/*

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.

*/
/**
 * @docauthor Jason Johnston <jason@sencha.com>
 *
 * Provides a date input field with a {@link Ext.picker.Date date picker} dropdown and automatic date
 * validation.
 *
 * This field recognizes and uses the JavaScript Date object as its main {@link #value} type. In addition,
 * it recognizes string values which are parsed according to the {@link #format} and/or {@link #altFormats}
 * configs. These may be reconfigured to use date formats appropriate for the user's locale.
 *
 * The field may be limited to a certain range of dates by using the {@link #minValue}, {@link #maxValue},
 * {@link #disabledDays}, and {@link #disabledDates} config parameters. These configurations will be used both
 * in the field's validation, and in the date picker dropdown by preventing invalid dates from being selected.
 *
 * # Example usage
 *
 *     @example
 *     Ext.create('Ext.form.Panel', {
 *         renderTo: Ext.getBody(),
 *         width: 300,
 *         bodyPadding: 10,
 *         title: 'Dates',
 *         items: [{
 *             xtype: 'datefield',
 *             anchor: '100%',
 *             fieldLabel: 'From',
 *             name: 'from_date',
 *             maxValue: new Date()  // limited to the current date or prior
 *         }, {
 *             xtype: 'datefield',
 *             anchor: '100%',
 *             fieldLabel: 'To',
 *             name: 'to_date',
 *             value: new Date()  // defaults to today
 *         }]
 *     });
 *
 * # Date Formats Examples
 *
 * This example shows a couple of different date format parsing scenarios. Both use custom date format
 * configurations; the first one matches the configured `format` while the second matches the `altFormats`.
 *
 *     @example
 *     Ext.create('Ext.form.Panel', {
 *         renderTo: Ext.getBody(),
 *         width: 300,
 *         bodyPadding: 10,
 *         title: 'Dates',
 *         items: [{
 *             xtype: 'datefield',
 *             anchor: '100%',
 *             fieldLabel: 'Date',
 *             name: 'date',
 *             // The value matches the format; will be parsed and displayed using that format.
 *             format: 'm d Y',
 *             value: '2 4 1978'
 *         }, {
 *             xtype: 'datefield',
 *             anchor: '100%',
 *             fieldLabel: 'Date',
 *             name: 'date',
 *             // The value does not match the format, but does match an altFormat; will be parsed
 *             // using the altFormat and displayed using the format.
 *             format: 'm d Y',
 *             altFormats: 'm,d,Y|m.d.Y',
 *             value: '2.4.1978'
 *         }]
 *     });
 */
Ext.define('Ext.form.field.Date', {
    extend:'Ext.form.field.Picker',
    alias: 'widget.datefield',
    requires: ['Ext.picker.Date'],
    alternateClassName: ['Ext.form.DateField', 'Ext.form.Date'],

