// ==UserScript==
// @name               ACT.YouTube.DM.PiP-button
// @name:zh-CN         ACT.YouTube.DM.画中画按钮
// @description        Add a PiP button to the player to easy enter Picture-in-Picture mode.
// @description:zh-CN  为播放器添加画中画按钮，轻松进入画中画模式。
// @author             ACTCD
// @version            20221105.1
// @license            GPL-3.0-or-later
// @namespace          ACTCD/Userscripts
// @supportURL         https://github.com/ACTCD/Userscripts
// @homepageURL        https://github.com/ACTCD/Userscripts
// @match              *://*.youtube.com/*
// @grant              none
// @inject-into        content
// @run-at             document-start
// @downloadURL https://update.greasyfork.icu/scripts/441866/ACTYouTubeDMPiP-button.user.js
// @updateURL https://update.greasyfork.icu/scripts/441866/ACTYouTubeDMPiP-button.meta.js
// ==/UserScript==

(function () {
	"use strict";

	if (!document.pictureInPictureEnabled) {
		console.log("Your browser cannot use picture-in-picture right now");
		return;
	}

	// Create PiP Button
	const pip_button = document.createElement("button");
	pip_button.title = "Picture-in-Picture";
	const svg = document.createElement("svg");
	svg.setAttribute("width", "100%");
	svg.setAttribute("height", "100%");
	svg.setAttribute("viewBox", "-8 -6 36 36");
	const path = document.createElement("path");
	const path1 =
		"M2.5,17A1.5,1.5,0,0,1,1,15.5v-9A1.5,1.5,0,0,1,2.5,5h13A1.5,1.5,0,0,1,17,6.5V10h1V6.5A2.5,2.5,0,0,0,15.5,4H2.5A2.5,2.5,0,0,0,0,6.5v9A2.5,2.5,0,0,0,2.5,18H7V17Z M18.5,11h-8A2.5,2.5,0,0,0,8,13.5v5A2.5,2.5,0,0,0,10.5,21h8A2.5,2.5,0,0,0,21,18.5v-5A2.5,2.5,0,0,0,18.5,11Z";
	const path2 =
		"M18.5,11H18v1h.5A1.5,1.5,0,0,1,20,13.5v5A1.5,1.5,0,0,1,18.5,20h-8A1.5,1.5,0,0,1,9,18.5V18H8v.5A2.5,2.5,0,0,0,10.5,21h8A2.5,2.5,0,0,0,21,18.5v-5A2.5,2.5,0,0,0,18.5,11Z M14.5,4H2.5A2.5,2.5,0,0,0,0,6.5v8A2.5,2.5,0,0,0,2.5,17h12A2.5,2.5,0,0,0,17,14.5v-8A2.5,2.5,0,0,0,14.5,4Z";
	path.setAttribute("fill", "#fff");
	svg.append(path);
	if (location.hostname == "m.youtube.com") {
		pip_button.style.setProperty("position", "absolute");
		pip_button.style.setProperty("z-index", "100");
		pip_button.style.setProperty("top", "0px");
		pip_button.style.setProperty("left", "4px");
		svg.setAttribute("width", "42px");
	} else {
		pip_button.className = "ytp-button";
		path.id = "ACT_PiP_Path";
		const use = document.createElement("use");
		use.className = "ytp-svg-shadow";
		use.setAttribute("href", "#" + path.id);
		path.before(use);
	}
	pip_button.addEventListener(
		"click",
		(event) => {
			const video = document.querySelector("video[src]");
			if (!video) return;
			if (video.webkitPresentationMode === undefined) {
				if (document.pictureInPictureElement) {
					document.exitPictureInPicture();
				} else {
					video.requestPictureInPicture();
				}
			} else {
				if (video.webkitPresentationMode != "inline") {
					video.webkitSetPresentationMode("inline");
				} else {
					video.webkitSetPresentationMode("picture-in-picture");
				}
			}
			event.preventDefault();
			event.stopImmediatePropagation();
		},
		true,
	);
	const pip_button_act = (pathx) => {
		path.setAttribute("d", pathx);
		pip_button.innerHTML = svg.outerHTML;
	};
	pip_button_act(path1);

	// Insert PiP Button (desktop) // Fixed once for unreliable @run-at document-start
	document.querySelector(".ytp-miniplayer-button")?.before(pip_button);

	// Video element initialization
	const enterpictureinpicture = (e) => pip_button_act(path2);
	const leavepictureinpicture = (e) => pip_button_act(path1);
	const webkitpresentationmodechanged = (event) => {
		event.target.webkitPresentationMode == "picture-in-picture"
			? (pip_button_act(path2), event.stopImmediatePropagation())
			: pip_button_act(path1);
	};
	const pip_init = (video) => {
		if (!video || video.nodeName != "VIDEO" || !video.hasAttribute("src"))
			return;
		if (video.webkitPresentationMode === undefined) {
			video.addEventListener("enterpictureinpicture", enterpictureinpicture);
			video.addEventListener("leavepictureinpicture", leavepictureinpicture);
		} else {
			video.addEventListener(
				"webkitpresentationmodechanged",
				webkitpresentationmodechanged,
				true,
			);
		}
	};
	pip_init(document.querySelector("video[src]"));

	// Dynamic adjustment
	new MutationObserver((mutationList) => {
		mutationList.forEach((mutation) => {
			if (mutation.type == "childList") {
				mutation.addedNodes.forEach((node) => {
					if (node.nodeType != Node.ELEMENT_NODE) return;
					node.nodeName == "VIDEO" && pip_init(node);
					node.classList.contains("ytp-miniplayer-button") &&
						node.before(pip_button); // Insert PiP Button (desktop)
				});
				mutation.removedNodes.forEach((node) => {
					if (node.nodeType != Node.ELEMENT_NODE) return;
					node.classList.contains("ytp-miniplayer-button") &&
						pip_button.remove();
					node.id == "player-control-overlay" && pip_button.remove();
				});
			}
			if (mutation.type == "attributes") {
				mutation.target.nodeName == "VIDEO" &&
					mutation.attributeName == "src" &&
					pip_init(mutation.target);
				if (
					mutation.target.id == "player-control-overlay" &&
					mutation.attributeName == "class"
				) {
					// Insert PiP Button (mobile)
					mutation.target.classList.contains("fadein")
						? document.querySelector("#player")?.append(pip_button)
						: pip_button.remove();
				}
				if (
					mutation.attributeName == "class" &&
					mutation.target ==
						document.querySelector(".player-controls-top")?.parentNode
				) {
					mutation.target.classList.contains("player-controls-hide")
						? pip_button.remove()
						: document
								.querySelector("#player-control-overlay")
								?.classList.contains("fadein") &&
						  document.querySelector("#player")?.append(pip_button);
				}
				if (
					mutation.target.id == "player" &&
					mutation.attributeName == "hidden"
				) {
					mutation.target.hasAttribute("hidden") &&
						(pip_button.remove(), document.exitPictureInPicture());
				}
			}
		});
	}).observe(document, { subtree: true, childList: true, attributes: true });
})();