// This file is licensed under the MIT License (MIT) available on
// http://opensource.org/licenses/MIT.

// This file is used for javascript code
// necessary for some pages to work properly.

"use strict"

function getWidth(a) {
// Return the integer value of the computed width of a DOM node.
// Ex. getWidth(node);
var w = getStyle(a, 'width');
if (w.indexOf('px') !== -1) return parseInt(w.replace('px', ''));
var p = [getStyle(a, 'padding-top'), getStyle(a, 'padding-right'), getStyle(a, 'padding-bottom'), getStyle(a, 'padding-left')];
for (var i = 0; i < 4; i++) {
	p[i] = (p[i].indexOf('px') !== -1) ? parseInt(p[i]) : 0;
}
return Math.max(0, a.offsetWidth - p[1] - p[3]);
}

function getHeight(a) {
// Return the integer value of the computed height of a DOM node.
// Ex. getHeight(node);
var h = getStyle(a, 'height');
if (h.indexOf('px') !== -1) return parseInt(h.replace('px', ''));
var p = [getStyle(a, 'padding-top'), getStyle(a, 'padding-right'), getStyle(a, 'padding-bottom'), getStyle(a, 'padding-left')];
for (var i = 0; i < 4; i++) {
	p[i] = (p[i].indexOf('px') !== -1) ? parseInt(p[i]) : 0;
}
return Math.max(0, a.offsetHeight - p[0] - p[2]);
}

function getLeft(a) {
// Return the integer value of the computed distance between given node and the browser window.
// Ex. getLeft(node);
var b = a.offsetLeft;
while (a.offsetParent) {
	a = a.offsetParent;
	b += a.offsetLeft;
}
return b;
}

function getTop (a) {
// Return the integer value of the computed distance between given node and the browser window.
// Ex. getTop(node);
var b = a.offsetTop;
while (a.offsetParent) {
	a = a.offsetParent;
	b += a.offsetTop;
}
return b;
}

function getPageYOffset() {
// Return the integer value for the vertical position of the scroll bar.
return window.pageYOffset || document.documentElement.scrollTop;
}

function getPageXOffset() {
// Return the integer value for the horizontal position of the scroll bar.
return window.pageXOffset || document.documentElement.scrollLeft;
}

function getWindowY() {
// Return the integer value for the browser window height.
return window.innerHeight || document.documentElement.clientHeight;
}

function getWindowX() {
// Return the integer value for the browser window width.
return window.innerWidth || document.documentElement.clientWidth;
}

function isMobile() {
// Return true if the mobile CSS stylesheet is used.
if (getStyle(document.getElementById('detectmobile'), 'display') != 'none') return true;
return false;
}

function scrollToNode(t) {
// Scroll to any node on the page.
if (document.body.getAttribute('data-scrollstatus') != null) {
	clearInterval(document.body.getAttribute('data-scrollstatus'));
	document.body.removeAttribute('data-scrollstatus');
}
var delay = 800;
var py = getPageYOffset();
var fy = getTop(t)
var dy = fy - py;
var x = getPageXOffset();
var oti = new Date().getTime();
document.body.setAttribute('data-scrollstatus', setInterval(function() {
	var nti = new Date().getTime() - oti;
	if (nti >= delay) {
		window.scrollTo(x, fy);
		clearInterval(document.body.getAttribute('data-scrollstatus'));
		document.body.removeAttribute('data-scrollstatus');
		return;
	}
	var p = nti / delay;
	p = p * (1 + (0.5 * (1 - p)));
	window.scrollTo(x, (py + (dy * p)).toFixed(0));
}, 10));
}

function supportCSS(id) {
// Return true if the browser supports given CSS feature.
var domPrefixes = 'Webkit Moz ms O'.split(' ');
var nd = document.createElement('DIV');
id = id.toLowerCase();
if (nd.style[id] !== undefined) return true;
idc = id.charAt(0).toUpperCase() + id.substr(1);
for (var i = 0, n = domPrefixes.length; i < n; i++) {
	if (nd.style[domPrefixes[i] + idc] !== undefined) return true;
}
return false;
}

