// --- static/edit-mode.js ---

import { 
    apiAcquireLock, apiReleaseLock, apiSendHeartbeat, 
    apiGetLeafOptions, apiSyncLeafOptions, apiGenerateCli, apiExecuteConfig,
    apiSyncLeafOptionsStream 
} from './api.js';
import { getGlobalConnectionInfo } from './utils.js';

// --- 安全跳脫 HTML 特殊字元，防止破版 ---
function escapeHTML(str) {
    if (str === null || str === undefined) return "";
    return String(str)
        .replace(/&/g, "&")
        .replace(/</g, "&lt;")
        .replace(/>/g, "&gt;")
        .replace(/"/g, "&quot;")
        .replace(/'/g, "&#39;");
}

// ==========================================
// 1. 全域狀態與鎖定管理 (Lock Management)
// ==========================================
export const SESSION_USER_ID = crypto.randomUUID ? crypto.randomUUID() : 'user-' + Math.random().toString(36).substr(2, 9);
const ACTIVE_HEARTBEATS = {}; 

// 🌟 新增：用來防禦「秒按取消」導致的非同步渲染競爭危害
const activeEditSessions = new Set();

export let currentEditPath = null;
export let currentEditElementId = null;
export let currentEditIsSuccess = false;
export let currentEditType = null; 
export let currentEditDiffs = []; 

export async function releaseAllLocks() {
    const keysToRelease = Object.keys(ACTIVE_HEARTBEATS);
    
    // 🌟 1. 檢查當前是否處於 God Mode 狀態
    const wasGodModeUnlocked = sessionStorage.getItem('godModeUnlocked') === 'true';
    
    // 🌟 2. 只要觸發閒置，立刻無條件清除 God Mode 權限
    sessionStorage.removeItem('godModeUnlocked');

    if (keysToRelease.length === 0) {
        // 如果沒有正在編輯的節點，但剛剛是 God Mode，依然要登出並重整
        if (wasGodModeUnlocked) {
            alert("您已閒置超過 5 分鐘，系統已自動為您登出進階維護者模式。");
            location.reload();
        }
        return;
    }

    const releasePromises = keysToRelease.map(key => {
        const [host, path] = key.split('@@');
        clearInterval(ACTIVE_HEARTBEATS[key]);
        delete ACTIVE_HEARTBEATS[key];
        return apiReleaseLock(path, SESSION_USER_ID, host)
            .catch(err => console.error(`釋放鎖定 ${path} 失敗:`, err));
    });

    await Promise.all(releasePromises);
    alert("您已閒置超過 5 分鐘，系統已自動釋放編輯鎖定並登出進階模式。");
    location.reload(); // 重整網頁，確保所有 UI 恢復未解鎖狀態
}

async function sendHeartbeat(path, host, intervalId, lockKey) {
    try {
        const response = await apiSendHeartbeat(path, SESSION_USER_ID, host);
        if (!response.ok) {
            console.warn(`心跳發送失敗 (${path}): 伺服器回傳 ${response.status}`);
            if (response.status === 404) {
                clearInterval(intervalId);
                if (ACTIVE_HEARTBEATS[lockKey] === intervalId) {
                    delete ACTIVE_HEARTBEATS[lockKey];
                }
            }
        }
    } catch (error) {
        console.error(`心跳請求發生錯誤 (${path}):`, error);
    }
}

// ==========================================
// 2. 編輯模式啟動與取消 (Folder & Leaf)
// ==========================================

export async function startEditFolder(path, elementId) {
    if (activeEditSessions.has(elementId)) return;
    activeEditSessions.add(elementId); 

    const connInfo = getGlobalConnectionInfo();
    const username = connInfo ? connInfo.user : 'admin';
    const host = connInfo ? connInfo.host : ''; 
    const lockKey = `${host}@@${path}`; 

    const editBtn = document.getElementById(`edit-btn-${elementId}`);
    if (editBtn) {
        editBtn.style.pointerEvents = 'none';
        editBtn.innerText = "⏳";
    }

    try {
        const result = await apiAcquireLock(path, SESSION_USER_ID, username, host);
        
        if (!activeEditSessions.has(elementId)) {
            if (result.status === 200 || (result.data && result.data.status === 'success')) {
                if (!window.recentlyReleasedLocks) window.recentlyReleasedLocks = {};
                window.recentlyReleasedLocks[`${host}@@${path}`] = Date.now();
                apiReleaseLock(path, SESSION_USER_ID, host); 
            }
            if (editBtn) {
                editBtn.style.pointerEvents = 'auto';
                editBtn.style.opacity = '0.3';
                editBtn.title = "鎖定並編輯此項目";
                editBtn.innerText = "✏️";
            }
            return; 
        }

        if (result.status === 409) {
            activeEditSessions.delete(elementId);
            if (editBtn) {
                editBtn.style.pointerEvents = 'auto';
                editBtn.innerText = "✏️";
            }
            return alert(`⚠️ ${result.data.detail}`); 
        }
        
        if (result.data.status === 'success') {
            if (ACTIVE_HEARTBEATS[lockKey]) clearInterval(ACTIVE_HEARTBEATS[lockKey]);
            let intervalId;
            intervalId = setInterval(() => sendHeartbeat(path, host, intervalId, lockKey), 15000);
            ACTIVE_HEARTBEATS[lockKey] = intervalId;
            
            if (!window.globalActiveLocks) window.globalActiveLocks = {};
            if (!window.globalActiveLocks[host]) window.globalActiveLocks[host] = {};
            window.globalActiveLocks[host][path] = { user_id: SESSION_USER_ID, username: username };
            
            if (window.recentlyReleasedLocks) {
                delete window.recentlyReleasedLocks[`${host}@@${path}`];
            }
            
            const safePath = path.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
            document.querySelectorAll(`.edit-btn[data-path="${safePath}"], .edit-btn[data-path^="${safePath}::"]`).forEach(btn => {
                if (btn.id !== `edit-btn-${elementId}`) {
                    btn.style.pointerEvents = 'none';
                    btn.style.opacity = '0.2';
                    
                    const btnPath = btn.getAttribute('data-path');
                    if (btnPath === path) {
                        btn.title = `🔒 您正在另一個視圖編輯此項目`;
                    } else {
                        btn.title = `🔒 父層級已被鎖定，無法編輯此項目`;
                    }
                    btn.innerText = "🔒";
                }
            });
            
            if (editBtn) editBtn.style.display = 'none';
            
            const actionBtn = document.getElementById(`actions-${elementId}`);
            if (actionBtn) actionBtn.style.display = 'inline-block';
            
            const detailsEl = document.getElementById(`details-${elementId}`);
            if (detailsEl) detailsEl.open = true; 

