/**
 * @class Ext.form.TextField
 * @extends Ext.form.Field
 * 
Basic text field.  Can be used as a direct replacement for traditional text inputs,
 * or as the base class for more sophisticated input controls (like {@link Ext.form.TextArea}
 * and {@link Ext.form.ComboBox}).
 * 
Validation
 * 
Field validation is processed in a particular order.  If validation fails at any particular
 * step the validation routine halts.
 * 

 * 
1. Field specific validator
 * 

 * 
If a field is configured with a {@link Ext.form.TextField#validator validator} function,
 * it will be passed the current field value.  The {@link Ext.form.TextField#validator validator}
 * function is expected to return boolean true if the value is valid or return a string to
 * represent the invalid message if invalid.
 * 
 * 
2. Built in Validation
 * 

 * 
Basic validation is affected with the following configuration properties:
 * 
 * Validation    Invalid Message
 * {@link Ext.form.TextField#allowBlank allowBlank}    {@link Ext.form.TextField#emptyText emptyText}
 * {@link Ext.form.TextField#minLength minLength}     {@link Ext.form.TextField#minLengthText minLengthText}
 * {@link Ext.form.TextField#maxLength maxLength}     {@link Ext.form.TextField#maxLengthText maxLengthText}
 * 
 * 
 * 
3. Preconfigured Validation Types (VTypes)
 * 

 * 
Using VTypes offers a convenient way to reuse validation. If a field is configured with a
 * {@link Ext.form.TextField#vtype vtype}, the corresponding {@link Ext.form.VTypes VTypes}
 * validation function will be used for validation.  If invalid, either the field's
 * {@link Ext.form.TextField#vtypeText vtypeText} or the VTypes vtype Text property will be
 * used for the invalid message.  Keystrokes on the field will be filtered according to the VTypes
 * vtype Mask property.
 * 
 * 
4. Field specific regex test
 * 

 * 
Each field may also specify a {@link Ext.form.TextField#regex regex} test.
 * The invalid message for this test is configured with
 * {@link Ext.form.TextField#regexText regexText}.
 * 
 * 
Alter Validation Behavior
 * 

 * 
Validation behavior for each field can be configured:

 * 
{@link Ext.form.TextField#invalidText invalidText} : the default validation message to
 * show if any validation step above does not provide a message when invalid
 * 
{@link Ext.form.TextField#maskRe maskRe} : filter out keystrokes before any validation occurs
 * 
{@link Ext.form.TextField#stripCharsRe stripCharsRe} : filter characters after being typed in,
 * but before being validated
 * 
{@link Ext.form.Field#invalidClass invalidClass} : alternate style when invalid
 * 
{@link Ext.form.Field#validateOnBlur validateOnBlur},
 * {@link Ext.form.Field#validationDelay validationDelay}, and
 * {@link Ext.form.Field#validationEvent validationEvent} : modify how/when validation is triggered
 * 
 * 
 * 
 * @constructor
 * Creates a new TextField
 * @param {Object} config Configuration options
 * @xtype textfield
 */
Ext.form.TextField = Ext.extend(Ext.form.Field,  {
    
/**
     * @cfg {String} vtypeText A custom error message to display in place of the default message provided
     * for the {@link #vtype} currently set for this field (defaults to '').  Note:
     * only applies if {@link #vtype} is set, else ignored.
     */
    
/**
     * @cfg {RegExp} stripCharsRe A JavaScript RegExp object used to strip unwanted content from the value
     * before validation (defaults to null).
     */
    
/**
     * @cfg {Boolean} grow true if this field should automatically grow and shrink to its content
     * (defaults to false)
     */
    grow : false,
    
/**
     * @cfg {Number} growMin The minimum width to allow when {@link #grow} = true (defaults
     * to 30)
     */
    growMin : 30,
    
/**
     * @cfg {Number} growMax The maximum width to allow when {@link #grow} = true (defaults
     * to 800)
     */
    growMax : 800,
    
/**
     * @cfg {String} vtype A validation type name as defined in {@link Ext.form.VTypes} (defaults to null)
     */
    vtype : null,
    
