/**
 * @class Ext.ux.form.MultiSelect
 * @extends Ext.form.field.Base
 * A control that allows selection and form submission of multiple list items.
 *
 *  @history
 *    2008-06-19 bpm Original code contributed by Toby Stuart (with contributions from Robert Williams)
 *    2008-06-19 bpm Docs and demo code clean up
 *
 * @constructor
 * Create a new MultiSelect
 * @param {Object} config Configuration options
 * @xtype multiselect
 */
Ext.define('Ext.ux.form.MultiSelect', {
    extend: 'Ext.form.field.Base',
    alternateClassName: 'Ext.ux.Multiselect',
    alias: ['widget.multiselect', 'widget.multiselectfield'],
    uses: [
        'Ext.view.BoundList',
        'Ext.form.FieldSet',
        'Ext.ux.layout.component.form.MultiSelect',
        'Ext.view.DragZone',
        'Ext.view.DropZone'
    ],

    /**
     * @cfg {String} listTitle An optional title to be displayed at the top of the selection list.
     */

    /**
     * @cfg {String/Array} dragGroup The ddgroup name(s) for the MultiSelect DragZone (defaults to undefined).
     */

    /**
     * @cfg {String/Array} dropGroup The ddgroup name(s) for the MultiSelect DropZone (defaults to undefined).
     */

    /**
     * @cfg {Boolean} ddReorder Whether the items in the MultiSelect list are drag/drop reorderable (defaults to false).
     */
    ddReorder: false,

    /**
     * @cfg {Object/Array} tbar An optional toolbar to be inserted at the top of the control's selection list.
     * This can be a {@link Ext.toolbar.Toolbar} object, a toolbar config, or an array of buttons/button configs
     * to be added to the toolbar. See {@link Ext.panel.Panel#tbar}.
     */

    /**
     * @cfg {String} appendOnly True if the list should only allow append drops when drag/drop is enabled
     * (use for lists which are sorted, defaults to false).
     */
    appendOnly: false,

    /**
     * @cfg {String} displayField Name of the desired display field in the dataset (defaults to 'text').
     */
    displayField: 'text',

    /**
     * @cfg {String} valueField Name of the desired value field in the dataset (defaults to the
     * value of {@link #displayField}).
     */

    /**
     * @cfg {Boolean} allowBlank False to require at least one item in the list to be selected, true to allow no
     * selection (defaults to true).
     */
    allowBlank: true,

    /**
     * @cfg {Number} minSelections Minimum number of selections allowed (defaults to 0).
     */
    minSelections: 0,

    /**
     * @cfg {Number} maxSelections Maximum number of selections allowed (defaults to Number.MAX_VALUE).
     */
    maxSelections: Number.MAX_VALUE,

    /**
     * @cfg {String} blankText Default text displayed when the control contains no items (defaults to 'This field is required')
     */
    blankText: 'This field is required',

    /**
     * @cfg {String} minSelectionsText Validation message displayed when {@link #minSelections} is not met (defaults to 'Minimum {0}
     * item(s) required').  The {0} token will be replaced by the value of {@link #minSelections}.
     */
    minSelectionsText: 'Minimum {0} item(s) required',

    /**
     * @cfg {String} maxSelectionsText Validation message displayed when {@link #maxSelections} is not met (defaults to 'Maximum {0}
     * item(s) allowed').  The {0} token will be replaced by the value of {@link #maxSelections}.
     */
    maxSelectionsText: 'Maximum {0} item(s) allowed',

    /**
     * @cfg {String} delimiter The string used to delimit the selected values when {@link #getSubmitValue submitting}
     * the field as part of a form. Defaults to ','. If you wish to have the selected values submitted as separate
     * parameters rather than a single delimited parameter, set this to <tt>null</tt>.
     */
    delimiter: ',',

    /**
     * @cfg {Ext.data.Store/Array} store The data source to which this MultiSelect is bound (defaults to <tt>undefined</tt>).
     * Acceptable values for this property are:
     * <div class="mdetail-params"><ul>
     * <li><b>any {@link Ext.data.Store Store} subclass</b></li>
     * <li><b>an Array</b> : Arrays will be converted to a {@link Ext.data.ArrayStore} internally.
     * <div class="mdetail-params"><ul>
     * <li><b>1-dimensional array</b> : (e.g., <tt>['Foo','Bar']</tt>)<div class="sub-desc">
     * A 1-dimensional array will automatically be expanded (each array item will be the combo
     * {@link #valueField value} and {@link #displayField text})</div></li>
     * <li><b>2-dimensional array</b> : (e.g., <tt>[['f','Foo'],['b','Bar']]</tt>)<div class="sub-desc">
     * For a multi-dimensional array, the value in index 0 of each item will be assumed to be the combo
     * {@link #valueField value}, while the value at index 1 is assumed to be the combo {@link #displayField text}.
     * </div></li></ul></div></li></ul></div>
     */

    componentLayout: 'multiselectfield',

    fieldBodyCls: Ext.baseCSSPrefix + 'form-multiselect-body',


    // private
    initComponent: function(){
        var me = this;

        me.bindStore(me.store, true);
        if (me.store.autoCreated) {
            me.valueField = me.displayField = 'field1';
            if (!me.store.expanded) {
                me.displayField = 'field2';
            }
        }

        if (!Ext.isDefined(me.valueField)) {
            me.valueField = me.displayField;
        }

        me.callParent();
    },

    bindStore: function(store, initial) {
        var me = this,
            oldStore = me.store,
            boundList = me.boundList;

        if (oldStore && !initial && oldStore !== store && oldStore.autoDestroy) {
            oldStore.destroy();
        }

        me.store = store ? Ext.data.StoreManager.lookup(store) : null;
        if (boundList) {
            boundList.bindStore(store || null);
        }
    },


