/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * A {@link Ext.form.FieldContainer field container} which has a specialized layout for arranging
 * {@link Ext.form.field.Checkbox} controls into columns, and provides convenience
 * {@link Ext.form.field.Field} methods for {@link #getValue getting}, {@link #setValue setting},
 * and {@link #validate validating} the group of checkboxes as a whole.
 *
 * # Validation
 *
 * Individual checkbox fields themselves have no default validation behavior, but
 * sometimes you want to require a user to select at least one of a group of checkboxes. CheckboxGroup
 * allows this by setting the config `{@link #allowBlank}:false`; when the user does not check at
 * least one of the checkboxes, the entire group will be highlighted as invalid and the
 * {@link #blankText error message} will be displayed according to the {@link #msgTarget} config.
 *
 * # Layout
 *
 * The default layout for CheckboxGroup makes it easy to arrange the checkboxes into
 * columns; see the {@link #columns} and {@link #vertical} config documentation for details. You may also
 * use a completely different layout by setting the {@link #layout} to one of the other supported layout
 * types; for instance you may wish to use a custom arrangement of hbox and vbox containers. In that case
 * the checkbox components at any depth will still be managed by the CheckboxGroup's validation.
 *
 *     @example
 *     Ext.create('Ext.form.Panel', {
 *         title: 'Checkbox Group',
 *         width: 300,
 *         height: 125,
 *         bodyPadding: 10,
 *         renderTo: Ext.getBody(),
 *         items:[{
 *             xtype: 'checkboxgroup',
 *             fieldLabel: 'Two Columns',
 *             // Arrange checkboxes into two columns, distributed vertically
 *             columns: 2,
 *             vertical: true,
 *             items: [
 *                 { boxLabel: 'Item 1', name: 'rb', inputValue: '1' },
 *                 { boxLabel: 'Item 2', name: 'rb', inputValue: '2', checked: true },
 *                 { boxLabel: 'Item 3', name: 'rb', inputValue: '3' },
 *                 { boxLabel: 'Item 4', name: 'rb', inputValue: '4' },
 *                 { boxLabel: 'Item 5', name: 'rb', inputValue: '5' },
 *                 { boxLabel: 'Item 6', name: 'rb', inputValue: '6' }
 *             ]
 *         }]
 *     });
 */
Ext.define('Ext.form.CheckboxGroup', {
    extend:'Ext.form.FieldContainer',
    mixins: {
        field: 'Ext.form.field.Field'
    },
    alias: 'widget.checkboxgroup',
    requires: [
        'Ext.layout.container.CheckboxGroup',
        'Ext.form.field.Checkbox',
        'Ext.form.field.Base'
    ],

    /**
     * @cfg {String} name
     * @private
     */

    /**
     * @cfg {Ext.form.field.Checkbox[]/Object[]} items
     * An Array of {@link Ext.form.field.Checkbox Checkbox}es or Checkbox config objects to arrange in the group.
     */

    /**
     * @cfg {String/Number/Number[]} columns
     * Specifies the number of columns to use when displaying grouped checkbox/radio controls using automatic layout.
     * This config can take several types of values:
     *
     * - 'auto' - The controls will be rendered one per column on one row and the width of each column will be evenly
     *   distributed based on the width of the overall field container. This is the default.
     * - Number - If you specific a number (e.g., 3) that number of columns will be created and the contained controls
     *   will be automatically distributed based on the value of {@link #vertical}.
     * - Array - You can also specify an array of column widths, mixing integer (fixed width) and float (percentage
     *   width) values as needed (e.g., [100, .25, .75]). Any integer values will be rendered first, then any float
     *   values will be calculated as a percentage of the remaining space. Float values do not have to add up to 1
     *   (100%) although if you want the controls to take up the entire field container you should do so.
     */
    columns : 'auto',

    /**
     * @cfg {Boolean} vertical
     * True to distribute contained controls across columns, completely filling each column top to bottom before
     * starting on the next column. The number of controls in each column will be automatically calculated to keep
     * columns as even as possible. The default value is false, so that controls will be added to columns one at a time,
     * completely filling each row left to right before starting on the next row.
     */
    vertical : false,

    /**
     * @cfg {Boolean} allowBlank
     * False to validate that at least one item in the group is checked. If no items are selected at
     * validation time, {@link #blankText} will be used as the error text.
     */
    allowBlank : true,

    //<locale>
    /**
     * @cfg {String} blankText
     * Error text to display if the {@link #allowBlank} validation fails
     */
    blankText : "You must select at least one item in this group",
    //</locale>