            // ==========================================
            // 🌟 完美修復：在抓取葉子節點前，強制將該資料夾底下的所有 HTML 預先渲染出來
            // 這樣 querySelectorAll 就能一次抓到所有深層的欄位！
            // ==========================================
            if (typeof window.forceRenderFolderHTML === 'function') {
                window.forceRenderFolderHTML(elementId);
            }

            const contentDiv = document.getElementById(`content-${elementId}`);
            if (!contentDiv) return; 
            
            const leafContainers = contentDiv.querySelectorAll('.leaf-container');
            
            let optData = {};
            try { optData = await apiGetLeafOptions(host); } catch (e) {}

            if (!activeEditSessions.has(elementId)) return;

            const pathsToSync = [];
            const containersArray = Array.from(leafContainers);

            // 🌟 第一階段：盤點缺少的快取
            containersArray.forEach(container => {
                const rawPath = container.getAttribute('data-path');
                const origVal = container.getAttribute('data-original');
                let cacheKey = rawPath.replace(/::/g, ' ').replace(/\s*\[\d+\]/g, '');
                if (rawPath.endsWith('::no')) cacheKey = cacheKey.replace(/ no$/, '') + ' ' + origVal;

                if (!optData[cacheKey]) pathsToSync.push(cacheKey);
            });

            // 🌟 第二階段：如果有缺，觸發同步並「等待」
            if (pathsToSync.length > 0) {
                // 先讓所有欄位顯示載入中
                containersArray.forEach(c => c.innerHTML = `<span style="font-size: 12px; color: #f39c12; font-weight: bold;">⏳ 載入選項中...</span>`);

                apiSyncLeafOptions(host, pathsToSync);

                for (let i = 0; i < 10; i++) {
                    if (!activeEditSessions.has(elementId)) return;
                    await new Promise(resolve => setTimeout(resolve, 1000));
                    optData = await apiGetLeafOptions(host);

                    // 檢查是否至少抓到一部分了 (只要有 hint 或 options 就當作抓到了)
                    const isMakingProgress = pathsToSync.some(p => optData[p] && (optData[p].hint || (optData[p].options && optData[p].options.length > 0)));
                    if (isMakingProgress && i > 2) break; // 給它至少 3 秒，有進度就放行，避免死等
                }
            }

            if (!activeEditSessions.has(elementId)) return;

            // 🌟 第三階段：正式渲染輸入框與 ❓
            const CHUNK_SIZE = 50; 
            for (let i = 0; i < containersArray.length; i += CHUNK_SIZE) {
                if (!activeEditSessions.has(elementId)) return;
                const chunk = containersArray.slice(i, i + CHUNK_SIZE);
                
                chunk.forEach(container => {
                    const origVal = container.getAttribute('data-original');
                    const rawPath = container.getAttribute('data-path');
                    const safeOrigVal = escapeHTML(origVal);

                    let cacheKey = rawPath.replace(/::/g, ' ').replace(/\s*\[\d+\]/g, '');
                    if (rawPath.endsWith('::no')) cacheKey = cacheKey.replace(/ no$/, '') + ' ' + origVal;
                    let leafCache = optData[cacheKey];

                    let inputHtml = "";
                    let hintAttr = "";
                    let hintIcon = "";

                    if (leafCache && leafCache.hint) {
                        const safeHint = leafCache.hint.replace(/"/g, '&quot;');
                        hintAttr = `title="${safeHint}"`;
                        hintIcon = `<span style="cursor: help; margin-left: 6px; color: #e67e22; font-size: 14px;" title="${safeHint}">❓</span>`;
                    }

                    if (leafCache && leafCache.options && leafCache.options.length > 0) {
                        let options = leafCache.options;
                        if (origVal && !options.includes(origVal)) options = [origVal, ...options];

                        inputHtml = `<select class="edit-input" data-path="${rawPath}" ${hintAttr} style="padding: 2px 6px; border: 1px solid #3498db; border-radius: 3px; font-family: Courier New, monospace; font-size: 13px; width: 200px; height: 26px; outline: none; margin-left: 5px; background-color: white; cursor: pointer;">`;
                        options.forEach(opt => {
                            const safeOpt = escapeHTML(opt);
                            const isSelected = (opt === origVal) ? 'selected' : '';
                            inputHtml += `<option value="${safeOpt}" ${isSelected}>${safeOpt}</option>`;
                        });
                        inputHtml += `</select>${hintIcon}`;
                    } else {
                        inputHtml = `<input type="text" class="edit-input" data-path="${rawPath}" value="${safeOrigVal}" ${hintAttr} style="padding: 2px 6px; border: 1px solid #3498db; border-radius: 3px; font-family: Courier New, monospace; font-size: 13px; width: 200px; outline: none; margin-left: 5px;">${hintIcon}`;
                    }
                    container.innerHTML = inputHtml;
                });
                
                await new Promise(resolve => setTimeout(resolve, 0)); 
            }
        }
    } catch (error) {
        activeEditSessions.delete(elementId);
        if (editBtn) {
            editBtn.style.pointerEvents = 'auto';
            editBtn.innerText = "✏️";
        }
        alert("❌ 無法連線到鎖定伺服器：" + error.message);
    }
}

export async function startEditLeaf(path, elementId) {
    if (activeEditSessions.has(elementId)) return;
    activeEditSessions.add(elementId);

    const connInfo = getGlobalConnectionInfo();
    const username = connInfo ? connInfo.user : 'admin';
    const host = connInfo ? connInfo.host : '';
    const lockKey = `${host}@@${path}`;

