(function () {
    const actionMap = {
        'new-ppr': "openNewPPRModal",
        'book-out': "openLocalFlightModal",
        'book-in': "openBookInModal",
        overflight: "openOverflightModal",
        'user-aircraft': "openUserAircraftModal",
        'user-management': "openUserManagementModal"
    };

    function injectTopbarStyles() {
        if (document.getElementById('shared-topbar-styles')) return;

        const style = document.createElement('style');
        style.id = 'shared-topbar-styles';
        style.textContent = `
            .top-bar {
                background: linear-gradient(135deg, #2c3e50, #3498db);
                color: white;
                padding: 0.5rem 2rem;
                display: flex;
                justify-content: center;
                align-items: center;
                gap: 2rem;
                box-shadow: 0 2px 10px rgba(0,0,0,0.1);
                position: relative;
                z-index: 100;
            }
            .top-bar .title { order: 2; flex: 1; text-align: center; }
            .top-bar .title h1 { margin: 0; font-size: 1.5rem; }
            .top-bar .menu-buttons {
                order: 1;
                display: flex;
                gap: 1rem;
                align-items: center;
                flex-wrap: wrap;
            }
            .top-bar .user-info {
                order: 3;
                font-size: 0.9rem;
                opacity: 0.9;
                display: flex;
                align-items: center;
                gap: 0.3rem;
            }
            .top-bar .btn {
                padding: 0.7rem 1.5rem;
                border: none;
                border-radius: 5px;
                cursor: pointer;
                font-size: 0.9rem;
                font-weight: 500;
                text-decoration: none;
                display: inline-block;
            }
            .top-bar .btn-success { background-color: #27ae60; color: white; }
            .top-bar .btn-warning { background-color: #f39c12; color: white; }
            .dropdown { position: relative; display: inline-block; }
            .dropdown-toggle { white-space: nowrap; }
            .dropdown-menu {
                display: none;
                position: absolute;
                background-color: white;
                min-width: 220px;
                box-shadow: 0 8px 16px rgba(0,0,0,0.2);
                border-radius: 5px;
                z-index: 1000;
                top: 100%;
                left: 0;
                margin-top: 0.5rem;
                padding: 0;
            }
            .dropdown-menu.active { display: block; }
            .dropdown-menu a {
                color: #333;
                padding: 0.75rem 1.2rem;
                text-decoration: none;
                display: flex;
                justify-content: space-between;
                align-items: center;
                gap: 1rem;
                transition: background-color 0.2s ease;
                white-space: nowrap;
            }
            .dropdown-menu a:hover { background-color: #f5f5f5; }
            .dropdown-menu a:first-child { border-radius: 5px 5px 0 0; }
            .dropdown-menu a:last-child { border-radius: 0 0 5px 5px; }
            .shortcut { font-size: 0.8rem; color: #999; margin-left: 1rem; }
        `;
        document.head.appendChild(style);
    }

    function actionLink(label, action, shortcut, id = '') {
        const shortcutText = shortcut ? `<span class="shortcut">(${shortcut})</span>` : '';
        const idAttr = id ? ` id="${id}"` : '';
        const hidden = id === 'user-management-dropdown' ? ' style="display: none;"' : '';
        return `<a href="#" data-topbar-action="${action}"${idAttr}${hidden}>${label} ${shortcutText}</a>`;
    }

    function navLink(label, href) {
        return `<a href="${href}">${label}</a>`;
    }

    function normalizeTopbar() {
        const topbar = document.querySelector('.top-bar');
        if (!topbar || topbar.dataset.sharedTopbar === 'true') return;

        injectTopbarStyles();

        const existingTitle = topbar.querySelector('#tower-title, .title h1, h1');
        const path = window.location.pathname.replace(/\/$/, '') || '/';
        const titleByPath = {
            '/admin': '✈️ Swansea Tower',
            '/atc': '✈️ Swansea Tower - ATC View',
            '/reports': '📊 PPR Reports',
            '/movements': '📈 Movements',
            '/drone-requests': 'Drone Requests',
            '/bulk-log': '🧾 Bulk Flight Log',
            '/journal': '📔 Journal Log'
        };
        const titleText = titleByPath[path] || (existingTitle ? existingTitle.textContent.trim() : 'Tower Ops');
        const existingUser = topbar.querySelector('#current-user');
        const username = existingUser ? existingUser.textContent.trim() : 'Loading...';

