/**
 * Admin Users Page
 * Manage users with LDAP-aware editing and Office assignment
 */

let currentUser = null;
let users = [];
let offices = [];
let currentSort = { column: 'name', direction: 'asc' };

document.addEventListener('DOMContentLoaded', async () => {
    currentUser = await api.requireAuth();
    if (!currentUser) return;

    if (currentUser.role !== 'admin') {
        window.location.href = '/presence';
        return;
    }

    await loadOffices();
    await loadUsers();
    setupEventListeners();
});

async function loadOffices() {
    const response = await api.get('/api/offices');
    if (response && response.ok) {
        offices = await response.json();
    }
}

async function loadUsers() {
    const response = await api.get('/api/users');
    if (response && response.ok) {
        users = await response.json();
        renderUsers();
    }
}

function renderUsers(filter = '') {
    const tbody = document.getElementById('usersBody');
    const filterLower = filter.toLowerCase();

    let filtered = users;
    if (filter) {
        filtered = users.filter(u =>
            (u.name || '').toLowerCase().includes(filterLower) ||
            (u.email || '').toLowerCase().includes(filterLower) ||
            (u.role || '').toLowerCase().includes(filterLower) ||
            (u.office_name || '').toLowerCase().includes(filterLower)
        );

    }

    // Sort
    filtered.sort((a, b) => {
        let valA = a[currentSort.column];
        let valB = b[currentSort.column];

        // Handle nulls for ratio
        if (currentSort.column === 'parking_ratio') {
            valA = valA !== null ? valA : 999; // Null ratio (new users) -> low priority? No, new users have ratio 0. 
            // Actually get_user_parking_ratio returns 0.0 for new users. 
            // If office_id is missing, it's None. Treat as high val to push to bottom?
            valA = (valA === undefined || valA === null) ? 999 : valA;
            valB = (valB === undefined || valB === null) ? 999 : valB;
        } else {
            valA = (valA || '').toString().toLowerCase();
            valB = (valB || '').toString().toLowerCase();
        }

        if (valA < valB) return currentSort.direction === 'asc' ? -1 : 1;
        if (valA > valB) return currentSort.direction === 'asc' ? 1 : -1;
        return 0;
    });

    // Update icons
    document.querySelectorAll('th.sortable .sort-icon').forEach(icon => icon.textContent = '');
    const activeTh = document.querySelector(`th[data-sort="${currentSort.column}"]`);
    if (activeTh) {
        const icon = activeTh.querySelector('.sort-icon');
        if (icon) icon.textContent = currentSort.direction === 'asc' ? ' ▲' : ' ▼';
    }

    if (filtered.length === 0) {
        tbody.innerHTML = '<tr><td colspan="5" class="text-center">Nessun utente trovato</td></tr>';
        return;
    }

    tbody.innerHTML = filtered.map(user => {
        const ldapBadge = user.is_ldap_user ? '<span class="badge badge-info">LDAP</span>' : '';
        const officeInfo = user.office_name || '-';

        return `
            <tr>
                <td>${user.name || '-'} ${ldapBadge}</td>
                <td>${user.email}</td>
                <td><span class="badge badge-${getRoleBadgeClass(user.role)}">${user.role}</span></td>
                <td>${officeInfo}</td>
                <td>${user.parking_ratio !== null ? user.parking_ratio.toFixed(2) : '-'}</td>
                <td>
                    <button class="btn btn-sm btn-secondary" onclick="editUser('${user.id}')">Modifica</button>
                    <button class="btn btn-sm btn-danger" onclick="deleteUser('${user.id}')" ${user.id === currentUser.id ? 'disabled' : ''}>Elimina</button>
                </td>
            </tr>
        `;
    }).join('');
}

function getRoleBadgeClass(role) {
    switch (role) {
        case 'admin': return 'danger';
        case 'manager': return 'warning';
        default: return 'secondary';
    }
}

async function editUser(userId) {
    const user = users.find(u => u.id === userId);
    if (!user) return;

