/*
 * Ext JS Library 1.0.1
 * Copyright(c) 2006-2007, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://www.extjs.com/license
 */

/**
 * @class Ext.data.Store
 * @extends Ext.util.Observable
 * The Store class encapsulates a client side cache of {@link Ext.data.Record} objects which provide input data
 * for widgets such as the Ext.grid.Grid, or the Ext.form.ComboBox.
 * A Store object uses an implementation of {@link Ext.data.DataProxy} to access a data object unless you call loadData() directly and pass in your data. The Store object
 * has no knowledge of the format of the data returned by the Proxy.
 * The Store object uses its configured implementation of Ext.data.DataReader to create Ext.data.Record
 * instances from the data object. These records are cached and made available through accessor functions.
 * @constructor
 * Creates a new Store
 * @param {Object} config A config object containing the objects needed for the Store to access data,
 * and read the data into Records.
 */
Ext.data.Store = function(config){
    this.data = new Ext.util.MixedCollection(false);
    this.data.getKey = function(o){
        return o.id;
    };
    this.baseParams = {};
    this.paramNames = {
        "start" : "start",
        "limit" : "limit",
        "sort" : "sort",
        "dir" : "dir"
    };
    Ext.apply(this, config);

    if(this.reader && !this.recordType){ // reader passed
        this.recordType = this.reader.recordType;
    }

    this.fields = this.recordType.prototype.fields;

    this.modified = [];

    this.addEvents({
        /**
         * @event datachanged
         * Fires when the data cache has changed, and a widget which is using this Store
         * as a Record cache should refresh its view.
         * @param {Store} this
         */
        datachanged : true,
        /**
         * @event add
         * Fires when Records have been added to the Store
         * @param {Store} this
         * @param {Ext.data.Record[]} records The array of Records added
         * @param {Number} index The index at which the record(s) were added
         */
        add : true,
        /**
         * @event remove
         * Fires when Records have been removed from the Store
         * @param {Store} this
         * @param {Ext.data.Record} record The Record that was removed
         * @param {Number} index The index at which the record was removed
         */
        remove : true,
        /**
         * @event update
         * Fires when Records have been updated
         * @param {Store} this
         * @param {Ext.data.Record} record The Record that was updated
         * @param {String} operation The update operation being performed.  Value may be one of:
         * <pre><code>
 Ext.data.Record.EDIT
 Ext.data.Record.REJECT
 Ext.data.Record.COMMIT
         * </code></pre>
         */
        update : true,
        /**
         * @event clear
         * Fires when the data cache has been cleared.
         * @param {Store} this
         */
        clear : true,
        /**
         * @event beforeload
         * Fires before a request is made for a new data object.  If the beforeload handler returns false
         * the load action will be canceled.
         * @param {Store} this
         * @param {Object} options The loading options that were specified (see {@link #load} for details)
         */
        beforeload : true,
        /**
         * @event load
         * Fires after a new set of Records has been loaded.
         * @param {Store} this
         * @param {Ext.data.Record[]} records The Records that were loaded
         * @param {Object} options The loading options that were specified (see {@link #load} for details)
         */
        load : true,
        /**
         * @event loadexception
         * Fires if an exception occurs in the Proxy during loading.
         * Called with the signature of the Proxy's "loadexception" event.
         */
        loadexception : true
    });

    if(this.proxy){
        this.relayEvents(this.proxy,  ["loadexception"]);
    }
    this.sortToggle = {};
    
    Ext.data.Store.superclass.constructor.call(this);
};
Ext.extend(Ext.data.Store, Ext.util.Observable, {
    /**
    * @cfg {Ext.data.DataProxy} proxy The Proxy object which provides access to a data object.
    */
    /**
    * @cfg {Ext.data.Reader} reader The Reader object which processes the data object and returns
    * an Array of Ext.data.record objects which are cached keyed by their <em>id</em> property.
    */
    /**
    * @cfg {Object} baseParams An object containing properties which are to be sent as parameters
    * on any HTTP request
    */
    /**
    * @cfg {Object} sortInfo A config object in the format: {field: "fieldName", direction: "ASC|DESC"}
    */
    /**
    * @cfg {boolean} remoteSort True if sorting is to be handled by requesting the Proxy to provide a refreshed
    * version of the data object in sorted order, as opposed to sorting the Record cache in place (defaults to false).
    */
    remoteSort : false,

