// ==UserScript==
// @name        Weverse Video Rotation
// @description Adds buttons and keyboard shortcuts to rotate and flip the video on Weverse.io
// @version     1
// @author      Slooshi
// @namespace   Slooshi
// @match       https://weverse.io/*
// @license     MIT
// @grant       GM_addStyle
// @downloadURL https://update.greasyfork.icu/scripts/527066/Weverse%20Video%20Rotation.user.js
// @updateURL https://update.greasyfork.icu/scripts/527066/Weverse%20Video%20Rotation.meta.js
// ==/UserScript==

GM_addStyle(`
#video-rotation-controls {
	margin-left: 15px;
}
#video-rotation-controls button {
	font-size: 20px;
	background: #f5f5f5;
	border: 1px solid #d9d9d9;
	color: #414141;
	line-height: 22px;
	height: 24px;
	width: 24px;
	outline: 0;
}
#video-rotation-controls button:not(:last-child) {
	margin-right: 3px;
}
.vwplayer_vlivelive .videoBox {
    height: calc(100% - 4px);
    width: calc(100% - 4px);
}
`);

let directions = {
	left: 'r270',
	up: 'r0',
	right: 'r90',
	down: 'r180',
	flipH: 'flipH',
	flipV: 'flipV',
}
let rotations = {
	r90: 'rotate(90deg)',
	r180: 'rotate(180deg)',
	r270: 'rotate(270deg)',
};
let scaling = {
	flipH: 'scaleX(-1)',
	flipV: 'scaleY(-1)',
	portrait: 'scale(1.77777)',
	landscape: 'scale(0.5625)',
};

let attempts = 0;
let controlsID = 'video-rotation-controls';
let shortcutsEnabled = true;
let shortcuts = {
	'Numpad8': directions.up,
	'Numpad2': directions.down,
	'Numpad4': directions.left,
	'Numpad6': directions.right,
	'Numpad9': directions.flipH,
	'Numpad3': directions.flipV,
}
let stylesheet = null;
let timer = null;

(() => {
	stylesheet = document.createElement('style');
	document.head.appendChild(stylesheet);

	let getAllSubsets = arr => arr.reduce((subsets, value) => subsets.concat(subsets.map(set => [...set, value])), [[]]).slice(1);
	let scalings = getAllSubsets(Object.keys(scaling));

	for (let rule in rotations) {
		stylesheet.sheet.insertRule(`video.${rule} { transform: ${rotations[rule]}; }`, stylesheet.sheet.cssRules.length);
		for (let scalingSet of scalings) {
			stylesheet.sheet.insertRule(`video.${rule}.${scalingSet.reduce((s, v) => s+'.'+v)} { transform: ${rotations[rule] + scalingSet.reduce((s, v) => s+' '+scaling[v], '')}; }`, stylesheet.sheet.cssRules.length);
		}
	}

	let flips = getAllSubsets([directions.flipH, directions.flipV]);
	for (let flipSet of flips) {
		stylesheet.sheet.insertRule(`video.${flipSet.reduce((s, v) => s+'.'+v)} { transform:${flipSet.reduce((s, v) => s+' '+scaling[v], '')}; }`, stylesheet.sheet.cssRules.length);
	}

	addButtons();

	// Re-add buttons if page changes
	window.history.pushState = function() {
		History.prototype.pushState.apply(history, arguments);
		attempts = 0;
		setTimeout(addButtons, 2000);
	}
})();

function addButtons() {
    clearTimeout(timer);
    let btnArea = document.querySelector('.TitleView_title__SSnHb');

    if (!btnArea) {
        if (++attempts < 10) {
            timer = setTimeout(addButtons, 500);
        }
        return;
    }
    else if (document.getElementById(controlsID)) {
        return;
    }

    let btnDirections = [
        [directions.left, '🠘'],
        [directions.up, '🠙'],
        [directions.right, '🠚'],
        [directions.down, '🠛'],
        [directions.flipV, '🡙'],
        [directions.flipH, '🡘'],
    ];

    let div = document.createElement('div');
    div.id = controlsID;
    div.style.marginLeft = '15px';
    div.style.display = 'inline-block';
    for (let entry of btnDirections) {
        let btn = document.createElement('button');
        btn.dataset.direction = entry[0];
        btn.textContent = entry[1];
        btn.style.fontSize = '20px';
        btn.style.background = '#f5f5f5';
        btn.style.border = '1px solid #d9d9d9';
        btn.style.color = '#414141';
        btn.style.lineHeight = '22px';
        btn.style.height = '24px';
        btn.style.width = '24px';
        btn.style.outline = '0';
        btn.style.marginRight = '3px';
        div.appendChild(btn);
    }

    btnArea.parentNode.insertBefore(div, btnArea.nextSibling);
}

function rotateVideo(direction) {
	let video = document.querySelector('video.webplayer-internal-video');
	if (!video) return;
	let flip = [directions.flipH, directions.flipV].includes(direction);

	if (flip) {
		video.classList.toggle(direction);
	}
	else {
		video.classList.remove(directions.left, directions.right, directions.down, 'portrait', 'landscape');
		if (direction != directions.up) {
			video.classList.add(direction);
			if ([directions.left, directions.right].includes(direction)) {
				video.classList.add(video.videoHeight > video.videoWidth ? 'portrait' : 'landscape');
			}
		}
	}
}

window.addEventListener('click', function(e) {
	if (e.target.parentNode.id != controlsID || e.target.tagName.toLowerCase() != 'button') {
		return;
	}
	else if (e.target.dataset.direction) {
		rotateVideo(e.target.dataset.direction);
	}
}, true);

// Shortcuts
window.addEventListener('keydown', function(e) {
	let stopPropagation = false;
	if (shortcuts[e.code] && shortcutsEnabled) {
		rotateVideo(shortcuts[e.code]);
		stopPropagation = true;
	}
	else if (e.code == 'Pause') {
		shortcutsEnabled = !shortcutsEnabled;
		stopPropagation = true;
	}

	if (stopPropagation) {
		e.preventDefault();
		e.stopPropagation();
	}
}, true);