// TimerUI – for home cinemas

// == Dependencies ==

var mediaType; // for compatibility
var playerExists = false; // is set to true below if player exists
var checkMediaType_enabled = true; // for debugging purposes
var media_element = {}; // declaring as object

function checkMediaType() {
	// checks whether it is a video or an audio tag
	if ( checkMediaType_enabled ) { 
			var mediaTypeBeforeCheck = mediaType;
			if (document.getElementsByTagName("video")[0]) { playerExists = true; mediaType = "video"; }
			if (document.getElementsByTagName("audio")[0]) { playerExists = true; mediaType = "audio"; }
			var mediaTypeAfterCheck = mediaType;
			   if (mediaTypeBeforeCheck != mediaTypeAfterCheck)
				  // Only show media type in console if it has changed.
				  console.log("Detected media type: " + mediaType);
		media_element = document.getElementsByTagName(mediaType)[0];
		// Set back to false if no player is found after using customMediaElement.
		media_element ? playerExists=true : playerExists=false;
	}
}

function customMediaElement(custom_media_element) {
	checkMediaType_enabled = false;
	if (custom_media_element) {
		playerExists = true;
		media_element = custom_media_element;
		console.log("customMediaElement: Custom media element set. Reset using checkMediaType_enabled=true.");
	} else { console.error("customMediaElement: No such media element found."); }
}
var customTitleElement;

function checkFileExtension(ext) {
	if (typeof(ext) == "string") {
		ext = ext.toLowerCase(); // case-insensitive
		// string
		if (document.location.href.search(new RegExp(ext+"$", "i")) > -1) return true; else return false;
	} else if (typeof(ext) == "object") {
		// array – check against multiple strings
		for (var count=0; count < ext.length; count++) {
			if (document.location.href.search(new RegExp(ext[count]+"$", "i")) > -1) return true;
			if (count == ext.length-1) return false; // if no matches after going through them all
		}
	}
}

function isDomain(domain) { 
	// Using .search() instead of .includes() to improve browser compatibility.
	if (window.location.hostname.search(domain) >= 0) return true; else return false; 
}

// symbols
var symbol_play = "▶&#xFE0E;&thinsp;"; // thin space for alignment
var	symbol_pause="&#10074;&thinsp;&#10074;"; // instead of "⏸" due to Edge browser putting an immutable blue box around it.

// mousedown status
var mousedown_status;
window.addEventListener("mousedown", function(){mousedown_status=true; } );
window.addEventListener("mouseup", function(){mousedown_status=false; } );

function appendChildWithID(tagName,tagID,parent_element) {
	// default parent element to document.body if unspecified
	if (parent_element === undefined) parent_element = document.body;
	parent_element.appendChild(document.createElement(tagName)); // add div
	parent_element.lastElementChild.id=tagID; // give it ID
}

function addStyle(new_style,parent_element) {
	if (parent_element === undefined) parent_element = document.body;
	parent_element.appendChild(document.createElement("style")); // add style
	parent_element.lastElementChild.innerHTML = new_style;
}

// time variables
var media_time = {};

// HH:MM:SS timer
function HMStimer_core(seconds) {

		// hours
		media_time.HH = Math.floor( seconds/3600 );
		// leading zero
		if ( seconds < 36000 ) media_time.HH = "0" + media_time.HH;

		// minutes
		media_time.MM = Math.floor( seconds/60%60 );
		// leading zero
		if ( seconds%3600 < 600 ) media_time.MM = "0" + media_time.MM;

		// seconds
		media_time.SS = Math.floor( seconds%60 );
		// leading zero
		if ( seconds%60 < 10 ) media_time.SS = "0" + media_time.SS;

	return media_time.HH+":"+media_time.MM+":"+media_time.SS;
}

function HMStimer(seconds) {
	if (seconds >= 0) return HMStimer_core(seconds); // zero or positive
	if (seconds < 0) // negative
		{ 
		 seconds = seconds * (-1);
		 return "-"+HMStimer_core(seconds);
		}
	if (seconds == undefined || isNaN(seconds) ) return "–&thinsp;–:–&thinsp;–:–&thinsp;–";