    // private
    lastOptions : null,

    /**
     * Add Records to the Store and fires the add event.
     * @param {Ext.data.Record[]} records An Array of Ext.data.Record objects to add to the cache.
     */
    add : function(records){
        records = [].concat(records);
        for(var i = 0, len = records.length; i < len; i++){
            records[i].join(this);
        }
        var index = this.data.length;
        this.data.addAll(records);
        this.fireEvent("add", this, records, index);
    },

    /**
     * Remove a Record from the Store and fires the remove event.
     * @param {Ext.data.Record} record Th Ext.data.Record object to remove from the cache.
     */
    remove : function(record){
        var index = this.data.indexOf(record);
        this.data.removeAt(index);
        this.fireEvent("remove", this, record, index);
    },

    /**
     * Remove all Records from the Store and fires the clear event.
     */
    removeAll : function(){
        this.data.clear();
        this.fireEvent("clear", this);
    },

    /**
     * Inserts Records to the Store at the given index and fires the add event.
     * @param {Number} index The start index at which to insert the passed Records.
     * @param {Ext.data.Record[]} records An Array of Ext.data.Record objects to add to the cache.
     */
    insert : function(index, records){
        records = [].concat(records);
        for(var i = 0, len = records.length; i < len; i++){
            this.data.insert(index, records[i]);
            records[i].join(this);
        }
        this.fireEvent("add", this, records, index);
    },

    /**
     * Get the index within the cache of the passed Record.
     * @param {Ext.data.Record[]} records An Array of Ext.data.Record objects to add to the cache.
     * @return {Number} The index of the passed Record. Returns -1 if not found.
     */
    indexOf : function(record){
        return this.data.indexOf(record);
    },

    /**
     * Get the index within the cache of the Record with the passed id.
     * @param {String} id The id of the Record to find.
     * @return {Number} The index of the Record. Returns -1 if not found.
     */
    indexOfId : function(id){
        return this.data.indexOfKey(id);
    },

    /**
     * Get the Record with the specified id.
     * @param {String} id The id of the Record to find.
     * @return {Ext.data.Record} The Record with the passed id. Returns undefined if not found.
     */
    getById : function(id){
        return this.data.key(id);
    },

    /**
     * Get the Record at the specified index.
     * @param {String} index The index of the Record to find.
     * @return {Ext.data.Record} The Record at the passed index. Returns undefined if not found.
     */
    getAt : function(index){
        return this.data.itemAt(index);
    },

    /**
     * Returns a range of Records between specified indices.
     * @param {Number} startIndex (optional) The starting index (defaults to 0)
     * @param {Number} endIndex (optional) The ending index (defaults to the last Record in the Store)
     * @return {Ext.data.Record[]} An array of Records
     */
    getRange : function(start, end){
        return this.data.getRange(start, end);
    },

    // private
    storeOptions : function(o){
        o = Ext.apply({}, o);
        delete o.callback;
        delete o.scope;
        this.lastOptions = o;
    },

    /**
     * Loads the Record cache from the configured Proxy using the configured Reader.
     * <p>
     * If using remote paging, then the first load call must specify the <em>start</em>
     * and <em>limit</em> properties in the options.params property to establish the initial
     * position within the dataset, and the number of Records to cache on each read from the Proxy.
     * <p>
     * <strong>It is important to note that for remote data sources, loading is asynchronous,
     * and this call will return before the new data has been loaded. Perform any post-processing
     * in a callback function, or in a "load" event handler.</strong>
     * <p>
     * @param {Object} options An object containing properties which control loading options:
     * <pre><code>
 params {Object} An object containing properties to pass as HTTP parameters to a remote data source.
 callback {Function} A function to be called after the Records have been loaded. The callback is
 passed the following arguments:
   r : Ext.data.Record[]
   options: Options object from the load call
   success: Boolean success indicator
 scope {Object} Scope with which to call the callback (defaults to the Store object)
 append {Boolean} indicator to append loaded records rather than replace the current cache.
 * </code></pre>
     */
    load : function(options){
        options = options || {};
        if(this.fireEvent("beforeload", this, options) !== false){
            this.storeOptions(options);
            var p = Ext.apply(options.params || {}, this.baseParams);
            if(this.sortInfo && this.remoteSort){
                var pn = this.paramNames;
                p[pn["sort"]] = this.sortInfo.field;
                p[pn["dir"]] = this.sortInfo.direction;
            }
            this.proxy.load(p, this.reader, this.loadRecords, this, options);
        }
    },

