/*

This file is part of Ext JS 4

Copyright (c) 2011 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.

*/
/**
 * @class Ext.ux.LiveSearchGridPanel
 * @extends Ext.grid.Panel
 * <p>A GridPanel class with live search support.</p>
 * @author Nicolas Ferrero
 */
Ext.define('Ext.ux.LiveSearchGridPanel', {
    extend: 'Ext.grid.Panel',
    requires: [
        'Ext.toolbar.TextItem',
        'Ext.form.field.Checkbox',
        'Ext.form.field.Text',
        'Ext.ux.statusbar.StatusBar'
    ],
    
    /**
     * @private
     * search value initialization
     */
    searchValue: null,
    
    /**
     * @private
     * The row indexes where matching strings are found. (used by previous and next buttons)
     */
    indexes: [],
    
    /**
     * @private
     * The row index of the first search, it could change if next or previous buttons are used.
     */
    currentIndex: null,
    
    /**
     * @private
     * The generated regular expression used for searching.
     */
    searchRegExp: null,
    
    /**
     * @private
     * Case sensitive mode.
     */
    caseSensitive: false,
    
    /**
     * @private
     * Regular expression mode.
     */
    regExpMode: false,
    
    /**
     * @cfg {String} matchCls
     * The matched string css classe.
     */
    matchCls: 'x-livesearch-match',
    
    defaultStatusText: 'Nothing Found',
    
    // Component initialization override: adds the top and bottom toolbars and setup headers renderer.
    initComponent: function() {
        var me = this;
        me.tbar = ['Search',{
                 xtype: 'textfield',
                 name: 'searchField',
                 hideLabel: true,
                 width: 200,
                 listeners: {
                     change: {
                         fn: me.onTextFieldChange,
                         scope: this,
                         buffer: 100
                     }
                 }
            }, {
                xtype: 'button',
                text: '<',
                tooltip: 'Find Previous Row',
                handler: me.onPreviousClick,
                scope: me
            },{
                xtype: 'button',
                text: '>',
                tooltip: 'Find Next Row',
                handler: me.onNextClick,
                scope: me
            }, '-', {
                xtype: 'checkbox',
                hideLabel: true,
                margin: '0 0 0 4px',
                handler: me.regExpToggle,
                scope: me                
            }, 'Regular expression', {
                xtype: 'checkbox',
                hideLabel: true,
                margin: '0 0 0 4px',
                handler: me.caseSensitiveToggle,
                scope: me
            }, 'Case sensitive'];

        me.bbar = Ext.create('Ext.ux.StatusBar', {
            defaultText: me.defaultStatusText,
            name: 'searchStatusBar'
        });
        
        me.callParent(arguments);
    },
    
    // afterRender override: it adds textfield and statusbar reference and start monitoring keydown events in textfield input 
    afterRender: function() {
        var me = this;
        me.callParent(arguments);
        me.textField = me.down('textfield[name=searchField]');
        me.statusBar = me.down('statusbar[name=searchStatusBar]');
    },
    // detects html tag
    tagsRe: /<[^>]*>/gm,
    
    // DEL ASCII code
    tagsProtect: '\x0f',
    
    // detects regexp reserved word
    regExpProtect: /\\|\/|\+|\\|\.|\[|\]|\{|\}|\?|\$|\*|\^|\|/gm,
    
    /**
     * In normal mode it returns the value with protected regexp characters.
     * In regular expression mode it returns the raw value except if the regexp is invalid.
     * @return {String} The value to process or null if the textfield value is blank or invalid.
     * @private
     */
    getSearchValue: function() {
        var me = this,
            value = me.textField.getValue();
            
        if (value === '') {
            return null;
        }
        if (!me.regExpMode) {
            value = value.replace(me.regExpProtect, function(m) {
                return '\\' + m;
            });
        } else {
            try {
                new RegExp(value);
            } catch (error) {
                me.statusBar.setStatus({
                    text: error.message,
                    iconCls: 'x-status-error'
                });
                return null;
            }
            // this is stupid
            if (value === '^' || value === '$') {
                return null;
            }
        }

        return value;
    },
    
    /**
     * Finds all strings that matches the searched value in each grid cells.
     * @private
     */
     onTextFieldChange: function() {
         var me = this,
             count = 0;

         me.view.refresh();
         // reset the statusbar
         me.statusBar.setStatus({
             text: me.defaultStatusText,
             iconCls: ''
         });

         me.searchValue = me.getSearchValue();
         me.indexes = [];
         me.currentIndex = null;

         if (me.searchValue !== null) {
             me.searchRegExp = new RegExp(me.searchValue, 'g' + (me.caseSensitive ? '' : 'i'));
             
             
             me.store.each(function(record, idx) {
                 var td = Ext.fly(me.view.getNode(idx)).down('td'),
                     cell, matches, cellHTML;
                 while(td) {
                     cell = td.down('.x-grid-cell-inner');
                     matches = cell.dom.innerHTML.match(me.tagsRe);
                     cellHTML = cell.dom.innerHTML.replace(me.tagsRe, me.tagsProtect);
                     
                     // populate indexes array, set currentIndex, and replace wrap matched string in a span
                     cellHTML = cellHTML.replace(me.searchRegExp, function(m) {
                        count += 1;
                        if (Ext.Array.indexOf(me.indexes, idx) === -1) {
                            me.indexes.push(idx);
                        }
                        if (me.currentIndex === null) {
                            me.currentIndex = idx;
                        }
                        return '<span class="' + me.matchCls + '">' + m + '</span>';
                     });
                     // restore protected tags
                     Ext.each(matches, function(match) {
                        cellHTML = cellHTML.replace(me.tagsProtect, match); 
                     });
                     // update cell html
                     cell.dom.innerHTML = cellHTML;
                     td = td.next();
                 }
             }, me);

             // results found
             if (me.currentIndex !== null) {
                 me.getSelectionModel().select(me.currentIndex);
                 me.statusBar.setStatus({
                     text: count + ' matche(s) found.',
                     iconCls: 'x-status-valid'
                 });
             }
         }

         // no results found
         if (me.currentIndex === null) {
             me.getSelectionModel().deselectAll();
         }

         // force textfield focus
         me.textField.focus();
     },
    
    /**
     * Selects the previous row containing a match.
     * @private
     */   
    onPreviousClick: function() {
        var me = this,
            idx;
            
        if ((idx = Ext.Array.indexOf(me.indexes, me.currentIndex)) !== -1) {
            me.currentIndex = me.indexes[idx - 1] || me.indexes[me.indexes.length - 1];
            me.getSelectionModel().select(me.currentIndex);
         }
    },
    
    /**
     * Selects the next row containing a match.
     * @private
     */    
    onNextClick: function() {
         var me = this,
             idx;
             
         if ((idx = Ext.Array.indexOf(me.indexes, me.currentIndex)) !== -1) {
            me.currentIndex = me.indexes[idx + 1] || me.indexes[0];
            me.getSelectionModel().select(me.currentIndex);
         }
    },
    
    /**
     * Switch to case sensitive mode.
     * @private
     */    
    caseSensitiveToggle: function(checkbox, checked) {
        this.caseSensitive = checked;
        this.onTextFieldChange();
    },
    
    /**
     * Switch to regular expression mode
     * @private
     */
    regExpToggle: function(checkbox, checked) {
        this.regExpMode = checked;
        this.onTextFieldChange();
    }
});
