// Admin JavaScript for Ryans Recruit Firm

// Check authentication on all admin pages except login
if (!window.location.pathname.includes('login.html')) {
    checkAuth();
}

async function checkAuth() {
    try {
        const response = await fetch('/api/admin/check');
        const data = await response.json();

        if (!data.loggedIn) {
            window.location.href = '/admin/login.html';
            return;
        }

        // Update admin name in header if exists
        const adminNameEl = document.getElementById('admin-name');
        if (adminNameEl && data.admin) {
            adminNameEl.textContent = data.admin.fullName;
        }
    } catch (err) {
        console.error('Auth check failed:', err);
        window.location.href = '/admin/login.html';
    }
}

// Login page handlers
if (window.location.pathname.includes('login.html')) {
    checkFirstAdmin();
    document.getElementById('login-form')?.addEventListener('submit', handleLogin);
}

async function checkFirstAdmin() {
    try {
        const response = await fetch('/api/admin/check-first');
        const data = await response.json();

        if (data.isFirstAdmin) {
            document.getElementById('first-admin-notice').style.display = 'block';
            document.getElementById('full-name-group').style.display = 'block';
            document.querySelector('button[type="submit"]').textContent = 'Create Admin Account';
        }
    } catch (err) {
        console.error('Error checking first admin:', err);
    }
}

async function handleLogin(e) {
    e.preventDefault();

    const form = e.target;
    const submitBtn = form.querySelector('button[type="submit"]');
    const originalText = submitBtn.textContent;

    submitBtn.disabled = true;
    submitBtn.innerHTML = '<span class="loading"></span> Processing...';

    const formData = new FormData(form);
    const data = Object.fromEntries(formData);

    try {
        const response = await fetch('/api/admin/login', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });

        const result = await response.json();

        if (response.ok) {
            showAlert('Login successful!', 'success');
            setTimeout(() => window.location.href = '/admin/dashboard.html', 500);
        } else {
            showAlert(result.error || 'Login failed', 'error');
        }
    } catch (err) {
        console.error('Login error:', err);
        showAlert('Login failed. Please try again.', 'error');
    } finally {
        submitBtn.disabled = false;
        submitBtn.textContent = originalText;
    }
}

// Dashboard page
if (window.location.pathname.includes('dashboard.html')) {
    loadDashboardStats();
}

async function loadDashboardStats() {
    try {
        const response = await fetch('/api/admin/stats');
        const stats = await response.json();

        document.getElementById('stat-new-applications').textContent = stats.new_applications || 0;
        document.getElementById('stat-total-applications').textContent = stats.total_applications || 0;
        document.getElementById('stat-total-applicants').textContent = stats.total_applicants || 0;
        document.getElementById('stat-active-jobs').textContent = stats.active_jobs || 0;

        if (stats.unread_messages > 0) {
            document.getElementById('stat-unread-messages').textContent = stats.unread_messages;
            document.getElementById('stat-unread-messages').parentElement.style.display = 'block';
        }
    } catch (err) {
        console.error('Error loading stats:', err);
    }
}

// Applications page
if (window.location.pathname.includes('applicants.html')) {
    loadApplications();
}

async function loadApplications(filters = {}) {
    const container = document.getElementById('applications-container');
    const loading = document.getElementById('loading');

    try {
        const params = new URLSearchParams(filters);
        const response = await fetch(`/api/admin/applications?${params}`);
        const applications = await response.json();

        if (loading) loading.style.display = 'none';

        if (applications.length === 0) {
            container.innerHTML = '<div class="text-center"><p>No applications found.</p></div>';
            return;
        }