    /**
     * Reloads the Record cache from the configured Proxy using the configured Reader and
     * the options from the last load operation performed.
     * @param {Object} options (optional) An object containing properties which may override the options
     * used in the last load operation. See {@link #load} for details (defaults to null, in which case
     * the most recently used options are reused).
     */
    reload : function(options){
        this.load(Ext.applyIf(options||{}, this.lastOptions));
    },

    // private
    // Called as a callback by the Reader during a load operation.
    loadRecords : function(o, options, success){
        if(!o || success === false){
            if(success !== false){
                this.fireEvent("load", this, [], options);
            }
            if(options.callback){
                options.callback.call(options.scope || this, [], options, false);
            }
            return;
        }
        var r = o.records, t = o.totalRecords || r.length;
        for(var i = 0, len = r.length; i < len; i++){
            r[i].join(this);
        }
        if(!options || options.add !== true){
            this.data.clear();
            this.data.addAll(r);
            this.totalLength = t;
            this.applySort();
            this.fireEvent("datachanged", this);
        }else{
            this.totalLength = Math.max(t, this.data.length+r.length);
            this.data.addAll(r);
        }
        this.fireEvent("load", this, r, options);
        if(options.callback){
            options.callback.call(options.scope || this, r, options, true);
        }
    },

    /**
     * Loads data from a passed data block. A Reader which understands the format of the data
     * must have been configured in the constructor.
     * @param {Object} data The data block from which to read the Records.  The format of the data expected
     * is dependent on the type of Reader that is configured and should correspond to that Reader's readRecords parameter.
     * @param {Boolean} append (Optional) True to append the new Records rather than replace the existing cache.
     */
    loadData : function(o, append){
        var r = this.reader.readRecords(o);
        this.loadRecords(r, {add: append}, true);
    },

    /**
     * Gets the number of cached records.
     * <p>
     * <em>If using paging, this may not be the total size of the dataset. If the data object
     * used by the Reader contains the dataset size, then the getTotalCount() function returns
     * the data set size</em>
     */
    getCount : function(){
        return this.data.length || 0;
    },

    /**
     * Gets the total number of records in the dataset.
     * <p>
     * <em>If using paging, for this to be accurate, the data object used by the Reader must contain
     * the dataset size</em>
     */
    getTotalCount : function(){
        return this.totalLength || 0;
    },

    /**
     * Returns the sort state of the Store as an object with two properties:
     * <pre><code>
 field {String} The name of the field by which the Records are sorted
 direction {String} The sort order, "ASC" or "DESC"
     * </code></pre>
     */
    getSortState : function(){
        return this.sortInfo;
    },

    // private
    applySort : function(){
        if(this.sortInfo && !this.remoteSort){
            var s = this.sortInfo, f = s.field;
            var st = this.fields.get(f).sortType;
            var fn = function(r1, r2){
                var v1 = st(r1.data[f]), v2 = st(r2.data[f]);
                return v1 > v2 ? 1 : (v1 < v2 ? -1 : 0);
            };
            this.data.sort(s.direction, fn);
            if(this.snapshot && this.snapshot != this.data){
                this.snapshot.sort(s.direction, fn);
            }
        }
    },

    /**
     * Sets the default sort column and order to be used by the next load operation.
     * @param {String} fieldName The name of the field to sort by.
     * @param {String} dir (optional) The sort order, "ASC" or "DESC" (defaults to "ASC")
     */
    setDefaultSort : function(field, dir){
        this.sortInfo = {field: field, direction: dir ? dir.toUpperCase() : "ASC"};
    },

