/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Bespin.
 *
 * The Initial Developer of the Original Code is
 * Mozilla.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Bespin Team (bespin@mozilla.com)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

var SC = require('sproutcore/runtime').SC;

/**
 * @class
 *
 * A list of recently opened files.
 */
exports.History = SC.Object.extend({
    storage: window.localStorage,

    addPath: function(path) {
        var storage = this.get('storage');
        var historyStr = storage.history;
        var history = SC.none(historyStr) ? [] : JSON.parse(historyStr);

        history.push(path);
        storage.history = JSON.stringify(history);
    },

    getRecent: function(max) {
        var historyStr = this.get('storage').history;
        var history = SC.none(historyStr) ? [] : JSON.parse(historyStr);

        var historyLength = history.length;
        var seen = {}, result = [], count = 0;

        for (var i = historyLength - 1; i >= 0; i--) {
            var path = history[i];
            if (!(path in seen)) {
                seen[path] = true;
                result.push(path);

                count++;
                if (count === max) {
                    break;
                }
            }
        }

        return result;
    }
});