function loadYoutubeVideo(e) {
// Load Youtube video on target node on click.
function init(e) {
	var t = getEvent(e, 'target'),
	    nd = document.createElement('IFRAME');
	while (t.getAttribute('data-youtubeurl') === null || t.getAttribute('data-youtubeurl') === '') t = t.parentNode;
	nd.src = t.getAttribute('data-youtubeurl');
	nd.setAttribute('frameborder', 0);
	nd.setAttribute('allowfullscreen', true);
	t.innerHTML = '';
	t.appendChild(nd);
	t.onclick = '';
}
onTouchClick(e, init);
}

function expandBox(t) {
// Expand or shrink box.
var phe = getHeight(t);
t.style.transition = t.style.MozTransition = t.style.WebkitTransition = 'all 0s ease 0s';
if (t.className.indexOf('expanded') === -1) addClass(t, 'expanded');
else removeClass(t, 'expanded');
t.style.height = '';
var nhe = getHeight(t);
t.style.height = phe + 'px';
// Async call to prevent transition from applying on last style.height statement.
setTimeout(function() {
	t.style.transition = t.style.MozTransition = t.style.WebkitTransition = '';
	t.style.height = nhe + 'px';
}, 20);
}

function boxShow(e) {
// Display the box content when the user click a box on the "Secure your wallet" page.
function init(e) {
	var t = getEvent(e, 'target');
	while (t.nodeName != 'DIV') t = t.parentNode;
	expandBox(t);
	cancelEvent(e);
}
onTouchClick(e, init);
}

function faqShow(e) {
// Display the content of a question in the FAQ at user request.
function init(e) {
	var t = getEvent(e, 'target');
	while (t.nodeType != 1 || t.nodeName != 'DIV') t = t.nextSibling;
	expandBox(t);
	cancelEvent(e);
}
onTouchClick(e, init);
}

function materialShow(e) {
// Display more materials on the "Press center" page at user request.
function init(e) {
	var t = getEvent(e, 'target'),
	    p = t;
	while (p.nodeType != 1 || p.nodeName != 'DIV') p = p.parentNode;
	expandBox(p);
	cancelEvent(e);
}
onTouchClick(e, init);
}

function librariesShow(e) {
// Display more open source projects on the "Development" page at user request.
function init(e) {
	var t = getEvent(e, 'target'),
	    p = t;
	while (p.nodeType != 1 || p.nodeName != 'UL') p = p.parentNode;
	expandBox(p);
	cancelEvent(e);
}
onTouchClick(e, init);
}

function freenodeShow(e) {
// Display freenode chat window on the "Development" page at user request.
document.getElementById('chatbox').innerHTML = '<iframe style=width:98%;min-width:400px;height:600px src="http://webchat.freenode.net/?channels=bitcoin-dev" />';
cancelEvent(e);
}

