function getCurrentTabUrl(callback) {
	var queryInfo = {
		active: true,
		currentWindow: true
	};

	chrome.tabs.query(queryInfo, function(tabs) {
		var tab = tabs[0];

		var url = tab.url;

		callback(url);
	});
}

function replaceBookmark(oldUrl, newUrl) {
	chrome.bookmarks.search({url: oldUrl}, function(bookmarks) {
		for(bookmark of bookmarks) {
			chrome.bookmarks.update(bookmark.id, {url: newUrl});	
		}
	});
}

function copyToClipboard(url) {
	document.oncopy = function(event) {
		event.clipboardData.setData("text/plain", url);
		event.preventDefault();
	};
	document.execCommand('Copy', false, null);
}

chrome.pageAction.onClicked.addListener(function(tab) {
	getCurrentTabUrl(function(url) {
		var filename = url.substr(url.lastIndexOf("/"));

		chrome.storage.sync.get({url: '', tabbehaviour: '', copytoclipboard: false, replacebookmark: false}, function(config) {
			if(config.url == '') {
				alert("Please select a Pomf clone.");
				chrome.tabs.create({ url: "options.html" });
				return;
			}

			var worker = new Worker('worker.js');
			worker.onmessage = function(event) {
				var response = JSON.parse(event.data);

				var newUrl = response.files[0].url;

				switch(config.tabbehaviour)
				{
					case "newtab":
						chrome.tabs.create({url: newUrl});
						break;
					case "replacetab":
						chrome.tabs.update(tab.id, {url: newUrl});
						break;
				}

				if(config.copytoclipboard) {
					copyToClipboard(newUrl);	
				}

				if(config.replacebookmark) {
					replaceBookmark(url, newUrl);
				}
			};
			worker.postMessage(JSON.stringify({pomfclone: config.url, url: url, filename: filename}));	
		});
	});
});

function isCoolUrl(url) {
	url = url.toLowerCase();

	var extensionIndex = url.lastIndexOf('.');
	var extension = url.substr(extensionIndex + 1);

	var validExtensions = ["jpg", "jpeg", "png", "gif", "webm", "gifv"];

	var blackList = ["pomf", "mixtape.moe", "catgirlsare.sexy", "cocaine.ninja"];

	for(black of blackList) {
		if(url.indexOf(black) != -1) {
			return false;
		}
	}

	return validExtensions.indexOf(extension) != -1;
}

chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
	if(isCoolUrl(tab.url) && tab.active)
	{
		chrome.pageAction.show(tabId);
	}
}); 

chrome.tabs.onActivated.addListener(function(activeInfo) {
	chrome.tabs.get(activeInfo.tabId, function(tab) {
		if(isCoolUrl(tab.url))
		{
			chrome.pageAction.show(activeInfo.tabId);
		}
	});
});