}

// MM:SS timer
function MStimer_core(seconds) {

		// minutes
		media_time.MM = Math.floor( seconds/60 );
		// leading zero
		if ( seconds%3600 < 600 ) media_time.MM = "0" + media_time.MM;

		// seconds
		media_time.SS = Math.floor( seconds%60 );
		// leading zero
		if ( seconds%60 < 10 ) media_time.SS = "0" + media_time.SS;

	return media_time.MM+":"+media_time.SS;
}

function MStimer(seconds) {
	if (seconds >= 0) return MStimer_core(seconds); // zero or positive
	if (seconds < 0) // negative
		{ 
		 seconds = seconds * (-1);
		 return "-"+MStimer_core(seconds);
		}
	if (seconds == undefined || isNaN(seconds) ) return "–&thinsp;–:–&thinsp;–";

}


// implements togglePlay(); – deprecated due to compatibility issues on YouTube (broken site) and Dailymotion ("not a function" error through iframe'd player).
/*
Object.prototype.togglePlay = function togglePlay() {
  return this.paused ? this.play() : this.pause();
};
*/

// new function without object prototype for compatibility
function togglePlay(media_element) {
	if (media_element) { // validate media element first to avoid errors
		media_element.paused ? media_element.play() : media_element.pause();
	}
}

// media file extension list
var mediafileext = {
	"video":[".mp4",".mpg",".mpeg",".mts",".mt2s",".m4v",".ts",".ogv",".wmv",".3gp",".3gpp"],
	"audio":[".mp3",".wma",".wav",".ogg",".opus",".flac",".oga",".wma",".aac",".amr",".alac",".m4a"]
};

// == Main code ==
if (! timerUI) var timerUI = new Object({}); // create parent object if none exists

	// default system variables
timerUI.debug_mode = false;
timerUI.override_check = false;

timerUI.on = true;
timerUI.buffer_on = true;
timerUI.multiBuffer = true; // multiple buffer segments
timerUI.div = {}; // unset yet, declaring to prevent reference errors
timerUI.interval = {};
timerUI.show_remaining = 0; // 0: show elapsed time. 1: show remaining time. 2: show elapsed and total.
timerUI.update_during_seek = true; // update timer while dragging seek bar
timerUI.color = "rgb(49,136,255)"; // #38F – using RGB for compatibility.
timerUI.gradient = "rgba(0,0,0,0.9)"; // using RGBA instead of hexadecimal for compatibility.
timerUI.font_pack = "din,futura,'noto sans',ubuntu,'segoe ui',verdana,tahoma,roboto,'roboto light',arial,helvetica,'trebuchet ms',sans-serif,consolas,monospace";
timerUI.width_breakpoint = 768; // pixels

	// console notifications and warnings (possibly to be expanded)
timerUI.msg = {
	"notimer": "timerUI: No timer found; checking for media element again. Please try again.",
	"nomedia": "timerUI: no media element found on page. Stopping."
};

	// text containers (no const for compatibility)
var timer_linefeed = "<span class=timer_linefeed><br /></span>";
var timer_slash = " <span class=timer_slash>/</span> ";

	// functions
timerUI.toggle = {};
timerUI.toggle.main = function() {
	// show and hide
	if (timerUI.div) {
		timerUI.update();
		if (timerUI.on) {  
			timerUI.div.style.display = "none";
			console.log("timerUI off");
		}
		if (! timerUI.on ) {  
			timerUI.div.style.display = "block";
			console.log("timerUI on");
		}
		timerUI.on ? timerUI.on = false : timerUI.on = true;
	} else {
		console.warn(timerUI.msg.notimer);
		timeUI();
	}
};

timerUI.toggle.buffer = function() {
	if (timerUI.div) {
		timerUI.update(); timerUI.updateBufferBar(true);
		if (timerUI.buffer_on) {  
			timerUI.buffer_bar.style.display = "none";
			console.log("timerUI buffer bar off");
		}
		if (! timerUI.buffer_on ) {  
			timerUI.buffer_bar.style.display = "block";
			console.log("timerUI buffer bar on");
		}
		timerUI.buffer_on ? timerUI.buffer_on = false : timerUI.buffer_on = true;
	} else {
		console.warn(timerUI.msg.notimer);
		timeUI();
	}
};

