/**
 * @docauthor Jason Johnston <jason@sencha.com>
 *
 * A 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.field.TextArea}
 * and {@link Ext.form.field.ComboBox}). Has support for empty-field placeholder values (see {@link #emptyText}).
 *
 * # Validation
 *
 * The Text field has a useful set of validations built in:
 *
 * - {@link #allowBlank} for making the field required
 * - {@link #minLength} for requiring a minimum value length
 * - {@link #maxLength} for setting a maximum value length (with {@link #enforceMaxLength} to add it
 *   as the `maxlength` attribute on the input element)
 * - {@link #regex} to specify a custom regular expression for validation
 *
 * In addition, custom validations may be added:
 *
 * - {@link #vtype} specifies a virtual type implementation from {@link Ext.form.field.VTypes} which can contain
 *   custom validation logic
 * - {@link #validator} allows a custom arbitrary function to be called during validation
 *
 * The details around how and when each of these validation options get used are described in the
 * documentation for {@link #getErrors}.
 *
 * By default, the field value is checked for validity immediately while the user is typing in the
 * field. This can be controlled with the {@link #validateOnChange}, {@link #checkChangeEvents}, and
 * {@link #checkChangeBuffer} configurations. Also see the details on Form Validation in the
 * {@link Ext.form.Panel} class documentation.
 *
 * # Masking and Character Stripping
 *
 * Text fields can be configured with custom regular expressions to be applied to entered values before
 * validation: see {@link #maskRe} and {@link #stripCharsRe} for details.
 *
 * # Example usage
 *
 *     @example
 *     Ext.create('Ext.form.Panel', {
 *         title: 'Contact Info',
 *         width: 300,
 *         bodyPadding: 10,
 *         renderTo: Ext.getBody(),
 *         items: [{
 *             xtype: 'textfield',
 *             name: 'name',
 *             fieldLabel: 'Name',
 *             allowBlank: false  // requires a non-empty value
 *         }, {
 *             xtype: 'textfield',
 *             name: 'email',
 *             fieldLabel: 'Email Address',
 *             vtype: 'email'  // requires value to be a valid email address format
 *         }]
 *     });
 */
Ext.define('Ext.form.field.Text', {
    extend:'Ext.form.field.Base',
    alias: 'widget.textfield',
    requires: ['Ext.form.field.VTypes', 'Ext.layout.component.field.Text'],
    alternateClassName: ['Ext.form.TextField', 'Ext.form.Text'],

    /**
     * @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. **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
     * during input. If `stripCharsRe` is specified,
     * every *character sequence* matching `stripCharsRe` will be removed.
     */

    /**
     * @cfg {Number} size
     * An initial value for the 'size' attribute on the text input element. This is only used if the field has no
     * configured {@link #width} and is not given a width by its container's layout. Defaults to 20.
     */
    size: 20,

    /**
     * @cfg {Boolean} [grow=false]
     * true if this field should automatically grow and shrink to its content
     */

    /**
     * @cfg {Number} growMin
     * The minimum width to allow when `{@link #grow} = true`
     */
    growMin : 30,

    /**
     * @cfg {Number} growMax
     * The maximum width to allow when `{@link #grow} = true`
     */
    growMax : 800,

    /**
     * @cfg {String} growAppend
     * A string that will be appended to the field's current value for the purposes of calculating the target field
     * size. Only used when the {@link #grow} config is true. Defaults to a single capital "W" (the widest character in
     * common fonts) to leave enough space for the next typed character and avoid the field value shifting before the
     * width is adjusted.
     */
    //<locale>
    growAppend: 'W',
    //</locale>

    /**
     * @cfg {String} vtype
     * A validation type name as defined in {@link Ext.form.field.VTypes}
     */

    /**
     * @cfg {RegExp} maskRe An input mask regular expression that will be used to filter keystrokes (character being
     * typed) that do not match.
     * Note: It dose not filter characters already in the input.
     */

