/**
 * Admin Users Page
 * Manage all users in the system
 */

let currentUser = null;
let users = [];
let offices = [];
let managedOfficesMap = {}; // user_id -> [office_ids]

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

    currentUser = await api.getCurrentUser();
    if (!currentUser) return;

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

    await Promise.all([loadUsers(), loadOffices()]);
    await loadManagedOffices();
    renderUsers();
    setupEventListeners();
});

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

async function loadOffices() {
    const response = await api.get('/api/offices');
    if (response && response.ok) {
        offices = await response.json();
        const select = document.getElementById('editOffice');
        offices.forEach(office => {
            const option = document.createElement('option');
            option.value = office.id;
            option.textContent = office.name;
            select.appendChild(option);
        });
    }
}

async function loadManagedOffices() {
    // Load managed offices for all managers
    const response = await api.get('/api/offices/managers/list');
    if (response && response.ok) {
        const managers = await response.json();
        managedOfficesMap = {};
        managers.forEach(m => {
            managedOfficesMap[m.id] = m.offices.map(o => o.id);
        });
    }
}

function getManagedOfficeNames(userId) {
    const officeIds = managedOfficesMap[userId] || [];
    if (officeIds.length === 0) return '-';
    return officeIds.map(id => {
        const office = offices.find(o => o.id === id);
        return office ? office.name : id;
    }).join(', ');
}

function renderUsers(filter = '') {
    const tbody = document.getElementById('usersBody');
    const filtered = filter
        ? users.filter(u =>
            u.name.toLowerCase().includes(filter.toLowerCase()) ||
            u.email.toLowerCase().includes(filter.toLowerCase())
        )
        : users;

    if (filtered.length === 0) {
        tbody.innerHTML = '<tr><td colspan="8" class="text-center">No users found</td></tr>';
        return;
    }

    tbody.innerHTML = filtered.map(user => {
        const office = offices.find(o => o.id === user.office_id);
        const isManager = user.role === 'manager';
        const managedOffices = isManager ? getManagedOfficeNames(user.id) : '-';
        return `
            <tr>
                <td>${user.name}</td>
                <td>${user.email}</td>
                <td><span class="badge badge-${user.role}">${user.role}</span></td>
                <td>${office ? office.name : '-'}</td>
                <td>${managedOffices}</td>
                <td>${isManager ? (user.manager_parking_quota || 0) : '-'}</td>
                <td>${isManager ? (user.manager_spot_prefix || '-') : '-'}</td>
                <td>
                    <button class="btn btn-sm btn-secondary" onclick="editUser('${user.id}')">Edit</button>
                    ${user.id !== currentUser.id ? `
                        <button class="btn btn-sm btn-danger" onclick="deleteUser('${user.id}')">Delete</button>
                    ` : ''}
                </td>
            </tr>
        `;
    }).join('');
}

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

    document.getElementById('userId').value = user.id;
    document.getElementById('editName').value = user.name;
    document.getElementById('editEmail').value = user.email;
    document.getElementById('editRole').value = user.role;
    document.getElementById('editOffice').value = user.office_id || '';
    document.getElementById('editQuota').value = user.manager_parking_quota || 0;
    document.getElementById('editPrefix').value = user.manager_spot_prefix || '';

    const isManager = user.role === 'manager';

    // Show/hide manager fields based on role
    document.getElementById('quotaGroup').style.display = isManager ? 'block' : 'none';
    document.getElementById('prefixGroup').style.display = isManager ? 'block' : 'none';
    document.getElementById('managedOfficesGroup').style.display = isManager ? 'block' : 'none';

    // Build managed offices checkboxes
    const checkboxContainer = document.getElementById('managedOfficesCheckboxes');
    const userManagedOffices = managedOfficesMap[userId] || [];
    checkboxContainer.innerHTML = offices.map(office => `
        <label class="checkbox-label">
            <input type="checkbox" name="managedOffice" value="${office.id}"
                ${userManagedOffices.includes(office.id) ? 'checked' : ''}>
            ${office.name}
        </label>
    `).join('');

    document.getElementById('userModal').style.display = 'flex';
}

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

    if (!confirm(`Delete user "${user.name}"? This cannot be undone.`)) return;

    const response = await api.delete(`/api/users/${userId}`);
    if (response && response.ok) {
        await loadUsers();
        await loadManagedOffices();
        renderUsers();
        utils.showMessage('User deleted', 'success');
    } else {
        const error = await response.json();
        utils.showMessage(error.detail || 'Failed to delete user', 'error');
    }
}

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

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

    document.getElementById('cancelUser').addEventListener('click', () => {
        document.getElementById('userModal').style.display = 'none';
    });

    // Role change shows/hides manager fields
    document.getElementById('editRole').addEventListener('change', (e) => {
        const isManager = e.target.value === 'manager';
        document.getElementById('quotaGroup').style.display = isManager ? 'block' : 'none';
        document.getElementById('prefixGroup').style.display = isManager ? 'block' : 'none';
        document.getElementById('managedOfficesGroup').style.display = isManager ? 'block' : 'none';
    });

    // 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 = {
            name: document.getElementById('editName').value,
            role: role,
            office_id: document.getElementById('editOffice').value || null
        };

        if (role === 'manager') {
            data.manager_parking_quota = parseInt(document.getElementById('editQuota').value) || 0;
            data.manager_spot_prefix = document.getElementById('editPrefix').value.toUpperCase() || null;
        }

        const response = await api.put(`/api/users/${userId}`, data);
        if (response && response.ok) {
            // Update managed offices if manager
            if (role === 'manager') {
                await updateManagedOffices(userId);
            }

            document.getElementById('userModal').style.display = 'none';
            await loadUsers();
            await loadManagedOffices();
            renderUsers();
            utils.showMessage('User updated', 'success');
        } else {
            const error = await response.json();
            utils.showMessage(error.detail || 'Failed to update user', 'error');
        }
    });

    utils.setupModalClose('userModal');
}

async function updateManagedOffices(userId) {
    // Get currently selected offices
    const checkboxes = document.querySelectorAll('input[name="managedOffice"]:checked');
    const selectedOfficeIds = Array.from(checkboxes).map(cb => cb.value);

    // Get current managed offices
    const currentOfficeIds = managedOfficesMap[userId] || [];

    // Find offices to add and remove
    const toAdd = selectedOfficeIds.filter(id => !currentOfficeIds.includes(id));
    const toRemove = currentOfficeIds.filter(id => !selectedOfficeIds.includes(id));

    // Add new memberships
    for (const officeId of toAdd) {
        await api.post(`/api/offices/${officeId}/managers`, { user_id: userId });
    }

    // Remove old memberships
    for (const officeId of toRemove) {
        await api.delete(`/api/offices/${officeId}/managers/${userId}`);
    }
}

// Make functions globally accessible
window.editUser = editUser;
window.deleteUser = deleteUser;