timerUI.toggle.title = function() {
	if (timerUI.div) {
		timerUI.update(); timerUI.updateBufferBar(true);
		if (timerUI.title_on) {  
			timerUI.title.style.display = "none";
			console.log("timerUI title off");
		}
		if (! timerUI.title_on ) {  
			timerUI.title.style.display = "block";
			console.log("timerUI title on");
		}
		timerUI.title_on ? timerUI.title_on = false : timerUI.title_on = true;
	} else {
		console.warn(timerUI.msg.notimer);
		timeUI();
	}
};

timerUI.getTitle = function() { 
		timerUI.domainRules();
	if (customTitleElement) timerUI.newTitle = customTitleElement.innerHTML;
	else { // skipping this whole part if no custom title is specified
		timerUI.newTitle = document.title;
		timerUI.titleDomainRules();
	}
	if (media_element) {
		timerUI.updateFileIcon();
		return timerUI.fileIcon+"&nbsp;"+timerUI.newTitle;
	} else {
		return "TimerUI – designed for home cinemas";
	}
};

timerUI.guessMediaType = function() { 
	if (isDomain("youtube.com") || isDomain("dailymotion.com") ) return "video";
	if (document.location.pathname.search(/^\/video\//) > -1) return "video";
	if (checkFileExtension(mediafileext.video) ) return "video";
	if (checkFileExtension(mediafileext.audio) ) return "audio";
	return "unknown"; // if nothing detected
};

timerUI.updateFileIcon = function() {
	timerUI.fileIcon = timerUI.guessMediaType();
	switch(timerUI.fileIcon) {
		case "video": timerUI.fileIcon = "🎞️"; break;
		case "audio": timerUI.fileIcon = "♫"; break;
		case "unknown": timerUI.fileIcon = "📄"; break;
	}
};


timerUI.adaptTitleWidth = function() {
	if (media_element.duration > 3600 && timerUI.show_remaining == 2 && window.innerWidth > timerUI.width_breakpoint) 
		timerUI.title.style.maxWidth = "calc(100% - 670px)";
	else
		timerUI.title.style.maxWidth = "calc(100% - 400px)";
};

window.addEventListener('resize', function() { 
	if (window.innerWidth < timerUI.width_breakpoint) timerUI.title.removeAttribute("style");
} );

timerUI.update = function() {
	if (media_element) {
		timerUI.bar.style.width=media_element.currentTime / media_element.duration * 100 + "%";

		// buffer bar update formerly located here; removed from the scope of this function

		switch(timerUI.show_remaining) {
			// 0: "HH:MM:SS"  1: "-HH:MM:SS"  2: "MM:SS / MM:SS" or "HH:MM:SS / HH:MM:SS"
			case 0: timerUI.time.innerHTML=HMStimer(media_element.currentTime); break;
			case 1: timerUI.time.innerHTML=HMStimer(media_element.currentTime-media_element.duration); break;
			case 2: 
				if (media_element.duration < 3600 || isNaN(media_element.duration) ) {
				// show hours if duration exceeds one hour
					timerUI.time.innerHTML=
						MStimer(media_element.currentTime)
						+ timer_linefeed
						+ timer_slash
						+ MStimer(media_element.duration);
				} else {
					timerUI.time.innerHTML=
						HMStimer(media_element.currentTime)
						+ timer_linefeed
						+ timer_slash
						+ HMStimer(media_element.duration);
				}
				break;
		}

		media_element.paused == false ? 
			timerUI.status.innerHTML=symbol_play
		  : timerUI.status.innerHTML=symbol_pause;

  } else { timerUI.stop(); console.warn(timerUI.msg.nomedia); }
};
timerUI.updateTitle = function() { if (timerUI.title) timerUI.title.innerHTML = timerUI.getTitle(); };

// update title on URL change
addEventListener('popstate', timerUI.updateTitle);