    /**
     * @cfg {Boolean} [disableKeyFilter=false]
     * Specify true to disable input keystroke filtering
     */

    /**
     * @cfg {Boolean} allowBlank
     * Specify false to validate that the value's length is > 0
     */
    allowBlank : true,

    /**
     * @cfg {Number} minLength
     * Minimum input field length required
     */
    minLength : 0,

    /**
     * @cfg {Number} maxLength
     * Maximum input field length allowed by validation. 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 the
     * **{@link Ext.form.field.Text#enforceMaxLength enforceMaxLength}** option.
     *
     * Defaults to Number.MAX_VALUE.
     */
    maxLength : Number.MAX_VALUE,

    /**
     * @cfg {Boolean} enforceMaxLength
     * True to set the maxLength property on the underlying input field. Defaults to false
     */

    /**
     * @cfg {String} minLengthText
     * Error text to display if the **{@link #minLength minimum length}** validation fails.
     */
    //<locale>
    minLengthText : 'The minimum length for this field is {0}',
    //</locale>

    /**
     * @cfg {String} maxLengthText
     * Error text to display if the **{@link #maxLength maximum length}** validation fails
     */
    //<locale>
    maxLengthText : 'The maximum length for this field is {0}',
    //</locale>

    /**
     * @cfg {Boolean} [selectOnFocus=false]
     * true to automatically select any existing field text when the field receives input focus
     */

    /**
     * @cfg {String} blankText
     * The error text to display if the **{@link #allowBlank}** validation fails
     */
    //<locale>
    blankText : 'This field is required',
    //</locale>

    /**
     * @cfg {Function} validator
     * A custom validation function to be called during field validation ({@link #getErrors}).
     * If specified, this function will be called first, allowing the developer to override the default validation
     * process.
     *
     * This function will be passed the following parameters:
     *
     * @cfg {Object} validator.value The current field value
     * @cfg {Boolean/String} validator.return
     *
     * - True if the value is valid
     * - An error message if the value is invalid
     */

    /**
     * @cfg {RegExp} regex
     * A JavaScript RegExp object to be tested against the field value during validation.
     * If the test fails, the field will be marked invalid using
     * either **{@link #regexText}** or **{@link #invalidText}**.
     */

    /**
     * @cfg {String} regexText
     * The error text to display if **{@link #regex}** is used and the test fails during validation
     */
    regexText : '',

    /**
     * @cfg {String} emptyText
     * The default text to place into an empty field.
     *
     * Note that normally this value will be submitted to the server if this field is enabled; to prevent this you can
     * set the {@link Ext.form.action.Action#submitEmptyText submitEmptyText} option of {@link Ext.form.Basic#submit} to
     * false.
     *
     * Also note that if you use {@link #inputType inputType}:'file', {@link #emptyText} is not supported and should be
     * avoided.
     *
     * Note that for browsers that support it, setting this property will use the HTML 5 placeholder attribute, and for
     * older browsers that don't support the HTML 5 placeholder attribute the value will be placed directly into the input
     * element itself as the raw value. This means that older browsers will obfuscate the {@link #emptyText} value for
     * password input fields.
     */

    /**
     * @cfg {String} [emptyCls='x-form-empty-field']
     * The CSS class to apply to an empty field to style the **{@link #emptyText}**.
     * This class is automatically added and removed as needed depending on the current field value.
     */
    emptyCls : Ext.baseCSSPrefix + 'form-empty-field',