    /**
     * @cfg {String} format
     * The default date format string which can be overriden for localization support. The format must be valid
     * according to {@link Ext.Date#parse}.
     */
    format : "m/d/Y",
    /**
     * @cfg {String} altFormats
     * Multiple date formats separated by "|" to try when parsing a user input value and it does not match the defined
     * format.
     */
    altFormats : "m/d/Y|n/j/Y|n/j/y|m/j/y|n/d/y|m/j/Y|n/d/Y|m-d-y|m-d-Y|m/d|m-d|md|mdy|mdY|d|Y-m-d|n-j|n/j",
    /**
     * @cfg {String} disabledDaysText
     * The tooltip to display when the date falls on a disabled day.
     */
    disabledDaysText : "Disabled",
    /**
     * @cfg {String} disabledDatesText
     * The tooltip text to display when the date falls on a disabled date.
     */
    disabledDatesText : "Disabled",
    /**
     * @cfg {String} minText
     * The error text to display when the date in the cell is before {@link #minValue}.
     */
    minText : "The date in this field must be equal to or after {0}",
    /**
     * @cfg {String} maxText
     * The error text to display when the date in the cell is after {@link #maxValue}.
     */
    maxText : "The date in this field must be equal to or before {0}",
    /**
     * @cfg {String} invalidText
     * The error text to display when the date in the field is invalid.
     */
    invalidText : "{0} is not a valid date - it must be in the format {1}",
    /**
     * @cfg {String} [triggerCls='x-form-date-trigger']
     * An additional CSS class used to style the trigger button. The trigger will always get the class 'x-form-trigger'
     * and triggerCls will be **appended** if specified (default class displays a calendar icon).
     */
    triggerCls : Ext.baseCSSPrefix + 'form-date-trigger',
    /**
     * @cfg {Boolean} showToday
     * false to hide the footer area of the Date picker containing the Today button and disable the keyboard handler for
     * spacebar that selects the current date.
     */
    showToday : true,
    /**
     * @cfg {Date/String} minValue
     * The minimum allowed date. Can be either a Javascript date object or a string date in a valid format.
     */
    /**
     * @cfg {Date/String} maxValue
     * The maximum allowed date. Can be either a Javascript date object or a string date in a valid format.
     */
    /**
     * @cfg {Number[]} disabledDays
     * An array of days to disable, 0 based. Some examples:
     *
     *     // disable Sunday and Saturday:
     *     disabledDays:  [0, 6]
     *     // disable weekdays:
     *     disabledDays: [1,2,3,4,5]
     */
    /**
     * @cfg {String[]} disabledDates
     * An array of "dates" to disable, as strings. These strings will be used to build a dynamic regular expression so
     * they are very powerful. Some examples:
     *
     *     // disable these exact dates:
     *     disabledDates: ["03/08/2003", "09/16/2003"]
     *     // disable these days for every year:
     *     disabledDates: ["03/08", "09/16"]
     *     // only match the beginning (useful if you are using short years):
     *     disabledDates: ["^03/08"]
     *     // disable every day in March 2006:
     *     disabledDates: ["03/../2006"]
     *     // disable every day in every March:
     *     disabledDates: ["^03"]
     *
     * Note that the format of the dates included in the array should exactly match the {@link #format} config. In order
     * to support regular expressions, if you are using a {@link #format date format} that has "." in it, you will have
     * to escape the dot when restricting dates. For example: `["03\\.08\\.03"]`.
     */

    /**
     * @cfg {String} submitFormat
     * The date format string which will be submitted to the server. The format must be valid according to {@link
     * Ext.Date#parse} (defaults to {@link #format}).
     */

    // in the absence of a time value, a default value of 12 noon will be used
    // (note: 12 noon was chosen because it steers well clear of all DST timezone changes)
    initTime: '12', // 24 hour format

    initTimeFormat: 'H',

    matchFieldWidth: false,
    /**
     * @cfg {Number} startDay
     * Day index at which the week should begin, 0-based (defaults to Sunday)
     */
    startDay: 0,

    initComponent : function(){
        var me = this,
            isString = Ext.isString,
            min, max;

        min = me.minValue;
        max = me.maxValue;
        if(isString(min)){
            me.minValue = me.parseDate(min);
        }
        if(isString(max)){
            me.maxValue = me.parseDate(max);
        }
        me.disabledDatesRE = null;
        me.initDisabledDays();

        me.callParent();
    },

    initValue: function() {
        var me = this,
            value = me.value;

        // If a String value was supplied, try to convert it to a proper Date
        if (Ext.isString(value)) {
            me.value = me.rawToValue(value);
        }

        me.callParent();
    },

    // private
    initDisabledDays : function(){
        if(this.disabledDates){
            var dd = this.disabledDates,
                len = dd.length - 1,
                re = "(?:";

            Ext.each(dd, function(d, i){
                re += Ext.isDate(d) ? '^' + Ext.String.escapeRegex(d.dateFormat(this.format)) + '$' : dd[i];
                if (i !== len) {
                    re += '|';
                }
            }, this);
            this.disabledDatesRE = new RegExp(re + ')');
        }
    },

    /**
     * Replaces any existing disabled dates with new values and refreshes the Date picker.
     * @param {String[]} disabledDates An array of date strings (see the {@link #disabledDates} config for details on
     * supported values) used to disable a pattern of dates.
     */
    setDisabledDates : function(dd){
        var me = this,
            picker = me.picker;

        me.disabledDates = dd;
        me.initDisabledDays();
        if (picker) {
            picker.setDisabledDates(me.disabledDatesRE);
        }
    },