    // private
    defaultType : 'checkboxfield',

    // private
    groupCls : Ext.baseCSSPrefix + 'form-check-group',

    // private
    extraFieldBodyCls: Ext.baseCSSPrefix + 'form-checkboxgroup-body',

    // private
    layout: 'checkboxgroup',

    componentCls: Ext.baseCSSPrefix + 'form-checkboxgroup',

    initComponent: function() {
        var me = this;
        me.callParent();
        me.initField();
    },

    /**
     * Initializes the field's value based on the initial config. If the {@link #value} config is specified then we use
     * that to set the value; otherwise we initialize the originalValue by querying the values of all sub-checkboxes
     * after they have been initialized.
     * @protected
     */
    initValue: function() {
        var me = this,
            valueCfg = me.value;
        me.originalValue = me.lastValue = valueCfg || me.getValue();
        if (valueCfg) {
            me.setValue(valueCfg);
        }
    },

    /**
     * When a checkbox is added to the group, monitor it for changes
     * @param {Object} field
     * @protected
     */
    onAdd: function(item) {
        var me = this,
            items,
            len, i;

        if (item.isCheckbox) {
            me.mon(item, 'change', me.checkChange, me);
        } else if (item.isContainer) {
            items = item.items.items;
            for (i = 0, len = items.length; i < len; i++) {
                me.onAdd(items[i]);
            }
        }
        me.callParent(arguments);
    },

    onRemove: function(item) {
        var me = this,
            items,
            len, i;

        if (item.isCheckbox) {
            me.mun(item, 'change', me.checkChange, me);
        } else if (item.isContainer) {
            items = item.items.items;
            for (i = 0, len = items.length; i < len; i++) {
                me.onRemove(items[i]);
            }
        }
        me.callParent(arguments);
    },

    // private override - the group value is a complex object, compare using object serialization
    isEqual: function(value1, value2) {
        var toQueryString = Ext.Object.toQueryString;
        return toQueryString(value1) === toQueryString(value2);
    },

    /**
     * Runs CheckboxGroup's validations and returns an array of any errors. The only error by default is if allowBlank
     * is set to true and no items are checked.
     * @return {String[]} Array of all validation errors
     */
    getErrors: function() {
        var errors = [];
        if (!this.allowBlank && Ext.isEmpty(this.getChecked())) {
            errors.push(this.blankText);
        }
        return errors;
    },

    /**
     * @private Returns all checkbox components within the container
     * @param {String} [query] An additional query to add to the selector.
     */
    getBoxes: function(query) {
        return this.query('[isCheckbox]' + (query||''));
    },

    /**
     * @private Convenience function which calls the given function for every checkbox in the group
     * @param {Function} fn The function to call
     * @param {Object} [scope] scope object
     */
    eachBox: function(fn, scope) {
        Ext.Array.forEach(this.getBoxes(), fn, scope || this);
    },

    /**
     * Returns an Array of all checkboxes in the container which are currently checked
     * @return {Ext.form.field.Checkbox[]} Array of Ext.form.field.Checkbox components
     */
    getChecked: function() {
        return this.getBoxes('[checked]');
    },

    // private override
    isDirty: function(){
        var boxes = this.getBoxes(),
            b ,
            bLen  = boxes.length;

        for (b = 0; b < bLen; b++) {
            if (boxes[b].isDirty()) {
                return true;
            }
        }
    },

    // private override
    setReadOnly: function(readOnly) {
        var boxes = this.getBoxes(),
            b,
            bLen  = boxes.length;

        for (b = 0; b < bLen; b++) {
            boxes[b].setReadOnly(readOnly);
        }

        this.readOnly = readOnly;
    },

    /**
     * Resets the checked state of all {@link Ext.form.field.Checkbox checkboxes} in the group to their originally
     * loaded values and clears any validation messages.
     * See {@link Ext.form.Basic}.{@link Ext.form.Basic#trackResetOnLoad trackResetOnLoad}
     */
    reset: function() {
        var me = this,
            hadError = me.hasActiveError(),
            preventMark = me.preventMark;
        me.preventMark = true;
        me.batchChanges(function() {
            var boxes = me.getBoxes(),
                b,
                bLen  = boxes.length;

            for (b = 0; b < bLen; b++) {
                boxes[b].reset();
            }
        });
        me.preventMark = preventMark;
        me.unsetActiveError();
        if (hadError) {
            me.updateLayout();
        }
    },

    resetOriginalValue: function(){
        var me    = this,
            boxes = me.getBoxes(),
            b,
            bLen  = boxes.length;

        for (b = 0; b < bLen; b++) {
            boxes[b].resetOriginalValue();
        }

