/*!

 * Date picker for pickadate.js v3.5.6

 * http://amsul.github.io/pickadate.js/date.htm

 */



(function ( factory ) {



    // AMD.

    if ( typeof define == 'function' && define.amd )

        define( ['picker', 'jquery'], factory )



    // Node.js/browserify.

    else if ( typeof exports == 'object' )

        module.exports = factory( require('./picker.js'), require('jquery') )



    // Browser globals.

    else factory( Picker, jQuery )



}(function( Picker, $ ) {





/**

 * Globals and constants

 */

var DAYS_IN_WEEK = 7,

    WEEKS_IN_CALENDAR = 6,

    _ = Picker._







/**

 * The date picker constructor

 */

function DatePicker( picker, settings ) {



    var calendar = this,

        element = picker.$node[ 0 ],

        elementValue = element.value,

        elementDataValue = picker.$node.data( 'value' ),

        valueString = elementDataValue || elementValue,

        formatString = elementDataValue ? settings.formatSubmit : settings.format,

        isRTL = function() {



            return element.currentStyle ?



                // For IE.

                element.currentStyle.direction == 'rtl' :



                // For normal browsers.

                getComputedStyle( picker.$root[0] ).direction == 'rtl'

        }



    calendar.settings = settings

    calendar.$node = picker.$node



    // The queue of methods that will be used to build item objects.

    calendar.queue = {

        min: 'measure create',

        max: 'measure create',

        now: 'now create',

        select: 'parse create validate',

        highlight: 'parse navigate create validate',

        view: 'parse create validate viewset',

        disable: 'deactivate',

        enable: 'activate'

    }



    // The component's item object.

    calendar.item = {}



    calendar.item.clear = null

    calendar.item.disable = ( settings.disable || [] ).slice( 0 )

    calendar.item.enable = -(function( collectionDisabled ) {

        return collectionDisabled[ 0 ] === true ? collectionDisabled.shift() : -1

    })( calendar.item.disable )



    calendar.

        set( 'min', settings.min ).

        set( 'max', settings.max ).

        set( 'now' )



    // When there’s a value, set the `select`, which in turn

    // also sets the `highlight` and `view`.

    if ( valueString ) {

        calendar.set( 'select', valueString, {

            format: formatString,

            defaultValue: true

        })

    }



    // If there’s no value, default to highlighting “today”.

    else {

        calendar.

            set( 'select', null ).

            set( 'highlight', calendar.item.now )

    }





    // The keycode to movement mapping.

    calendar.key = {

        40: 7, // Down

        38: -7, // Up

        39: function() { return isRTL() ? -1 : 1 }, // Right

        37: function() { return isRTL() ? 1 : -1 }, // Left

        go: function( timeChange ) {

            var highlightedObject = calendar.item.highlight,

                targetDate = new Date( highlightedObject.year, highlightedObject.month, highlightedObject.date + timeChange )

            calendar.set(

                'highlight',

                targetDate,

                { interval: timeChange }

            )

            this.render()

        }

    }





    // Bind some picker events.

    picker.

        on( 'render', function() {

            picker.$root.find( '.' + settings.klass.selectMonth ).on( 'change', function() {

                var value = this.value

                if ( value ) {

                    picker.set( 'highlight', [ picker.get( 'view' ).year, value, picker.get( 'highlight' ).date ] )

                    picker.$root.find( '.' + settings.klass.selectMonth ).trigger( 'focus' )

                }

            })

            picker.$root.find( '.' + settings.klass.selectYear ).on( 'change', function() {

                var value = this.value

                if ( value ) {

                    picker.set( 'highlight', [ value, picker.get( 'view' ).month, picker.get( 'highlight' ).date ] )

                    picker.$root.find( '.' + settings.klass.selectYear ).trigger( 'focus' )

                }

            })

        }, 1 ).

        on( 'open', function() {

            var includeToday = ''

            if ( calendar.disabled( calendar.get('now') ) ) {

                includeToday = ':not(.' + settings.klass.buttonToday + ')'

            }

            picker.$root.find( 'button' + includeToday + ', select' ).attr( 'disabled', false )

        }, 1 ).

        on( 'close', function() {

            picker.$root.find( 'button, select' ).attr( 'disabled', true )

        }, 1 )



} //DatePicker





/**

 * Set a datepicker item object.

 */

DatePicker.prototype.set = function( type, value, options ) {



    var calendar = this,

        calendarItem = calendar.item



    // If the value is `null` just set it immediately.

    if ( value === null ) {

        if ( type == 'clear' ) type = 'select'

        calendarItem[ type ] = value

        return calendar

    }



    // Otherwise go through the queue of methods, and invoke the functions.

    // Update this as the time unit, and set the final value as this item.

    // * In the case of `enable`, keep the queue but set `disable` instead.

