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/*!
 * Deluge.Client.js
 * 
 * Copyright (c) Damien Churchill 2009-2010 <damoxc@gmail.com>
 *
 * 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, 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, write to:
 *     The Free Software Foundation, Inc.,
 *     51 Franklin Street, Fifth Floor
 *     Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the OpenSSL
 * library.
 * You must obey the GNU General Public License in all respects for all of
 * the code used other than OpenSSL. If you modify file(s) with this
 * exception, you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete
 * this exception statement from your version. If you delete this exception
 * statement from all source files in the program, then also delete it here.
 */
Ext.namespace('Ext.ux.util');

/**
 * A class that connects to a json-rpc resource and adds the available
 * methods as functions to the class instance.
 * @class Ext.ux.util.RpcClient
 * @namespace Ext.ux.util
 */
Ext.ux.util.RpcClient = Ext.extend(Ext.util.Observable, {

    _components: [],
    
    _methods: [],
    
    _requests: {},
    
    _url: null,
    
    _optionKeys: ['scope', 'success', 'failure'],
    
    constructor: function(config) {
        Ext.ux.util.RpcClient.superclass.constructor.call(this, config);
        this._url = config.url || null;
        this._id = 0;
        
        this.addEvents(
            // raw events
            /**
             * @event connected
             * Fires when the client has retrieved the list of methods from the server.
             * @param {Ext.ux.util.RpcClient} this
             */
             'connected',
             
             'error'
        );
        this.reloadMethods();
    },
    
    reloadMethods: function() {
        Ext.each(this._components, function(component) {
            delete this[component];
        }, this);
        this._execute('system.listMethods', {
            success: this._setMethods,
            scope: this
        });
    },

    _execute: function(method, options) {
        options = options || {};
        options.params = options.params || [];
        options.id = this._id;
        
        var request = Ext.encode({
            method: method,
            params: options.params,
            id: options.id
        });
        this._id++;
        
        return Ext.Ajax.request({
            url: this._url,
            method: 'POST',
            success: this._onSuccess,
            failure: this._onFailure,
            scope: this,
            jsonData: request,
            options: options
        });
    },
    
    _onFailure: function(response, requestOptions) {
        var options = requestOptions.options;
        errorObj = {
            id: options.id,
            result: null,
            error: {
                msg: 'HTTP: ' + response.status + ' ' + response.statusText,
                code: 255
            }
        }
        
        this.fireEvent('error', errorObj, response, requestOptions)
        
        if (Ext.type(options.failure) != 'function') return;
        if (options.scope) {
            options.failure.call(options.scope, errorObj, response, requestOptions);
        } else {
            options.failure(errorObj, response, requestOptions);
        }            
    },
    
    _onSuccess: function(response, requestOptions) {
        var responseObj = Ext.decode(response.responseText);
        var options = requestOptions.options;
        if (responseObj.error) {
            this.fireEvent('error', responseObj, response, requestOptions);
            
            if (Ext.type(options.failure) != 'function') return;
            if (options.scope) {
                options.failure.call(options.scope, responseObj, response, requestOptions);
            } else {
                options.failure(responseObj, response, requestOptions);
            }
        } else {
            if (Ext.type(options.success) != 'function') return;
            if (options.scope) {
                options.success.call(options.scope, responseObj.result, responseObj, response, requestOptions);
            } else {
                options.success(responseObj.result, responseObj, response, requestOptions);
            }
        }
    },
    
    _parseArgs: function(args) {
        var params = [];
        Ext.each(args, function(arg) {
            params.push(arg);
        });
        
        var options = params[params.length - 1];
        if (Ext.type(options) == 'object') {
            var keys = Ext.keys(options), isOption = false;
            
            Ext.each(this._optionKeys, function(key) {
                if (keys.indexOf(key) > -1) isOption = true;
            });
            
            if (isOption) {
                params.remove(options)
            } else {
                options = {}
            }
        } else {
            options = {}
        }
        options.params = params;
        return options;
    },

    _setMethods: function(methods) {
        var components = {}, self = this;
        
        Ext.each(methods, function(method) {
            var parts = method.split('.');
            var component = components[parts[0]] || {};
            
            var fn = function() {
                var options = self._parseArgs(arguments);
                return self._execute(method, options);
            }
            component[parts[1]] = fn;
            components[parts[0]] = component;
        });
        
        for (var name in components) {
            self[name] = components[name];
        }
        
        this._components = Ext.keys(components);
        this.fireEvent('connected', this);
    }
});