        me.originalValue = me.getValue();
        me.checkDirty();
    },


    /**
     * Sets the value(s) of all checkboxes in the group. The expected format is an Object of name-value pairs
     * corresponding to the names of the checkboxes in the group. Each pair can have either a single or multiple values:
     *
     *   - A single Boolean or String value will be passed to the `setValue` method of the checkbox with that name.
     *     See the rules in {@link Ext.form.field.Checkbox#setValue} for accepted values.
     *   - An Array of String values will be matched against the {@link Ext.form.field.Checkbox#inputValue inputValue}
     *     of checkboxes in the group with that name; those checkboxes whose inputValue exists in the array will be
     *     checked and others will be unchecked.
     *
     * If a checkbox's name is not in the mapping at all, it will be unchecked.
     *
     * An example:
     *
     *     var myCheckboxGroup = new Ext.form.CheckboxGroup({
     *         columns: 3,
     *         items: [{
     *             name: 'cb1',
     *             boxLabel: 'Single 1'
     *         }, {
     *             name: 'cb2',
     *             boxLabel: 'Single 2'
     *         }, {
     *             name: 'cb3',
     *             boxLabel: 'Single 3'
     *         }, {
     *             name: 'cbGroup',
     *             boxLabel: 'Grouped 1'
     *             inputValue: 'value1'
     *         }, {
     *             name: 'cbGroup',
     *             boxLabel: 'Grouped 2'
     *             inputValue: 'value2'
     *         }, {
     *             name: 'cbGroup',
     *             boxLabel: 'Grouped 3'
     *             inputValue: 'value3'
     *         }]
     *     });
     *
     *     myCheckboxGroup.setValue({
     *         cb1: true,
     *         cb3: false,
     *         cbGroup: ['value1', 'value3']
     *     });
     *
     * The above code will cause the checkbox named 'cb1' to be checked, as well as the first and third checkboxes named
     * 'cbGroup'. The other three checkboxes will be unchecked.
     *
     * @param {Object} value The mapping of checkbox names to values.
     * @return {Ext.form.CheckboxGroup} this
     */
    setValue: function(value) {
        var me    = this,
            boxes = me.getBoxes(),
            b,
            bLen  = boxes.length,
            box, name,
            cbValue;

        me.batchChanges(function() {
            for (b = 0; b < bLen; b++) {
                box = boxes[b];
                name = box.getName();
                cbValue = false;

                if (value && value.hasOwnProperty(name)) {
                    if (Ext.isArray(value[name])) {
                        cbValue = Ext.Array.contains(value[name], box.inputValue);
                    } else {
                        // single value, let the checkbox's own setValue handle conversion
                        cbValue = value[name];
                    }
                }

                box.setValue(cbValue);
            }
        });
        return me;
    },


    /**
     * Returns an object containing the values of all checked checkboxes within the group. Each key-value pair in the
     * object corresponds to a checkbox {@link Ext.form.field.Checkbox#name name}. If there is only one checked checkbox
     * with a particular name, the value of that pair will be the String {@link Ext.form.field.Checkbox#inputValue
     * inputValue} of that checkbox. If there are multiple checked checkboxes with that name, the value of that pair
     * will be an Array of the selected inputValues.
     *
     * The object format returned from this method can also be passed directly to the {@link #setValue} method.
     *
     * NOTE: In Ext 3, this method returned an array of Checkbox components; this was changed to make it more consistent
     * with other field components and with the {@link #setValue} argument signature. If you need the old behavior in
     * Ext 4+, use the {@link #getChecked} method instead.
     */
    getValue: function() {
        var values = {},
            boxes  = this.getBoxes(),
            b,
            bLen   = boxes.length,
            box, name, inputValue, bucket;

        for (b = 0; b < bLen; b++) {
            box        = boxes[b];
            name       = box.getName();
            inputValue = box.inputValue;

            if (box.getValue()) {
                if (values.hasOwnProperty(name)) {
                    bucket = values[name];
                    if (!Ext.isArray(bucket)) {
                        bucket = values[name] = [bucket];
                    }
                    bucket.push(inputValue);
                } else {
                    values[name] = inputValue;
                }
            }
        }

        return values;
    },

    /*
     * Don't return any data for submit; the form will get the info from the individual checkboxes themselves.
     */
    getSubmitData: function() {
        return null;
    },

    /*
     * Don't return any data for the model; the form will get the info from the individual checkboxes themselves.
     */
    getModelData: function() {
        return null;
    },

    validate: function() {
        var me = this,
            errors,
            isValid,
            wasValid;

        if (me.disabled) {
            isValid = true;
        } else {
            errors = me.getErrors();
            isValid = Ext.isEmpty(errors);
            wasValid = me.wasValid;
            if (isValid) {
                me.unsetActiveError();
            } else {
                me.setActiveError(errors);
            }
        }
        if (isValid !== wasValid) {
            me.wasValid = isValid;
            me.fireEvent('validitychange', me, isValid);
            me.updateLayout();
        }

        return isValid;
    }

}, function() {

    this.borrow(Ext.form.field.Base, ['markInvalid', 'clearInvalid', 'setError']);

});