    //   And in the case of `flip`, keep the queue but set `enable` instead.

    calendarItem[ ( type == 'enable' ? 'disable' : type == 'flip' ? 'enable' : type ) ] = calendar.queue[ type ].split( ' ' ).map( function( method ) {

        value = calendar[ method ]( type, value, options )

        return value

    }).pop()



    // Check if we need to cascade through more updates.

    if ( type == 'select' ) {

        calendar.set( 'highlight', calendarItem.select, options )

    }

    else if ( type == 'highlight' ) {

        calendar.set( 'view', calendarItem.highlight, options )

    }

    else if ( type.match( /^(flip|min|max|disable|enable)$/ ) ) {

        if ( calendarItem.select && calendar.disabled( calendarItem.select ) ) {

            calendar.set( 'select', calendarItem.select, options )

        }

        if ( calendarItem.highlight && calendar.disabled( calendarItem.highlight ) ) {

            calendar.set( 'highlight', calendarItem.highlight, options )

        }

    }



    return calendar

} //DatePicker.prototype.set





/**

 * Get a datepicker item object.

 */

DatePicker.prototype.get = function( type ) {

    return this.item[ type ]

} //DatePicker.prototype.get





/**

 * Create a picker date object.

 */

DatePicker.prototype.create = function( type, value, options ) {



    var isInfiniteValue,

        calendar = this



    // If there’s no value, use the type as the value.

    value = value === undefined ? type : value





    // If it’s infinity, update the value.

    if ( value == -Infinity || value == Infinity ) {

        isInfiniteValue = value

    }



    // If it’s an object, use the native date object.

    else if ( $.isPlainObject( value ) && _.isInteger( value.pick ) ) {

        value = value.obj

    }



    // If it’s an array, convert it into a date and make sure

    // that it’s a valid date – otherwise default to today.

    else if ( $.isArray( value ) ) {

        value = new Date( value[ 0 ], value[ 1 ], value[ 2 ] )

        value = _.isDate( value ) ? value : calendar.create().obj

    }



    // If it’s a number or date object, make a normalized date.

    else if ( _.isInteger( value ) || _.isDate( value ) ) {

        value = calendar.normalize( new Date( value ), options )

    }



    // If it’s a literal true or any other case, set it to now.

    else /*if ( value === true )*/ {

        value = calendar.now( type, value, options )

    }



    // Return the compiled object.

    return {

        year: isInfiniteValue || value.getFullYear(),

        month: isInfiniteValue || value.getMonth(),

        date: isInfiniteValue || value.getDate(),

        day: isInfiniteValue || value.getDay(),

        obj: isInfiniteValue || value,

        pick: isInfiniteValue || value.getTime()

    }

} //DatePicker.prototype.create





/**

 * Create a range limit object using an array, date object,

 * literal “true”, or integer relative to another time.

 */

DatePicker.prototype.createRange = function( from, to ) {



    var calendar = this,

        createDate = function( date ) {

            if ( date === true || $.isArray( date ) || _.isDate( date ) ) {

                return calendar.create( date )

            }

            return date

        }



    // Create objects if possible.

    if ( !_.isInteger( from ) ) {

        from = createDate( from )

    }

    if ( !_.isInteger( to ) ) {

        to = createDate( to )

    }



    // Create relative dates.

    if ( _.isInteger( from ) && $.isPlainObject( to ) ) {

        from = [ to.year, to.month, to.date + from ];

    }

    else if ( _.isInteger( to ) && $.isPlainObject( from ) ) {

        to = [ from.year, from.month, from.date + to ];

    }



    return {

        from: createDate( from ),

        to: createDate( to )

    }

} //DatePicker.prototype.createRange





/**

 * Check if a date unit falls within a date range object.

 */

DatePicker.prototype.withinRange = function( range, dateUnit ) {

    range = this.createRange(range.from, range.to)

    return dateUnit.pick >= range.from.pick && dateUnit.pick <= range.to.pick

}





/**

 * Check if two date range objects overlap.

 */

DatePicker.prototype.overlapRanges = function( one, two ) {



    var calendar = this



    // Convert the ranges into comparable dates.

    one = calendar.createRange( one.from, one.to )

    two = calendar.createRange( two.from, two.to )



    return calendar.withinRange( one, two.from ) || calendar.withinRange( one, two.to ) ||

        calendar.withinRange( two, one.from ) || calendar.withinRange( two, one.to )

}





/**

 * Get the date today.

 */

DatePicker.prototype.now = function( type, value, options ) {

    value = new Date()

    if ( options && options.rel ) {

        value.setDate( value.getDate() + options.rel )

    }

    return this.normalize( value, options )

}





/**

 * Navigate to next/prev month.

 */

DatePicker.prototype.navigate = function( type, value, options ) {



    var targetDateObject,

        targetYear,

        targetMonth,

        targetDate,

        isTargetArray = $.isArray( value ),

        isTargetObject = $.isPlainObject( value ),

        viewsetObject = this.item.view/*,

        safety = 100*/





    if ( isTargetArray || isTargetObject ) {



        if ( isTargetObject ) {

            targetYear = value.year

            targetMonth = value.month

            targetDate = value.date

        }

        else {

            targetYear = +value[0]

            targetMonth = +value[1]

            targetDate = +value[2]

        }



        // If we’re navigating months but the view is in a different

        // month, navigate to the view’s year and month.

        if ( options && options.nav && viewsetObject && viewsetObject.month !== targetMonth ) {

            targetYear = viewsetObject.year

            targetMonth = viewsetObject.month

        }



        // Figure out the expected target year and month.

        targetDateObject = new Date( targetYear, targetMonth + ( options && options.nav ? options.nav : 0 ), 1 )

        targetYear = targetDateObject.getFullYear()

        targetMonth = targetDateObject.getMonth()



        // If the month we’re going to doesn’t have enough days,

        // keep decreasing the date until we reach the month’s last date.

        while ( /*safety &&*/ new Date( targetYear, targetMonth, targetDate ).getMonth() !== targetMonth ) {

            targetDate -= 1

            /*safety -= 1

            if ( !safety ) {

                throw 'Fell into an infinite loop while navigating to ' + new Date( targetYear, targetMonth, targetDate ) + '.'