// update title fallback
timerUI.interval.updateTitle = setInterval(timerUI.updateTitle, 2000);


// buffer bar
timerUI.updateBufferBar = function(override_paused) {
	if (media_element && timerUI.buffer_on && (!media_element.paused || override_paused) ) {
	timerUI.multiBuffer ? timerUI.update_multi_buffer() : timerUI.single_segment_buffer();
  }
};

// single-segment buffer bar
timerUI.single_segment_buffer = function() {
	if (timerUI.buffer_bar.innerHTML!="") { timerUI.buffer_bar.style=""; timerUI.buffer_bar.innerHTML=""; } // reset after switching from multi-segment buffer bar
	// find out first buffer segment after current playback position
	media_element.buffered.length > 0 ? timerUI.buffer_segment=media_element.buffered.length-1 : timerUI.buffer_segment=0;
	// media_element.buffered.length is zero until player is initialized
	// prevent timerUI.buffer_segment from going negative, as it would cause a DOMException error
	if  ( timerUI.buffer_segment > 0) {
		while (media_element.buffered.end(timerUI.buffer_segment-1) > media_element.currentTime && timerUI.buffer_segment > 1 ) {
			timerUI.update_single_buffer();
			timerUI.buffer_segment-- ;
		}
	}
};

timerUI.update_single_buffer = function() {
	if (media_element.buffered.length > 0) {
	// prevent "DOMException: Index or size is negative or greater than the allowed amount"
		timerUI.buffer_bar.style.width=media_element.buffered.end(timerUI.buffer_segment) / media_element.duration * 100 + "%";
	} else { timerUI.buffer_bar.style.width="0%"; }
};

// multi-segment buffer bar – highlight all buffered parts
timerUI.update_multi_buffer = function() {
	if (timerUI.buffer_bar.style.length < 1) {
		timerUI.buffer_bar.style.width="100%";
		timerUI.buffer_bar.style.backgroundColor="rgba(0,0,0,0)";
	}
	if (media_element.buffered.length > 0) {
		timerUI.generate_buffer_segments();
	} else { timerUI.buffer_bar.style.width="0%"; }
};

timerUI.generate_buffer_segments = function() {
	timerUI.buffer_bar.innerHTML=""; // reset to re-generate segments
	for (count=0; count < media_element.buffered.length; count++) {
		timerUI.append_buffer_segment(timerUI.get_buffer_range(count) );
	}
	timerUI.select_segments = timerUI.buffer_bar.getElementsByClassName("timerUI_buffer_segment");
	timerUI.segment_count = timerUI.select_segments.length;
};

timerUI.append_buffer_segment = function(start_pos,end_pos) {
	if (!start_pos) start_pos=timerUI.get_buffer_range(segment_number).start_pos;
	if (!end_pos) end_pos=timerUI.get_buffer_range(segment_number).end_pos;
	timerUI.buffer_bar.appendChild(document.createElement("div") );
	timerUI.buffer_bar.lastElementChild.classList.add("timerUI_buffer_segment");
	timerUI.buffer_bar.lastElementChild.style="left:"+start_pos+"%;width:"+(end_pos-start_pos)+"%;background-color:"+timerUI.color+";";
};

timerUI.get_buffer_range = function(segment_number) {
	return { 
	start_pos: media_element.buffered.start(segment_number) / media_element.duration * 100,
	end_pos: media_element.buffered.end(segment_number) / media_element.duration * 100 
	}; // object with start and end percentages
};

timerUI.set_buffer_segment = function(segment_number,start_pos,end_pos) {
	var selection=timerUI.buffer_bar.getElementsByClassName("timerUI_buffer_segment");
	selection[segment_number].style.left = start_pos / media_element.duration * 100 + "%";
	selection[segment_number].style.width = (end_pos-start_pos) / media_element.duration * 100 + "%";
};



