/*!

* Date picker for pickadate.js v3.5.0
* 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 })
}

// 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 ) 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.
    var word = string.match( /\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

    // Materialize modified
    })( ( settings.showWeekdaysFull ? settings.weekdaysFull : settings.weekdaysLetter ).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.
    //Materialize modified
    createMonthLabel = function(override) {

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

         // Materialize modified
        if (override == "short_months") {
          monthsCollection = settings.monthsShort;
        }

        // If there are months to select, add a dropdown menu.
        if ( settings.selectMonths  && override == undefined) {

            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 + ' browser-default',
                ( isOpen ? '' : 'disabled' ) + ' ' +
                _.ariaAttr({ controls: calendar.$node[0].id + '_table' }) + ' ' +
                'title="' + settings.labelMonthSelect + '"'
            )
        }

        // Materialize modified
        if (override == "short_months")
            if (selectedObject != null)
            return _.node( 'div', monthsCollection[ selectedObject.month ] );
            else return _.node( 'div', monthsCollection[ viewsetObject.month ] );

        // If there's a need for a month selector
        return _.node( 'div', monthsCollection[ viewsetObject.month ], settings.klass.month )
    }, //createMonthLabel

    // Create the year label.
    // Materialize modified
    createYearLabel = function(override) {

        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
            }

            if ( settings.selectYears  && override == undefined ) {
                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 + ' browser-default',
                    ( isOpen ? '' : 'disabled' ) + ' ' + _.ariaAttr({ controls: calendar.$node[0].id + '_table' }) + ' ' +
                    'title="' + settings.labelYearSelect + '"'
                )
            }
        }

        // Materialize modified
        if (override == "raw")
            return _.node( 'div', focusedYear )

        // Otherwise just return the year focused
        return _.node( 'div', focusedYear, settings.klass.year )
    } //createYearLabel

    // Materialize modified
    createDayLabel = function() {
            if (selectedObject != null)
                return _.node( 'div', selectedObject.date)
            else return _.node( 'div', nowObject.date)
        }
    createWeekdayLabel = function() {
        var display_day;

        if (selectedObject != null)
            display_day = selectedObject.day;
        else
            display_day = nowObject.day;
        var weekday = settings.weekdaysFull[ display_day ]
        return weekday
    }

// Create and return the entire calendar.

return _.node(

    // Date presentation View
    'div',
        _.node(
            'div',
            createWeekdayLabel(),
            "picker__weekday-display"
        )+
        _.node(
            // Div for short Month
            'div',
            createMonthLabel("short_months"),
            settings.klass.month_display
        )+
        _.node(
            // Div for Day
            'div',
            createDayLabel() ,
            settings.klass.day_display
        )+
        _.node(
            // Div for Year
            'div',
            createYearLabel("raw") ,
            settings.klass.year_display
        ),
    settings.klass.date_display
)+
// Calendar container
_.node('div',
    _.node('div',
    ( settings.selectYears ?  createMonthLabel() + createYearLabel() : 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
    })
)
, settings.klass.calendar_container) // end calendar

 +

// * For Firefox forms to submit, make sure to set the buttons’ `type` attributes as “button”.
_.node(
    'div',
    _.node( 'button', settings.today, "btn-flat picker__today",
        'type=button data-pick=' + nowObject.pick +
        ( isOpen && !calendar.disabled(nowObject) ? '' : ' disabled' ) + ' ' +
        _.ariaAttr({ controls: calendar.$node[0].id }) ) +
    _.node( 'button', settings.clear, "btn-flat picker__clear",
        'type=button data-clear=1' +
        ( isOpen ? '' : ' disabled' ) + ' ' +
        _.ariaAttr({ controls: calendar.$node[0].id }) ) +
    _.node('button', settings.close, "btn-flat picker__close",
        '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' ],

    // Materialize modified
    weekdaysLetter: [ 'S', 'M', 'T', 'W', 'T', 'F', 'S' ],

    // Today and clear
    today: 'Today',
    clear: 'Clear',
    close: 'Close',

    // The format to show on the `input` element
    format: 'd mmmm, yyyy',

    // Classes
    klass: {

        table: prefix + 'table',

        header: prefix + 'header',

        // Materialize Added klasses
        date_display: prefix + 'date-display',
        day_display: prefix + 'day-display',
        month_display: prefix + 'month-display',
        year_display: prefix + 'year-display',
        calendar_container: prefix + 'calendar-container',
        // end

        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 )

}));