            }*/

        }



        value = [ targetYear, targetMonth, targetDate ]

    }



    return value

} //DatePicker.prototype.navigate





/**

 * Normalize a date by setting the hours to midnight.

 */

DatePicker.prototype.normalize = function( value/*, options*/ ) {

    value.setHours( 0, 0, 0, 0 )

    return value

}





/**

 * Measure the range of dates.

 */

DatePicker.prototype.measure = function( type, value/*, options*/ ) {



    var calendar = this



    // If it’s anything false-y, remove the limits.

    if ( !value ) {

        value = type == 'min' ? -Infinity : Infinity

    }



    // If it’s a string, parse it.

    else if ( typeof value == 'string' ) {

        value = calendar.parse( type, value )

    }



    // If it's an integer, get a date relative to today.

    else if ( _.isInteger( value ) ) {

        value = calendar.now( type, value, { rel: value } )

    }



    return value

} ///DatePicker.prototype.measure





/**

 * Create a viewset object based on navigation.

 */

DatePicker.prototype.viewset = function( type, dateObject/*, options*/ ) {

    return this.create([ dateObject.year, dateObject.month, 1 ])

}





/**

 * Validate a date as enabled and shift if needed.

 */

DatePicker.prototype.validate = function( type, dateObject, options ) {



    var calendar = this,



        // Keep a reference to the original date.

        originalDateObject = dateObject,



        // Make sure we have an interval.

        interval = options && options.interval ? options.interval : 1,



        // Check if the calendar enabled dates are inverted.

        isFlippedBase = calendar.item.enable === -1,



        // Check if we have any enabled dates after/before now.

        hasEnabledBeforeTarget, hasEnabledAfterTarget,



        // The min & max limits.

        minLimitObject = calendar.item.min,

        maxLimitObject = calendar.item.max,



        // Check if we’ve reached the limit during shifting.

        reachedMin, reachedMax,



        // Check if the calendar is inverted and at least one weekday is enabled.

        hasEnabledWeekdays = isFlippedBase && calendar.item.disable.filter( function( value ) {



            // If there’s a date, check where it is relative to the target.

            if ( $.isArray( value ) ) {

                var dateTime = calendar.create( value ).pick

                if ( dateTime < dateObject.pick ) hasEnabledBeforeTarget = true

                else if ( dateTime > dateObject.pick ) hasEnabledAfterTarget = true

            }



            // Return only integers for enabled weekdays.

            return _.isInteger( value )

        }).length/*,



        safety = 100*/







    // Cases to validate for:

    // [1] Not inverted and date disabled.

    // [2] Inverted and some dates enabled.

    // [3] Not inverted and out of range.

    //

    // Cases to **not** validate for:

    // • Navigating months.

    // • Not inverted and date enabled.

    // • Inverted and all dates disabled.

    // • ..and anything else.

    if ( !options || (!options.nav && !options.defaultValue) ) if (

        /* 1 */ ( !isFlippedBase && calendar.disabled( dateObject ) ) ||

        /* 2 */ ( isFlippedBase && calendar.disabled( dateObject ) && ( hasEnabledWeekdays || hasEnabledBeforeTarget || hasEnabledAfterTarget ) ) ||

        /* 3 */ ( !isFlippedBase && (dateObject.pick <= minLimitObject.pick || dateObject.pick >= maxLimitObject.pick) )

    ) {





        // When inverted, flip the direction if there aren’t any enabled weekdays

        // and there are no enabled dates in the direction of the interval.

        if ( isFlippedBase && !hasEnabledWeekdays && ( ( !hasEnabledAfterTarget && interval > 0 ) || ( !hasEnabledBeforeTarget && interval < 0 ) ) ) {

            interval *= -1

        }





        // Keep looping until we reach an enabled date.

        while ( /*safety &&*/ calendar.disabled( dateObject ) ) {



            /*safety -= 1

            if ( !safety ) {

                throw 'Fell into an infinite loop while validating ' + dateObject.obj + '.'

