// MeshDD-Bot – Shared page module
// Provides: initPage(), escapeHtml(), applyTheme()

// ── Sidebar definition ────────────────────────────────────────

const _SIDEBAR_LINKS = [
    { href: '/',          icon: 'bi-speedometer2',  label: 'Dashboard',    admin: false },
    { href: '/scheduler', icon: 'bi-clock-history', label: 'Scheduler',    admin: true  },
    { href: '/map',       icon: 'bi-map',           label: 'Karte',        admin: false },
    { href: '/packets',   icon: 'bi-reception-4',   label: 'Pakete',       admin: false },
    { href: '/settings',  icon: 'bi-gear',          label: 'Einstellungen',admin: true  },
    { href: '/admin',     icon: 'bi-people',        label: 'Benutzer',     admin: true  },
];

function _injectSidebar() {
    const sidebar = document.getElementById('sidebar');
    if (!sidebar) return;
    const currentPath = window.location.pathname;
    sidebar.innerHTML = '<nav class="sidebar-nav">' +
        _SIDEBAR_LINKS.map(link => {
            const active  = currentPath === link.href ? ' active' : '';
            const adm     = link.admin ? ' sidebar-admin' : '';
            return `<a href="${link.href}" class="sidebar-link${active}${adm}">` +
                   `<i class="bi ${link.icon}"></i><span>${link.label}</span></a>`;
        }).join('') +
    '</nav>';
}

// ── Navbar ────────────────────────────────────────────────────

function _updateNavbar(user) {
    const userMenu = document.getElementById('userMenu');
    const loginBtn = document.getElementById('loginBtn');
    const userName = document.getElementById('userName');
    if (user) {
        if (userName) userName.textContent = user.name;
        if (userMenu) userMenu.classList.remove('d-none');
        if (loginBtn) loginBtn.classList.add('d-none');
    } else {
        if (userMenu) userMenu.classList.add('d-none');
        if (loginBtn) loginBtn.classList.remove('d-none');
    }
}

function _updateSidebar(user) {
    const isAdmin = user && user.role === 'admin';
    document.querySelectorAll('.sidebar-admin').forEach(el => {
        el.style.display = isAdmin ? '' : 'none';
    });
}

// ── Theme ─────────────────────────────────────────────────────

function applyTheme(theme) {
    document.documentElement.setAttribute('data-bs-theme', theme);
    const icon = document.getElementById('themeIcon');
    if (icon) icon.className = theme === 'dark' ? 'bi bi-sun-fill' : 'bi bi-moon-fill';
    localStorage.setItem('theme', theme);
    document.dispatchEvent(new CustomEvent('themechange', { detail: { theme } }));
}

function _setupTheme() {
    applyTheme(localStorage.getItem('theme') || 'light');
    const btn = document.getElementById('themeToggle');
    if (btn) {
        btn.addEventListener('click', () => {
            const current = document.documentElement.getAttribute('data-bs-theme');
            applyTheme(current === 'dark' ? 'light' : 'dark');
        });
    }
}

// ── Sidebar toggle (mobile) ───────────────────────────────────

function _setupSidebarToggle() {
    const toggle   = document.getElementById('sidebarToggle');
    const sidebar  = document.getElementById('sidebar');
    const backdrop = document.getElementById('sidebarBackdrop');
    if (toggle && sidebar)   toggle.addEventListener('click',   () => sidebar.classList.toggle('open'));
    if (backdrop && sidebar) backdrop.addEventListener('click', () => sidebar.classList.remove('open'));
}

// ── Utilities ─────────────────────────────────────────────────

function escapeHtml(str) {
    if (!str) return '';
    const div = document.createElement('div');
    div.textContent = str;
    return div.innerHTML;
}

// ── Public init ───────────────────────────────────────────────

function _injectFooter(version) {
    const footer = document.getElementById('pageFooter');
    if (!footer) return;
    const now = new Date();
    const mm = String(now.getMonth() + 1).padStart(2, '0');
    const yyyy = now.getFullYear();
    const ver = version ? ` · v${version}` : '';
    footer.textContent = `© MeshDD / PPfeiffer${ver} · ${mm}/${yyyy}`;
}

function initPage({ onAuth = null } = {}) {
    _injectSidebar();
    _setupTheme();
    fetch('/api/auth/me')
        .then(r => r.ok ? r.json() : null)
        .then(user => {
            _updateNavbar(user);
            _updateSidebar(user);
            _setupSidebarToggle();
            if (onAuth) onAuth(user);
        });
    const vl = document.getElementById('versionLabel');
    fetch('/api/stats')
        .then(r => r.ok ? r.json() : null)
        .then(d => {
            if (d?.version && vl) vl.textContent = `v${d.version}`;
            _injectFooter(d?.version);
        });
}