Fs = require 'fs'
Mime = require 'mime'


class Result

    constructor: ->
        @result = {}

        # some default result
        # handler static file
        @register 'file', (file, mime = null) ->
            @response.responded = yes

            Fs.access file, Fs.R_OK, (err) =>
                if err?
                    return @response.status 404
                        .content 'File not found.'
                        .respond()

                mime = Mime.lookup file if not mime?
                stream = Fs.createReadStream file
                
                @response.header 'content-type', mime + '; charset=utf-8'
                    .content stream
                    .respond()

        # blank content
        @register 'blank', ->
            @response.content ''

        # redirect url
        @register 'redirect', (url, permanently = no) ->
            @response.status if permanently then 301 else 302
                .header 'location', url

        # redirect to referer
        @register 'back', ->
            url = @request.header 'referer', '/'
            @response.status 302
                .header 'location', url

        # handler 404
        @register 'notFound', ->
            @response.status 404
                .content 'File not found.'

        # handler json data
        @register 'json', (data) ->
            @response.header 'content-type', 'application/json; charset=utf-8'
                .content JSON.stringify data

        # handler html data
        @register 'content', (content, type = 'text/html') ->
            @response.header 'content-type', type + '; charset=utf-8'
                .content content
    
    # register response method
    register: (name, fn) ->
        @result[name] = (args...) ->
            (request, response) ->
                fn.apply {request, response}, args


module.exports = Result