    /**
     * Sort the Records.
     * If remote sorting is used, the sort is performed on the server, and the cache is
     * reloaded. If local sorting is used, the cache is sorted internally.
     * @param {String} fieldName The name of the field to sort by.
     * @param {String} dir (optional) The sort order, "ASC" or "DESC" (defaults to "ASC")
     */
    sort : function(fieldName, dir){
        var f = this.fields.get(fieldName);
        if(!dir){
            if(this.sortInfo && this.sortInfo.field == f.name){ // toggle sort dir
                dir = (this.sortToggle[f.name] || "ASC").toggle("ASC", "DESC");
            }else{
                dir = f.sortDir;
            }
        }
        this.sortToggle[f.name] = dir;
        this.sortInfo = {field: f.name, direction: dir};
        if(!this.remoteSort){
            this.applySort();
            this.fireEvent("datachanged", this);
        }else{
            this.load(this.lastOptions);
        }
    },

    /**
     * Calls the specified function for each of the Records in the cache.
     * @param {Function} fn The function to call. The Record is passed as the first parameter.
     * Returning <em>false</em> aborts and exits the iteration.
     * @param {Object} scope (optional) The scope in which to call the function (defaults to the Record).
     */
    each : function(fn, scope){
        this.data.each(fn, scope);
    },

    /**
     * Get all records modified since the last load, or since the last commit.
     * @return {Ext.data.Record[]} An array of Records containing outstanding modifications.
     */
    getModifiedRecords : function(){
        return this.modified;
    },

    /**
     * Filter the records by a specified property.
     * @param {String} field A field on your records
     * @param {String/RegExp} value Either a string that the field
     * should start with or a RegExp to test against the field
     * @return {Boolean} True if the filter matched at least one record, else false
     */
    filter : function(property, value){
        if(!value.exec){ // not a regex
            value = String(value);
            if(value.length == 0){
                return this.clearFilter();
            }
            value = new RegExp("^" + Ext.escapeRe(value), "i");
        }
        this.filterBy(function(r){
            return value.test(r.data[property]);
        });
    },

    /**
     * Filter by a function. The specified function will be called with each
     * record in this data source. If the function returns true the record is included,
     * otherwise it is filtered.
     * @param {Function} fn The function to be called, it will receive 2 args (record, id)
     * @param {Object} scope (optional) The scope of the function (defaults to this)
     */
    filterBy : function(fn, scope){
        var data = this.snapshot || this.data;
        this.snapshot = data;
        this.data = data.filterBy(fn, scope);
        this.fireEvent("datachanged", this);
    },

    /**
     * Revert to a view of the Record cache with no filtering applied.
     * @param {Boolean} suppressEvent If true the filter is cleared silently without notifying listeners
     */
    clearFilter : function(suppressEvent){
        if(this.snapshot && this.snapshot != this.data){
            this.data = this.snapshot;
            delete this.snapshot;
            if(suppressEvent !== true){
                this.fireEvent("datachanged", this);
            }
        }
    },

    // private
    afterEdit : function(record){
        if(this.modified.indexOf(record) == -1){
            this.modified.push(record);
        }
        this.fireEvent("update", this, record, Ext.data.Record.EDIT);
    },

    // private
    afterReject : function(record){
        this.modified.remove(record);
        this.fireEvent("update", this, record, Ext.data.Record.REJECT);
    },

    // private
    afterCommit : function(record){
        this.modified.remove(record);
        this.fireEvent("update", this, record, Ext.data.Record.COMMIT);
    },

    /**
     * Commit all Records with outstanding changes. To handle updates for changes, subscribe to the
     * Store's "update" event, and perform updating when the third parameter is Ext.data.Record.COMMIT.
     */
    commitChanges : function(){
        var m = this.modified.slice(0);
        this.modified = [];
        for(var i = 0, len = m.length; i < len; i++){
            m[i].commit();
        }
    },

    /**
     * Cancel outstanding changes on all changed records.
     */
    rejectChanges : function(){
        var m = this.modified.slice(0);
        this.modified = [];
        for(var i = 0, len = m.length; i < len; i++){
            m[i].reject();
        }
    }
});