// ==UserScript==
// @name         Twitch & Kick Latency
// @namespace    latency
// @version      1.3
// @description  Displays the Twitch and Kick play latency
// @author       frz
// @match        https://www.twitch.tv/*
// @match        https://kick.com/*
// @icon         https://www.allkeyshop.com/blog/wp-content/uploads/Twitch-vs-Kick_featured.png
// @grant        none
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';

    let header = null;
    const platform = location.hostname.includes('kick.com') ? 'kick' : 'twitch';

    function styleHeader(el) {
        el.style.display = 'flex';
        el.style.alignItems = 'center';
        el.style.justifyContent = 'center';
        el.style.color = '#FFFFFF';
        el.style.fontWeight = '600';
        el.style.fontSize = '15px';
        el.style.cursor = 'pointer';
        el.style.gap = '6px';
    }

    function createRedDot() {
        const dot = document.createElement('span');
        dot.style.display = 'inline-block';
        dot.style.width = '8px';
        dot.style.height = '8px';
        dot.style.borderRadius = '50%';
        dot.style.backgroundColor = '#FF4B4B';
        dot.id = 'latency-red-dot';
        return dot;
    }

    function getLatency() {
        const video = document.querySelector('video');
        if (!video || !video.buffered || video.buffered.length === 0) return null;
        const latency = video.buffered.end(video.buffered.length - 1) - video.currentTime;
        return latency > 0 ? latency.toFixed(2) : '0.00';
    }

    function updateText() {
        if (!header) return;
        const latency = getLatency();
        if (latency === null) return;

        // Очищаем текст, чтобы убрать "Чат"/"Чат трансляции"
        header.textContent = '';

        let dot = document.getElementById('latency-red-dot');
        if (!dot) {
            dot = createRedDot();
        }
        header.appendChild(dot);

        const textNode = document.createElement('span');
        textNode.className = 'latency-text';
        textNode.textContent = `Latency: ${latency}s`;
        header.appendChild(textNode);
    }

    function createPlatformSpinner() {
        let spinner = document.getElementById('latency-spinner');
        if (!spinner) {
            let spinnerTemplate;
            if (platform === 'twitch') {
                spinnerTemplate = document.querySelector('[data-a-target="tw-loading-spinner"]');
            } else {
                spinnerTemplate = document.querySelector('[data-testid="loading-spinner"]');
            }
            spinner = spinnerTemplate ? spinnerTemplate.cloneNode(true) : document.createElement('div');
            spinner.id = 'latency-spinner';
            spinner.style.position = 'absolute';
            spinner.style.top = '50%';
            spinner.style.left = '50%';
            spinner.style.transform = 'translate(-50%, -50%)';
            spinner.style.zIndex = '9999';
            spinner.style.display = 'none';

            const video = document.querySelector('video');
            if (video && video.parentElement) video.parentElement.appendChild(spinner);
        }
        return spinner;
    }

    function reloadPlayerWithSpinner() {
        const video = document.querySelector('video');
        if (!video) return;

        const spinner = createPlatformSpinner();
        spinner.style.display = 'block';

        const currentTime = video.currentTime;
        video.pause();

        setTimeout(() => {
            try {
                video.currentTime = currentTime;
                video.play().catch(() => {});
            } catch {
                location.reload();
            }
            spinner.style.display = 'none';
        }, 1200);
    }

    function observeHeader() {
        let candidate;
        if (platform === 'twitch') {
            candidate = document.querySelector('#chat-room-header-label');
        } else {
            candidate = Array.from(document.querySelectorAll('span.absolute')).find(
                el => el.textContent.trim() === 'Чат'
            );
        }

        if (candidate && candidate !== header) {
            header = candidate;
            styleHeader(header);
            header.addEventListener('click', reloadPlayerWithSpinner);
            updateText();
        }
    }

    const observer = new MutationObserver(observeHeader);
    observer.observe(document.body, { childList: true, subtree: true });

    setInterval(updateText, 2000);
})();