function updateToc() {
// Update table of content active entry and browser url on scroll.
var pageoffset;
var windowy;
var toc;
var fallback;
var first;
var last;
var closer;
var init = function() {
	setenv();
	updatehistory();
	updatetoc();
}
// Set variables.
var setenv = function() {
	pageoffset = getPageYOffset();
	windowy = getWindowY();
	toc = document.getElementById('toc');
	fallback = document.getElementsByTagName('H2')[0];
	first = [fallback, getTop(fallback)];
	last = [fallback, getTop(fallback)];
	closer = [fallback, getTop(fallback)];
	// Find all titles in toc.
	var nodes = [];
	var tags = ['H2', 'H3', 'H4', 'H5', 'H6'];
	for (var i = 0, n = tags.length; i < n; i++) {
		for (var ii = 0, t = document.getElementsByTagName(tags[i]), nn = t.length; ii < nn; ii++) {
			if (t[ii].className.indexOf('no_toc')!==-1) continue;
			nodes.push(t[ii]);
		}
	}
	// Find first title, last title and closer title.
	for (var i = 0, n = nodes.length; i < n; i++) {
		if (!nodes[i].id) continue;
		var top = getTop(nodes[i]);
		if (top < first[1]) first = [nodes[i], top];
		if (top > last[1]) last = [nodes[i], top];
		if (top < pageoffset + 10 && top > closer[1]) closer = [nodes[i], top];
	}
	// Set closer title to first or last title if at the top or bottom of the page.
	if (pageoffset < first[1]) closer = [first[0], first[1]];
	if (windowy + pageoffset >= getHeight(document.body)) closer = [last[0], last[1]];
}
// Update toc position and set active toc entry.
var updatetoc = function() {
	// Set bottom and top to fit within window and not overflow its parent node.
	var div = toc.getElementsByTagName('DIV')[0];
	if (pageoffset > getTop(toc)) {
		addClass(div, 'scroll');
		div.style.top = '20px';
		div.style.bottom = Math.max((pageoffset + windowy) - (getHeight(toc.parentNode) + getTop(toc.parentNode)), 20) + 'px';
	} else removeClass(div, 'scroll');
	// Remove .active class from toc and find new active toc entry.
	var a = false;
	for (var i = 0, t = toc.getElementsByTagName('*'), n = t.length; i < n; i++) {
		removeClass(t[i], 'active');
		if (t[i].nodeName == 'A' && t[i].getAttribute('href') == '#' + closer[0].id) a = t[i];
	}
	if (a === false) return;
	// Set .active class on new active toc entry.
	var nd = a;
	while (nd.parentNode.nodeName == 'LI' || nd.parentNode.nodeName == 'UL') {
		addClass(nd, 'active');
		nd = nd.parentNode;
	}
	// Auto-scroll in toc to keep active toc entry visible.
	var nd = a;
	var otop = nd.offsetTop;
	while (nd.offsetParent != div && nd.offsetParent) {
		nd = nd.offsetParent;
		otop += nd.offsetTop;
	}
	var bdiff = getHeight(a) + otop - div.scrollTop - getHeight(div);
	var tdiff = getHeight(a) - otop + div.scrollTop;
	if (tdiff > 0 || bdiff > 0) div.scrollTop -= tdiff;
}
// Update browser url.
var updatehistory = function() {
	// Don't call window.history if not supported.
	if (!window.history || !window.history.replaceState) return;
	// Don't update window url when it doesn't need to be updated.
	if (new RegExp('#' + closer[0].id + '$').test(window.location.href.toString())) return;
	// Don't update window url when the window is over the first title in the page.
	if (pageoffset < first[1]) return;
	// Don't update window url when page is not loaded, or user just clicked a url.
	if (!toc.hasAttribute('data-timestamp') || toc.getAttribute('data-timestamp') > new Date().getTime() - 1000) return;
	window.history.replaceState(null, null, '#' + closer[0].id);
}
// Update the toc when the page stops scrolling.
var evtimeout = function() {
	toc = document.getElementById('toc');
	clearTimeout(toc.getAttribute('data-timeout'));
	toc.setAttribute('data-timeout', setTimeout(init, 1));
}
// Reset timestamp on page load and each time the user clicks a url.
var evtimestamp = function() {
toc = document.getElementById('toc');
document.getElementById('toc').setAttribute('data-timestamp', new Date().getTime());
}
addEvent(window, 'scroll', evtimeout);
addEvent(window, 'popstate', evtimestamp);
addEvent(window, 'load', evtimestamp);
init();
}

function updateIssue(e) {
// Update GitHub issue link pre-filled with current page location.
var t = getEvent(e, 'target');
t.href = 'https://github.com/bitcoin-dot-org/bitcoin.org/issues/new?body=' + encodeURIComponent('Location: ' + window.location.href.toString() + "\n\n");
}

function updateSource(e){
// Update GitHub source file link pre-filled with current page location.
if (!document.getElementsByClassName) return;
var t = getEvent(e, 'target'),
    nodes = document.getElementsByClassName('sourcefile'),
    pageoffset = Math.max(0, getPageYOffset() + 100),
    windowy = getWindowY(),
    fallback = nodes[0],
    first = [fallback, getTop(fallback)],
    last = [fallback, getTop(fallback)],
    closer = [fallback, getTop(fallback)];
// Find first, last and closer node.
for (var i = 0, n = nodes.length; i < n; i++) {
	var top = getTop(nodes[i]);
	if (top < first[1]) first = [nodes[i], top];
	if (top > last[1]) last = [nodes[i], top];
	if (top < pageoffset + 10 && top > closer[1]) closer = [nodes[i], top];
}
// Set closer title to first or last title if at the top or bottom of the page.
if (pageoffset < first[1]) closer = [first[0], first[1]];
if (windowy + pageoffset >= getHeight(document.body)) closer = [last[0], last[1]];
// Set updated url to source file.
t.href = 'https://github.com/bitcoin-dot-org/bitcoin.org/edit/master/' + closer[0].getAttribute('data-sourcefile');
}

