chrome.tabs.onUpdated.addListener(onTabUpdated);
chrome.tabs.onRemoved.addListener(onTabRemoved);
chrome.tabs.onActivated.addListener(onTabChanged);
chrome.runtime.onMessage.addListener(onPlaybackUpdate);

function onTabUpdated(tabId, changeInfo, tab) {
	chrome.tabs.get(tabId,party)
}

function onTabRemoved() {

}

function onTabChanged(activeInfo) {
}


function party(tab) {

	var patterns = [
		"https://app.plex.tv",
		"http://app.plex.tv",
		"https://plex.",
		"http://plex."
	];
	
	importantPage = false
	
	for (var i=0;i<patterns.length;i++) {
		if (tab.url.startsWith(patterns[i])) {
			importantPage = true
			
		}
	}
	
	if (importantPage) {
		chrome.tabs.executeScript(tab.id,{"file":"contentScript.js"})
	}
}

function onPlaybackUpdate(request,sender) {
	//console.log("Got update from Plex Web!")
	if (request.type == "stopPlayback" && currentlyPlaying) {
		stopPlayback();
	}
	else if (request.type == "startPlayback") {
		startPlayback(request.artist,request.title,request.duration);
	}
}

var currentTitle;
var currentArtist;
var currentLength;
var alreadyPlayed;
var currentlyPlaying = false;
var lastUpdate = 0;
var alreadyScrobbled = false;


function startPlayback(artist,title,seconds) {
	
	console.log("Playback started!")
	if (artist == currentArtist && title == currentTitle && !currentlyPlaying) {
		console.log("Still previous track!")
		while (alreadyPlayed > currentLength) {
			console.log("This song is being played several times in a row!")
			if (!alreadyScrobbled) {
				scrobble(currentArtist,currentTitle)
				//alreadyScrobbled = true
			}
			alreadyPlayed = alreadyPlayed - currentLength
			alreadyScrobbled = false
			
		}
		d = new Date()
		t = Math.floor(d.getTime()/1000)
		lastUpdate = t
		currentlyPlaying = true
	}
	else if (artist != currentArtist || title != currentTitle) {
		console.log("New track!")
		if (currentlyPlaying) {
			console.log("We were playing another track before, so let's check if we should scrobble that.")
			d = new Date()
			t = Math.floor(d.getTime()/1000)
			delta = t - lastUpdate
			console.log("Since the last update, " + delta + " seconds of music have been played")
			alreadyPlayed = alreadyPlayed + delta
			
		}
		
		console.log("The previous track was played for " + alreadyPlayed + " seconds, that's " + Math.floor(alreadyPlayed/currentLength * 100) + "% of its length.")
		if (alreadyPlayed > currentLength/2 && !alreadyScrobbled) {
			console.log("Enough to scrobble: " + currentArtist + " - " + currentTitle)
			scrobble(currentArtist,currentTitle)
			
		}
		else if (alreadyScrobbled) {
			console.log("We already scrobbled this track tho.")
			alreadyScrobbled = false
		}
		
		
		console.log("But now, new track!")
		d = new Date()
		t = Math.floor(d.getTime()/1000)
		lastUpdate = t
		alreadyPlayed = 0
		currentTitle = title
		currentArtist = artist
		currentLength = seconds
		console.log(artist + " - " + title + " is playing!")
		currentlyPlaying = true
	}
}

function stopPlayback() {
	currentlyPlaying = false
	console.log("Playback stopped!")
	d = new Date()
	t = Math.floor(d.getTime()/1000)
	delta = t - lastUpdate
	console.log("Since the last update, " + delta + " seconds of music have been played")
	alreadyPlayed = alreadyPlayed + delta
	console.log(alreadyPlayed + " seconds of this track have been played overall")
	if ((alreadyPlayed > currentLength/2) && !alreadyScrobbled) {
		console.log("Enough to scrobble: " + currentArtist + " - " + currentTitle)
		scrobble(currentArtist,currentTitle)
		alreadyScrobbled = true
	}
}

function scrobble(artist,title) {
	artiststring = encodeURIComponent(artist)
	titlestring = encodeURIComponent(title)
	var xhttp = new XMLHttpRequest();
	xhttp.open("GET","http://localhost:12345/db/newscrobble?artist=" + artiststring + "&title=" + titlestring,true);
	xhttp.send()
}