    // Populate form
    document.getElementById('userId').value = user.id;
    document.getElementById('editName').value = user.name || '';
    document.getElementById('editEmail').value = user.email;
    document.getElementById('editRole').value = user.role;

    // Populate office dropdown
    const officeSelect = document.getElementById('editOffice');
    officeSelect.innerHTML = '<option value="">Nessun ufficio</option>';
    offices.forEach(o => {
        const option = document.createElement('option');
        option.value = o.id;
        option.textContent = o.name;
        if (o.id === user.office_id) option.selected = true;
        officeSelect.appendChild(option);
    });

    // Handle LDAP restrictions
    const isLdap = user.is_ldap_user;
    const isLdapAdmin = user.is_ldap_admin;

    // LDAP notice
    document.getElementById('ldapNotice').style.display = isLdap ? 'block' : 'none';

    // Name field - disabled for LDAP users
    const nameInput = document.getElementById('editName');
    nameInput.disabled = isLdap;
    document.getElementById('nameHelp').style.display = isLdap ? 'block' : 'none';

    // Role field - admin option disabled for LDAP admins (they can't be demoted)
    const roleSelect = document.getElementById('editRole');
    roleSelect.disabled = isLdapAdmin;
    document.getElementById('roleHelp').style.display = isLdapAdmin ? 'block' : 'none';

    document.getElementById('userModalTitle').textContent = 'Modifica Utente';
    document.getElementById('userModal').style.display = 'flex';
}

async function deleteUser(userId) {
    const user = users.find(u => u.id === userId);
    if (!user) return;

    if (!confirm(`Eliminare l'utente "${user.name || user.email}"?`)) return;

    const response = await api.delete(`/api/users/${userId}`);
    if (response && response.ok) {
        utils.showMessage('Utente eliminato', 'success');
        await loadUsers();
    } else {
        const error = await response.json();
        utils.showMessage(error.detail || 'Impossibile eliminare l\'utente', 'error');
    }
}

function setupEventListeners() {
    // Search
    document.getElementById('searchInput').addEventListener('input', (e) => {
        renderUsers(e.target.value);
    });

    // Modal close
    document.getElementById('closeUserModal').addEventListener('click', () => {
        document.getElementById('userModal').style.display = 'none';
    });
    document.getElementById('cancelUser').addEventListener('click', () => {
        document.getElementById('userModal').style.display = 'none';
    });
    utils.setupModalClose('userModal');

    // Form submit
    document.getElementById('userForm').addEventListener('submit', async (e) => {
        e.preventDefault();

        const userId = document.getElementById('userId').value;
        const role = document.getElementById('editRole').value;

        const data = {
            role: role,
            office_id: document.getElementById('editOffice').value || null
        };

        // Only include name if not disabled (LDAP users can't change name)
        const nameInput = document.getElementById('editName');
        if (!nameInput.disabled) {
            data.name = nameInput.value;
        }

        const response = await api.put(`/api/users/${userId}`, data);
        if (response && response.ok) {
            document.getElementById('userModal').style.display = 'none';
            utils.showMessage('Utente aggiornato', 'success');
            await loadUsers();
        } else {
            const error = await response.json();
            utils.showMessage(error.detail || 'Impossibile aggiornare l\'utente', 'error');
        }
    });


    // Sort headers
    document.querySelectorAll('th.sortable').forEach(th => {
        th.addEventListener('click', () => {
            const column = th.dataset.sort;
            if (currentSort.column === column) {
                currentSort.direction = currentSort.direction === 'asc' ? 'desc' : 'asc';
            } else {
                currentSort.column = column;
                currentSort.direction = 'asc';
            }
            renderUsers(document.getElementById('searchInput').value);
        });
    });
}

// Make functions available globally for onclick handlers
window.editUser = editUser;
window.deleteUser = deleteUser;