convertSpeedUnit

将网速单位从bit转换为Byte
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// ==UserScript==
// @name         convertSpeedUnit
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  将网速单位从bit转换为Byte
// @author       ExcuseLme
// @namespace    https://github.com/ExcuseLme
// @match        *://fast.com/*
// @icon         https://fast.com/assets/new-logo-vert-37861c.svg
// @grant        none
// @run-at       document-start
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';

    const CONFIG = {
        targets: [
            { id: 'speed-value', type: 'value' },
            { id: 'speed-units', type: 'unit' },
            { id: 'upload-value', type: 'value' },
            { id: 'upload-units', type: 'unit' }
        ]
    };

    /**
     * 核心转换逻辑
     */
    function convertValue(raw) {
        let val = parseFloat(raw) / 8;
        if (isNaN(val)) return raw;
        // 遵循原站 Math.round 步进逻辑
        if (val < 9.95) return (Math.round(10 * val) / 10).toFixed(1);
        if (val < 100) return Math.round(val).toString();
        return (10 * Math.round(val / 10)).toString();
    }

    function convertUnit(raw) {
        return raw.replace('Kbps', 'KB/s')
                  .replace('Mbps', 'MB/s')
                  .replace('Gbps', 'GB/s');
    }

    /**
     * 同步并输出审计日志
     */
    function sync(target, original, shadow) {
        const rawText = original.innerText.trim();
        if (!rawText) return;

        let convertedText = (target.type === 'value') ? convertValue(rawText) : convertUnit(rawText);

        if (shadow.innerText !== convertedText) {
            shadow.innerText = convertedText;

            // 日志审计逻辑：仅在数值更新时输出完整链路，避免单位更新时重复输出
            if (target.type === 'value') {
                const isUpload = target.id.includes('upload');
                const unitId = isUpload ? 'upload-units' : 'speed-units';
                const rawUnit = document.getElementById(unitId)?.innerText.trim() || '';
                const convUnit = convertUnit(rawUnit);

                console.log(`%c[speedConvertScript] %c${rawText}${rawUnit} %c-> %c${convertedText}${convUnit}`,
                    "color: #00ADED; font-weight: bold;",
                    "color: #ff4757;",
                    "color: #2f3542;",
                    "color: #2ed573; font-weight: bold;");
            }
        }
    }

    /**
     * 初始化与 DOM 挂载
     */
    function processElement(target) {
        const original = document.getElementById(target.id);
        if (!original || original.dataset.hasShadow) return;

        const shadow = document.createElement(original.tagName);
        shadow.id = `shadow-${target.id}`;
        shadow.className = original.className;

        // 隐藏原件
        original.style.setProperty('display', 'none', 'important');
        original.parentNode.insertBefore(shadow, original);
        original.dataset.hasShadow = 'true';

        // 监听变动
        const observer = new MutationObserver(() => sync(target, original, shadow));
        observer.observe(original, { characterData: true, childList: true, subtree: true });

        // 初始同步
        sync(target, original, shadow);
    }

    // 全局 DOM 守卫
    const mainObserver = new MutationObserver(() => CONFIG.targets.forEach(processElement));

    const init = () => {
        if (document.body) {
            mainObserver.observe(document.body, { childList: true, subtree: true });
            CONFIG.targets.forEach(processElement);
        } else {
            setTimeout(init, 50);
        }
    };

    init();
})();