    /**
     * @cfg {Boolean} [enableKeyEvents=false]
     * true to enable the proxying of key events for the HTML input field
     */

    componentLayout: 'textfield',

    initComponent: function () {
        var me = this;

        me.callParent();

        me.addEvents(
            /**
             * @event autosize
             * Fires when the **{@link #autoSize}** function is triggered and the field is resized according to the
             * {@link #grow}/{@link #growMin}/{@link #growMax} configs as a result. This event provides a hook for the
             * developer to apply additional logic at runtime to resize the field if needed.
             * @param {Ext.form.field.Text} 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.field.Text} 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.field.Text} 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.field.Text} this This text field
             * @param {Ext.EventObject} e
             */
            'keypress'
        );
        me.addStateEvents('change');
        me.setGrowSizePolicy();
    },
    
    setGrowSizePolicy: function(){
        if (this.grow) {
            this.shrinkWrap |= 1; // width must shrinkWrap
        }    
    },

    // private
    initEvents : function(){
        var me = this,
            el = me.inputEl;

        me.callParent();
        if(me.selectOnFocus || me.emptyText){
            me.mon(el, 'mousedown', me.onMouseDown, me);
        }
        if(me.maskRe || (me.vtype && me.disableKeyFilter !== true && (me.maskRe = Ext.form.field.VTypes[me.vtype+'Mask']))){
            me.mon(el, 'keypress', me.filterKeys, me);
        }

        if (me.enableKeyEvents) {
            me.mon(el, {
                scope: me,
                keyup: me.onKeyUp,
                keydown: me.onKeyDown,
                keypress: me.onKeyPress
            });
        }
    },

    /**
     * @private
     * Override. Treat undefined and null values as equal to an empty string value.
     */
    isEqual: function(value1, value2) {
        return this.isEqualAsString(value1, value2);
    },

    /**
     * @private
     * If grow=true, invoke the autoSize method when the field's value is changed.
     */
    onChange: function() {
        this.callParent();
        this.autoSize();
    },

    getSubTplData: function() {
        var me = this,
            value = me.getRawValue(),
            isEmpty = me.emptyText && value.length < 1,
            placeholder;

        if (isEmpty) {
            if (Ext.supports.Placeholder) {
                placeholder = me.emptyText;
            } else {
                value = me.emptyText;
            }
        }

        return Ext.apply(me.callParent(), {
            maxLength   : me.enforceMaxLength ? me.maxLength : undefined,
            readOnly    : me.readOnly,
            placeholder : placeholder,
            value       : value,
            fieldCls    : me.fieldCls + ((isEmpty && (placeholder || value)) ? ' ' + me.emptyCls : '')
        });
    },

    afterRender: function(){
        this.autoSize();
        this.callParent();
    },

    onMouseDown: function(e){
        var me = this;
        if(!me.hasFocus){
            me.mon(me.inputEl, 'mouseup', Ext.emptyFn, me, { single: true, preventDefault: true });
        }
    },

    /**
     * Performs any necessary manipulation of a raw String value to prepare it for conversion and/or
     * {@link #validate validation}. For text fields this applies the configured {@link #stripCharsRe}
     * to the raw value.
     * @param {String} value The unprocessed string value
     * @return {String} The processed string value
     */
    processRawValue: function(value) {
        var me = this,
            stripRe = me.stripCharsRe,
            newValue;

        if (stripRe) {
            newValue = value.replace(stripRe, '');
            if (newValue !== value) {
                me.setRawValue(newValue);
                value = newValue;
            }
        }
        return value;
    },

    //private
    onDisable: function(){
        this.callParent();
        if (Ext.isIE) {
            this.inputEl.dom.unselectable = 'on';
        }
    },

    //private
    onEnable: function(){
        this.callParent();
        if (Ext.isIE) {
            this.inputEl.dom.unselectable = '';
        }
    },

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

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

    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 #emptyCls}** if the original value was blank.
     */
    reset : function(){
        this.callParent();
        this.applyEmptyText();
    },

    applyEmptyText : function(){
        var me = this,
            emptyText = me.emptyText,
            isEmpty;

        if (me.rendered && emptyText) {
            isEmpty = me.getRawValue().length < 1 && !me.hasFocus;

            if (Ext.supports.Placeholder) {
                me.inputEl.dom.placeholder = emptyText;
            } else if (isEmpty) {
                me.setRawValue(emptyText);
            }