/**
     * @cfg {RegExp} maskRe An input mask regular expression that will be used to filter keystrokes that do
     * not match (defaults to null)
     */
    maskRe : null,
    
/**
     * @cfg {Boolean} disableKeyFilter Specify true to disable input keystroke filtering (defaults
     * to false)
     */
    disableKeyFilter : false,
    
/**
     * @cfg {Boolean} allowBlank Specify false to validate that the value's length is > 0 (defaults to
     * true)
     */
    allowBlank : true,
    
/**
     * @cfg {Number} minLength Minimum input field length required (defaults to 0)
     */
    minLength : 0,
    
/**
     * @cfg {Number} maxLength Maximum input field length allowed by validation (defaults to Number.MAX_VALUE).
     * This behavior is intended to provide instant feedback to the user by improving usability to allow pasting
     * and editing or overtyping and back tracking. To restrict the maximum number of characters that can be
     * entered into the field use {@link Ext.form.Field#autoCreate autoCreate} to add
     * any attributes you want to a field, for example:

var myField = new Ext.form.NumberField({
    id: 'mobile',
    anchor:'90%',
    fieldLabel: 'Mobile',
    maxLength: 16, // for validation
    autoCreate: {tag: 'input', type: 'text', size: '20', autocomplete: 'off', maxlength: '10'}
});

     */
    maxLength : Number.MAX_VALUE,
    
/**
     * @cfg {String} minLengthText Error text to display if the {@link #minLength minimum length}
     * validation fails (defaults to 'The minimum length for this field is {minLength}')
     */
    minLengthText : 'The minimum length for this field is {0}',
    
/**
     * @cfg {String} maxLengthText Error text to display if the {@link #maxLength maximum length}
     * validation fails (defaults to 'The maximum length for this field is {maxLength}')
     */
    maxLengthText : 'The maximum length for this field is {0}',
    
/**
     * @cfg {Boolean} selectOnFocus true to automatically select any existing field text when the field
     * receives input focus (defaults to false)
     */
    selectOnFocus : false,
    
/**
     * @cfg {String} blankText The error text to display if the {@link #allowBlank} validation
     * fails (defaults to 'This field is required')
     */
    blankText : 'This field is required',
    
/**
     * @cfg {Function} validator A custom validation function to be called during field validation
     * (defaults to null). If specified, this function will be called first, allowing the
     * developer to override the default validation process. This function will be passed the current
     * field value and expected to return boolean true if the value is valid or a string
     * error message if invalid.
     */
    validator : null,
    
/**
     * @cfg {RegExp} regex A JavaScript RegExp object to be tested against the field value during validation
     * (defaults to null). If the test fails, the field will be marked invalid using
     * {@link #regexText}.
     */
    regex : null,
    
/**
     * @cfg {String} regexText The error text to display if {@link #regex} is used and the
     * test fails during validation (defaults to '')
     */
    regexText : '',
    
/**
     * @cfg {String} emptyText The default text to place into an empty field (defaults to null).
     * Note: that this value will be submitted to the server if this field is enabled and configured
     * with a {@link #name}.
     */
    emptyText : null,
    
/**
     * @cfg {String} emptyClass The CSS class to apply to an empty field to style the {@link #emptyText}
     * (defaults to 'x-form-empty-field').  This class is automatically added and removed as needed
     * depending on the current field value.
     */
    emptyClass : 'x-form-empty-field',

    
/**
     * @cfg {Boolean} enableKeyEvents true to enable the proxying of key events for the HTML input
     * field (defaults to false)
     */

    initComponent : function(){
        Ext.form.TextField.superclass.initComponent.call(this);
        this.addEvents(
            
/**
             * @event autosize
             * Fires when the {@link #autoSize} function is triggered. The field may or
             * may not have actually changed size according to the default logic, but this event provides
             * a hook for the developer to apply additional logic at runtime to resize the field if needed.
             * @param {Ext.form.Field} this This text field
             * @param {Number} width The new field width
             */
            'autosize',