        container.innerHTML = `
            <table>
                <thead>
                    <tr>
                        <th>Applicant</th>
                        <th>Job</th>
                        <th>Experience</th>
                        <th>Applied</th>
                        <th>Status</th>
                        <th>Actions</th>
                    </tr>
                </thead>
                <tbody>
                    ${applications.map(app => `
                        <tr>
                            <td>
                                <strong>${escapeHtml(app.full_name)}</strong><br>
                                <small>${escapeHtml(app.email)}</small>
                            </td>
                            <td>${escapeHtml(app.job_title || 'General Application')}</td>
                            <td>${app.years_of_experience || 'N/A'} years</td>
                            <td>${new Date(app.applied_at).toLocaleDateString()}</td>
                            <td><span class="tag tag-${getStatusColor(app.status)}">${escapeHtml(app.status)}</span></td>
                            <td>
                                <a href="/admin/applicants.html?id=${app.id}" class="btn btn-sm btn-primary">View</a>
                                <a href="/api/admin/applications/${app.id}/cv" class="btn btn-sm btn-secondary" target="_blank">CV</a>
                            </td>
                        </tr>
                    `).join('')}
                </tbody>
            </table>
        `;
    } catch (err) {
        console.error('Error loading applications:', err);
        if (loading) loading.style.display = 'none';
        container.innerHTML = '<div class="alert alert-error">Failed to load applications</div>';
    }
}

// Jobs management page
if (window.location.pathname.includes('jobs.html') && window.location.pathname.includes('admin')) {
    loadAdminJobs();
}

async function loadAdminJobs() {
    const container = document.getElementById('jobs-container');
    const loading = document.getElementById('loading');

    try {
        const response = await fetch('/api/admin/jobs');
        const jobs = await response.json();

        if (loading) loading.style.display = 'none';

        container.innerHTML = `
            <div style="margin-bottom: 2rem;">
                <button onclick="showJobForm()" class="btn btn-success">+ Create New Job</button>
            </div>
            <table>
                <thead>
                    <tr>
                        <th>Title</th>
                        <th>Department</th>
                        <th>Location</th>
                        <th>Status</th>
                        <th>Created</th>
                        <th>Actions</th>
                    </tr>
                </thead>
                <tbody>
                    ${jobs.map(job => `
                        <tr>
                            <td><strong>${escapeHtml(job.title)}</strong></td>
                            <td>${escapeHtml(job.department || 'N/A')}</td>
                            <td>${escapeHtml(job.location || 'N/A')}</td>
                            <td><span class="tag ${job.is_active ? 'tag-success' : 'tag-error'}">${job.is_active ? 'Active' : 'Inactive'}</span></td>
                            <td>${new Date(job.created_at).toLocaleDateString()}</td>
                            <td>
                                <button onclick="editJob(${job.id})" class="btn btn-sm btn-primary">Edit</button>
                                <button onclick="toggleJobStatus(${job.id}, ${!job.is_active})" class="btn btn-sm btn-secondary">${job.is_active ? 'Deactivate' : 'Activate'}</button>
                            </td>
                        </tr>
                    `).join('')}
                </tbody>
            </table>
        `;
    } catch (err) {
        console.error('Error loading jobs:', err);
        if (loading) loading.style.display = 'none';
        container.innerHTML = '<div class="alert alert-error">Failed to load jobs</div>';
    }
}

async function toggleJobStatus(jobId, isActive) {
    try {
        const response = await fetch(`/api/admin/jobs/${jobId}`, {
            method: 'PATCH',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ isActive })
        });

        if (response.ok) {
            showAlert(`Job ${isActive ? 'activated' : 'deactivated'} successfully`, 'success');
            loadAdminJobs();
        } else {
            showAlert('Failed to update job status', 'error');
        }
    } catch (err) {
        console.error('Error updating job:', err);
        showAlert('Failed to update job status', 'error');
    }
}

// Logout
async function logout() {
    try {
        await fetch('/api/admin/logout', { method: 'POST' });
        window.location.href = '/admin/login.html';
    } catch (err) {
        console.error('Logout error:', err);
        window.location.href = '/admin/login.html';
    }
}

// Utility functions
function escapeHtml(text) {
    if (!text) return '';
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}

function getStatusColor(status) {
    const colors = {
        'new': 'primary',
        'reviewing': 'warning',
        'interview': 'info',
        'hired': 'success',
        'rejected': 'error'
    };
    return colors[status] || 'primary';
}

function showAlert(message, type = 'info') {
    const alertDiv = document.createElement('div');
    alertDiv.className = `alert alert-${type}`;
    alertDiv.textContent = message;
    alertDiv.style.position = 'fixed';
    alertDiv.style.top = '20px';
    alertDiv.style.right = '20px';
    alertDiv.style.zIndex = '10000';
    alertDiv.style.minWidth = '300px';

    document.body.appendChild(alertDiv);

    setTimeout(() => {
        alertDiv.remove();
    }, 5000);
}