// ==UserScript==
// @name         Gemini Minimal Scrubber 
// @namespace    https://git.js0ny.net
// @version      1.8.1
// @description  Sidebar navigation with text preview. (Trusted Types Compliant)
// @author       js0ny 
// @match        https://gemini.google.com/*
// @grant        none
// @run-at       document-idle
// @icon         https://www.google.com/s2/favicons?sz=64&domain=gemini.google.com
// ==/UserScript==

(function() {
    'use strict';


    const CONFIG = {
        debounceTime: 500,
        gap: '8px',
        tooltipWidth: '380px',
        hitAreaHeight: '32px',
        baseColor: 'rgba(255, 255, 255, 0.25)', // 浅色模式请改 rgba(0,0,0,0.2)
        hoverColor: '#a8c7fa',
    };

    // 1. 注入 CSS (使用标准 API，避开 CSP 拦截)
    const style = document.createElement('style');
    style.textContent = `
        #gemini-scrubber {
            position: fixed; right: 16px; top: 50%; transform: translateY(-50%);
            display: flex; flex-direction: column; gap: ${CONFIG.gap};
            z-index: 99999; padding: 10px 8px; pointer-events: none;
        }
        .scrub-item {
            position: relative; height: ${CONFIG.hitAreaHeight}; width: 32px;
            display: flex; align-items: center; justify-content: flex-end;
            cursor: pointer; pointer-events: auto;
        }
        .scrub-visual {
            width: 6px; height: 24px; background-color: ${CONFIG.baseColor};
            border-radius: 99px; transition: all 0.2s; box-shadow: 0 2px 5px rgba(0,0,0,0.2);
        }
        .scrub-item:hover .scrub-visual {
            background-color: ${CONFIG.hoverColor}; width: 10px; height: 32px;
            box-shadow: 0 0 10px ${CONFIG.hoverColor};
        }
        .scrub-tooltip {
            position: absolute; right: 36px; top: 50%; transform: translateY(-50%) translateX(10px);
            width: ${CONFIG.tooltipWidth}; background-color: #1e1e1e; border: 1px solid #444;
            border-radius: 12px; padding: 16px; opacity: 0; visibility: hidden;
            pointer-events: none; transition: all 0.2s; color: #e3e3e3; font-size: 14px;
            font-family: sans-serif; z-index: 100000;
        }
        .scrub-item:hover .scrub-tooltip {
            opacity: 1; visibility: visible; transform: translateY(-50%) translateX(0);
        }
        .tooltip-block { margin-bottom: 12px; }
        .tooltip-block:last-child { margin-bottom: 0; }
        .tooltip-label { font-size: 11px; color: #8e918f; font-weight: 700; text-transform: uppercase; margin-bottom: 4px; }
        .tooltip-text { display: -webkit-box; -webkit-line-clamp: 6; -webkit-box-orient: vertical; overflow: hidden; word-wrap: break-word; }
        .tooltip-text.user { color: #d2e3fc; }
    `;
    document.head.appendChild(style);

    let container = null;
    let debounceTimer = null;

    // 辅助函数：安全创建元素 (代替 innerHTML)
    function createEl(tag, className, text) {
        const el = document.createElement(tag);
        if (className) el.className = className;
        if (text) el.textContent = text;
        return el;
    }

    function getCleanText(element) {
        if (!element) return "";
        try {
            const p = element.querySelector("p");
            const raw = (p && p.textContent) ? p.textContent : (element.textContent || "");
            return raw.replace(/\s+/g, ' ').trim();
        } catch (e) {
            return "";
        }
    }

    function createTooltipBlock(labelStr, textStr, isUser) {
        const block = createEl('div', 'tooltip-block');
        const label = createEl('div', 'tooltip-label', labelStr);
        const text = createEl('div', isUser ? 'tooltip-text user' : 'tooltip-text model', textStr);
        block.appendChild(label);
        block.appendChild(text);
        return block;
    }

    function renderScrubber() {
        if (!container) {
            container = document.createElement('div');
            container.id = 'gemini-scrubber';
            document.body.appendChild(container);
        }

        const uNodes = document.querySelectorAll("user-query-content");
        const rNodes = document.querySelectorAll("model-response");

        // 清理多余节点
        while (container.children.length > uNodes.length) {
            container.removeChild(container.lastChild);
        }

        uNodes.forEach((uNode, idx) => {
            const rNode = rNodes[idx];
            const uText = getCleanText(uNode);
            const rText = rNode ? getCleanText(rNode) : "...";

            let item = container.children[idx];

            // 创建新的 Scrub Item
            if (!item) {
                item = createEl('div', 'scrub-item');
                
                // 1. Tooltip 容器
                const tooltip = createEl('div', 'scrub-tooltip');
                item.appendChild(tooltip);

                // 2. 视觉胶囊
                const visual = createEl('div', 'scrub-visual');
                item.appendChild(visual);

                // 点击事件
                item.addEventListener('click', (e) => {
                    e.stopPropagation();
                    uNode.scrollIntoView({ behavior: 'smooth', block: 'center' });
                });

                container.appendChild(item);
            }

            // 检查是否需要更新 Tooltip (减少 DOM 操作)
            if (item.dataset.uText !== uText || item.dataset.rText !== rText) {
                const tooltip = item.querySelector('.scrub-tooltip');
                tooltip.textContent = ''; // 安全清空

                // 安全构建 User 部分
                tooltip.appendChild(createTooltipBlock('User', uText, true));

                // 安全构建 Gemini 部分
                if (rText) {
                    tooltip.appendChild(createTooltipBlock('Gemini', rText, false));
                }

                item.dataset.uText = uText;
                item.dataset.rText = rText;
            }
        });
    }

    const observer = new MutationObserver(() => {
        clearTimeout(debounceTimer);
        debounceTimer = setTimeout(renderScrubber, CONFIG.debounceTime);
    });

    observer.observe(document.body, { childList: true, subtree: true });
    
    // 启动
    setTimeout(renderScrubber, 1000);
})();