// User management functionality

// Load users
async function loadUsers() {
    if (!config.isConfigured()) {
        showAlert('Please configure your API settings first.', 'warning');
        return;
    }

    const container = document.getElementById('usersContainer');
    container.innerHTML = '<div class="text-center"><div class="loading-spinner"></div> Loading users...</div>';

    try {
        const users = await apiClient.getUsers();
        displayUsers(users);
    } catch (error) {
        handleApiError(error, 'loading users');
        container.innerHTML = '<div class="alert alert-danger">Failed to load users</div>';
    }
}

// Display users
function displayUsers(users) {
    const container = document.getElementById('usersContainer');
    
    if (!users || users.length === 0) {
        container.innerHTML = `
            <div class="text-center py-5">
                <i class="fas fa-user fa-3x text-muted mb-3"></i>
                <h4>No users found</h4>
                <p class="text-muted">Create your first user to get started!</p>
                <button class="btn btn-primary" onclick="showCreateUserModal()">
                    <i class="fas fa-plus me-1"></i>Create User
                </button>
            </div>
        `;
        return;
    }

    const usersHtml = `
        <div class="table-responsive">
            <table class="table table-hover">
                <thead>
                    <tr>
                        <th>Name</th>
                        <th>Email</th>
                        <th>Team</th>
                        <th>Role</th>
                        <th>Created</th>
                        <th>Actions</th>
                    </tr>
                </thead>
                <tbody>
                    ${users.map(user => `
                        <tr>
                            <td>
                                <div class="d-flex align-items-center">
                                    <div class="avatar-circle me-2">
                                        ${user.name.charAt(0).toUpperCase()}
                                    </div>
                                    ${escapeHtml(user.name)}
                                </div>
                            </td>
                            <td>${escapeHtml(user.email)}</td>
                            <td>
                                <span class="badge bg-info" id="team-${user.team_id}">
                                    Loading...
                                </span>
                            </td>
                            <td>
                                <span class="badge ${user.is_admin ? 'bg-danger' : 'bg-secondary'}">
                                    ${user.is_admin ? 'Admin' : 'User'}
                                </span>
                            </td>
                            <td class="text-muted small">${formatDate(user.created_at)}</td>
                            <td>
                                <div class="btn-group" role="group">
                                    <button class="btn btn-sm btn-outline-primary" onclick="viewUser('${user.id}')">
                                        <i class="fas fa-eye"></i>
                                    </button>
                                    <button class="btn btn-sm btn-outline-secondary" onclick="editUser('${user.id}')">
                                        <i class="fas fa-edit"></i>
                                    </button>
                                    <button class="btn btn-sm btn-outline-danger" onclick="deleteUser('${user.id}')">
                                        <i class="fas fa-trash"></i>
                                    </button>
                                </div>
                            </td>
                        </tr>
                    `).join('')}
                </tbody>
            </table>
        </div>
    `;

    container.innerHTML = usersHtml;
    
    // Load team names
    loadTeamNames();
}

// Load team names for display
async function loadTeamNames() {
    try {
        const teams = await apiClient.getTeams();
        teams.forEach(team => {
            const teamBadges = document.querySelectorAll(`#team-${team.id}`);
            teamBadges.forEach(badge => {
                badge.textContent = team.name;
            });
        });
    } catch (error) {
        console.error('Failed to load team names:', error);
    }
}

// Show create user modal
async function showCreateUserModal() {
    try {
        const teams = await apiClient.getTeams();
        
        const modalBody = `
            <form id="createUserForm">
                <div class="mb-3">
                    <label for="userName" class="form-label">Full Name *</label>
                    <input type="text" class="form-control" id="userName" required>
                </div>
                <div class="mb-3">
                    <label for="userEmail" class="form-label">Email *</label>
                    <input type="email" class="form-control" id="userEmail" required>
                </div>
                <div class="mb-3">
                    <label for="userPassword" class="form-label">Password *</label>
                    <input type="password" class="form-control" id="userPassword" required>
                    <div class="form-text">Minimum 8 characters</div>
                </div>
                <div class="mb-3">
                    <label for="userTeam" class="form-label">Team *</label>
                    <select class="form-select" id="userTeam" required>
                        <option value="">Select a team...</option>
                        ${teams.map(team => `
                            <option value="${team.id}">${escapeHtml(team.name)}</option>
                        `).join('')}
                    </select>
                </div>
                <div class="mb-3">
                    <div class="form-check">
                        <input class="form-check-input" type="checkbox" id="userIsAdmin">
                        <label class="form-check-label" for="userIsAdmin">
                            Administrator privileges
                        </label>
                        <div class="form-text">Admins can manage teams, users, and system settings</div>
                    </div>
                </div>
            </form>
        `;

        const modalFooter = `
            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
            <button type="button" class="btn btn-primary" onclick="createUser()">
                <i class="fas fa-plus me-1"></i>Create User
            </button>
        `;

        const modal = createModal('createUserModal', 'Create New User', modalBody, modalFooter);
        
