/* ***** 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 Skywriter.
 *
 * 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):
 *   Kevin Dangoor (kdangoor@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
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {

var Promise = require("pilot/promise").Promise;

exports.REASONS = {
    APP_STARTUP: 1,
    APP_SHUTDOWN: 2,
    PLUGIN_ENABLE: 3,
    PLUGIN_DISABLE: 4,
    PLUGIN_INSTALL: 5,
    PLUGIN_UNINSTALL: 6,
    PLUGIN_UPGRADE: 7,
    PLUGIN_DOWNGRADE: 8
};

exports.Plugin = function(name) {
    this.name = name;
    this.status = this.INSTALLED;
};

exports.Plugin.prototype = {
    /**
     * constants for the state
     */
    NEW: 0,
    INSTALLED: 1,
    REGISTERED: 2,
    STARTED: 3,
    UNREGISTERED: 4,
    SHUTDOWN: 5,

    install: function(data, reason) {
        var pr = new Promise();
        if (this.status > this.NEW) {
            pr.resolve(this);
            return pr;
        }
        require([this.name], function(pluginModule) {
            if (pluginModule.install) {
                pluginModule.install(data, reason);
            }
            this.status = this.INSTALLED;
            pr.resolve(this);
        }.bind(this));
        return pr;
    },

    register: function(data, reason) {
        var pr = new Promise();
        if (this.status != this.INSTALLED) {
            pr.resolve(this);
            return pr;
        }
        require([this.name], function(pluginModule) {
            if (pluginModule.register) {
                pluginModule.register(data, reason);
            }
            this.status = this.REGISTERED;
            pr.resolve(this);
        }.bind(this));
        return pr;
    },

    startup: function(data, reason) {
        reason = reason || exports.REASONS.APP_STARTUP;
        var pr = new Promise();
        if (this.status != this.REGISTERED) {
            pr.resolve(this);
            return pr;
        }
        require([this.name], function(pluginModule) {
            if (pluginModule.startup) {
                pluginModule.startup(data, reason);
            }
            this.status = this.STARTED;
            pr.resolve(this);
        }.bind(this));
        return pr;
    },

    shutdown: function(data, reason) {
        if (this.status != this.STARTED) {
            return;
        }
        pluginModule = require(this.name);
        if (pluginModule.shutdown) {
            pluginModule.shutdown(data, reason);
        }
    }
};

exports.PluginCatalog = function() {
    this.plugins = {};
};

exports.PluginCatalog.prototype = {
    registerPlugins: function(pluginList, data, reason) {
        var registrationPromises = [];
        pluginList.forEach(function(pluginName) {
            var plugin = this.plugins[pluginName];
            if (plugin === undefined) {
                plugin = new exports.Plugin(pluginName);
                this.plugins[pluginName] = plugin;
                registrationPromises.push(plugin.register(data, reason));
            }
        }.bind(this));
        return Promise.group(registrationPromises);
    },

    startupPlugins: function(data, reason) {
        var startupPromises = [];
        for (var pluginName in this.plugins) {
            var plugin = this.plugins[pluginName];
            startupPromises.push(plugin.startup(data, reason));
        }
        return Promise.group(startupPromises);
    }
};

exports.catalog = new exports.PluginCatalog();

});