.getLength();

    for(var ix = 0; ix < length; ix++) {
        stringBuilder.push("<div class='ace_line'>");
        if (!disableGutter)
            stringBuilder.push("<span class='ace_gutter ace_gutter-cell' unselectable='on'>" + /*(ix + lineStart) + */ "</span>");
        textLayer.$renderLine(stringBuilder, ix, true, false);
        stringBuilder.push("\n</div>");
    }

    // let's prepare the whole html
    var html = "<div class='" + theme.cssClass + "'>" +
        "<div class='ace_static_highlight' style='counter-reset:ace_line " + (lineStart - 1) + "'>" +
            stringBuilder.join("") +
        "</div>" +
    "</div>";

    textLayer.destroy();

    return {
        css: baseStyles + theme.cssText,
        html: html,
        session: session
    };
};

module.exports = highlight;
module.exports.highlight =highlight;
});