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###
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 new Date().getTime() wrapper to use as timer.
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 @class bkcore.Timer
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 @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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###
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class Timer
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  ###
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    Creates a new timer, inactive by default.
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    Call Timer.start() to activate.
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  constructor: ()->
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    @time =
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      start: 0
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      current: 0
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      previous: 0
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      elapsed: 0
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      delta: 0
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    @active = false
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  ###
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    Starts/restarts the timer.
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  ###
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  start: ()->
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    now = (new Date).getTime()
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    @time.start = now
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    @time.current = now
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    @time.previous = now
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    @time.elapsed = 0
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    @time.delta = 0
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    @active = true
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  ###
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    Pauses(true)/Unpauses(false) the timer.
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    @param bool Do pause
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  pause: (doPause)->
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    @active = not doPause
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    Update method to be called inside a RAF loop
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  update: ()->
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    if not @active then return
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    now = (new Date).getTime()
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    @time.current = now
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    @time.elapsed = @time.current - @time.start
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    @time.delta = now - @time.previous
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    @time.previous = now
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    Returns a formatted version of the current elapsed time using msToTime().
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  getElapsedTime: ()->
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    return @constructor.msToTime(@time.elapsed)
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    Formats a millisecond integer into a h/m/s/ms object
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    @param x int In milliseconds
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    @return Object{h,m,s,ms}
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  ###
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  @msToTime: (t)->
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    ms = t%1000
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    s = Math.floor((t/1000)%60)
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    m = Math.floor((t/60000)%60)
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    h = Math.floor(t/3600000)
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    return {h:h, m:m, s:s, ms,ms}
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  ###
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    Formats a millisecond integer into a h/m/s/ms object with prefix zeros
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    @param x int In milliseconds
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    @return Object<string>{h,m,s,ms}
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  ###
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  @msToTimeString: (t)->
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    time = @msToTime(t)
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    time.h = @zfill(time.h, 2)
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    time.m = @zfill(time.m, 2)
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    time.s = @zfill(time.s, 2)
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    time.ms = @zfill(time.ms, 4)
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    return time
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    Convert given integer to string and fill with heading zeros
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    @param num int Number to convert/fill
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    @param size int Desired string size
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  @zfill: (num, size)->
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    len = size - num.toString().length
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    return if len > 0 then new Array(len+1).join('0') + num else num.toString()
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###
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  Exports
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  @package bkcore
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###
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exports = exports ? @
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exports.bkcore ||= {}
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exports.bkcore.Timer = Timer
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