// colors
timerUI.setColor = function(newColor) {
	newColor == "default" ? timerUI.color="rgb(49,136,255)" /* #38F */ : timerUI.color = newColor;

	timerUI.bar.style.backgroundColor=timerUI.color;
	timerUI.buffer_bar.style.backgroundColor=timerUI.color;
	timerUI.bar.style.boxShadow="0 0 30px 0 "+timerUI.color;
	// (deprecated due to new buffer bar) timerUI.bar_placeholder.style.backgroundColor=timerUI.color;
	timerUI.time.style.color=timerUI.color;
	timerUI.status.style.color=timerUI.color;
	timerUI.title.style.color=timerUI.color;
};

timerUI.setGradient = function(newGradient) {
	newGradient == "default" ? timerUI.gradient="rgba(0,0,0,0.9)" : timerUI.gradient = newGradient;
	timerUI.gradient_placeholder.style.backgroundImage="linear-gradient(to top,"+timerUI.gradient+", rgba(0,0,0,0) )";
};

timerUI.setFont = function(newFont) {
	timerUI.time.style.fontFamily=newFont;
	timerUI.title.style.fontFamily=newFont;
};

timerUI.stop = function() {
	timerUI.status.innerHTML="■";
	timerUI.bar.style.width=0;
	timerUI.buffer_bar.style.width=0;
	timerUI.time.innerHTML=HMStimer(undefined);
};

// Additional checks to ensure the player is detected
window.onclick = function() { checkMediaType();timeUI(); };
window.addEventListener("keydown", function() { checkMediaType();timeUI(); } );


function timeUI() {
// slightly different name to prevent naming collision with timerUI object

	checkMediaType();
	timerUI.domainRules(); // load domain rules
	// add timerUI if it does not already exist
	if ( ( ! document.getElementById("timerUI") ) && playerExists || timerUI.override_check ) {

	// Adding elements

		// parent element
		appendChildWithID("div","timerUI");
		timerUI.div = document.getElementById("timerUI");

		// button styling
		addStyle("#timerUI button { background:none; border:none; outline:none; line-height:unset; }  #timerUI button:hover { filter: brightness(1.2); }    #timerUI button:active  { filter: brightness(0.6); }", timerUI.div);
			// to suppress button background and border on earlier browser versions
		timerUI.div.lastElementChild.classList.add("timerUI_buttons"); // label to improve visibility in page inspector

		// background gradient
		appendChildWithID("div","timerUI_bottom_gradient",timerUI.div );
		timerUI.gradient_placeholder = document.getElementById("timerUI_bottom_gradient");
		addStyle("#timerUI #timerUI_bottom_gradient { display:block; position:fixed; background-image:linear-gradient(to top,"+timerUI.gradient+", rgba(0,0,0,0) ); opacity:1; height:80pt; width:100%; bottom:0; pointer-events:none; }", timerUI.div);

		// progress bar
		appendChildWithID("div","timerUI_progress_bar",timerUI.div );
		timerUI.bar = document.getElementById("timerUI_progress_bar");
		addStyle("#timerUI #timerUI_progress_bar { display:block; position:fixed; background-color:"+timerUI.color+"; box-shadow: 0 0 30px 0px "+timerUI.color+"; height:8pt; width:50%; bottom:0; }", timerUI.div);

		// buffer bar
		appendChildWithID("div","timerUI_buffer_bar",timerUI.div );
		timerUI.buffer_bar = document.getElementById("timerUI_buffer_bar");
		addStyle("#timerUI #timerUI_buffer_bar, #timerUI .timerUI_buffer_segment { display:block; position:fixed; background-color:"+timerUI.color+"; height:8pt; width:75%; bottom:0; opacity:0.4; } #timerUI .timerUI_buffer_segment { opacity:1; }", timerUI.div);

		// media title
		appendChildWithID("div","timerUI_media_title",timerUI.div );
		timerUI.title = document.getElementById("timerUI_media_title");
		timerUI.title.innerHTML = timerUI.getTitle();
		addStyle("#timerUI #timerUI_media_title { position:fixed; text-shadow: 0 0 5px black; display:inline; display:-webkit-box; bottom:15pt; left:2pt; color:"+timerUI.color+"; font-family:"+timerUI.font_pack+"; font-size:20pt; width:60%; max-width:calc(100% - 500px); text-overflow: ellipsis;     overflow: hidden;   -webkit-box-orient: vertical; -webkit-line-clamp: 2; vertical-align: bottom;");

