// ==UserScript==
// @name         Gemini Minimal Scrubber
// @namespace    https://git.js0ny.net
// @version      1.6
// @description  Sidebar navigation with text preview. No scroll-spy, just click-to-jump.
// @author       js0ny
// @match        https://gemini.google.com/*
// @grant        GM_addStyle
// @run-at       document-idle
// ==/UserScript==

(function() {
    'use strict';

    const CONFIG = {
        debounceTime: 200,
        gap: '8px',
        tooltipWidth: '380px',
        hitAreaHeight: '32px',
        baseColor: 'rgba(255, 255, 255, 0.25)',
        hoverColor: '#a8c7fa',
    };

    GM_addStyle(`
        #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; /* 容器穿透 */
        }

        /* 1. 交互层 (热区) */
        .scrub-item {
            position: relative;
            height: ${CONFIG.hitAreaHeight};
            width: 32px; /* 稍微加宽热区 */
            display: flex;
            align-items: center;
            justify-content: flex-end;
            cursor: pointer;
            pointer-events: auto; /* 恢复点击 */
        }

        /* 2. 视觉层 (胶囊) */
        .scrub-visual {
            width: 6px;
            height: 24px;
            background-color: ${CONFIG.baseColor};
            border-radius: 99px;
            transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
            opacity: 0.6;
        }

        /* Hover 效果：变宽、变色、变高 */
        .scrub-item:hover .scrub-visual {
            background-color: ${CONFIG.hoverColor};
            width: 10px;
            height: 32px;
            opacity: 1;
            box-shadow: 0 0 10px ${CONFIG.hoverColor};
        }

        /* 3. 预览框 (Tooltip) */
        .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;
            box-shadow: 0 8px 32px rgba(0,0,0,0.6);
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transition: all 0.2s ease-out;

            text-rendering: optimizeLegibility;
            -webkit-font-smoothing: antialiased;
            font-family: "Google Sans", system-ui, sans-serif;
            font-size: 14px;
            line-height: 1.6;
            color: #e3e3e3;
            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;
            letter-spacing: 0.5px;
            margin-bottom: 4px;
            text-transform: uppercase;
        }
        .tooltip-text {
            word-wrap: break-word;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 6;
            -webkit-box-orient: vertical;
        }
        .tooltip-text.user { color: #d2e3fc; }
    `);

    let container = null;
    let debounceTimer = null;

    function getCleanText(element) {
        if (!element) return "";
        const p = element.querySelector("p");
        // 优先取 p，否则取纯文本，替换多余空白
        const raw = (p && p.textContent.trim()) ? p.textContent : element.textContent;
        return raw.replace(/\s+/g, ' ').trim();
    }

    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");

        // 没内容时清空
        if (uNodes.length === 0) {
            container.innerHTML = '';
            return;
        }

        // 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];

            const newTooltipContent = `
                <div class="tooltip-block">
                    <div class="tooltip-label">User</div>
                    <div class="tooltip-text user">${uText}</div>
                </div>
                ${rText ? `
                <div class="tooltip-block">
                    <div class="tooltip-label">Gemini</div>
                    <div class="tooltip-text model">${rText}</div>
                </div>` : ''}
            `;

            if (item) {
               // diff: update only on change
                const currentU = item.dataset.uText;
                const currentR = item.dataset.rText;

                if (currentU !== uText || currentR !== rText) {
                    const tooltip = item.querySelector('.scrub-tooltip');
                    if (tooltip) tooltip.innerHTML = newTooltipContent;
                    item.dataset.uText = uText;
                    item.dataset.rText = rText;
                }
            } else {
                item = document.createElement('div');
                item.className = 'scrub-item';
                item.dataset.uText = uText;
                item.dataset.rText = rText;

                item.innerHTML = `
                    <div class="scrub-tooltip">${newTooltipContent}</div>
                    <div class="scrub-visual"></div>
                `;

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

                container.appendChild(item);
            }
        });
    }

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

    observer.observe(document.body, { childList: true, subtree: true });

    setTimeout(renderScrubber, 1000);

})();