        topbar.dataset.sharedTopbar = 'true';
        topbar.innerHTML = `
            <div class="title">
                <h1 id="tower-title">${titleText}</h1>
            </div>
            <div class="menu-buttons">
                <div class="dropdown">
                    <button class="btn btn-success dropdown-toggle" id="actionsDropdownBtn">📋 Actions</button>
                    <div class="dropdown-menu" id="actionsDropdownMenu">
                        ${actionLink('➕ New PPR', 'new-ppr', 'N')}
                        ${actionLink('🛫 Book Out', 'book-out', 'L')}
                        ${actionLink('🛬 Book In', 'book-in', 'I')}
                        ${actionLink('🔄 Overflight', 'overflight', 'O')}
                    </div>
                </div>
                <div class="dropdown">
                    <button class="btn btn-warning dropdown-toggle" id="adminDropdownBtn">⚙️ Menu</button>
                    <div class="dropdown-menu" id="adminDropdownMenu">
                        ${navLink('🏠 Admin View', '/admin')}
                        ${navLink('🎛️ ATC View', '/atc')}
                        ${navLink('📊 Reports', '/reports')}
                        ${navLink('🛸 Drone Requests', '/drone-requests')}
                        ${navLink('📔 Journal Log', '/journal')}
                        ${actionLink('✈️ User Aircraft', 'user-aircraft', '', 'user-aircraft-dropdown')}
                        ${actionLink('👥 User Management', 'user-management', '', 'user-management-dropdown')}
                    </div>
                </div>
            </div>
            <div class="user-info">
                Logged in as: <span id="current-user">${username || 'Loading...'}</span> |
                <a href="#" data-topbar-logout style="color: white;">Logout</a>
            </div>
        `;
    }

    function closeDropdowns(except = null) {
        document.querySelectorAll('.dropdown-menu.active').forEach(menu => {
            if (menu !== except) menu.classList.remove('active');
        });
    }

    function runAction(action) {
        const fnName = actionMap[action];
        if (fnName && typeof window[fnName] === 'function') {
            if (action === 'book-out') {
                window[fnName]('LOCAL');
            } else {
                window[fnName]();
            }
            return;
        }

        window.location.href = `/admin?action=${encodeURIComponent(action)}`;
    }

    function handleDeferredAction() {
        const params = new URLSearchParams(window.location.search);
        const action = params.get('action');
        if (!action) return;

        window.setTimeout(() => {
            runAction(action);
            const cleanUrl = window.location.pathname + window.location.hash;
            window.history.replaceState({}, document.title, cleanUrl);
        }, 300);
    }

    async function updateRoleVisibility() {
        const token = localStorage.getItem('ppr_access_token');
        const userManagement = document.getElementById('user-management-dropdown');
        const userAircraft = document.getElementById('user-aircraft-dropdown');

        if (!token || (!userManagement && !userAircraft)) return;

        try {
            const response = await fetch('/api/v1/auth/test-token', {
                method: 'POST',
                headers: { 'Authorization': `Bearer ${token}` }
            });
            if (!response.ok) return;

            const user = await response.json();
            const role = (user.role || '').toUpperCase();
            if (role === 'ADMINISTRATOR') {
                if (userManagement) userManagement.style.display = 'flex';
                if (userAircraft) userAircraft.style.display = 'flex';
            } else if (role === 'OPERATOR') {
                if (userManagement) userManagement.style.display = 'none';
                if (userAircraft) userAircraft.style.display = 'flex';
            } else {
                if (userManagement) userManagement.style.display = 'none';
                if (userAircraft) userAircraft.style.display = 'none';
            }
        } catch (error) {
            if (userManagement) userManagement.style.display = 'none';
        }
    }

    document.addEventListener('click', event => {
        const toggle = event.target.closest('.dropdown-toggle');
        const action = event.target.closest('[data-topbar-action]');
        const logout = event.target.closest('[data-topbar-logout]');

        if (toggle) {
            event.preventDefault();
            event.stopImmediatePropagation();
            const menu = toggle.parentElement.querySelector('.dropdown-menu');
            const willOpen = !menu.classList.contains('active');
            closeDropdowns(menu);
            menu.classList.toggle('active', willOpen);
            return;
        }

        if (action) {
            event.preventDefault();
            event.stopImmediatePropagation();
            closeDropdowns();
            runAction(action.dataset.topbarAction);
            return;
        }

        if (logout) {
            event.preventDefault();
            event.stopImmediatePropagation();
            if (typeof window.logout === 'function') {
                window.logout();
            } else {
                localStorage.removeItem('ppr_access_token');
                localStorage.removeItem('ppr_username');
                localStorage.removeItem('ppr_token_expiry');
                window.location.href = '/admin';
            }
            return;
        }

        if (!event.target.closest('.dropdown')) {
            closeDropdowns();
        }
    });

    document.addEventListener('DOMContentLoaded', () => {
        normalizeTopbar();
        updateRoleVisibility();
        handleDeferredAction();
    });
})();