/*
 * IPS embed handling
 * https://www.invisioncommunity.com
 */
( function () {
"use strict";

var _origin;
var _div;
var _posting = false;
var _timer;
var _timeout = 200; //ms
var _embedId = '';
var _embedMaxWidth = null;
var _initialHeight = 0;

/**
* Init method, called when the document is ready
*
* @returns {void}
*/
function init() {
// Check for postMessage and JSON support
if( !window.postMessage || !window.JSON.parse ){
return;
}

// Work out our URL
_div = ips.utils.get('ipsEmbed');
var url = ips.utils.parseURL( window.location );

if( url.protocol == '' || url.protocol == ':' ){
ips.utils.log( url );
url.protocol = window.location.protocol;
}

// Set our origin
_origin = url.protocol + '//' + url.host;
ips.utils.log( "Origin in loader is " + _origin );

// Hide the content
_div.style.opacity = '0.00001';

_initialHeight = ips.utils.getObjHeight( _div );

// Do we have a specified maxWidth here?
var maxWidthElem = document.querySelector('[data-embedInfo-maxSize]');

if( maxWidthElem ){
_embedMaxWidth = parseInt( maxWidthElem.getAttribute('data-embedInfo-maxSize') );
maxWidthElem.style.maxWidth = _embedMaxWidth + "px";
}

// Check for any truncated text
var truncated = document.querySelectorAll('[data-truncate]');

if( truncated ){
for( var n = 0; n < truncated.length; n++ ){
var size = parseInt( truncated[ n ].getAttribute('data-truncate') || 5 );
clamp( truncated[ n ], size );
}
}

ips.eventHandler.on( document.body, 'click', clickLink );

// Set all links to open in a new tab/window
var links = document.querySelectorAll('a');
for( var i = 0; i < links.length; i++ ){
links[i].setAttribute('target', '_blank');
}

startTimeout();
};

var _showEmbed = function () {
document.body.className = document.body.className.replace('unloaded ', '');
ips.utils.fadeIn( _div );
};

/**
* Starts our main loop, which posts messages to the parent frame as needed
*
* @returns {void}
*/
var startTimeout = function () {

var currentSize = 0;
var repeats = 0;

ips.utils.log("Starting timeout...");

// Main loop
_timer = setInterval( function () {
// What we want to do here is make the loading process more pleasant and less jumpy.
// To do that, we'll make the embed invisible until we've fetched the same height 6 times
// in a row (approx 1 second). If that happens we'll assume it has finished loading, and then
// we'll fade it in and start sending the recorded height to the parent for resizing.

var height = ips.utils.getObjHeight( _div );

// If we HAVEN'T started posting our size
if( !_posting ){
if( height == currentSize ){
repeats++;
} else {
// The height has changed, so reset our repeat counter
repeats = 0;
}

if( repeats == 6 ){
_posting = true;
_showEmbed();
}
}

currentSize = height;

if( _posting ){
if( _embedMaxWidth !== null ){
_postMessage('dims', {
height: height,
width: _embedMaxWidth
});
} else {
_postMessage('height', {
height: height
});
}
}
}, _timeout);
};

/**
* Posts a message to the iframe
*
* @param {number} [pageNo] Page number to load
* @returns {void}
*/
var _postMessage = function (method, obj) {
// Send to parent window
window.top.postMessage( JSON.stringify( ips.utils.extendObj( obj || {}, {
method: method,
embedId: _embedId
} ) ), _origin );
};

/**
* Handles link clicks, to check for dialogs. If one is found, the options are passed
* up to the parent to display.
*
* @returns {void}
*/
var clickLink = function (e) {
var link = e.target.closest('a');

if( link !== null ){
if( link.hasAttributes() ){
var output = {};
var attrs = link.attributes;

for( var i = attrs.length - 1; i > 0; i-- ){
if( attrs[i].name !== 'class' && attrs[i].name !== 'title' ){
output[ attrs[i].name ] = attrs[i].value;
}
}

if( output['data-ipsdialog'] !== undefined ){
e.preventDefault();

_postMessage('dialog', {
url: link.href,
options: output
});
}
}
}
};

/**
* Events sent to the iframe
*/
var messageEvents = {
/**
* The parent is ready for messages
*
* @param {object} data Data from the iframe
* @returns {void}
*/
ready: function (data) {
_embedId = data.embedId;
_postMessage('ok');
},

stop: function (data) {
clearInterval( _timer );
ips.eventHandler.off( window, 'message', windowMessage );
},

responsiveState: function (data) {
if( data.currentIs === 'phone' ){
document.body.className += ' ipsRichEmbed_phone';
} else {
document.body.className = document.body.className.replace( ' ipsRichEmbed_phone', '' );
}
}
};

/*******************************************************************************************/
/* Boring stuff below */
// Main message handler
ips.eventHandler.on( window, 'message', windowMessage );

function windowMessage (e) {
if( e.origin !== _origin ){
ips.utils.log( e.origin + 'does not equal' + _origin );
return;
}

try {
var pmData = JSON.parse( e.data );
var method = pmData.method;
} catch (err) {
ips.utils.error("iframe: invalid data.");
return;
}

if( method && typeof messageEvents[ method ] != 'undefined' ){
ips.utils.log("Called " + method );
messageEvents[ method ].call( this, pmData );
} else {
ips.utils.log("Method " + method + " doesn't exist");
}
};

ips.utils.contentLoaded( window, function () {
init();
});
})();