    const editBtn = document.getElementById(`edit-btn-${elementId}`);
    if (editBtn) {
        editBtn.style.pointerEvents = 'none';
        editBtn.innerText = "⏳";
    }

    try {
        const result = await apiAcquireLock(path, SESSION_USER_ID, username, host);
        
        if (!activeEditSessions.has(elementId)) {
            if (result.status === 200 || (result.data && result.data.status === 'success')) {
                if (!window.recentlyReleasedLocks) window.recentlyReleasedLocks = {};
                window.recentlyReleasedLocks[`${host}@@${path}`] = Date.now();
                apiReleaseLock(path, SESSION_USER_ID, host);
            }
            if (editBtn) {
                editBtn.style.pointerEvents = 'auto';
                editBtn.style.opacity = '0.3';
                editBtn.title = "鎖定並編輯此項目";
                editBtn.innerText = "✏️";
            }
            return;
        }

        if (result.status === 409) {
            activeEditSessions.delete(elementId);
            if (editBtn) {
                editBtn.style.pointerEvents = 'auto';
                editBtn.innerText = "✏️";
            }
            return alert(`⚠️ ${result.data.detail}`); 
        }
        
        if (result.data.status === 'success') {
            if (ACTIVE_HEARTBEATS[lockKey]) clearInterval(ACTIVE_HEARTBEATS[lockKey]);
            let intervalId;
            intervalId = setInterval(() => sendHeartbeat(path, host, intervalId, lockKey), 15000);
            ACTIVE_HEARTBEATS[lockKey] = intervalId;
            
            if (!window.globalActiveLocks) window.globalActiveLocks = {};
            if (!window.globalActiveLocks[host]) window.globalActiveLocks[host] = {};
            window.globalActiveLocks[host][path] = { user_id: SESSION_USER_ID, username: username };
            
            if (window.recentlyReleasedLocks) {
                delete window.recentlyReleasedLocks[`${host}@@${path}`];
            }
            
            const safePath = path.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
            document.querySelectorAll(`.edit-btn[data-path="${safePath}"]`).forEach(btn => {
                if (btn.id !== `edit-btn-${elementId}`) {
                    btn.style.pointerEvents = 'none';
                    btn.style.opacity = '0.2';
                    btn.title = `🔒 您正在另一個視圖編輯此項目`;
                    btn.innerText = "🔒";
                }
            });
            
            if (editBtn) editBtn.style.display = 'none';
            document.getElementById(`actions-${elementId}`).style.display = 'inline-block';

            const container = document.getElementById(`container-${elementId}`);
            const origVal = container.getAttribute('data-original');
            const safeOrigVal = escapeHTML(origVal);
            
            container.innerHTML = `<span style="font-size: 12px; color: #f39c12; margin-left: 5px; font-weight: bold;">⏳ 設備連線與載入選項中...</span>`;
            
            try {
                let optData = await apiGetLeafOptions(host);
                let cacheKey = path.replace(/::/g, ' ').replace(/\s*\[\d+\]/g, '');
                if (path.endsWith('::no')) cacheKey = cacheKey.replace(/ no$/, '') + ' ' + origVal;
                let leafCache = optData[cacheKey];

                if (!leafCache) {
                    apiSyncLeafOptions(host, [cacheKey]);
                    let found = false;
                    for (let i = 0; i < 10; i++) {
                        if (!activeEditSessions.has(elementId)) return; 
                        await new Promise(resolve => setTimeout(resolve, 1000));
                        optData = await apiGetLeafOptions(host);
                        leafCache = optData[cacheKey];
                        
                        if (leafCache && (leafCache.hint || (leafCache.options && leafCache.options.length > 0))) {
                            found = true; break;
                        }
                    }
                }

                if (!activeEditSessions.has(elementId)) return; 

                let inputHtml = "";
                let hintAttr = "";
                let hintIcon = "";

                if (leafCache && leafCache.hint) {
                    const safeHint = leafCache.hint.replace(/"/g, '&quot;');
                    hintAttr = `title="${safeHint}"`;
                    hintIcon = `<span style="cursor: help; margin-left: 6px; color: #e67e22; font-size: 14px;" title="${safeHint}">❓</span>`;
                }

                if (leafCache && leafCache.options && leafCache.options.length > 0) {
                    let options = leafCache.options;
                    if (origVal && !options.includes(origVal)) options = [origVal, ...options];

                    inputHtml = `<select class="edit-input" data-path="${path}" ${hintAttr} style="padding: 2px 6px; border: 1px solid #3498db; border-radius: 3px; font-family: Courier New, monospace; font-size: 13px; width: 200px; height: 26px; outline: none; margin-left: 5px; background-color: white; cursor: pointer;">`;
                    options.forEach(opt => {
                        const safeOpt = escapeHTML(opt);
                        const isSelected = (opt === origVal) ? 'selected' : '';
                        inputHtml += `<option value="${safeOpt}" ${isSelected}>${safeOpt}</option>`;
                    });
                    inputHtml += `</select>${hintIcon}`;
                } else {
                    inputHtml = `<input type="text" class="edit-input" data-path="${path}" value="${safeOrigVal}" ${hintAttr} style="padding: 2px 6px; border: 1px solid #3498db; border-radius: 3px; font-family: Courier New, monospace; font-size: 13px; width: 200px; outline: none; margin-left: 5px;">${hintIcon}`;
                }
                container.innerHTML = inputHtml;
            } catch (e) {
                if (!activeEditSessions.has(elementId)) return; 
                container.innerHTML = `<input type="text" class="edit-input" data-path="${path}" value="${safeOrigVal}" style="padding: 2px 6px; border: 1px solid #3498db; border-radius: 3px; font-family: Courier New, monospace; font-size: 13px; width: 200px; outline: none; margin-left: 5px;">`;
            }
        }
    } catch (error) {
        activeEditSessions.delete(elementId);
        if (editBtn) {
            editBtn.style.pointerEvents = 'auto';
            editBtn.innerText = "✏️";
        }
        alert("❌ 無法連線到鎖定伺服器：" + error.message);
    }
}

export async function cancelEditFolder(path, elementId) {
    activeEditSessions.delete(elementId); // 🚨 防護：註銷編輯狀態，強制中斷背景渲染迴圈

    const connInfo = getGlobalConnectionInfo();
    const host = connInfo ? connInfo.host : '';
    const lockKey = `${host}@@${path}`;

    if (ACTIVE_HEARTBEATS[lockKey]) {
        clearInterval(ACTIVE_HEARTBEATS[lockKey]);
        delete ACTIVE_HEARTBEATS[lockKey];
    }
    