            }*/





            // If we’ve looped into the next/prev month with a large interval, return to the original date and flatten the interval.

            if ( Math.abs( interval ) > 1 && ( dateObject.month < originalDateObject.month || dateObject.month > originalDateObject.month ) ) {

                dateObject = originalDateObject

                interval = interval > 0 ? 1 : -1

            }





            // If we’ve reached the min/max limit, reverse the direction, flatten the interval and set it to the limit.

            if ( dateObject.pick <= minLimitObject.pick ) {

                reachedMin = true

                interval = 1

                dateObject = calendar.create([

                    minLimitObject.year,

                    minLimitObject.month,

                    minLimitObject.date + (dateObject.pick === minLimitObject.pick ? 0 : -1)

                ])

            }

            else if ( dateObject.pick >= maxLimitObject.pick ) {

                reachedMax = true

                interval = -1

                dateObject = calendar.create([

                    maxLimitObject.year,

                    maxLimitObject.month,

                    maxLimitObject.date + (dateObject.pick === maxLimitObject.pick ? 0 : 1)

                ])

            }





            // If we’ve reached both limits, just break out of the loop.

            if ( reachedMin && reachedMax ) {

                break

            }





            // Finally, create the shifted date using the interval and keep looping.

            dateObject = calendar.create([ dateObject.year, dateObject.month, dateObject.date + interval ])

        }



    } //endif





    // Return the date object settled on.

    return dateObject

} //DatePicker.prototype.validate





/**

 * Check if a date is disabled.

 */

DatePicker.prototype.disabled = function( dateToVerify ) {



    var

        calendar = this,



        // Filter through the disabled dates to check if this is one.

        isDisabledMatch = calendar.item.disable.filter( function( dateToDisable ) {



            // If the date is a number, match the weekday with 0index and `firstDay` check.

            if ( _.isInteger( dateToDisable ) ) {

                return dateToVerify.day === ( calendar.settings.firstDay ? dateToDisable : dateToDisable - 1 ) % 7

            }



            // If it’s an array or a native JS date, create and match the exact date.

            if ( $.isArray( dateToDisable ) || _.isDate( dateToDisable ) ) {

                return dateToVerify.pick === calendar.create( dateToDisable ).pick

            }



            // If it’s an object, match a date within the “from” and “to” range.

            if ( $.isPlainObject( dateToDisable ) ) {

                return calendar.withinRange( dateToDisable, dateToVerify )

            }

        })



    // If this date matches a disabled date, confirm it’s not inverted.

    isDisabledMatch = isDisabledMatch.length && !isDisabledMatch.filter(function( dateToDisable ) {

        return $.isArray( dateToDisable ) && dateToDisable[3] == 'inverted' ||

            $.isPlainObject( dateToDisable ) && dateToDisable.inverted

    }).length



    // Check the calendar “enabled” flag and respectively flip the

    // disabled state. Then also check if it’s beyond the min/max limits.

    return calendar.item.enable === -1 ? !isDisabledMatch : isDisabledMatch ||

        dateToVerify.pick < calendar.item.min.pick ||

        dateToVerify.pick > calendar.item.max.pick



} //DatePicker.prototype.disabled





/**

 * Parse a string into a usable type.

 */

DatePicker.prototype.parse = function( type, value, options ) {



    var calendar = this,

        parsingObject = {}



    // If it’s already parsed, we’re good.

    if ( !value || typeof value != 'string' ) {

        return value

    }



    // We need a `.format` to parse the value with.

    if ( !( options && options.format ) ) {

        options = options || {}

        options.format = calendar.settings.format

    }



    // Convert the format into an array and then map through it.

    calendar.formats.toArray( options.format ).map( function( label ) {



        var

            // Grab the formatting label.

            formattingLabel = calendar.formats[ label ],



            // The format length is from the formatting label function or the

            // label length without the escaping exclamation (!) mark.

            formatLength = formattingLabel ? _.trigger( formattingLabel, calendar, [ value, parsingObject ] ) : label.replace( /^!/, '' ).length



        // If there's a format label, split the value up to the format length.

        // Then add it to the parsing object with appropriate label.

        if ( formattingLabel ) {

            parsingObject[ label ] = value.substr( 0, formatLength )

        }



        // Update the value as the substring from format length to end.

        value = value.substr( formatLength )

    })



    // Compensate for month 0index.

    return [

        parsingObject.yyyy || parsingObject.yy,

        +( parsingObject.mm || parsingObject.m ) - 1,

        parsingObject.dd || parsingObject.d

    ]

} //DatePicker.prototype.parse





/**

 * Various formats to display the object in.

 */

DatePicker.prototype.formats = (function() {



    // Return the length of the first word in a collection.

    function getWordLengthFromCollection( string, collection, dateObject ) {



        // Grab the first word from the string.

        // Regex pattern from http://stackoverflow.com/q/150033

        var word = string.match( /[^\x00-\x7F]+|\w+/ )[ 0 ]



        // If there's no month index, add it to the date object

        if ( !dateObject.mm && !dateObject.m ) {

            dateObject.m = collection.indexOf( word ) + 1

        }



        // Return the length of the word.

        return word.length

    }



    // Get the length of the first word in a string.

    function getFirstWordLength( string ) {

        return string.match( /\w+/ )[ 0 ].length

    }



    return {



        d: function( string, dateObject ) {



            // If there's string, then get the digits length.

            // Otherwise return the selected date.

            return string ? _.digits( string ) : dateObject.date

        },

        dd: function( string, dateObject ) {



            // If there's a string, then the length is always 2.

            // Otherwise return the selected date with a leading zero.

            return string ? 2 : _.lead( dateObject.date )

        },

        ddd: function( string, dateObject ) {



            // If there's a string, then get the length of the first word.

