Date Fun

String::parseDate = ->
    try
        p = @.split ' '
        t = [0,0,0]
        d = p[0].split '-' if p.length > 0
        t = p[1].split ':' if p.length > 1
        new Date d[2], d[1]-1, d[0], t[0], t[1], t[2]
    catch
        false

String::isDate = ->
    [email protected]().valueOf()

String::isFactor = ->
    !!new Date().parseFactor(@).valueOf()

String::fromNow = ->
    (new Date).shift(@)

Date::parseFactor = (f) ->
    mod = {
        ms: 1
        sec: 1e3
        min: 6e4
        mins: 6e4
        hour: 36e5
        hours: 36e5
        day: 864e5
        days: 864e5
        week: 6048e5
        weeks: 6048e5
    }
    
    +f.replace /([-+]{0,}\d+)\s(\w+)/g, (s, d, m) ->
	    +d * mod[m];
	    
Date::shift = (f) ->
    new Date @.getTime() + @.parseFactor(f)
    
Date::beginDay = ->
    new Date(@.setHours 0,0,0,0)

Date::endDay = ->
    new Date(@.setHours 23,59,59,999)
    
Date::nextDay = ->
    @.shift('+1 day')

Date::prevDay = ->
    @.shift('-1 day')
    
Date::format = (f) ->
    zf = (n) ->
        if n<10 then '0'+n else n
    p = {
        y: @.getFullYear()
        M: zf @.getMonth()+1
        d: zf @.getDate()
        h: zf @.getHours()
        m: zf @.getMinutes()
        s: zf @.getSeconds()
    }
    
    f.replace /\%(\w+)/g, (s, k) ->
        p[k] || s;

Date::mongoId = ->
    ObjectId Math.floor(@/1e3).toString(16)+new Array(17).join '0' if ObjectId?

class DateRange
    constructor: (@s, @f) ->
        @s = @s.parseDate() if typeof @s == 'string'
        @e = @s.shift @f
    shift: (f) ->
        @s = @s.shift f
        @e = @e.shift f
        @
    prolong: (f) ->
        @e = @e.shift f
        @
    range: () ->
        @e - @s
    inRange: (d) ->
        d = d.parseDate() if typeof d == 'string'
        @s < d < @e
    isAfter: (d) ->
        d = d.parseDate() if typeof d == 'string'
        d < @s
    isBefore: (d) ->
        d = d.parseDate() if typeof d == 'string'
        d > @e
    toMongo: ->
        {
            $gte: @s
            $lte: @e
        }

console.log '14-02-1986 15:12:45'.isDate()
console.log 'Try to parse this!'.isDate()
console.log ''.isDate()

console.log '-13 days'.isFactor()
console.log '1c3 ddsfasays'.isFactor()
console.log ''.isFactor()

console.log '14-02-1986 15:12:45'.parseDate()
console.log '14-02-1986 15:12:45'.parseDate().shift '-10 days'
console.log '14-02-1986 15:12:45'.parseDate().shift('-10 days').beginDay()
console.log '14-02-1986 15:12:45'.parseDate().shift('-10 days').endDay()
console.log '14-02-1986 15:12:45'.parseDate().shift('-10 days').endDay().nextDay().prevDay()
console.log '14-02-1986 15:12:45'.parseDate().shift('-10 days').beginDay().endDay().nextDay().prevDay().shift('+10 days').format 'in %y year, day %d of %M time %h:%m:%s'

console.log '-90 days'.fromNow().mongoId()

dr = new DateRange '15-05-2015', '+5 days'

console.log dr.shift('35 min').prolong('1 day').prolong('321 sec').toMongo()
console.log dr.range()

console.log 'Yes!' if dr.inRange '17-05-2015' 
console.log 'Yes!' if dr.isAfter '14-05-2015' 
console.log 'Yes!' if dr.isBefore '22-05-2015'