		// timer
		appendChildWithID("button","timerUI_media_timer",timerUI.div );
		timerUI.time = document.getElementById("timerUI_media_timer");
		timerUI.time.innerHTML="00:00:00";
		addStyle("#timerUI #timerUI_media_timer { display:block; color:"+timerUI.color+"; position:fixed; cursor:pointer; font-size:50pt; text-shadow: 0 0 20px black; line-height:60pt; bottom:10pt; right:30pt; text-align:right; font-weight:400; font-family:"+timerUI.font_pack+"; }  #timerUI #timerUI_media_timer .timer_linefeed { display:none; }", timerUI.div);

		// play/pause symbol
		appendChildWithID("button","timerUI_playback_status",timerUI.div );
		timerUI.status = document.getElementById("timerUI_playback_status");
		timerUI.status.innerHTML="■";
		addStyle("#timerUI #timerUI_playback_status { display:block; position:fixed; cursor:pointer; color:"+timerUI.color+"; font-size:24pt; line-height:40pt; bottom:30pt; right:3pt; font-family:none; }", timerUI.div);

		// progress bar placeholder – put last to be at the top in stacking context
		appendChildWithID("div","timerUI_progress_placeholder",timerUI.div );
		timerUI.bar_placeholder = document.getElementById("timerUI_progress_placeholder");
		addStyle("#timerUI #timerUI_progress_placeholder { display:block; position:fixed; cursor:pointer; background-color:grey; height:8pt; width:100%; bottom:0; opacity:0.2; }", timerUI.div);

		// responsive - at bottom to be able to override CSS properties without !important flag.
		addStyle("@media (max-width:"+timerUI.width_breakpoint+"px) { #timerUI #timerUI_media_timer { font-size:30pt; line-height:24pt; bottom:15pt; } #timerUI #timerUI_playback_status { bottom:10pt; } } @media (max-width:500px) { #timerUI #timerUI_media_timer .timer_linefeed { display:inline; } #timerUI #timerUI_media_timer .timer_slash { display:none; } } @media (max-width:"+timerUI.width_breakpoint+"px) { #timerUI #timerUI_buffer_bar { font-size:10pt; -webkit-line-clamp: 3; max-width:60%;} } @media (max-width:480px) { #timerUI #timerUI_buffer_bar { display: none; } } ", timerUI.div);
		timerUI.div.lastElementChild.classList.add("timerUI_responsive");


	// update timer during playback every fifteenth of a second and while mouse is dragging progress bar
	timerUI.interval.update = setInterval(
		function() { if ( 
				( media_element /* exists? */ && timerUI.update_during_seek && mousedown_status )
			 || ( media_element && timerUI.on && ! media_element.paused ) 
    ) timerUI.update(); }, 1000/15
	);

	// Longer interval for buffer bar to minimize CPU usage
	timerUI.interval.buffer = setInterval(timerUI.updateBufferBar, 1000);


	// play and pause toggle
	timerUI.status.onclick = function() { togglePlay(media_element); timerUI.update(); timerUI.updateBufferBar(true); };
		// former code with object prototype caused compatibility issues on various sites: media_element.togglePlay();

	// toggle between elapsed, remaining, and elapsed/total time
	timerUI.time.onclick = function() { 
		switch(timerUI.show_remaining) {
			case 0: timerUI.show_remaining = 1; break;
			case 1: timerUI.show_remaining = 2; timerUI.adaptTitleWidth(); break;
			case 2: timerUI.show_remaining = 0; timerUI.adaptTitleWidth(); break;
		}
		timerUI.update(); timerUI.updateBufferBar(true);
	};

