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class Async
    constructor: ->
        @stack = []

    @IF: (condition, fn) ->
        async = new Async
        async.stack.push (next) ->
            if condition then fn(next) else next()

        process.nextTick async.run.bind(async)
        return async

    ELSEIF: (condition, fn) ->
        @stack.push (next) ->
            if condition then fn(next) else next()

        return this

    ELSE: (fn) ->
        @stack.push fn
        return this

    run: ->
        stack = [@stack...]
        do next = ->
            fn = stack.shift()
            fn(next)

module.exports = Async