function disclaimerClose(e) {
// Auto close temporary disclaimer in devel-docs.
if (e) cancelEvent(e);
var t = document.getElementById('develdocdisclaimer')
t.parentNode.removeChild(t);
if (typeof(Storage) === 'undefined') return;
sessionStorage.setItem('develdocdisclaimerclose', '1');
}

function disclaimerAutoClose() {
// Auto close temporary disclaimer in devel-docs if session says so.
if (typeof(Storage) === 'undefined') return;
if (sessionStorage.getItem('develdocdisclaimerclose') === '1') disclaimerClose();
}

function walletMenuListener(e) {
// Listen for events on the wallet menu.
var t = getEvent(e, 'target'),
    walletSelectPlatform = function() {
	if (t.nodeName != 'A') return;
	if (t.parentNode.className.indexOf('active') !== -1) walletShowPlatform(t.getAttribute('data-walletcompat'));
	if (isMobile() && t.parentNode.getElementsByTagName('UL').length == 0) scrollToNode(document.getElementById('wallets'));
    };
// Pre-process events and call appropriate function.
onTouchClick(e, walletSelectPlatform);
}

function walletListener(e) {
// Listen for events on wallets.
var t = getEvent(e, 'target'),
    walletShow = function() {
	// Show wallet on click on mobile or desktop.
	if (t.id == 'wallets') return;
	while (t.parentNode && t.parentNode.id != 'wallets') t = t.parentNode;
	if (!t.parentNode) return;
	if (isMobile()) {
		var p = document.getElementById('walletsmobile');
		t = t.cloneNode(true);
		p.innerHTML = '';
		p.appendChild(t);
		scrollToNode(p);
	} else {
		addClass(t, 'active');
		addEvent(document.body, 'click', walletListener);
	}
    },
    walletHide = function() {
	// Disable wallet when the mouse clicks elsewhere.
	for (var i = 0, wallets = document.getElementById('wallets').childNodes, n = wallets.length; i < n; i++) {
		if (wallets[i].nodeType != 1) continue;
		removeClass(wallets[i], 'active');
	}
	removeEvent(document.body, 'click', walletListener);
    };
// Call appropriate function on click.
onTouchClick(e, function() {
	walletHide();
	walletShow();
});
}

function walletScoreListener(e) {
// Listen for events on wallet scores and display them on tap.
var init = function(e) {
	var t = getEvent(e, 'target');
	while (!t.parentNode.parentNode.parentNode.id) t = t.parentNode;
	(t.className.indexOf('hover') === -1) ? addClass(t, 'hover') : removeClass(t, 'hover');
};
onTouchClick(e, init);
}