            //all browsers need this because of a styling issue with chrome + placeholders.
            //the text isnt vertically aligned when empty (and using the placeholder)
            if (isEmpty) {
                me.inputEl.addCls(me.emptyCls);
            }

            me.autoSize();
        }
    },
    
    afterFirstLayout: function() {
        this.callParent();
        if (Ext.isIE && this.disabled) {
            var el = this.inputEl;
            if (el) {
                el.dom.unselectable = 'on';
            }
        }
    },
    
    // private
    preFocus : function(){
        var me = this,
            inputEl = me.inputEl,
            emptyText = me.emptyText,
            isEmpty;

        me.callParent(arguments);
        if (emptyText && !Ext.supports.Placeholder && inputEl.dom.value === emptyText) {
            me.setRawValue('');
            isEmpty = true;
            inputEl.removeCls(me.emptyCls);
        } else if (Ext.supports.Placeholder) {
            me.inputEl.removeCls(me.emptyCls);
        }
        if (me.selectOnFocus || isEmpty) {
            inputEl.dom.select();
        }
    },

    onFocus: function() {
        var me = this;
        me.callParent(arguments);
        if (me.emptyText) {
            me.autoSize();
        }
    },

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

    // private
    filterKeys : function(e){
        /*
         * On European keyboards, the right alt key, Alt Gr, is used to type certain special characters.
         * JS detects a keypress of this as ctrlKey & altKey. As such, we check that alt isn't pressed
         * so we can still process these special characters.
         */
        if (e.ctrlKey && !e.altKey) {
            return;
        }
        var key = e.getKey(),
            charCode = String.fromCharCode(e.getCharCode());

        if(Ext.isGecko && (e.isNavKeyPress() || key === e.BACKSPACE || (key === e.DELETE && e.button === -1))){
            return;
        }

        if(!Ext.isGecko && e.isSpecialKey() && !charCode){
            return;
        }
        if(!this.maskRe.test(charCode)){
            e.stopEvent();
        }
    },

    getState: function() {
        return this.addPropertyToState(this.callParent(), 'value');
    },

    applyState: function(state) {
        this.callParent(arguments);
        if(state.hasOwnProperty('value')) {
            this.setValue(state.value);
        }
    },

    /**
     * Returns the raw String value of the field, without performing any normalization, conversion, or validation. Gets
     * the current value of the input element if the field has been rendered, ignoring the value if it is the
     * {@link #emptyText}. To get a normalized and converted value see {@link #getValue}.
     * @return {String} The raw String value of the field
     */
    getRawValue: function() {
        var me = this,
            v = me.callParent();
        if (v === me.emptyText) {
            v = '';
        }
        return v;
    },

    /**
     * Sets a data value into the field and runs the change detection and validation. Also applies any configured
     * {@link #emptyText} for text fields. To set the value directly without these inspections see {@link #setRawValue}.
     * @param {Object} value The value to set
     * @return {Ext.form.field.Text} this
     */
    setValue: function(value) {
        var me = this,
            inputEl = me.inputEl;

        if (inputEl && me.emptyText && !Ext.isEmpty(value)) {
            inputEl.removeCls(me.emptyCls);
        }

        me.callParent(arguments);