    /**
     * Replaces any existing disabled days (by index, 0-6) with new values and refreshes the Date picker.
     * @param {Number[]} disabledDays An array of disabled day indexes. See the {@link #disabledDays} config for details on
     * supported values.
     */
    setDisabledDays : function(dd){
        var picker = this.picker;

        this.disabledDays = dd;
        if (picker) {
            picker.setDisabledDays(dd);
        }
    },

    /**
     * Replaces any existing {@link #minValue} with the new value and refreshes the Date picker.
     * @param {Date} value The minimum date that can be selected
     */
    setMinValue : function(dt){
        var me = this,
            picker = me.picker,
            minValue = (Ext.isString(dt) ? me.parseDate(dt) : dt);

        me.minValue = minValue;
        if (picker) {
            picker.minText = Ext.String.format(me.minText, me.formatDate(me.minValue));
            picker.setMinDate(minValue);
        }
    },

    /**
     * Replaces any existing {@link #maxValue} with the new value and refreshes the Date picker.
     * @param {Date} value The maximum date that can be selected
     */
    setMaxValue : function(dt){
        var me = this,
            picker = me.picker,
            maxValue = (Ext.isString(dt) ? me.parseDate(dt) : dt);

        me.maxValue = maxValue;
        if (picker) {
            picker.maxText = Ext.String.format(me.maxText, me.formatDate(me.maxValue));
            picker.setMaxDate(maxValue);
        }
    },

    /**
     * Runs all of Date's validations and returns an array of any errors. Note that this first runs Text's validations,
     * so the returned array is an amalgamation of all field errors. The additional validation checks are testing that
     * the date format is valid, that the chosen date is within the min and max date constraints set, that the date
     * chosen is not in the disabledDates regex and that the day chosed is not one of the disabledDays.
     * @param {Object} [value] The value to get errors for (defaults to the current field value)
     * @return {String[]} All validation errors for this field
     */
    getErrors: function(value) {
        var me = this,
            format = Ext.String.format,
            clearTime = Ext.Date.clearTime,
            errors = me.callParent(arguments),
            disabledDays = me.disabledDays,
            disabledDatesRE = me.disabledDatesRE,
            minValue = me.minValue,
            maxValue = me.maxValue,
            len = disabledDays ? disabledDays.length : 0,
            i = 0,
            svalue,
            fvalue,
            day,
            time;

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

        if (value === null || value.length < 1) { // if it's blank and textfield didn't flag it then it's valid
             return errors;
        }

        svalue = value;
        value = me.parseDate(value);
        if (!value) {
            errors.push(format(me.invalidText, svalue, me.format));
            return errors;
        }

        time = value.getTime();
        if (minValue && time < clearTime(minValue).getTime()) {
            errors.push(format(me.minText, me.formatDate(minValue)));
        }

        if (maxValue && time > clearTime(maxValue).getTime()) {
            errors.push(format(me.maxText, me.formatDate(maxValue)));
        }

        if (disabledDays) {
            day = value.getDay();

            for(; i < len; i++) {
                if (day === disabledDays[i]) {
                    errors.push(me.disabledDaysText);
                    break;
                }
            }
        }

        fvalue = me.formatDate(value);
        if (disabledDatesRE && disabledDatesRE.test(fvalue)) {
            errors.push(format(me.disabledDatesText, fvalue));
        }

        return errors;
    },

    rawToValue: function(rawValue) {
        return this.parseDate(rawValue) || rawValue || null;
    },

    valueToRaw: function(value) {
        return this.formatDate(this.parseDate(value));
    },

    /**
     * @method setValue
     * Sets the value of the date field. You can pass a date object or any string that can be parsed into a valid date,
     * using {@link #format} as the date format, according to the same rules as {@link Ext.Date#parse} (the default
     * format used is "m/d/Y").
     *
     * Usage:
     *
     *     //All of these calls set the same date value (May 4, 2006)
     *
     *     //Pass a date object:
     *     var dt = new Date('5/4/2006');
     *     dateField.setValue(dt);
     *
     *     //Pass a date string (default format):
     *     dateField.setValue('05/04/2006');
     *
     *     //Pass a date string (custom format):
     *     dateField.format = 'Y-m-d';
     *     dateField.setValue('2006-05-04');
     *
     * @param {String/Date} date The date or valid date string
     * @return {Ext.form.field.Date} this
     */