            // Otherwise return the short selected weekday.

            return string ? getFirstWordLength( string ) : this.settings.weekdaysShort[ dateObject.day ]

        },

        dddd: function( string, dateObject ) {



            // If there's a string, then get the length of the first word.

            // Otherwise return the full selected weekday.

            return string ? getFirstWordLength( string ) : this.settings.weekdaysFull[ dateObject.day ]

        },

        m: function( string, dateObject ) {



            // If there's a string, then get the length of the digits

            // Otherwise return the selected month with 0index compensation.

            return string ? _.digits( string ) : dateObject.month + 1

        },

        mm: function( string, dateObject ) {



            // If there's a string, then the length is always 2.

            // Otherwise return the selected month with 0index and leading zero.

            return string ? 2 : _.lead( dateObject.month + 1 )

        },

        mmm: function( string, dateObject ) {



            var collection = this.settings.monthsShort



            // If there's a string, get length of the relevant month from the short

            // months collection. Otherwise return the selected month from that collection.

            return string ? getWordLengthFromCollection( string, collection, dateObject ) : collection[ dateObject.month ]

        },

        mmmm: function( string, dateObject ) {



            var collection = this.settings.monthsFull



            // If there's a string, get length of the relevant month from the full

            // months collection. Otherwise return the selected month from that collection.

            return string ? getWordLengthFromCollection( string, collection, dateObject ) : collection[ dateObject.month ]

        },

        yy: function( string, dateObject ) {



            // If there's a string, then the length is always 2.

            // Otherwise return the selected year by slicing out the first 2 digits.

            return string ? 2 : ( '' + dateObject.year ).slice( 2 )

        },

        yyyy: function( string, dateObject ) {



            // If there's a string, then the length is always 4.

            // Otherwise return the selected year.

            return string ? 4 : dateObject.year

        },



        // Create an array by splitting the formatting string passed.

        toArray: function( formatString ) { return formatString.split( /(d{1,4}|m{1,4}|y{4}|yy|!.)/g ) },



        // Format an object into a string using the formatting options.

        toString: function ( formatString, itemObject ) {

            var calendar = this

            return calendar.formats.toArray( formatString ).map( function( label ) {

                return _.trigger( calendar.formats[ label ], calendar, [ 0, itemObject ] ) || label.replace( /^!/, '' )

            }).join( '' )

        }

    }

})() //DatePicker.prototype.formats









/**

 * Check if two date units are the exact.

 */

DatePicker.prototype.isDateExact = function( one, two ) {



    var calendar = this



    // When we’re working with weekdays, do a direct comparison.

    if (

        ( _.isInteger( one ) && _.isInteger( two ) ) ||

        ( typeof one == 'boolean' && typeof two == 'boolean' )

     ) {

        return one === two

    }



    // When we’re working with date representations, compare the “pick” value.

    if (

        ( _.isDate( one ) || $.isArray( one ) ) &&

        ( _.isDate( two ) || $.isArray( two ) )

    ) {

        return calendar.create( one ).pick === calendar.create( two ).pick

    }



    // When we’re working with range objects, compare the “from” and “to”.

    if ( $.isPlainObject( one ) && $.isPlainObject( two ) ) {

        return calendar.isDateExact( one.from, two.from ) && calendar.isDateExact( one.to, two.to )

    }



    return false

}





/**

 * Check if two date units overlap.

 */

DatePicker.prototype.isDateOverlap = function( one, two ) {



    var calendar = this,

        firstDay = calendar.settings.firstDay ? 1 : 0



    // When we’re working with a weekday index, compare the days.

    if ( _.isInteger( one ) && ( _.isDate( two ) || $.isArray( two ) ) ) {

        one = one % 7 + firstDay

        return one === calendar.create( two ).day + 1

    }

    if ( _.isInteger( two ) && ( _.isDate( one ) || $.isArray( one ) ) ) {

        two = two % 7 + firstDay

        return two === calendar.create( one ).day + 1

    }



    // When we’re working with range objects, check if the ranges overlap.

    if ( $.isPlainObject( one ) && $.isPlainObject( two ) ) {

        return calendar.overlapRanges( one, two )

    }



    return false

}





/**

 * Flip the “enabled” state.

 */

DatePicker.prototype.flipEnable = function(val) {

    var itemObject = this.item

    itemObject.enable = val || (itemObject.enable == -1 ? 1 : -1)

}





/**

 * Mark a collection of dates as “disabled”.

 */

DatePicker.prototype.deactivate = function( type, datesToDisable ) {



    var calendar = this,

        disabledItems = calendar.item.disable.slice(0)





    // If we’re flipping, that’s all we need to do.

    if ( datesToDisable == 'flip' ) {

        calendar.flipEnable()

    }



    else if ( datesToDisable === false ) {

        calendar.flipEnable(1)

        disabledItems = []

    }



    else if ( datesToDisable === true ) {

        calendar.flipEnable(-1)

        disabledItems = []

    }



    // Otherwise go through the dates to disable.

    else {



        datesToDisable.map(function( unitToDisable ) {



            var matchFound



            // When we have disabled items, check for matches.

