pubgears.js

var bidfactory = require('../bidfactory.js')
var bidmanager = require('../bidmanager.js')
var consts = require('../constants.json')
var d = document
var SCRIPT = 'script'
var PARAMS = 'params'
var SIZES = 'sizes'
var SIZE = 'size'
var CPM = 'cpm'
var AD = 'ad'
var WIDTH = 'width'
var HEIGHT = 'height'
var PUB_ZONE = 'pub_zone'
var GROSS_PRICE = 'gross_price'
var RESOURCE = 'resource'
var DETAIL = 'detail'
var DATA = 'data'
var BIDDER_CODE_RESPONSE_KEY = 'bidderCode'

var BIDDER_CODE = 'pubgears'

var SCRIPT_ID = 'pg-header-tag'

var ATTRIBUTE_PREFIX = 'data-bsm-'
var SLOT_LIST_ATTRIBUTE = 'slot-list'
var PUBLISHER_ATTRIBUTE = 'pub'
var FLAG_ATTRIBUTE = 'flag'

var AD_UNIT_CODE = 'adUnitCode'
var PUBLISHER_PARAM = 'publisherName'
var PUB_ZONE_PARAM = 'pubZone'




var BID_RECEIVED_EVENT_NAME = 'onBidResponse'
var SLOT_READY_EVENT_NAME = 'onResourceComplete'

var CREATIVE_TEMPLATE = decodeURIComponent("%3Cscript%3E%0A(function(define)%7B%0Adefine(function(a)%7B%0A%09var%20id%3D%20%22pg-ad-%22%20%2B%20Math.floor(Math.random()%20*%201e10)%2C%20d%3D%20document%0A%09d.write(\'%3Cdiv%20id%3D%22\'%2Bid%2B\'%22%3E%3C%2Fdiv%3E\')%0A%09a.push(%7B%0A%09%09pub%3A%20\'%25%25PUBLISHER_NAME%25%25\'%2C%0A%09%09pub_zone%3A%20\'%25%25PUB_ZONE%25%25\'%2C%0A%09%09sizes%3A%20%5B\'%25%25SIZE%25%25\'%5D%2C%0A%09%09flag%3A%20true%2C%0A%09%09container%3A%20d.getElementById(id)%2C%0A%09%7D)%3B%0A%7D)%7D)(function(f)%7Bvar%20key%3D\'uber_imps\'%2Ca%3Dthis%5Bkey%5D%3Dthis%5Bkey%5D%7C%7C%5B%5D%3Bf(a)%3B%7D)%3B%0A%3C%2Fscript%3E%0A%3Cscript%20src%3D%22%2F%2Fc.pubgears.com%2Ftags%2Fb%22%3E%3C%2Fscript%3E%0A")


var TAG_URL = '//c.pubgears.com/tags/h'
var publisher = ''

module.exports = PubGearsAdapter

function PubGearsAdapter() {

	var proxy = null
	var pendingSlots = {}
	var initialized = false

	this['callBids'] = callBids

	function callBids(params) {

		var bids = params[consts.JSON_MAPPING.PL_BIDS]
		var slots = bids.map(getSlotFromBidParam) 
		publisher = bids[0][PARAMS][PUBLISHER_PARAM]

		bids.forEach(function(bid) {

			var name = getSlotFromBidParam(bid)
			pendingSlots[ name ] = bid[AD_UNIT_CODE] 
		})

		proxy = proxy || getScript(SCRIPT_ID) || makeScript(slots, publisher, SCRIPT_ID, TAG_URL)

		if(!initialized)
			registerEventListeners(proxy)
		initialized = true
	}

	function loadScript(script) {

		var anchor = (function(scripts) {
			return scripts[ scripts.length - 1 ]	
		})(d.getElementsByTagName(SCRIPT));

		return anchor.parentNode.insertBefore(script, anchor)
	}

	function getSlotFromBidParam(bid) {

		var size = bid[SIZES][0].join('x')
		var params = bid[PARAMS]
		var slotName = params[PUB_ZONE_PARAM]
		return [ slotName, size ].join('@')
	}

	function getSlotFromResource(resource) {

		var size = resource[SIZE]
		var key = [ resource[PUB_ZONE],  size ].join('@')
	}

	function makeScript(slots, publisher, id, url) {

		var script = d.createElement(SCRIPT)
		script.src = url
		script.id = id 
		script.setAttribute(ATTRIBUTE_PREFIX + SLOT_LIST_ATTRIBUTE, slots.join(' '))
		script.setAttribute(ATTRIBUTE_PREFIX + FLAG_ATTRIBUTE, 'true')
		script.setAttribute(ATTRIBUTE_PREFIX + PUBLISHER_ATTRIBUTE, publisher)

		return loadScript(script)
	}

	function getScript(id) {

		return d.getElementById(id)
	}

	function registerEventListeners(script) {

		script.addEventListener(BID_RECEIVED_EVENT_NAME, onBid, true)
		script.addEventListener(SLOT_READY_EVENT_NAME, onComplete, true)
	}

	function onBid(event) {

		var data = event[DETAIL][DATA]
		var slotKey = getSlotFromResource(data[RESOURCE])
		var adUnitCode = pendingSlots[slotKey]

		if(adUnitCode)
			bidmanager.addBidResponse(adUnitCode, buildResponse(data))
	}

	function buildResponse(eventData) {

		var resource = eventData[RESOURCE]
		var dims = resource[SIZE].split('x')
		var price = Number(eventData[GROSS_PRICE])
		var status = isNaN(price) || price < 0 ? 2 : 1

		var response = bidfactory.createBid(status)
		response[BIDDER_CODE_RESPONSE_KEY] = BIDDER_CODE

		if(status != 1)
			return response

		response[AD] = getCreative(resource)

		response[CPM] = price / 1e3 
		response[WIDTH] = dims[0]
		response[HEIGHT] = dims[1]
		return response
	}

	function getCreative(resource) {

		var bookends = '%%'
		var creative = CREATIVE_TEMPLATE
		var replacementValues = {
			PUBLISHER_NAME: publisher,
			PUB_ZONE: resource[PUB_ZONE],
			SIZE: resource[SIZE]
		}

		Object.keys(replacementValues).forEach(function(token) {

			var find = ['', token, ''].join(bookends)
			var value = replacementValues[token]
			creative = creative.replace(find, value)
		})

		return creative
	}

	function onComplete(event) {

		var data = event[DETAIL][DATA]
		var slotKey = getSlotFromResource(data[RESOURCE])
		delete pendingSlots[slotKey]
	}
}