    /**
     * Attempts to parse a given string value using a given {@link Ext.Date#parse date format}.
     * @param {String} value The value to attempt to parse
     * @param {String} format A valid date format (see {@link Ext.Date#parse})
     * @return {Date} The parsed Date object, or null if the value could not be successfully parsed.
     */
    safeParse : function(value, format) {
        var me = this,
            utilDate = Ext.Date,
            parsedDate,
            result = null;

        if (utilDate.formatContainsHourInfo(format)) {
            // if parse format contains hour information, no DST adjustment is necessary
            result = utilDate.parse(value, format);
        } else {
            // set time to 12 noon, then clear the time
            parsedDate = utilDate.parse(value + ' ' + me.initTime, format + ' ' + me.initTimeFormat);
            if (parsedDate) {
                result = utilDate.clearTime(parsedDate);
            }
        }
        return result;
    },

    // @private
    getSubmitValue: function() {
        var format = this.submitFormat || this.format,
            value = this.getValue();

        return value ? Ext.Date.format(value, format) : '';
    },

    /**
     * @private
     */
    parseDate : function(value) {
        if(!value || Ext.isDate(value)){
            return value;
        }

        var me = this,
            val = me.safeParse(value, me.format),
            altFormats = me.altFormats,
            altFormatsArray = me.altFormatsArray,
            i = 0,
            len;

        if (!val && altFormats) {
            altFormatsArray = altFormatsArray || altFormats.split('|');
            len = altFormatsArray.length;
            for (; i < len && !val; ++i) {
                val = me.safeParse(value, altFormatsArray[i]);
            }
        }
        return val;
    },

    // private
    formatDate : function(date){
        return Ext.isDate(date) ? Ext.Date.dateFormat(date, this.format) : date;
    },

    createPicker: function() {
        var me = this,
            format = Ext.String.format;

        return Ext.create('Ext.picker.Date', {
            pickerField: me,
            ownerCt: me.ownerCt,
            renderTo: document.body,
            floating: true,
            hidden: true,
            focusOnShow: true,
            minDate: me.minValue,
            maxDate: me.maxValue,
            disabledDatesRE: me.disabledDatesRE,
            disabledDatesText: me.disabledDatesText,
            disabledDays: me.disabledDays,
            disabledDaysText: me.disabledDaysText,
            format: me.format,
            showToday: me.showToday,
            startDay: me.startDay,
            minText: format(me.minText, me.formatDate(me.minValue)),
            maxText: format(me.maxText, me.formatDate(me.maxValue)),
            listeners: {
                scope: me,
                select: me.onSelect
            },
            keyNavConfig: {
                esc: function() {
                    me.collapse();
                }
            }
        });
    },

    onSelect: function(m, d) {
        var me = this;

        me.setValue(d);
        me.fireEvent('select', me, d);
        me.collapse();
    },

    /**
     * @private
     * Sets the Date picker's value to match the current field value when expanding.
     */
    onExpand: function() {
        var value = this.getValue();
        this.picker.setValue(Ext.isDate(value) ? value : new Date());
    },

    /**
     * @private
     * Focuses the field when collapsing the Date picker.
     */
    onCollapse: function() {
        this.focus(false, 60);
    },

    // private
    beforeBlur : function(){
        var me = this,
            v = me.parseDate(me.getRawValue()),
            focusTask = me.focusTask;

        if (focusTask) {
            focusTask.cancel();
        }

        if (v) {
            me.setValue(v);
        }
    }

    /**
     * @hide
     * @cfg {Boolean} grow
     */
    /**
     * @hide
     * @cfg {Number} growMin
     */
    /**
     * @hide
     * @cfg {Number} growMax
     */
    /**
     * @hide
     * @method autoSize
     */
});