            // If something is matched, immediately break out.

            for ( var index = 0; index < disabledItems.length; index += 1 ) {

                if ( calendar.isDateExact( unitToDisable, disabledItems[index] ) ) {

                    matchFound = true

                    break

                }

            }



            // If nothing was found, add the validated unit to the collection.

            if ( !matchFound ) {

                if (

                    _.isInteger( unitToDisable ) ||

                    _.isDate( unitToDisable ) ||

                    $.isArray( unitToDisable ) ||

                    ( $.isPlainObject( unitToDisable ) && unitToDisable.from && unitToDisable.to )

                ) {

                    disabledItems.push( unitToDisable )

                }

            }

        })

    }



    // Return the updated collection.

    return disabledItems

} //DatePicker.prototype.deactivate





/**

 * Mark a collection of dates as “enabled”.

 */

DatePicker.prototype.activate = function( type, datesToEnable ) {



    var calendar = this,

        disabledItems = calendar.item.disable,

        disabledItemsCount = disabledItems.length



    // If we’re flipping, that’s all we need to do.

    if ( datesToEnable == 'flip' ) {

        calendar.flipEnable()

    }



    else if ( datesToEnable === true ) {

        calendar.flipEnable(1)

        disabledItems = []

    }



    else if ( datesToEnable === false ) {

        calendar.flipEnable(-1)

        disabledItems = []

    }



    // Otherwise go through the disabled dates.

    else {



        datesToEnable.map(function( unitToEnable ) {



            var matchFound,

                disabledUnit,

                index,

                isExactRange



            // Go through the disabled items and try to find a match.

            for ( index = 0; index < disabledItemsCount; index += 1 ) {



                disabledUnit = disabledItems[index]



                // When an exact match is found, remove it from the collection.

                if ( calendar.isDateExact( disabledUnit, unitToEnable ) ) {

                    matchFound = disabledItems[index] = null

                    isExactRange = true

                    break

                }



                // When an overlapped match is found, add the “inverted” state to it.

                else if ( calendar.isDateOverlap( disabledUnit, unitToEnable ) ) {

                    if ( $.isPlainObject( unitToEnable ) ) {

                        unitToEnable.inverted = true

                        matchFound = unitToEnable

                    }

                    else if ( $.isArray( unitToEnable ) ) {

                        matchFound = unitToEnable

                        if ( !matchFound[3] ) matchFound.push( 'inverted' )

                    }

                    else if ( _.isDate( unitToEnable ) ) {

                        matchFound = [ unitToEnable.getFullYear(), unitToEnable.getMonth(), unitToEnable.getDate(), 'inverted' ]

                    }

                    break

                }

            }



            // If a match was found, remove a previous duplicate entry.

            if ( matchFound ) for ( index = 0; index < disabledItemsCount; index += 1 ) {

                if ( calendar.isDateExact( disabledItems[index], unitToEnable ) ) {

                    disabledItems[index] = null

                    break

                }

            }



            // In the event that we’re dealing with an exact range of dates,

            // make sure there are no “inverted” dates because of it.

            if ( isExactRange ) for ( index = 0; index < disabledItemsCount; index += 1 ) {

                if ( calendar.isDateOverlap( disabledItems[index], unitToEnable ) ) {

                    disabledItems[index] = null

                    break

                }

            }



            // If something is still matched, add it into the collection.

            if ( matchFound ) {

                disabledItems.push( matchFound )

            }

        })

    }



    // Return the updated collection.

    return disabledItems.filter(function( val ) { return val != null })

} //DatePicker.prototype.activate





/**

 * Create a string for the nodes in the picker.

 */

DatePicker.prototype.nodes = function( isOpen ) {



    var

        calendar = this,

        settings = calendar.settings,

        calendarItem = calendar.item,

        nowObject = calendarItem.now,

        selectedObject = calendarItem.select,

        highlightedObject = calendarItem.highlight,

        viewsetObject = calendarItem.view,

        disabledCollection = calendarItem.disable,

        minLimitObject = calendarItem.min,

        maxLimitObject = calendarItem.max,





        // Create the calendar table head using a copy of weekday labels collection.

        // * We do a copy so we don't mutate the original array.

        tableHead = (function( collection, fullCollection ) {



            // If the first day should be Monday, move Sunday to the end.

            if ( settings.firstDay ) {

                collection.push( collection.shift() )

                fullCollection.push( fullCollection.shift() )

            }



            // Create and return the table head group.

            return _.node(

                'thead',

                _.node(

                    'tr',

                    _.group({

                        min: 0,

                        max: DAYS_IN_WEEK - 1,

                        i: 1,

                        node: 'th',

                        item: function( counter ) {

                            return [

                                collection[ counter ],

                                settings.klass.weekdays,

                                'scope=col title="' + fullCollection[ counter ] + '"'

                            ]

                        }

                    })

                )

            ) //endreturn

        })( ( settings.showWeekdaysFull ? settings.weekdaysFull : settings.weekdaysShort ).slice( 0 ), settings.weekdaysFull.slice( 0 ) ), //tableHead





        // Create the nav for next/prev month.

        createMonthNav = function( next ) {



            // Otherwise, return the created month tag.

            return _.node(

                'div',

                ' ',

                settings.klass[ 'nav' + ( next ? 'Next' : 'Prev' ) ] + (



                    // If the focused month is outside the range, disabled the button.

