// --- static/terminal.js ---

// 1. 從剛剛建立的 utils.js 引入工具
import { getGlobalConnectionInfo } from './utils.js';

// 2. 宣告終端機專用的變數
let term, fitAddon, ws;
export let isConnected = false; 

// 3. 終端機文字上色 (內部使用，不需要 export)
function colorizeTerminalStream(text) {
    let res = text;
    
    // 1. IP 地址：改為「柔和冰藍色」 (移除 1; 粗體)
    res = res.replace(/\b(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\b/g, '\x1b[38;5;111m$1\x1b[0m');
    
    // 2. MAC 地址：改為「柔和薰衣草紫」 (移除 1; 粗體)
    res = res.replace(/\b([0-9a-fA-F]{4}\.[0-9a-fA-F]{4}\.[0-9a-fA-F]{4}|[0-9a-fA-F]{2}(?::[0-9a-fA-F]{2}){5})\b/g, '\x1b[38;5;140m$1\x1b[0m');
    
    // 3. 正常狀態：維持「柔和薄荷綠」
    res = res.replace(/\b([a-z]-online|online|init\([^)]+\)|up|active|success|yes)\b/gi, '\x1b[38;5;114m$1\x1b[0m');
    
    // 4. 異常狀態：維持「柔和珊瑚紅」
    res = res.replace(/\b(offline|down|admin-down|error|fail|failed|shutdown|reject|invalid|no)\b/gi, '\x1b[38;5;204m$1\x1b[0m');
    
    // 5. 介面名稱 (Cable/RPD等)：改為「柔和奶油黃」 (原本是 \x1b[33m)
    res = res.replace(/\b(Cable|GigabitEthernet|TenGigabitEthernet|Upstream|Downstream|Mac-domain|bonding-group|rpd)\b/gi, '\x1b[38;5;179m$1\x1b[0m');
    
    return res;
}

// 4. 匯出 (export) 所有需要被外部呼叫的函數
export function initTerminal() {
    const container = document.getElementById('terminal-container');

    // ==========================================
    // 🛡️ DOM 防火牆：攔截殘缺的假鍵盤事件
    // ==========================================
    container.addEventListener('keydown', (e) => {
        // 如果這個事件物件沒有 getModifierState 函數 (代表它是外掛產生的假事件)
        if (typeof e.getModifierState !== 'function') {
            // 🛑 停止事件傳遞！不讓它流進 Xterm.js 裡
            e.stopPropagation();
        }
    }, true); // 🌟 關鍵：傳入 true 啟用「捕獲階段 (Capture Phase)」，確保我們比 Xterm.js 更早拿到事件
    // ==========================================
    
    term = new Terminal({ cursorBlink: true, theme: { background: '#1e1e1e', foreground: '#e0e0e0' }, fontFamily: 'Courier New, monospace', fontSize: 15, scrollback: 100000 });
    fitAddon = new FitAddon.FitAddon();
    term.loadAddon(fitAddon);
    term.open(document.getElementById('terminal-container'));
    fitAddon.fit();
    term.writeln('Welcome to Harmonic cOS Web Terminal.');
    term.writeln('Please confirm the target device above and click "連線至 CMTS"... \r\n');
    
    term.onData((data) => { 
        if (ws && ws.readyState === WebSocket.OPEN) ws.send(data); 
    });
}

export function connectWebSocket(resetCallback) {
    if (ws && ws.readyState === WebSocket.OPEN) return;
    const connInfo = getGlobalConnectionInfo();
    if (!connInfo) return;

    if (resetCallback) resetCallback(); // 呼叫 app.js 傳進來的重置函數

    term.writeln(`\x1b[33mConnecting to ${connInfo.host} via WebSocket...\x1b[0m`);
    const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
    const wsUrl = `${protocol}//${window.location.host}/ws/terminal?host=${encodeURIComponent(connInfo.host)}&username=${encodeURIComponent(connInfo.user)}&password=${encodeURIComponent(connInfo.pass)}`;
    