    // 🌟 關鍵修復：寫入防閃爍冷卻表必須在 await 之前！防止 API 延遲期間被輪詢重新上鎖
    if (!window.recentlyReleasedLocks) window.recentlyReleasedLocks = {};
    window.recentlyReleasedLocks[`${host}@@${path}`] = Date.now();

    try { await apiReleaseLock(path, SESSION_USER_ID, host); } catch (error) {}

    // 🌟 立即解除全域鎖定狀態 (加入 Host 隔離)
    if (window.globalActiveLocks && window.globalActiveLocks[host] && window.globalActiveLocks[host][path]) {
        delete window.globalActiveLocks[host][path];
    }
    const safePath = path.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
    // 🌟 擴大選擇器：連同所有子節點一起秒級解除鎖定
    document.querySelectorAll(`.edit-btn[data-path="${safePath}"], .edit-btn[data-path^="${safePath}::"]`).forEach(btn => {
        if (btn.id !== `edit-btn-${elementId}`) {
            const btnPath = btn.getAttribute('data-path');
            let stillLockedByOther = false;
            
            // 確保解除鎖定時，不會誤解開被其他父節點鎖定的子節點
            if (window.globalActiveLocks && window.globalActiveLocks[host]) {
                const hostLocks = window.globalActiveLocks[host];
                if (hostLocks[btnPath]) {
                    stillLockedByOther = true;
                } else {
                    for (const lockedPath of Object.keys(hostLocks)) {
                        if (btnPath.startsWith(lockedPath + "::")) {
                            stillLockedByOther = true;
                            break;
                        }
                    }
                }
            }
            
            if (!stillLockedByOther) {
                btn.style.pointerEvents = 'auto';
                btn.style.opacity = '0.3';
                btn.title = "鎖定並編輯此項目";
                btn.innerText = "✏️";
            }
        }
    });
    
    const editBtn = document.getElementById(`edit-btn-${elementId}`);
    if (editBtn) {
        editBtn.style.display = 'inline-block';
        editBtn.style.pointerEvents = 'auto';
        editBtn.style.opacity = '0.3';
        editBtn.title = "鎖定並編輯此項目";
        editBtn.innerText = "✏️"; // 🌟 確保沙漏被清掉
    }
    
    const actionBtns = document.getElementById(`actions-${elementId}`);
    if (actionBtns) actionBtns.style.display = 'none';

    const contentDiv = document.getElementById(`content-${elementId}`);
    const leafContainers = contentDiv.querySelectorAll('.leaf-container');
    leafContainers.forEach(container => {
        const origVal = container.getAttribute('data-original');
        const safeOrigVal = escapeHTML(origVal);
        container.innerHTML = `<span class="leaf-value" style="color: #16a085; margin-left: 5px; font-family: Courier New, monospace;">${safeOrigVal}</span>`;
    });

    // 🌟 聯動防呆機制：如果右側預覽視窗正在顯示這個節點的指令，連帶關閉它，防止無鎖寫入
    if (currentEditElementId === elementId) {
        document.querySelectorAll('.tree-view-instance').forEach(pane => {
            pane.style.flex = '1';
            pane.style.width = '100%';
            pane.style.maxWidth = 'none';
        });
        const rightPane = document.getElementById('side-cli-preview');
        if (rightPane) {
            rightPane.style.flex = '1';
            rightPane.style.maxWidth = '50%';
            rightPane.style.width = '';
            rightPane.style.display = 'none';
        }
        document.getElementById('drag-resizer').style.display = 'none';

        currentEditPath = null;
        currentEditElementId = null;
        currentEditIsSuccess = false;
        currentEditType = null;
    }
}

export async function cancelEditLeaf(path, elementId) {
    activeEditSessions.delete(elementId); // 🚨 防護：註銷編輯狀態，強制中斷背景渲染迴圈

    const connInfo = getGlobalConnectionInfo();
    const host = connInfo ? connInfo.host : '';
    const lockKey = `${host}@@${path}`;

    if (ACTIVE_HEARTBEATS[lockKey]) {
        clearInterval(ACTIVE_HEARTBEATS[lockKey]);
        delete ACTIVE_HEARTBEATS[lockKey];
    }
    
    // 🌟 關鍵修復：寫入防閃爍冷卻表必須在 await 之前！防止 API 延遲期間被輪詢重新上鎖
    if (!window.recentlyReleasedLocks) window.recentlyReleasedLocks = {};
    window.recentlyReleasedLocks[`${host}@@${path}`] = Date.now();

    try { await apiReleaseLock(path, SESSION_USER_ID, host); } catch (error) {}

    // 🌟 立即解除全域鎖定狀態 (加入 Host 隔離)
    if (window.globalActiveLocks && window.globalActiveLocks[host] && window.globalActiveLocks[host][path]) {
        delete window.globalActiveLocks[host][path];
    }
    const safePath = path.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
    document.querySelectorAll(`.edit-btn[data-path="${safePath}"]`).forEach(btn => {
        if (btn.id !== `edit-btn-${elementId}`) {
            btn.style.pointerEvents = 'auto';
            btn.style.opacity = '0.3';
            btn.title = "鎖定並編輯此項目";
            btn.innerText = "✏️";
        }
    });
    
    const editBtn = document.getElementById(`edit-btn-${elementId}`);
    if (editBtn) {
        editBtn.style.display = 'inline-block';
        editBtn.style.pointerEvents = 'auto';
        editBtn.style.opacity = '0.3';
        editBtn.title = "鎖定並編輯此項目";
        editBtn.innerText = "✏️"; // 🌟 確保沙漏被清掉
    }
    
    const actionBtns = document.getElementById(`actions-${elementId}`);
    if (actionBtns) actionBtns.style.display = 'none';

    const container = document.getElementById(`container-${elementId}`);
    const origVal = container.getAttribute('data-original');
    const safeOrigVal = escapeHTML(origVal);
    container.innerHTML = `<span class="leaf-value" style="color: #16a085; margin-left: 5px; font-family: Courier New, monospace;">${safeOrigVal}</span>`;