            
/**
             * @event keydown
             * Keydown input field event. This event only fires if {@link #enableKeyEvents}
             * is set to true.
             * @param {Ext.form.TextField} this This text field
             * @param {Ext.EventObject} e
             */
            'keydown',
            
/**
             * @event keyup
             * Keyup input field event. This event only fires if {@link #enableKeyEvents}
             * is set to true.
             * @param {Ext.form.TextField} this This text field
             * @param {Ext.EventObject} e
             */
            'keyup',
            
/**
             * @event keypress
             * Keypress input field event. This event only fires if {@link #enableKeyEvents}
             * is set to true.
             * @param {Ext.form.TextField} this This text field
             * @param {Ext.EventObject} e
             */
            'keypress'
        );
    },

    // private
    initEvents : function(){
        Ext.form.TextField.superclass.initEvents.call(this);
        if(this.validationEvent == 'keyup'){
            this.validationTask = new Ext.util.DelayedTask(this.validate, this);
            this.mon(this.el, 'keyup', this.filterValidation, this);
        }
        else if(this.validationEvent !== false){
        	this.mon(this.el, this.validationEvent, this.validate, this, {buffer: this.validationDelay});
        }
        if(this.selectOnFocus || this.emptyText){
            this.on('focus', this.preFocus, this);
            
            this.mon(this.el, 'mousedown', function(){
                if(!this.hasFocus){
                    this.el.on('mouseup', function(e){
                        e.preventDefault();
                    }, this, {single:true});
                }
            }, this);
            
            if(this.emptyText){
                this.on('blur', this.postBlur, this);
                this.applyEmptyText();
            }
        }
        if(this.maskRe || (this.vtype && this.disableKeyFilter !== true && (this.maskRe = Ext.form.VTypes[this.vtype+'Mask']))){
        	this.mon(this.el, 'keypress', this.filterKeys, this);
        }
        if(this.grow){
        	this.mon(this.el, 'keyup', this.onKeyUpBuffered, this, {buffer: 50});
			this.mon(this.el, 'click', this.autoSize, this);
        }
        if(this.enableKeyEvents){
        	this.mon(this.el, 'keyup', this.onKeyUp, this);
        	this.mon(this.el, 'keydown', this.onKeyDown, this);
        	this.mon(this.el, 'keypress', this.onKeyPress, this);
        }
    },

    processValue : function(value){
        if(this.stripCharsRe){
            var newValue = value.replace(this.stripCharsRe, '');
            if(newValue !== value){
                this.setRawValue(newValue);
                return newValue;
            }
        }
        return value;
    },

    filterValidation : function(e){
        if(!e.isNavKeyPress()){
            this.validationTask.delay(this.validationDelay);
        }
    },
    
    //private
    onDisable: function(){
        Ext.form.TextField.superclass.onDisable.call(this);
        if(Ext.isIE){
            this.el.dom.unselectable = 'on';
        }
    },
    
    //private
    onEnable: function(){
        Ext.form.TextField.superclass.onEnable.call(this);
        if(Ext.isIE){
            this.el.dom.unselectable = '';
        }
    },

    // private
    onKeyUpBuffered : function(e){
        if(!e.isNavKeyPress()){
            this.autoSize();
        }
    },

    // private
    onKeyUp : function(e){
        this.fireEvent('keyup', this, e);
    },

    // private
    onKeyDown : function(e){
        this.fireEvent('keydown', this, e);
    },

    // private
    onKeyPress : function(e){
        this.fireEvent('keypress', this, e);
    },

    
/**
     * Resets the current field value to the originally-loaded value and clears any validation messages.
     * Also adds {@link #emptyText} and {@link #emptyClass} if the
     * original value was blank.
     */
    reset : function(){
        Ext.form.TextField.superclass.reset.call(this);
        this.applyEmptyText();
    },

    applyEmptyText : function(){
        if(this.rendered && this.emptyText && this.getRawValue().length < 1 && !this.hasFocus){
            this.setRawValue(this.emptyText);
            this.el.addClass(this.emptyClass);
        }
    },