        // Handle form submission
        document.getElementById('createUserForm').addEventListener('submit', (e) => {
            e.preventDefault();
            createUser();
        });
        
        modal.show();
        
        // Focus on name field
        setTimeout(() => document.getElementById('userName').focus(), 100);
        
    } catch (error) {
        handleApiError(error, 'loading teams for user creation');
    }
}

// Create user
async function createUser() {
    const name = document.getElementById('userName').value.trim();
    const email = document.getElementById('userEmail').value.trim();
    const password = document.getElementById('userPassword').value;
    const teamId = document.getElementById('userTeam').value;
    const isAdmin = document.getElementById('userIsAdmin').checked;
    
    if (!name || !email || !password || !teamId) {
        showAlert('All fields are required', 'danger');
        return;
    }
    
    if (password.length < 8) {
        showAlert('Password must be at least 8 characters long', 'danger');
        return;
    }
    
    const createButton = document.querySelector('#createUserModal .btn-primary');
    setLoadingState(createButton);
    
    try {
        await apiClient.createUser({
            name,
            email,
            password,
            team_id: teamId,
            is_admin: isAdmin
        });
        
        showAlert('User created successfully!', 'success');
        
        // Close modal and refresh users
        bootstrap.Modal.getInstance(document.getElementById('createUserModal')).hide();
        removeModal('createUserModal');
        loadUsers();
        
    } catch (error) {
        handleApiError(error, 'creating user');
    } finally {
        setLoadingState(createButton, false);
    }
}

// View user details
async function viewUser(userId) {
    try {
        const users = await apiClient.getUsers();
        const user = users.find(u => u.id === userId);
        
        if (!user) {
            showAlert('User not found', 'danger');
            return;
        }
        
        const teams = await apiClient.getTeams();
        const userTeam = teams.find(t => t.id === user.team_id);
        
        const modalBody = `
            <div class="row">
                <div class="col-12">
                    <div class="text-center mb-4">
                        <div class="avatar-circle-large mx-auto mb-3">
                            ${user.name.charAt(0).toUpperCase()}
                        </div>
                        <h5>${escapeHtml(user.name)}</h5>
                        <p class="text-muted">${escapeHtml(user.email)}</p>
                        <span class="badge ${user.is_admin ? 'bg-danger' : 'bg-secondary'} fs-6">
                            ${user.is_admin ? 'Administrator' : 'User'}
                        </span>
                    </div>
                    <hr>
                    <div class="row">
                        <div class="col-md-6">
                            <h6>User Information</h6>
                            <p><strong>Team:</strong> ${userTeam ? escapeHtml(userTeam.name) : 'Unknown'}</p>
                            <p><strong>Created:</strong> ${formatDate(user.created_at)}</p>
                            <p><strong>ID:</strong> <code>${user.id}</code></p>
                        </div>
                        <div class="col-md-6">
                            <h6>Permissions</h6>
                            <p><strong>Admin Access:</strong> ${user.is_admin ? 'Yes' : 'No'}</p>
                            <p><strong>Status:</strong> <span class="badge bg-success">Active</span></p>
                        </div>
                    </div>
                </div>
            </div>
        `;
        
        const modalFooter = `
            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
            <button type="button" class="btn btn-primary" onclick="editUser('${userId}')">
                <i class="fas fa-edit me-1"></i>Edit User
            </button>
        `;
        
        const modal = createModal('viewUserModal', 'User Details', modalBody, modalFooter);
        modal.show();
        