    // 🌟 聯動防呆機制：如果右側預覽視窗正在顯示這個節點的指令，連帶關閉它，防止無鎖寫入
    if (currentEditElementId === elementId) {
        document.querySelectorAll('.tree-view-instance').forEach(pane => {
            pane.style.flex = '1';
            pane.style.width = '100%';
            pane.style.maxWidth = 'none';
        });
        const rightPane = document.getElementById('side-cli-preview');
        if (rightPane) {
            rightPane.style.flex = '1';
            rightPane.style.maxWidth = '50%';
            rightPane.style.width = '';
            rightPane.style.display = 'none';
        }
        document.getElementById('drag-resizer').style.display = 'none';

        currentEditPath = null;
        currentEditElementId = null;
        currentEditIsSuccess = false;
        currentEditType = null;
    }
}

// ==========================================
// 3. CLI 生成與預覽 (CLI Generation)
// ==========================================
function getInterfacesWithAdminState() {
    const currentMode = document.getElementById('configTask').value === 'form-full-config' ? 'full' : 'running';
    const activeContainer = document.getElementById(`tree-container-${currentMode}`);
    if (!activeContainer) return [];
    
    const nodes = activeContainer.querySelectorAll('.leaf-container');
    const interfaces = new Set();
    nodes.forEach(node => {
        const path = node.getAttribute('data-path');
        if (path && path.endsWith('::admin-state')) {
            const interfacePath = path.replace('::admin-state', '').replace(/::/g, ' ').replace(/\s*\[\d+\]/g, '');
            interfaces.add(interfacePath);
        }
    });
    return Array.from(interfaces);
}

export async function previewFolderCLI(path, elementId) {
    currentEditPath = path;
    currentEditElementId = elementId;
    currentEditIsSuccess = false;
    currentEditType = 'folder'; 

    const contentDiv = document.getElementById(`content-${elementId}`);
    if (!contentDiv) return;

    const inputs = contentDiv.querySelectorAll('.edit-input');
    const diffs = [];

    inputs.forEach(input => {
        const container = input.closest('.leaf-container');
        if (!container) return;
        const originalVal = container.getAttribute('data-original') || "";
        const newVal = input.value.trim();
        const nodePath = container.getAttribute('data-path');
        
        if (originalVal !== newVal && nodePath) {
            diffs.push({ path: nodePath, old_val: originalVal, new_val: newVal });
        }
    });

    if (diffs.length === 0) return alert("沒有偵測到任何修改，無需生成指令！");
    currentEditDiffs = diffs; 

    try {
        const result = await apiGenerateCli(diffs, getInterfacesWithAdminState());
        if (result.status === 'success') {
            showCliPreviewModal(result.data);
        } else {
            alert("CLI 生成失敗: " + result.message);
        }
    } catch (error) {
        console.error("Error generating CLI:", error);
        alert("網路連線錯誤，無法生成 CLI");
    }
}

export async function previewLeafCLI(path, elementId) {
    currentEditPath = path;
    currentEditElementId = elementId;
    currentEditIsSuccess = false;
    currentEditType = 'leaf'; 

    const container = document.getElementById(`container-${elementId}`);
    if (!container) return;

    const input = container.querySelector('.edit-input');
    if (!input) return;

    const originalVal = container.getAttribute('data-original') || "";
    const newVal = input.value.trim();
    if (originalVal === newVal) return alert("沒有偵測到任何修改，無需生成指令！");

    const diffs = [{ path: path, old_val: originalVal, new_val: newVal }];
    currentEditDiffs = diffs; 

    try {
        const result = await apiGenerateCli(diffs, getInterfacesWithAdminState());
        if (result.status === 'success') {
            showCliPreviewModal(result.data);
        } else {
            alert("CLI 生成失敗: " + result.message);
        }
    } catch (error) {
        alert("網路連線錯誤，無法生成 CLI");
    }
}

function showCliPreviewModal(cliScript) {
    const leftPanes = document.querySelectorAll('.tree-view-instance');
    const resizer = document.getElementById('drag-resizer');
    const rightPane = document.getElementById('side-cli-preview');
    
    document.getElementById('side-pane-title').innerHTML = '⚠️ 即將寫入的指令';
    document.getElementById('side-pane-title').style.color = '#f1c40f';
    document.getElementById('btn-side-cancel').style.display = 'inline-block';
    document.getElementById('btn-side-confirm').style.display = 'inline-block';
    document.getElementById('btn-side-close').style.display = 'none';
    document.getElementById('btn-side-close').textContent = '關閉';
    document.getElementById('side-cli-textarea').style.display = 'block';
    document.getElementById('side-execution-result').style.display = 'none';
    
    const textarea = document.getElementById('side-cli-textarea');
    textarea.value = cliScript;
    
    textarea.readOnly = false; 
    textarea.style.backgroundColor = '#1e1e1e'; 
    textarea.style.color = '#ecf0f1';           
    
    // 🛡️ 安全修改：解除 Flexbox 均分限制，讓 JS 拖拉的 width 生效
    leftPanes.forEach(pane => {
        pane.style.flex = 'none';
        pane.style.maxWidth = 'none';
        pane.style.width = 'calc(50% - 11px)';
    });
    rightPane.style.flex = 'none';
    rightPane.style.maxWidth = 'none';
    rightPane.style.width = 'calc(50% - 11px)';
    
    resizer.style.display = 'flex';
    rightPane.style.display = 'block';
    
    if (!window.isResizerInitialized) {
        initResizer();
        window.isResizerInitialized = true;
    }
}