	// clickable progress bar (experimental) - no "timerUI." notation because inside main function
	timerUI.clickSeekBar = function(m){
		if (media_element) {
			var clickPos = m.clientX / timerUI.bar_placeholder.offsetWidth;
			// go to beginning if clicked in first percentile
			if (clickPos < 0.01 ) media_element.currentTime = 0;
				else media_element.currentTime = media_element.duration * clickPos;
			timerUI.update(); timerUI.updateBufferBar(true);
		}
	};
	function dragSeekBar(m){ // currently unused
		m = m || window.event;
		var clickPos = m.pageX / timerUI.bar_placeholder.offsetWidth;
		var dragSeekBarInterval = setInterval( function() {
			media_element.currentTime = media_element.duration * clickPos;
			timerUI.update();
			if (! mousedown_status) { clearInterval(dragSeekBarInterval); return; }
		}, 200);
	}
	timerUI.bar_placeholder.addEventListener("mousedown", timerUI.clickSeekBar );
	// (incomplete) timerUI.bar_placeholder.addEventListener("mousemove", dragSeekBar );
	// (obsolete) timerUI.bar_placeholder.addEventListener("mouseup", clickSeekBar );

	timerUI.update();

	// == Patches ==

		// prevent missing out on pausing from inside a site's existing player
		window.addEventListener("mouseup", function() { setTimeout(timerUI.update, 200); } );
		window.addEventListener("keyup", function() { setTimeout(timerUI.update, 200); } );

		// prevent detaching from player on sites with playlists such as Internet Archive
		timerUI.interval.checkMedia = setInterval( checkMediaType,1000 );

		// prevent indicating "▶" after playback finished
		timerUI.interval.checkPaused = setInterval( function() {
				if ( media_element /* exists? */ && media_element.paused && ! timerUI.pause_checked) {
					timerUI.update(); timerUI.pause_checked = true;
					if (timerUI.debug_mode) console.debug("timerUI: checking paused status: "+media_element.paused);
				} else if ( media_element && ! media_element.paused ) { timerUI.pause_checked = false; }
				// to avoid redundant checks while paused
		},1000 );

	} else {
	// warn in console that no player exists; prevent repetition
		if (! playerExists && ! timerUI.noMediaWarned) {
				console.warn(timerUI.msg.nomedia); timerUI.noMediaWarned = true;
		}
	}
}

// == Custom domain rules ==
timerUI.domainRules = function() {
	if (isDomain("dailymotion.com") && document.location.pathname.search(/^\/embed\//) < 0 ) {
		// Dailymotion watch page, excluding embed page.
		customMediaElement(document.getElementById("player-body").contentWindow.document.getElementsByTagName("video")[0]);
		customTitleElement = document.getElementById("media-title"); // for unlisted
	}
};

timerUI.titleDomainRules = function() {
// custom domain rules for title
		if ( isDomain("youtube.com") || isDomain("dailymotion.com")
			|| isDomain("wikimedia.org") || isDomain("wikipedia.org")
			|| isDomain("wikiversity.org") || isDomain("wikibooks.org")
			|| isDomain("mediawiki.org")
			) {
			// negative lookahead regular expression – trim after last dash
			// Match both normal dash "-" and ndash "–", since the German-language wikis use the latter.
			timerUI.newTitle = decodeURI(timerUI.newTitle.substring(0,timerUI.newTitle.search(/(-|–)(?:.(?!(-|–)))+$/)-1 ) );
		}
		// remove "File:" prefix on wikis
		if ( isDomain("wiki") ) {
			if (document.title.search(/^File:/)  == 0 ) timerUI.newTitle = timerUI.newTitle.substring(5);
			if (document.title.search(/^Datei:/) == 0 ) timerUI.newTitle = timerUI.newTitle.substring(6);
		}

		if ( isDomain("archive.org") && ! isDomain("web.archive.org") ) {
			timerUI.newTitle = (document.location.href+"").substring((document.location.href+" ").search(/\/(?:.(?!\/))+\/?$/)+1 );
			// after last slash (additional space prevents full URL from being matched)
			if (timerUI.newTitle != "") { timerUI.newTitle += " - "; }
			timerUI.newTitle += document.title.substring(0,document.title.search(/:(?:.(?!:))+(?:.(?!:))+/)-1 );
			// trim after second-last colon, -1 to remove space at end

			decodeURI(timerUI.newTitle); // prevent spaces from turning into "%20".
		}
};

// == Master function ==
timeUI();