                    ( next && viewsetObject.year >= maxLimitObject.year && viewsetObject.month >= maxLimitObject.month ) ||

                    ( !next && viewsetObject.year <= minLimitObject.year && viewsetObject.month <= minLimitObject.month ) ?

                    ' ' + settings.klass.navDisabled : ''

                ),

                'data-nav=' + ( next || -1 ) + ' ' +

                _.ariaAttr({

                    role: 'button',

                    controls: calendar.$node[0].id + '_table'

                }) + ' ' +

                'title="' + (next ? settings.labelMonthNext : settings.labelMonthPrev ) + '"'

            ) //endreturn

        }, //createMonthNav





        // Create the month label.

        createMonthLabel = function() {



            var monthsCollection = settings.showMonthsShort ? settings.monthsShort : settings.monthsFull



            // If there are months to select, add a dropdown menu.

            if ( settings.selectMonths ) {



                return _.node( 'select',

                    _.group({

                        min: 0,

                        max: 11,

                        i: 1,

                        node: 'option',

                        item: function( loopedMonth ) {



                            return [



                                // The looped month and no classes.

                                monthsCollection[ loopedMonth ], 0,



                                // Set the value and selected index.

                                'value=' + loopedMonth +

                                ( viewsetObject.month == loopedMonth ? ' selected' : '' ) +

                                (

                                    (

                                        ( viewsetObject.year == minLimitObject.year && loopedMonth < minLimitObject.month ) ||

                                        ( viewsetObject.year == maxLimitObject.year && loopedMonth > maxLimitObject.month )

                                    ) ?

                                    ' disabled' : ''

                                )

                            ]

                        }

                    }),

                    settings.klass.selectMonth,

                    ( isOpen ? '' : 'disabled' ) + ' ' +

                    _.ariaAttr({ controls: calendar.$node[0].id + '_table' }) + ' ' +

                    'title="' + settings.labelMonthSelect + '"'

                )

            }



            // If there's a need for a month selector

            return _.node( 'div', monthsCollection[ viewsetObject.month ], settings.klass.month )

        }, //createMonthLabel





        // Create the year label.

        createYearLabel = function() {



            var focusedYear = viewsetObject.year,



            // If years selector is set to a literal "true", set it to 5. Otherwise

            // divide in half to get half before and half after focused year.

            numberYears = settings.selectYears === true ? 5 : ~~( settings.selectYears / 2 )



            // If there are years to select, add a dropdown menu.

            if ( numberYears ) {



                var

                    minYear = minLimitObject.year,

                    maxYear = maxLimitObject.year,

                    lowestYear = focusedYear - numberYears,

                    highestYear = focusedYear + numberYears



                // If the min year is greater than the lowest year, increase the highest year

                // by the difference and set the lowest year to the min year.

                if ( minYear > lowestYear ) {

                    highestYear += minYear - lowestYear

                    lowestYear = minYear

                }



                // If the max year is less than the highest year, decrease the lowest year

                // by the lower of the two: available and needed years. Then set the

                // highest year to the max year.

                if ( maxYear < highestYear ) {



                    var availableYears = lowestYear - minYear,

                        neededYears = highestYear - maxYear



                    lowestYear -= availableYears > neededYears ? neededYears : availableYears

                    highestYear = maxYear

                }



                return _.node( 'select',

                    _.group({

                        min: lowestYear,

                        max: highestYear,

                        i: 1,

                        node: 'option',

                        item: function( loopedYear ) {

                            return [



                                // The looped year and no classes.

                                loopedYear, 0,



                                // Set the value and selected index.

                                'value=' + loopedYear + ( focusedYear == loopedYear ? ' selected' : '' )

                            ]

                        }

                    }),

                    settings.klass.selectYear,

                    ( isOpen ? '' : 'disabled' ) + ' ' + _.ariaAttr({ controls: calendar.$node[0].id + '_table' }) + ' ' +

                    'title="' + settings.labelYearSelect + '"'

                )

            }



            // Otherwise just return the year focused

            return _.node( 'div', focusedYear, settings.klass.year )

        } //createYearLabel





    // Create and return the entire calendar.

    return _.node(

        'div',

        ( settings.selectYears ? createYearLabel() + createMonthLabel() : createMonthLabel() + createYearLabel() ) +

        createMonthNav() + createMonthNav( 1 ),

        settings.klass.header

    ) + _.node(

        'table',

        tableHead +

        _.node(

            'tbody',

            _.group({

                min: 0,

                max: WEEKS_IN_CALENDAR - 1,

                i: 1,

                node: 'tr',

                item: function( rowCounter ) {



                    // If Monday is the first day and the month starts on Sunday, shift the date back a week.

                    var shiftDateBy = settings.firstDay && calendar.create([ viewsetObject.year, viewsetObject.month, 1 ]).day === 0 ? -7 : 0



                    return [

                        _.group({

                            min: DAYS_IN_WEEK * rowCounter - viewsetObject.day + shiftDateBy + 1, // Add 1 for weekday 0index

                            max: function() {

                                return this.min + DAYS_IN_WEEK - 1

                            },

                            i: 1,

                            node: 'td',

                            item: function( targetDate ) {



                                // Convert the time date from a relative date to a target date.

