config = require './config.js'

# Filesystem
fs = require 'fs'

# Crypto
crypto = require 'crypto'

# Request
request = require 'request'

# Express
express = require 'express'
application = express()

# Express add bodyparser middleware
application.use \
    express.bodyParser \
        uploadDir: 'tmp/'

# Application logic here

# Compute the signature for vuforia
compute_signature = (data, verb, request_path, today)->
    md5_hash = crypto.createHash 'md5'
    md5_hash.update(JSON.stringify data)

    string_to_sign =
        # Add the verb
        verb + "\n" +
        # Content-MD5
        md5_hash.digest('hex') + "\n" +
        # Content-type
        "application/json" + "\n" +
        # Date in RFC 2616 format / rfc1123-date
        today.toUTCString() + "\n" +
        # Request path
        request_path

    console.log 'String to sign: --------------------'
    console.log string_to_sign
    console.log '------------------------------------'

    hmac_sha1 = crypto.createHmac('sha1', config.server_secret_key).update(string_to_sign).digest('hex')

    signature = new Buffer(hmac_sha1).toString('base64')

    return signature

# Main function to post to vuforia
vuforia_request_completed = (error, response, body)->
    console.log 'Vuforia completed: ------------------------------------'
    console.log "Error: #{error}"
    #console.log "Response: "
    #console.log response
    console.log "Body: "
    console.log body
    console.log "-------------------------------------------------------"


vuforia_send = (req)->
    # Read the image into a base64 encoded string
    req.body.image_base64 = fs.readFileSync \
        req.files.image.path
        , encoding: 'base64'

    # Create the data to be posted to vuforia
    req.send_data =
        name: req.body.name
        width: req.body.width
        image: req.body.image_base64
        active_flag: true
        application_metadata: req.body.application_metadata

    today = new Date()

    signature = compute_signature req.send_data, 'POST', '/targets', today

    request_options =
        url: config.urls.add_target
        method: 'POST'
        body: JSON.stringify(req.send_data)
        headers:
            'Authorization': "VWS #{config.server_access_key}:#{signature}"
            'Content-type': 'application/json'

    request \
        request_options
        , vuforia_request_completed

    console.log "Vuforia request sent!"

    true

marker_set = (req, res)->
        # http://jsfiddle.net/gg9tM/ - example post form

        res.response_data =
            status: 'ok'
            message: 'request unprocessed'

        vuforia_send req

        res.send(JSON.stringify res.response_data)

        # do the vuforia post

        true

# Set the routes
## Setting the markers
application.post \
    '/marker/set'
    , marker_set

## Checking markers status
# todo: ...

application.listen config.port
console.log "Application listening on port #{config.port}"