    } catch (error) {
        handleApiError(error, 'loading user details');
    }
}

// Edit user
async function editUser(userId) {
    try {
        const users = await apiClient.getUsers();
        const user = users.find(u => u.id === userId);
        
        if (!user) {
            showAlert('User not found', 'danger');
            return;
        }
        
        const teams = await apiClient.getTeams();
        
        const modalBody = `
            <form id="editUserForm">
                <div class="mb-3">
                    <label for="editUserName" class="form-label">Full Name *</label>
                    <input type="text" class="form-control" id="editUserName" 
                           value="${escapeHtml(user.name)}" required>
                </div>
                <div class="mb-3">
                    <label for="editUserEmail" class="form-label">Email *</label>
                    <input type="email" class="form-control" id="editUserEmail" 
                           value="${escapeHtml(user.email)}" required>
                </div>
                <div class="mb-3">
                    <label for="editUserTeam" class="form-label">Team *</label>
                    <select class="form-select" id="editUserTeam" required>
                        ${teams.map(team => `
                            <option value="${team.id}" ${team.id === user.team_id ? 'selected' : ''}>
                                ${escapeHtml(team.name)}
                            </option>
                        `).join('')}
                    </select>
                </div>
                <div class="mb-3">
                    <div class="form-check">
                        <input class="form-check-input" type="checkbox" id="editUserIsAdmin" 
                               ${user.is_admin ? 'checked' : ''}>
                        <label class="form-check-label" for="editUserIsAdmin">
                            Administrator privileges
                        </label>
                    </div>
                </div>
                <div class="mb-3">
                    <label for="editUserPassword" class="form-label">New Password</label>
                    <input type="password" class="form-control" id="editUserPassword">
                    <div class="form-text">Leave blank to keep current password</div>
                </div>
            </form>
        `;
        
        const modalFooter = `
            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
            <button type="button" class="btn btn-primary" onclick="saveUserChanges('${userId}')">
                <i class="fas fa-save me-1"></i>Save Changes
            </button>
        `;
        
        const modal = createModal('editUserModal', 'Edit User', modalBody, modalFooter);
        
        // Handle form submission
        document.getElementById('editUserForm').addEventListener('submit', (e) => {
            e.preventDefault();
            saveUserChanges(userId);
        });
        
        modal.show();
        
    } catch (error) {
        handleApiError(error, 'loading user for editing');
    }
}

// Save user changes
async function saveUserChanges(userId) {
    const name = document.getElementById('editUserName').value.trim();
    const email = document.getElementById('editUserEmail').value.trim();
    const teamId = document.getElementById('editUserTeam').value;
    const isAdmin = document.getElementById('editUserIsAdmin').checked;
    const password = document.getElementById('editUserPassword').value;
    
    if (!name || !email || !teamId) {
        showAlert('Name, email, and team are required', 'danger');
        return;
    }
    
    const saveButton = document.querySelector('#editUserModal .btn-primary');
    setLoadingState(saveButton);
    
    try {
        const updateData = {
            name,
            email,
            team_id: teamId,
            is_admin: isAdmin
        };
        
        if (password) {
            if (password.length < 8) {
                showAlert('Password must be at least 8 characters long', 'danger');
                return;
            }
            updateData.password = password;
        }
        
        await apiClient.updateUser(userId, updateData);
        
        showAlert('User updated successfully!', 'success');
        
        // Close modal and refresh users
        bootstrap.Modal.getInstance(document.getElementById('editUserModal')).hide();
        removeModal('editUserModal');
        loadUsers();
        
        // Close view modal if open
        const viewModal = document.getElementById('viewUserModal');
        if (viewModal) {
            bootstrap.Modal.getInstance(viewModal)?.hide();
            removeModal('viewUserModal');
        }
        
    } catch (error) {
        handleApiError(error, 'updating user');
    } finally {
        setLoadingState(saveButton, false);
    }
}

// Delete user
function deleteUser(userId) {
    confirmAction('Are you sure you want to delete this user? This action cannot be undone.', async () => {
        try {
            await apiClient.deleteUser(userId);
            showAlert('User deleted successfully!', 'success');
            loadUsers();
            
            // Close any open modals
            const modals = ['viewUserModal', 'editUserModal'];
            modals.forEach(modalId => {
                const modalElement = document.getElementById(modalId);
                if (modalElement) {
                    bootstrap.Modal.getInstance(modalElement)?.hide();
                    removeModal(modalId);
                }
            });
            
        } catch (error) {
            handleApiError(error, 'deleting user');
        }
    });
}

// Add CSS for avatar circles
document.addEventListener('DOMContentLoaded', () => {
    const style = document.createElement('style');
    style.textContent = `
        .avatar-circle {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 14px;
        }
        
        .avatar-circle-large {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 32px;
        }
    `;
    document.head.appendChild(style);
});