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/*
*********************************************************************
SNAPCHAT PAGE VIEW PIXEL
	purpose: tracking success of snapchat ads
	other names: scevent, sc-static.net
	owners: dion, caitlin
	ticket: WS-2913
	added: sep 14, 2018
	updated: oct 3, 2018
*********************************************************************
*/

(function(){

	// *********************************************************************
	// GET EMAIL FROM COOKIE - ONLY USE AFTER HASHING
	// *********************************************************************
	var email = (document.cookie.match(/(email|curEmailIdsc)=([^;]+)/i)||['','',''])[2].trim().toLowerCase();
	var hashedEmail;
	hashEmail(email).then(hash => {
		hashedEmail = hash;

		run_snapchat_pixel(email ? hashedEmail : null);
	});



	// *********************************************************************
	// sha256 hash of email (originally from WS-2454)
	// *********************************************************************	

	function hashEmail(email) {
		// Feature checks for Uint8Array, Promises, and crypto.subtle
		var _crypto = window.crypto || window.msCrypto;
		if(!(typeof _crypto == 'object' && !!_crypto.subtle && typeof Uint8Array == 'function' && typeof Promise == 'function')){
			return null;
		}

		function hex(buffer){
			var hexCodes = [];
			var view = new DataView(buffer);
			for (var i=0; i<view.byteLength; i+=4){
				// Using getUint32 reduces the number of iterations needed (we process 4 bytes each time)
				var value = view.getUint32(i);
				// toString(16) will give the hex representation of the number without padding
				var stringValue = value.toString(16);
				// We use concatenation and slice for padding
				var padding = '00000000';
				var paddedValue = (padding + stringValue).slice(-padding.length);
				hexCodes.push(paddedValue);
			}

			// Join all the hex strings into one
			return hexCodes.join('');
		}

		// We transform the string into an arraybuffer.
		var buffer = new TextEncoder("utf-8").encode(email);
		return _crypto.subtle.digest("SHA-256", buffer).then(function (hash) {
			return hex(hash);
		});
	}





	// *********************************************************************
	// SNAPCHAT PIXEL
	// *********************************************************************

	function run_snapchat_pixel(hashedEmail){

		(function(win, doc, sdk_url) {
			if (win.snaptr) return;
			var tr = win.snaptr = function() {
				tr.handleRequest ? tr.handleRequest.apply(tr, arguments) : tr.queue.push(arguments);
			};
			tr.queue = [];
			var s = 'script';
			var new_script_section = doc.createElement(s);
			new_script_section.async = !0;
			new_script_section.src = sdk_url;
			var insert_pos = doc.getElementsByTagName(s)[0];
			insert_pos.parentNode.insertBefore(new_script_section, insert_pos);
		})(window, document, 'https://sc-static.net/scevent.min.js');
		snaptr('init', 'fea5dcf0-9dce-497f-9da1-39d657056fbd', hashedEmail ? {
			'user_hashed_email': hashedEmail
		} : {});


		snaptr('track', 'PAGE_VIEW');
	}

})();