    // private
    onRender: function(ct, position) {
        var me = this,
            panel, boundList, selModel;

        me.callParent(arguments);

        boundList = me.boundList = Ext.create('Ext.view.BoundList', {
            multiSelect: true,
            store: me.store,
            displayField: me.displayField,
            border: false
        });

        selModel = boundList.getSelectionModel();
        me.mon(selModel, {
            selectionChange: me.onSelectionChange,
            scope: me
        });

        panel = me.panel = Ext.create('Ext.panel.Panel', {
            title: me.listTitle,
            tbar: me.tbar,
            items: [boundList],
            renderTo: me.bodyEl,
            layout: 'fit'
        });

        // Must set upward link after first render
        panel.ownerCt = me;

        // Set selection to current value
        me.setRawValue(me.rawValue);
    },

    // No content generated via template, it's all added components
    getSubTplMarkup: function() {
        return '';
    },

    // private
    afterRender: function() {
        var me = this;
        me.callParent();

        if (me.ddReorder && !me.dragGroup && !me.dropGroup){
            me.dragGroup = me.dropGroup = 'MultiselectDD-' + Ext.id();
        }

        if (me.draggable || me.dragGroup){
            me.dragZone = Ext.create('Ext.view.DragZone', {
                view: me.boundList,
                ddGroup: me.dragGroup,
                dragText: '{0} Item{1}'
            });
        }
        if (me.droppable || me.dropGroup){
            me.dropZone = Ext.create('Ext.view.DropZone', {
                view: me.boundList,
                ddGroup: me.dropGroup,
                handleNodeDrop: function(data, dropRecord, position) {
                    var view = this.view,
                        store = view.getStore(),
                        records = data.records,
                        index;

                    // remove the Models from the source Store
                    data.view.store.remove(records);

                    index = store.indexOf(dropRecord);
                    if (position === 'after') {
                        index++;
                    }
                    store.insert(index, records);
                    view.getSelectionModel().select(records);
                }
            });
        }
    },

    onSelectionChange: function() {
        this.checkChange();
    },

    /**
     * Clears any values currently selected.
     */
    clearValue: function() {
        this.setValue([]);
    },

    /**
     * Return the value(s) to be submitted for this field. The returned value depends on the {@link #delimiter}
     * config: If it is set to a String value (like the default ',') then this will return the selected values
     * joined by the delimiter. If it is set to <tt>null</tt> then the values will be returned as an Array.
     */
    getSubmitValue: function() {
        var me = this,
            delimiter = me.delimiter,
            val = me.getValue();
        return Ext.isString(delimiter) ? val.join(delimiter) : val;
    },

    // inherit docs
    getRawValue: function() {
        var me = this,
            boundList = me.boundList;
        if (boundList) {
            me.rawValue = Ext.Array.map(boundList.getSelectionModel().getSelection(), function(model) {
                return model.get(me.valueField);
            });
        }
        return me.rawValue;
    },

    // inherit docs
    setRawValue: function(value) {
        var me = this,
            boundList = me.boundList,
            models;

        value = Ext.Array.from(value);
        me.rawValue = value;

        if (boundList) {
            models = [];
            Ext.Array.forEach(value, function(val) {
                var undef,
                    model = me.store.findRecord(me.valueField, val, undef, undef, true, true);
                if (model) {
                    models.push(model);
                }
            });
            boundList.getSelectionModel().select(models, false, true);
        }

        return value;
    },

    // no conversion
    valueToRaw: function(value) {
        return value;
    },

    // compare array values
    isEqual: function(v1, v2) {
        var fromArray = Ext.Array.from,
            i, len;

        v1 = fromArray(v1);
        v2 = fromArray(v2);
        len = v1.length;

        if (len !== v2.length) {
            return false;
        }

        for(i = 0; i < len; i++) {
            if (v2[i] !== v1[i]) {
                return false;
            }
        }

        return true;
    },

    getErrors : function(value) {
        var me = this,
            format = Ext.String.format,
            errors = me.callParent(arguments),
            numSelected;

        value = Ext.Array.from(value || me.getValue());
        numSelected = value.length;

        if (!me.allowBlank && numSelected < 1) {
            errors.push(me.blankText);
        }
        if (numSelected < this.minSelections) {
            errors.push(format(me.minSelectionsText, me.minSelections));
        }
        if (numSelected > this.maxSelections) {
            errors.push(format(me.maxSelectionsText, me.maxSelections));
        }

        return errors;
    },

    onDisable: function() {
        this.callParent();
        this.disabled = true;
        this.updateReadOnly();
    },

    onEnable: function() {
        this.callParent();
        this.disabled = false;
        this.updateReadOnly();
    },

    setReadOnly: function(readOnly) {
        this.readOnly = readOnly;
        this.updateReadOnly();
    },

    /**
     * @private Lock or unlock the BoundList's selection model to match the current disabled/readonly state
     */
    updateReadOnly: function() {
        var me = this,
            boundList = me.boundList,
            readOnly = me.readOnly || me.disabled;
        if (boundList) {
            boundList.getSelectionModel().setLocked(readOnly);
        }
    },

    onDestroy: function(){
        Ext.destroyMembers(this, 'panel', 'boundList', 'dragZone', 'dropZone');
        this.callParent();
    }
});