/**
 * app.js — 应用主控
 * 路由调度、页面生命周期管理、WebSocket 数据分发
 */
var App = (function() {
    var currentPage = null;
    var currentHash = '';
    var pages = {};

    /* ---- 页面注册 ---- */
    function registerPage(hash, page) {
        pages[hash] = page;
    }

    /* ---- 侧边栏导航 ---- */
    var navLinks = [
        { hash: '#dashboard', label: '🏠 功能导航' },
        { hash: '#out',       label: '📡 注册 (out)' },
        { hash: '#in',        label: '📊 链接注册 (in)' },
        { hash: '#yk',        label: '⚡ 遥控 (yk)' },
        { hash: '#ao',        label: '🔧 参数 (ao)' },
        { hash: '#param',     label: '⚙ 定值 (param)' },
        { hash: '#monitor',   label: '📋 数据监控' }
    ];

    function buildNav() {
        var nav = document.getElementById('nav-links');
        if (!nav) return;
        var html = '';
        for (var i = 0; i < navLinks.length; i++) {
            var link = navLinks[i];
            html += '<a href="' + link.hash + '" data-hash="' + link.hash + '">' + link.label + '</a>';
        }
        nav.innerHTML = html;
    }

    function updateNavActive(hash) {
        var links = document.querySelectorAll('#nav-links a');
        for (var i = 0; i < links.length; i++) {
            var linkHash = links[i].getAttribute('data-hash');
            if (linkHash === hash) {
                links[i].classList.add('active');
            } else {
                links[i].classList.remove('active');
            }
        }
    }

    function showSidebar(show) {
        var sidebar = document.getElementById('nav-sidebar');
        if (sidebar) {
            sidebar.style.display = show ? 'flex' : 'none';
        }
        var main = document.getElementById('main-content');
        if (main) {
            main.style.marginLeft = show ? '220px' : '0';
        }
    }

    /* ---- WS 状态更新 ---- */
    function updateWsStatus(status) {
        var dot = document.getElementById('nav-status-dot');
        var text = document.getElementById('nav-status-text');
        if (dot) {
            dot.className = 'nav-status-dot ' + status;
        }
        if (text) {
            var map = { connected: '已连接', disconnected: '已断开', connecting: '连接中...' };
            text.textContent = map[status] || status;
        }
    }

    /* ---- 路由调度 ---- */
    function dispatch(hash) {
        // 未登录 → 跳转到 login
        if (hash !== '#login' && !localStorage.getItem('rtu_logged_in')) {
            window.location.hash = '#login';
            return;
        }

        // 已登录但访问 login → 跳转到 dashboard
        if (hash === '#login' && localStorage.getItem('rtu_logged_in')) {
            window.location.hash = '#dashboard';
            return;
        }

        if (hash === currentHash && currentPage) return;

        var container = document.getElementById('page-container');
        if (!container) return;

        // 离开旧页面
        if (currentPage && currentPage.onLeave) {
            currentPage.onLeave();
        }

        // 渲染新页面
        var page = pages[hash];
        if (!page) {
            // 默认跳转到 login
            window.location.hash = '#login';
            return;
        }

        container.innerHTML = '';
        page.render(container);

        if (page.onEnter) {
            page.onEnter();
        }

        // 页面进入后立即推送缓存数据（如有）
        var stMap = { '#out': 'out', '#in': 'in', '#yk': 'yk', '#ao': 'ao', '#param': 'param' };
        var st = stMap[hash];
        if (st && page.onData && lastDataCache[st]) {
            page.onData(lastDataCache[st]);
        }

        currentPage = page;
        currentHash = hash;

        // 更新导航
        updateNavActive(hash);

        // 登录页隐藏侧边栏
        if (hash === '#login') {
            showSidebar(false);
            document.body.classList.add('login-page');
        } else {
            showSidebar(true);
            document.body.classList.remove('login-page');
        }
    }

    /* ---- 数据缓存：保留每种信号类型的最后数据，切换页面时立即恢复 ---- */
    var lastDataCache = {};

    /* ---- WS 下行数据分发 ---- */
    function onWsMessage(data, raw) {
        if (!data || typeof data !== 'object') return;

        var signalTypes = ['out', 'in', 'yk', 'ao', 'param'];
        for (var i = 0; i < signalTypes.length; i++) {
            var st = signalTypes[i];
            if (data[st]) {
                lastDataCache[st] = data[st];
            }
        }

        // 仅向当前页面推送对应类型的数据
        var signalTypeMap = {
            '#out': 'out',
            '#in': 'in',
            '#yk': 'yk',
            '#ao': 'ao',
            '#param': 'param'
        };

        var signalType = signalTypeMap[currentHash];
        if (signalType && currentPage && currentPage.onData && data[signalType]) {
            currentPage.onData(data[signalType]);
        }
    }

    /* ---- 初始化 ---- */
    function init() {
        // 注册页面
        registerPage('#login', LoginPage);
        registerPage('#dashboard', DashboardPage);
        registerPage('#out', OutPage);
        registerPage('#in', InPage);
        registerPage('#yk', YkPage);
        registerPage('#ao', AoPage);
        registerPage('#param', ParamPage);
        registerPage('#monitor', MonitorPage);

        // 构建导航
        buildNav();

        // 初始化 WebSocket
        var wsUrl = (location.protocol === 'https:' ? 'wss:' : 'ws:') + '//' + location.host + '/ws';
        WsClient.connect(wsUrl);

        // 监听 WS 状态
        WsClient.onStatusChange(function(status) {
            updateWsStatus(status);
        });

        // 监听 WS 下行消息
        WsClient.onMessage(function(data, raw) {
            onWsMessage(data, raw);
        });

        // 路由变化
        window.addEventListener('hashchange', function() {
            var hash = window.location.hash || '#login';
            dispatch(hash);
        });

        // 登出按钮
        var logoutBtn = document.getElementById('nav-logout');
        if (logoutBtn) {
            logoutBtn.onclick = function() {
                localStorage.removeItem('rtu_logged_in');
                window.location.hash = '#login';
            };
        }

        // 首次加载
        var initHash = window.location.hash || '#login';
        dispatch(initHash);
    }

    return {
        init: init,
        dispatch: dispatch
    };
})();

// 页面加载完成后启动
document.addEventListener('DOMContentLoaded', function() {
    App.init();
});