// ==========================================
// 4. 側邊欄與執行邏輯
// ==========================================
export async function hideSideCLI() {
    // 🌟 完美修復：明確恢復 Flexbox 伸展能力與 100% 寬度
    document.querySelectorAll('.tree-view-instance').forEach(pane => {
        pane.style.flex = '1';       // 恢復 HTML 原本賦予的彈性伸展能力
        pane.style.width = '100%';   // 強制撐滿整個父容器
        pane.style.maxWidth = 'none';
    });
    
    const rightPane = document.getElementById('side-cli-preview');
    if (rightPane) {
        rightPane.style.flex = '1';
        rightPane.style.maxWidth = '50%'; // 恢復 HTML 原本的 50% 限制
        rightPane.style.width = '';
        rightPane.style.display = 'none';
    }
    
    document.getElementById('drag-resizer').style.display = 'none';

    // 以下為原本的取消編輯與還原邏輯，完全保持不變，確保功能安全
    if (currentEditIsSuccess && currentEditElementId && currentEditPath) {
        const wrapper = document.getElementById(`display-wrapper-${currentEditElementId}`);
        if (wrapper) {
            const container = document.getElementById(`container-${currentEditElementId}`);
            const input = container ? container.querySelector('.edit-input') : null;
            const newCommand = input ? input.value.trim() : (container ? container.getAttribute('data-original') : '');
            
            if (currentEditType === 'folder') await cancelEditFolder(currentEditPath, currentEditElementId);
            else await cancelEditLeaf(currentEditPath, currentEditElementId);
            
            transformNoToActive(currentEditElementId, newCommand);
        } else {
            if (currentEditType === 'folder') await applyEditFolder(currentEditPath, currentEditElementId);
            else if (currentEditType === 'leaf') await applyEditLeaf(currentEditPath, currentEditElementId);
        }
    }

    currentEditPath = null;
    currentEditElementId = null;
    currentEditIsSuccess = false;
    currentEditType = null;
}

async function applyEditFolder(path, elementId) {
    const contentDiv = document.getElementById(`content-${elementId}`);
    if (contentDiv) {
        const inputs = contentDiv.querySelectorAll('.edit-input');
        inputs.forEach(input => {
            const container = input.closest('.leaf-container');
            if (container) container.setAttribute('data-original', input.value.trim()); 
        });
    }
    await cancelEditFolder(path, elementId);
}

async function applyEditLeaf(path, elementId) {
    const container = document.getElementById(`container-${elementId}`);
    if (container) {
        const input = container.querySelector('.edit-input');
        if (input) container.setAttribute('data-original', input.value.trim()); 
    }
    await cancelEditLeaf(path, elementId);
}

export function executeSideCLI() {
    const finalScript = document.getElementById('side-cli-textarea').value;
    document.getElementById('side-pane-title').innerHTML = '⏳ 正在寫入設備...';
    document.getElementById('side-pane-title').style.color = '#f39c12'; // 🌟 統一載入中狀態為橘色 (原為 #3498db)
    document.getElementById('btn-side-cancel').style.display = 'none';
    document.getElementById('btn-side-confirm').style.display = 'none';
    document.getElementById('btn-side-close').style.display = 'none'; 
    document.getElementById('side-cli-textarea').style.display = 'none';
    
    const resultBox = document.getElementById('side-execution-result');
    resultBox.style.display = 'block';
    resultBox.innerHTML = `<span style="color: #ecf0f1;">${finalScript}</span>`;
    
    executeGeneratedCLI(finalScript);
}

async function executeGeneratedCLI(script) {
    const connInfo = getGlobalConnectionInfo();
    if (!connInfo) return;

    const outputEl = document.getElementById('side-execution-result');
    
    // 1. 建立即時 Log 視窗 UI (無邊界滿版融合風格)
    outputEl.innerHTML = `
        <div id="edit-log-container" style="width: 100%; height: 100%; background: transparent; border: none; padding: 0; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; color: #ecf0f1; font-size: 14px; line-height: 1.5; text-align: left; margin: 0; box-sizing: border-box;">
            <div style="color: #f39c12; font-weight: bold; margin-bottom: 8px;">[系統] ⏳ 正在透過 SSH 寫入指令，請勿關閉視窗...</div>
            <div style="color: #7f8c8d;">[系統] 準備連線至設備 ${connInfo.host}...</div>
        </div>
    `;
    const logContainer = document.getElementById('edit-log-container');
    
    // 🌟 修正 1: 捲動目標必須是真正有捲軸的容器
    const scrollTarget = document.getElementById('side-execution-result'); 

    try {
        const response = await fetch('/api/v1/cmts-config', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ 
                script: script, 
                host: connInfo.host, 
                username: connInfo.user, 
                password: connInfo.pass 
            })
        });

        const reader = response.body.getReader();
        const decoder = new TextDecoder("utf-8");
        let buffer = "";
        let isSuccess = false;

        while (true) {
            const { done, value } = await reader.read();
            if (done) break;

            buffer += decoder.decode(value, { stream: true });
            let lines = buffer.split('\n');
            buffer = lines.pop(); 

            for (let line of lines) {
                if (!line.trim()) continue;
                try {
                    const data = JSON.parse(line);
                    const timeStr = new Date().toLocaleTimeString('en-US', { hour12: false });
                    
                    if (data.status === 'progress') {
                        logContainer.innerHTML += `<div style="margin-top: 4px;"><span style="color: #3498db;">[${timeStr}]</span> ${data.message}</div>`;
                    } else if (data.status === 'success') {
                        isSuccess = true;
                        logContainer.innerHTML += `
                            <div style="margin-top: 15px; color: #2ecc71; font-weight: bold; font-size: 14px;">[${timeStr}] ${data.message}</div>
                        `;
                        document.getElementById('side-pane-title').innerHTML = '✅ 寫入成功！正在同步快取...';
                        document.getElementById('side-pane-title').style.color = '#f39c12';
                    } else if (data.status === 'error') {
                        logContainer.innerHTML += `<div style="margin-top: 10px; color: #e74c3c; font-weight: bold;">[${timeStr}] ${data.message}</div>`;
                        if (data.output) {
                            logContainer.innerHTML += `<div style="color: #c0392b; margin-left: 10px; border-left: 2px solid #c0392b; padding-left: 8px;">設備回傳: ${data.output}</div>`;
                        }
                        document.getElementById('btn-side-close').style.display = 'inline-block';
                        document.getElementById('side-pane-title').innerHTML = '❌ 執行失敗';
                        document.getElementById('side-pane-title').style.color = '#ff6b6b';
                    }
                    