        me.applyEmptyText();
        return me;
    },

    /**
     * Validates a value according to the field's validation rules and returns an array of errors
     * for any failing validations. Validation rules are processed in the following order:
     *
     * 1. **Field specific validator**
     *
     *     A validator offers a way to customize and reuse a validation specification.
     *     If a field is configured with a `{@link #validator}`
     *     function, it will be passed the current field value.  The `{@link #validator}`
     *     function is expected to return either:
     *
     *     - Boolean `true`  if the value is valid (validation continues).
     *     - a String to represent the invalid message if invalid (validation halts).
     *
     * 2. **Basic Validation**
     *
     *     If the `{@link #validator}` has not halted validation,
     *     basic validation proceeds as follows:
     *
     *     - `{@link #allowBlank}` : (Invalid message = `{@link #emptyText}`)
     *
     *         Depending on the configuration of `{@link #allowBlank}`, a
     *         blank field will cause validation to halt at this step and return
     *         Boolean true or false accordingly.
     *
     *     - `{@link #minLength}` : (Invalid message = `{@link #minLengthText}`)
     *
     *         If the passed value does not satisfy the `{@link #minLength}`
     *         specified, validation halts.
     *
     *     -  `{@link #maxLength}` : (Invalid message = `{@link #maxLengthText}`)
     *
     *         If the passed value does not satisfy the `{@link #maxLength}`
     *         specified, validation halts.
     *
     * 3. **Preconfigured Validation Types (VTypes)**
     *
     *     If none of the prior validation steps halts validation, a field
     *     configured with a `{@link #vtype}` will utilize the
     *     corresponding {@link Ext.form.field.VTypes VTypes} validation function.
     *     If invalid, either the field's `{@link #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**
     *
     *     If none of the prior validation steps halts validation, a field's
     *     configured `{@link #regex}` test will be processed.
     *     The invalid message for this test is configured with `{@link #regexText}`
     *
     * @param {Object} value The value to validate. The processed raw value will be used if nothing is passed.
     * @return {String[]} Array of any validation errors
     */
    getErrors: function(value) {
        var me = this,
            errors = me.callParent(arguments),
            validator = me.validator,
            emptyText = me.emptyText,
            allowBlank = me.allowBlank,
            vtype = me.vtype,
            vtypes = Ext.form.field.VTypes,
            regex = me.regex,
            format = Ext.String.format,
            msg;

        value = value || me.processRawValue(me.getRawValue());

        if (Ext.isFunction(validator)) {
            msg = validator.call(me, value);
            if (msg !== true) {
                errors.push(msg);
            }
        }

        if (value.length < 1 || value === emptyText) {
            if (!allowBlank) {
                errors.push(me.blankText);
            }
            //if value is blank, there cannot be any additional errors
            return errors;
        }

        if (value.length < me.minLength) {
            errors.push(format(me.minLengthText, me.minLength));
        }

        if (value.length > me.maxLength) {
            errors.push(format(me.maxLengthText, me.maxLength));
        }

        if (vtype) {
            if(!vtypes[vtype](value, me)){
                errors.push(me.vtypeText || vtypes[vtype +'Text']);
            }
        }

        if (regex && !regex.test(value)) {
            errors.push(me.regexText || me.invalidText);
        }

        return errors;
    },

    /**
     * Selects text in this field
     * @param {Number} [start=0] The index where the selection should start
     * @param {Number} [end] The index where the selection should end (defaults to the text length)
     */
    selectText : function(start, end){
        var me = this,
            v = me.getRawValue(),
            doFocus = true,
            el = me.inputEl.dom,
            undef,
            range;

        if (v.length > 0) {
            start = start === undef ? 0 : start;
            end = end === undef ? v.length : end;
            if (el.setSelectionRange) {
                el.setSelectionRange(start, end);
            }
            else if(el.createTextRange) {
                range = el.createTextRange();
                range.moveStart('character', start);
                range.moveEnd('character', end - v.length);
                range.select();
            }
            doFocus = Ext.isGecko || Ext.isOpera;
        }
        if (doFocus) {
            me.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 if the width changes.
     */
    autoSize: function() {
        var me = this;
        if (me.grow && me.rendered) {
            me.autoSizing = true;
            me.updateLayout();
        }
    },

    afterComponentLayout: function() {
        var me = this,
            width;

        me.callParent(arguments);
        if (me.autoSizing) {
            width = me.inputEl.getWidth();
            if (width !== me.lastInputWidth) {
                me.fireEvent('autosize', me, width);
                me.lastInputWidth = width;
                delete me.autoSizing;
            }
        }
    }
});