    ws = new WebSocket(wsUrl);

    ws.onopen = () => {
        isConnected = true; 
        const btnLoadTask = document.getElementById('btn-load-task');
        if (btnLoadTask) {
            btnLoadTask.disabled = false;
            btnLoadTask.style.backgroundColor = '#c0392b';
            btnLoadTask.style.cursor = 'pointer';
        }
        document.getElementById('wsStatus').textContent = `狀態：已連線`;
        document.getElementById('wsStatus').style.color = '#27ae60';
        document.getElementById('btnConnect').style.display = 'none';
        document.getElementById('btnDisconnect').style.display = 'inline-block';
        document.getElementById('cmtsHost').disabled = true;
        document.getElementById('cmtsUser').disabled = true;
        document.getElementById('cmtsPass').disabled = true;
        term.focus();

        // 🌟 原有：連線成功後，自動觸發一次查詢任務的 change 事件，讓背景預載 Datalist
        const queryTaskSelect = document.getElementById('queryTask');
        if (queryTaskSelect) {
            queryTaskSelect.dispatchEvent(new Event('change'));
        }

        // 🌟 新增：連線成功後，強制觸發配置任務切換，藉此啟動「正確 IP」的 SSE 監聽
        const configTaskSelect = document.getElementById('configTask');
        if (configTaskSelect) {
            configTaskSelect.dispatchEvent(new Event('change'));
        }
    };

    ws.onmessage = (event) => {
        term.write(colorizeTerminalStream(event.data));
    };

    ws.onclose = () => {
        isConnected = false; 
        const btnLoadTask = document.getElementById('btn-load-task');
        if (btnLoadTask) {
            btnLoadTask.disabled = true;
            btnLoadTask.style.backgroundColor = '#95a5a6';
            btnLoadTask.style.cursor = 'not-allowed';
        }
        document.getElementById('wsStatus').textContent = '狀態：已斷線';
        document.getElementById('wsStatus').style.color = '#c0392b';
        document.getElementById('btnConnect').style.display = 'inline-block';
        document.getElementById('btnDisconnect').style.display = 'none';
        document.getElementById('cmtsHost').disabled = false;
        document.getElementById('cmtsUser').disabled = false;
        document.getElementById('cmtsPass').disabled = false;
        term.writeln('\r\n\x1b[31m--- Connection Closed ---\x1b[0m\r\n');

        // 🌟 新增：斷線時，強制觸發配置任務切換，藉此「關閉」SSE 監聽
        const configTaskSelect = document.getElementById('configTask');
        if (configTaskSelect) {
            configTaskSelect.dispatchEvent(new Event('change'));
        }

        if (resetCallback) resetCallback();
    };
}

export function disconnectWebSocket() { if (ws) ws.close(); }

export function injectCommand() {
    if (!ws || ws.readyState !== WebSocket.OPEN) return alert("請先點擊「連線至 CMTS」！");
    const cmd = document.getElementById('fixedCmd').value;
    ws.send(cmd + '\r');
    term.focus();
}

export function getTerminalText() {
    if (!term) return '';
    try {
        if (term.hasSelection()) return term.getSelection();
        const buffer = term.buffer.active;
        let text = '';
        for (let i = 0; i < buffer.length; i++) {
            const line = buffer.getLine(i);
            if (line) text += line.translateToString(true) + '\n';
        }
        return text;
    } catch (err) {
        console.error("讀取終端機文字失敗:", err);
        return '';
    }
}

export function downloadTerminal() {
    const text = getTerminalText();
    if (!text.trim()) return alert("沒有內容可下載！");
    try {
        const blob = new Blob([text], { type: 'text/plain;charset=utf-8' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        const timestamp = new Date().toISOString().replace(/[:.]/g, '-').substring(0, 19);
        a.download = `cmts_terminal_log_${timestamp}.txt`;
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        URL.revokeObjectURL(url);
    } catch (err) {
        console.error("下載失敗:", err);
    }
}