                    // 自動捲動到最底部
                    if (scrollTarget) scrollTarget.scrollTop = scrollTarget.scrollHeight;
                } catch (e) {
                    console.warn("解析串流 JSON 失敗:", line);
                }
            }
        }

        // 4. 串流結束後，執行快取同步
        if (isSuccess) {
            currentEditIsSuccess = true; 
            
            const pathsToSync = currentEditDiffs.map(d => {
                let cacheKey = d.path.replace(/::/g, ' ').replace(/\s*\[\d+\]/g, '');
                if (d.path.endsWith('::no')) cacheKey = cacheKey.replace(/ no$/, '') + ' ' + d.old_val;
                return cacheKey;
            });
            const uniquePaths = [...new Set(pathsToSync)];

            try {
                const currentMode = document.getElementById('configTask').value === 'form-full-config' ? 'full' : 'running';
                let isSyncDone = false;

                // 🌟 修正 2: 先啟動 SSE 監聽 (避免錯過 done 事件)
                const streamPromise = apiSyncLeafOptionsStream(connInfo.host, uniquePaths, (data) => {
                    const titleEl = document.getElementById('side-pane-title');
                    
                    if (data.event === 'done' || data.status === 'done') {
                        isSyncDone = true;
                        if (titleEl) {
                            titleEl.innerHTML = '✅ 寫入成功！快取同步完成';
                            titleEl.style.color = '#2ecc71';
                        }
                        document.getElementById('btn-side-close').style.display = 'inline-block'; 
                        logContainer.innerHTML += `<br><span style="color: #2ecc71; font-weight: bold;">[系統] 快取同步完成！您可以關閉此面板。</span>`;
                        if (scrollTarget) scrollTarget.scrollTop = scrollTarget.scrollHeight;
                        
                    } else if (data.event === 'error' || data.status === 'error') {
                        isSyncDone = true;
                        if (titleEl) {
                            titleEl.innerHTML = '⚠️ 寫入成功 (但同步快取失敗)';
                            titleEl.style.color = '#e74c3c';
                        }
                        document.getElementById('btn-side-close').style.display = 'inline-block'; 
                        logContainer.innerHTML += `<br><span style="color: #e74c3c; font-weight: bold;">[系統] 同步失敗: ${data.message || '未知錯誤'}</span>`;
                        if (scrollTarget) scrollTarget.scrollTop = scrollTarget.scrollHeight;
                    }
                });

                // 🌟 修正 3: 再觸發後端同步任務
                apiSyncLeafOptions(connInfo.host, uniquePaths, currentMode, connInfo.user, connInfo.pass);

                // 🌟 修正 4: 加入 8 秒防呆機制，如果後端默默做完沒通知，自動放行
                setTimeout(() => {
                    if (!isSyncDone) {
                        const titleEl = document.getElementById('side-pane-title');
                        if (titleEl) {
                            titleEl.innerHTML = '✅ 寫入成功！(快取同步已於背景完成)';
                            titleEl.style.color = '#2ecc71';
                        }
                        document.getElementById('btn-side-close').style.display = 'inline-block'; 
                        logContainer.innerHTML += `<br><span style="color: #f39c12; font-weight: bold;">[系統] 快取同步已於背景執行，您可以關閉此面板。</span>`;
                        if (scrollTarget) scrollTarget.scrollTop = scrollTarget.scrollHeight;
                    }
                }, 8000);

                await streamPromise;

            } catch (syncErr) {
                console.error("同步設定失敗:", syncErr);
                document.getElementById('btn-side-close').style.display = 'inline-block';
            }
        } else {
            currentEditIsSuccess = false; 
        }

    } catch (error) {
        document.getElementById('btn-side-close').style.display = 'inline-block';
        document.getElementById('side-pane-title').innerHTML = '❌ 連線錯誤';
        document.getElementById('side-pane-title').style.color = '#ff6b6b';
        logContainer.innerHTML += `<div style="color: #ff6b6b; font-weight: bold; margin-top: 10px;">連線或伺服器錯誤: ${error}</div>`;
    }
}

// ==========================================
// 5. 輔助 UI 函數
// ==========================================
function initResizer() {
    const resizer = document.getElementById('drag-resizer');
    const leftPanes = document.querySelectorAll('.tree-view-instance');
    const rightPane = document.getElementById('side-cli-preview');
    const container = document.getElementById('split-container');
    let isResizing = false;

    resizer.addEventListener('mousedown', (e) => {
        isResizing = true;
        document.body.style.cursor = 'col-resize';
        document.body.style.userSelect = 'none'; 
    });

    document.addEventListener('mousemove', (e) => {
        if (!isResizing) return;
        const containerRect = container.getBoundingClientRect();
        let newLeftWidth = e.clientX - containerRect.left;
        const minWidth = containerRect.width * 0.2;
        const maxWidth = containerRect.width * 0.8;
        if (newLeftWidth < minWidth) newLeftWidth = minWidth;
        if (newLeftWidth > maxWidth) newLeftWidth = maxWidth;
        
        const leftPercentage = (newLeftWidth / containerRect.width) * 100;
        const rightPercentage = 100 - leftPercentage;
        leftPanes.forEach(pane => pane.style.width = `calc(${leftPercentage}% - 11px)`);
        rightPane.style.width = `calc(${rightPercentage}% - 11px)`;
    });

    document.addEventListener('mouseup', () => {
        if (isResizing) {
            isResizing = false;
            document.body.style.cursor = 'default';
            document.body.style.userSelect = 'auto'; 
        }
    });
}

function highlightTerminalOutput(text) {
    if (!text) return '';
    const lines = text.split('\n');
    const formattedLines = lines.map(line => {
        if (line.match(/(Aborted|Error|Warning|Failed|% Invalid|% Unknown|Bad command)/i)) {
            return `<span style="color: #ff6b6b; font-weight: bold;">${line}</span>`;
        }
        return line; 
    });
    return formattedLines.join('\n');
}