function walletShowPlatform(platform) {
// Show wallets for given platform in the menu.
var t = null,
    fallback = '',
    walletMenu = document.getElementById('walletmenu'),
    getMenuState = function() {
	// Find active node in the menu for given platform and fallback category if in a submenu.
	for (var i = 0, nds = walletMenu.getElementsByTagName('A'), n = nds.length; i < n; i++) {
		if (nds[i].getAttribute('data-walletcompat') != platform) continue;
		if (nds[i].getAttribute('data-active') == 1) return false;
		t = nds[i];
		var p = nds[i].parentNode.parentNode.parentNode;
		if (p.nodeName == 'LI') fallback = p.getElementsByTagName('A')[0].getAttribute('data-walletcompat');
		break;
	}
	return true;
    },
    updateMenu = function() {
	// Set active nodes in the menu for the new platform.
	addClass(walletMenu.getElementsByTagName('UL')[0], 'menutap');
	for (var i = 0, nds = walletMenu.getElementsByTagName('A'), n = nds.length; i < n; i++) {
		nds[i].removeAttribute('data-active');
		removeClass(nds[i].parentNode, 'active');
	}
	if (platform != 'default') {
		t.setAttribute('data-active', '1');
		addClass(t.parentNode, 'active');
		addClass(t.parentNode, 'hover');
		var p = t.parentNode.parentNode.parentNode;
		if (p.nodeName == 'LI') {
			addClass(p, 'active');
			addClass(p, 'hover');
		}
	}
    },
    updateWallets = function() {
	// Replace wallets by those for given platform and rotate them.
	var p = document.getElementById('wallets');
	var lasttimeout = p.getAttribute('data-timeout');
	var timeout = (lasttimeout !== null && lasttimeout !== '' && supportCSS('transition')) ? 200 : 1;
	addClass(p, 'disabled');
	addClass(p, 'nohover');
	clearTimeout(lasttimeout);
	p.setAttribute('data-timeout', setTimeout(function() {
		p.innerHTML = '';
		var platforms = (platform == 'default') ? ['desktop', 'mobile'] : [platform];
		for (var i = 0, nds = document.getElementById('walletsswitch').childNodes, n = nds.length; i < n; i++) {
			if (nds[i].nodeType != 1) continue;
			var id = nds[i].id.split('-')[1];
			if (document.getElementById('wallet-' + id)) continue;
			var nd = null;
			for (var ii = 0, nn = platforms.length; ii < nn; ii++) {
				var wp = document.getElementById('wallet-' + id + '-' + platforms[ii]);
				if (wp) var nd = wp;
			}
			if (nd === null) {
				var wf = document.getElementById('wallet-' + id + '-' + fallback);
				if (wf && wf.getAttribute('data-walletcompat').indexOf(platform) !== -1) var nd = wf;
			}
			if (nd === null) continue;
			nd = nd.cloneNode(true);
			nd.id = 'wallet-' + id;
			p.appendChild(nd);
		}
		walletRotate();
		removeClass(p, 'disabled');
		document.getElementById('walletsmobile').innerHTML = '';
	}, timeout));
    };
if(!getMenuState()) return;
updateMenu();
updateWallets();
}

function walletRotate() {
// Rotate wallets once a day.
var ar = {
	1: [],
	2: [],
	3: [],
	4: []
}
for (var i = 0, nds = document.getElementById('wallets').childNodes, n = nds.length; i < n; i++) {
	if (nds[i].nodeType != 1) continue;
	ar[parseInt(nds[i].getAttribute('data-walletlevel'))].push(nds[i]);
}
var sum = Math.floor(new Date() / 86400000);
for (var k in ar) {
	if (ar[k].length == 0) continue;
	var pre = ar[k][ar[k].length - 1].nextSibling;
	for (i = 0, n = sum % ar[k].length; i < n; i++) ar[k][i].parentNode.insertBefore(ar[k][i], pre);
}
}

function makeEditable(e) {
// An easter egg that makes the page editable when user click on the page and hold their mouse button for one second.
// This trick allows translators and writers to preview their work.
if (!e) var e = window.event;
switch (getEvent(e, 'type')) {
	case 'mousedown':
		if ((e.which && e.which == 3) || (e.button && e.button == 2)) return;
		var t = getEvent(e, 'target');
		while (t.parentNode) {
			if (getStyle(t, 'overflow') == 'auto' || getStyle(t, 'overflow-y') == 'auto' || getStyle(t, 'overflow-x') == 'auto') return;
			t = t.parentNode;
		}
		addEvent(document.body, 'mouseup', makeEditable);
		addEvent(document.body, 'mousemove', makeEditable);
		document.body.setAttribute('timeoutEdit', setTimeout(function() {
			removeEvent(document.body, 'mouseup', makeEditable);
			removeEvent(document.body, 'mousemove', makeEditable);
			var c = document.getElementById('content');
			c.contentEditable = true;
			c.style.borderColor = '#bfbfbf';
			setTimeout(function() {
				c.style.borderColor = '';
			}, 200);
		}, 1000));
		break;
	case 'mouseup':
	case 'mousemove':
		removeEvent(document.body, 'mouseup', makeEditable);
		removeEvent(document.body, 'mousemove', makeEditable);
		clearTimeout(document.body.getAttribute('timeoutEdit'));
		break;
}
}

// Add makeEditable event listener
var xint = setInterval(function() {
if (!document.body) return;
addEvent(document.body, 'mousedown', makeEditable);
clearInterval(xint);
}, 200);