                                targetDate = calendar.create([ viewsetObject.year, viewsetObject.month, targetDate + ( settings.firstDay ? 1 : 0 ) ])



                                var isSelected = selectedObject && selectedObject.pick == targetDate.pick,

                                    isHighlighted = highlightedObject && highlightedObject.pick == targetDate.pick,

                                    isDisabled = disabledCollection && calendar.disabled( targetDate ) || targetDate.pick < minLimitObject.pick || targetDate.pick > maxLimitObject.pick,

                                    formattedDate = _.trigger( calendar.formats.toString, calendar, [ settings.format, targetDate ] )



                                return [

                                    _.node(

                                        'div',

                                        targetDate.date,

                                        (function( klasses ) {



                                            // Add the `infocus` or `outfocus` classes based on month in view.

                                            klasses.push( viewsetObject.month == targetDate.month ? settings.klass.infocus : settings.klass.outfocus )



                                            // Add the `today` class if needed.

                                            if ( nowObject.pick == targetDate.pick ) {

                                                klasses.push( settings.klass.now )

                                            }



                                            // Add the `selected` class if something's selected and the time matches.

                                            if ( isSelected ) {

                                                klasses.push( settings.klass.selected )

                                            }



                                            // Add the `highlighted` class if something's highlighted and the time matches.

                                            if ( isHighlighted ) {

                                                klasses.push( settings.klass.highlighted )

                                            }



                                            // Add the `disabled` class if something's disabled and the object matches.

                                            if ( isDisabled ) {

                                                klasses.push( settings.klass.disabled )

                                            }



                                            return klasses.join( ' ' )

                                        })([ settings.klass.day ]),

                                        'data-pick=' + targetDate.pick + ' ' + _.ariaAttr({

                                            role: 'gridcell',

                                            label: formattedDate,

                                            selected: isSelected && calendar.$node.val() === formattedDate ? true : null,

                                            activedescendant: isHighlighted ? true : null,

                                            disabled: isDisabled ? true : null

                                        })

                                    ),

                                    '',

                                    _.ariaAttr({ role: 'presentation' })

                                ] //endreturn

                            }

                        })

                    ] //endreturn

                }

            })

        ),

        settings.klass.table,

        'id="' + calendar.$node[0].id + '_table' + '" ' + _.ariaAttr({

            role: 'grid',

            controls: calendar.$node[0].id,

            readonly: true

        })

    ) +



    // * For Firefox forms to submit, make sure to set the buttons’ `type` attributes as “button”.

    _.node(

        'div',

        _.node( 'button', settings.today, settings.klass.buttonToday,

            'type=button data-pick=' + nowObject.pick +

            ( isOpen && !calendar.disabled(nowObject) ? '' : ' disabled' ) + ' ' +

            _.ariaAttr({ controls: calendar.$node[0].id }) ) +

        _.node( 'button', settings.clear, settings.klass.buttonClear,

            'type=button data-clear=1' +

            ( isOpen ? '' : ' disabled' ) + ' ' +

            _.ariaAttr({ controls: calendar.$node[0].id }) ) +

        _.node('button', settings.close, settings.klass.buttonClose,

            'type=button data-close=true ' +

            ( isOpen ? '' : ' disabled' ) + ' ' +

            _.ariaAttr({ controls: calendar.$node[0].id }) ),

        settings.klass.footer

    ) //endreturn

} //DatePicker.prototype.nodes









/**

 * The date picker defaults.

 */

DatePicker.defaults = (function( prefix ) {



    return {



        // The title label to use for the month nav buttons

        labelMonthNext: 'Next month',

        labelMonthPrev: 'Previous month',



        // The title label to use for the dropdown selectors

        labelMonthSelect: 'Select a month',

        labelYearSelect: 'Select a year',



        // Months and weekdays

        monthsFull: [ 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December' ],

        monthsShort: [ 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec' ],

        weekdaysFull: [ 'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday' ],

        weekdaysShort: [ 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat' ],



        // Today and clear

        today: 'Today',

        clear: 'Clear',

        close: 'Close',



        // Picker close behavior

        closeOnSelect: true,

        closeOnClear: true,



        // The format to show on the `input` element

        format: 'd mmmm, yyyy',



        // Classes

        klass: {



            table: prefix + 'table',



            header: prefix + 'header',



            navPrev: prefix + 'nav--prev',

            navNext: prefix + 'nav--next',

            navDisabled: prefix + 'nav--disabled',



            month: prefix + 'month',

            year: prefix + 'year',



            selectMonth: prefix + 'select--month',

            selectYear: prefix + 'select--year',



            weekdays: prefix + 'weekday',



            day: prefix + 'day',

            disabled: prefix + 'day--disabled',

            selected: prefix + 'day--selected',

            highlighted: prefix + 'day--highlighted',

            now: prefix + 'day--today',

            infocus: prefix + 'day--infocus',

            outfocus: prefix + 'day--outfocus',



            footer: prefix + 'footer',



            buttonClear: prefix + 'button--clear',

            buttonToday: prefix + 'button--today',

            buttonClose: prefix + 'button--close'

        }

    }

})( Picker.klasses().picker + '__' )











/**

 * Extend the picker to add the date picker.

 */

Picker.extend( 'pickadate', DatePicker )





}));