    // private
    preFocus : function(){
        var el = this.el;
        if(this.emptyText){
            if(el.dom.value == this.emptyText){
                this.setRawValue('');
            }
            el.removeClass(this.emptyClass);
        }
        if(this.selectOnFocus){
            (function(){
                el.dom.select();
            }).defer(this.inEditor && Ext.isIE ? 50 : 0);    
        }
    },

    // private
    postBlur : function(){
        this.applyEmptyText();
    },

    // private
    filterKeys : function(e){
        // special keys don't generate charCodes, so leave them alone
        if(e.ctrlKey || e.isSpecialKey()){
            return;
        }
        
        if(!this.maskRe.test(String.fromCharCode(e.getCharCode()))){
            e.stopEvent();
        }
    },

    setValue : function(v){
        if(this.emptyText && this.el && !Ext.isEmpty(v)){
            this.el.removeClass(this.emptyClass);
        }
        Ext.form.TextField.superclass.setValue.apply(this, arguments);
        this.applyEmptyText();
        this.autoSize();
        return this;
    },

    
/**
     * Validates a value according to the field's validation rules and marks the field as invalid
     * if the validation fails
     * @param {Mixed} value The value to validate
     * @return {Boolean} True if the value is valid, else false
     */
    validateValue : function(value){
        if(Ext.isFunction(this.validator)){
            var msg = this.validator(value);
            if(msg !== true){
                this.markInvalid(msg);
                return false;
            }
        }
        if(value.length < 1 || value === this.emptyText){ // if it's blank
             if(this.allowBlank){
                 this.clearInvalid();
                 return true;
             }else{
                 this.markInvalid(this.blankText);
                 return false;
             }
        }
        if(value.length < this.minLength){
            this.markInvalid(String.format(this.minLengthText, this.minLength));
            return false;
        }
        if(value.length > this.maxLength){
            this.markInvalid(String.format(this.maxLengthText, this.maxLength));
            return false;
        }	
        if(this.vtype){
            var vt = Ext.form.VTypes;
            if(!vt[this.vtype](value, this)){
                this.markInvalid(this.vtypeText || vt[this.vtype +'Text']);
                return false;
            }
        }
        if(this.regex && !this.regex.test(value)){
            this.markInvalid(this.regexText);
            return false;
        }
        return true;
    },

    
/**
     * Selects text in this field
     * @param {Number} start (optional) The index where the selection should start (defaults to 0)
     * @param {Number} end (optional) The index where the selection should end (defaults to the text length)
     */
    selectText : function(start, end){
        var v = this.getRawValue();
        var doFocus = false;
        if(v.length > 0){
            start = start === undefined ? 0 : start;
            end = end === undefined ? v.length : end;
            var d = this.el.dom;
            if(d.setSelectionRange){
                d.setSelectionRange(start, end);
            }else if(d.createTextRange){
                var range = d.createTextRange();
                range.moveStart('character', start);
                range.moveEnd('character', end-v.length);
                range.select();
            }
            doFocus = Ext.isGecko || Ext.isOpera;
        }else{
            doFocus = true;
        }
        if(doFocus){
            this.focus();
        }
    },

    
/**
     * Automatically grows the field to accomodate the width of the text up to the maximum field width allowed.
     * This only takes effect if {@link #grow} = true, and fires the {@link #autosize} event.
     */
    autoSize : function(){
        if(!this.grow || !this.rendered){
            return;
        }
        if(!this.metrics){
            this.metrics = Ext.util.TextMetrics.createInstance(this.el);
        }
        var el = this.el;
        var v = el.dom.value;
        var d = document.createElement('div');
        d.appendChild(document.createTextNode(v));
        v = d.innerHTML;
        d = null;
        Ext.removeNode(d);
        v += ' ';
        var w = Math.min(this.growMax, Math.max(this.metrics.getWidth(v) + /* add extra padding */ 10, this.growMin));
        this.el.setWidth(w);
        this.fireEvent('autosize', this, w);
    },
	
	onDestroy: function(){
		if(this.validationTask){
			this.validationTask.cancel();
			this.validationTask = null;
		}
		Ext.form.TextField.superclass.onDestroy.call(this);
	}
});
Ext.reg('textfield', Ext.form.TextField);