function transformNoToActive(elementId, newCommand) {
    const wrapper = document.getElementById(`display-wrapper-${elementId}`);
    if (!wrapper) return;

    const parts = newCommand.trim().split(' ');
    const firstWord = parts[0]; 
    const restCommand = parts.slice(1).join(' '); 

    const safeRestCommand = escapeHTML(restCommand);

    const svgEnabled = `<svg width="16" height="16" viewBox="0 0 24 24" fill="#27ae60"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8-3.58 8-8 8zM8.29 11.59L7 12.88l4 4 8-8-1.29-1.29L11 14.18z"/></svg>`;
    const iconHtml = `<span style="margin-right: 6px; display: inline-flex; align-items: center; justify-content: center; width: 18px; height: 18px;">${svgEnabled}</span>`;

    wrapper.innerHTML = `
        ${iconHtml}
        <b style="color: #2c3e50;">${firstWord}</b> 
        <span class="leaf-container" style="display: inline-flex; align-items: center; min-height: 24px;">
            <span class="leaf-value" style="color: #16a085; margin-left: 5px; font-family: Courier New, monospace; display: inline-block; transform: translateY(1.5px);">${safeRestCommand}</span>
            <span style="font-size: 0.8em; color: #f39c12; margin-left: 10px; border: 1px solid #f39c12; padding: 2px 6px; border-radius: 4px; background-color: #fffdf7;">(已啟用，重整後歸檔)</span>
        </span>
    `;
    
    const actionBtns = document.getElementById(`actions-${elementId}`);
    const editBtn = document.getElementById(`edit-btn-${elementId}`);
    if (actionBtns) actionBtns.style.display = 'none';
    if (editBtn) editBtn.style.display = 'none';
}

// ============================================================================
// 💻 開發者工具：預覽節點完整指令 (唯讀 Debug 模式)
// ============================================================================
export async function previewNodeCLI(btnElement, rootPath) {
    let container = btnElement.closest('details');
    if (container) {
        const elementId = container.id.replace('details-', '');
        if (container.dataset.loaded !== 'true') {
            await window.lazyLoadFolder(elementId, false);
        }
    }
    const targetNode = container || btnElement.closest('.tree-leaf-node');
    if (!targetNode) return;

    const leafNodes = targetNode.querySelectorAll('.leaf-container');
    const interfaceGroups = {};

    leafNodes.forEach(node => {
        const path = node.getAttribute('data-path') || "";
        const val = node.getAttribute('data-original');
        if (!path) return;
        
        const parts = path.split('::');
        const paramName = parts.pop();
        let interfacePath = parts.join(' ').replace(/\s*\[\d+\]/g, '');

        if (!interfaceGroups[interfacePath]) {
            interfaceGroups[interfacePath] = [];
        }
        interfaceGroups[interfacePath].push({ param: paramName, val: val });
    });

    if (Object.keys(interfaceGroups).length === 0 && targetNode.classList.contains('tree-leaf-node')) {
        const singleNode = targetNode.querySelector('.leaf-container');
        if (singleNode) {
            const path = singleNode.getAttribute('data-path');
            const val = singleNode.getAttribute('data-original');
            const parts = path.split('::');
            const paramName = parts.pop();
            let interfacePath = parts.join(' ').replace(/\s*\[\d+\]/g, '');
            interfaceGroups[interfacePath] = [{ param: paramName, val: val }];
        }
    }

    if (Object.keys(interfaceGroups).length === 0) {
        return alert("此節點下沒有任何數值可供預覽！");
    }

    let cliLines = [];
    cliLines.push("! --- Read-Only Configuration Preview ---");
    for (const [interfacePath, params] of Object.entries(interfaceGroups)) {
        cliLines.push(`! Node: ${interfacePath || 'Global'}`);
        params.forEach(({param, val}) => {
            if (/^\[\d+\]$/.test(param)) {
                if (val) {
                    cliLines.push(interfacePath ? `${interfacePath} ${val}` : val);
                }
            } else if (param === 'no') {
                cliLines.push(interfacePath ? `${interfacePath} no ${val}` : `no ${val}`);
            } else {
                let line = interfacePath ? `${interfacePath} ${param}` : param;
                if (val) line += ` ${val}`;
                cliLines.push(line);
            }
        });
        cliLines.push("!");
    }
    const finalScript = cliLines.join('\n');
    
    showReadOnlyCliPreviewModal(finalScript, rootPath);
}

function showReadOnlyCliPreviewModal(cliScript, rootPath) {
    const leftPanes = document.querySelectorAll('.tree-view-instance');
    const resizer = document.getElementById('drag-resizer');
    const rightPane = document.getElementById('side-cli-preview');

    document.getElementById('side-pane-title').innerHTML = `🔍 [唯讀預覽] ${rootPath}`;
    document.getElementById('side-pane-title').style.color = '#3498db';

    document.getElementById('btn-side-confirm').style.display = 'none';
    document.getElementById('btn-side-cancel').style.display = 'none';
    const closeBtn = document.getElementById('btn-side-close');
    closeBtn.style.display = 'inline-block';
    closeBtn.textContent = '關閉預覽';

    const textarea = document.getElementById('side-cli-textarea');
    textarea.style.display = 'block';
    textarea.value = cliScript;
    textarea.readOnly = true; 
    textarea.style.backgroundColor = '#2c3e50'; 

    document.getElementById('side-execution-result').style.display = 'none';

    // 🛡️ 安全修改：解除 Flexbox 均分限制，讓 JS 拖拉的 width 生效
    leftPanes.forEach(pane => {
        pane.style.flex = 'none';
        pane.style.maxWidth = 'none';
        pane.style.width = 'calc(50% - 11px)';
    });
    if (rightPane) {
        rightPane.style.flex = 'none';
        rightPane.style.maxWidth = 'none';
        rightPane.style.width = 'calc(50% - 11px)';
        rightPane.style.display = 'block';
    }
    
    if (resizer) resizer.style.display = 'flex';
    
    if (!window.isResizerInitialized && typeof initResizer === 'function') {
        initResizer();
        window.isResizerInitialized = true;
    }
}

// --- EOF (檔案結束) ---