<?php
/**
 * Simplified Generate Certificates Template
 *
 * @package HVAC_Community_Events
 * @subpackage Templates/Certificates
 */

// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

// Get current user ID
$current_user_id = get_current_user_id();

// Get event ID from URL
$event_id = isset($_GET['event_id']) ? absint($_GET['event_id']) : 0;

// Initialize variables
$events = array();
$attendees = array();
$selected_event_title = '';

try {
    // Get user's events directly from database
    global $wpdb;
    
    $events = $wpdb->get_results($wpdb->prepare(
        "SELECT ID, post_title, post_date 
         FROM {$wpdb->posts} 
         WHERE post_type = 'tribe_events' 
         AND post_author = %d 
         AND post_status = 'publish' 
         ORDER BY post_date DESC",
        $current_user_id
    ));

    // If event is selected, get attendees
    if ($event_id > 0) {
        // Verify the event belongs to the current user
        $event_found = false;
        foreach ($events as $event) {
            if ($event->ID == $event_id) {
                $event_found = true;
                $selected_event_title = $event->post_title;
                break;
            }
        }
        
        if ($event_found) {
            // Get attendees using the same query as the AJAX handler
            $attendees = $wpdb->get_results($wpdb->prepare(
                "SELECT 
                    p.ID as attendee_id,
                    p.post_parent as event_id,
                    COALESCE(tec_full_name.meta_value, tpp_full_name.meta_value, tickets_full_name.meta_value, 'Unknown Attendee') as holder_name,
                    COALESCE(tec_email.meta_value, tpp_email.meta_value, tickets_email.meta_value, tpp_attendee_email.meta_value, 'no-email@example.com') as holder_email,
                    COALESCE(checked_in.meta_value, '0') as check_in
                FROM {$wpdb->posts} p
                LEFT JOIN {$wpdb->postmeta} tec_full_name ON p.ID = tec_full_name.post_id AND tec_full_name.meta_key = '_tec_tickets_commerce_full_name'
                LEFT JOIN {$wpdb->postmeta} tpp_full_name ON p.ID = tpp_full_name.post_id AND tpp_full_name.meta_key = '_tribe_tpp_full_name'
                LEFT JOIN {$wpdb->postmeta} tickets_full_name ON p.ID = tickets_full_name.post_id AND tickets_full_name.meta_key = '_tribe_tickets_full_name'
                LEFT JOIN {$wpdb->postmeta} tec_email ON p.ID = tec_email.post_id AND tec_email.meta_key = '_tec_tickets_commerce_email'
                LEFT JOIN {$wpdb->postmeta} tpp_email ON p.ID = tpp_email.post_id AND tpp_email.meta_key = '_tribe_tpp_email'
                LEFT JOIN {$wpdb->postmeta} tickets_email ON p.ID = tickets_email.post_id AND tickets_email.meta_key = '_tribe_tickets_email'
                LEFT JOIN {$wpdb->postmeta} tpp_attendee_email ON p.ID = tpp_attendee_email.post_id AND tpp_attendee_email.meta_key = '_tribe_tpp_attendee_email'
                LEFT JOIN {$wpdb->postmeta} checked_in ON p.ID = checked_in.post_id AND checked_in.meta_key = '_tribe_tickets_attendee_checked_in'
                WHERE p.post_type IN ('tec_tc_attendee', 'tribe_tpp_attendees') 
                AND p.post_parent = %d
                ORDER BY p.ID ASC",
                $event_id
            ));
            
            // Check certificate status for each attendee
            if (!empty($attendees) && class_exists('HVAC_Certificate_Manager')) {
                $certificate_manager = HVAC_Certificate_Manager::instance();
                foreach ($attendees as $attendee) {
                    // Get the actual certificate data, not just boolean
                    $certificate = $certificate_manager->get_certificate_by_attendee($event_id, $attendee->attendee_id);
                    $attendee->has_certificate = !empty($certificate);
                    $attendee->certificate_data = $certificate;
                }
            }
            
            // Log for debugging if needed
            if (defined('WP_DEBUG') && WP_DEBUG) {
                error_log('Generate Certificates - Event ID: ' . $event_id . ', Attendees: ' . count($attendees));
            }
        }
    }
    
} catch (Exception $e) {
    error_log('Generate Certificates Error: ' . $e->getMessage());
}
?>

<div class="hvac-page-wrapper hvac-generate-certificates-page">
    <?php
    // Display trainer navigation menu
    if (class_exists('HVAC_Menu_System')) {
        HVAC_Menu_System::instance()->render_trainer_menu();
    }
    ?>
    
    <?php
    // Display breadcrumbs
    if (class_exists('HVAC_Breadcrumbs')) {
        echo HVAC_Breadcrumbs::instance()->render_breadcrumbs();
    }
    ?>
    
    <div class="hvac-container">
    <div class="hvac-content-wrapper">
        <!-- Page Header -->
        <div class="hvac-dashboard-header">
            <h1 class="entry-title">Generate Certificates</h1>
        </div>
        
        <div class="hvac-page-header">
            <p class="hvac-page-description">Generate certificates for attendees of your events.</p>
        </div>
        
        <!-- Step 1: Select Event -->
        <div class="hvac-section hvac-step-section">
            <h2>Step 1: Select Event</h2>
            
            <?php if (empty($events)) : ?>
                <div class="hvac-no-events">
                    <p>You don't have any events yet. Create your first event to start generating certificates.</p>
                    <p><a href="<?php echo esc_url(home_url('/manage-event/')); ?>" class="hvac-button hvac-primary">Create Event</a></p>
                </div>
            <?php else : ?>
                <div class="hvac-form-group">
                    <label for="event_id">Select an event to generate certificates for:</label>
                    <select name="event_id" id="event_id" class="hvac-select" required>
                        <option value="">Choose an event...</option>
                        <?php foreach ($events as $event) : ?>
                            <option value="<?php echo esc_attr($event->ID); ?>" <?php selected($event_id, $event->ID); ?>>
                                <?php echo esc_html($event->post_title) . ' (' . date('M j, Y', strtotime($event->post_date)) . ')'; ?>
                            </option>
                        <?php endforeach; ?>
                    </select>
                </div>
            <?php endif; ?>
        </div>

        <!-- Step 2: Select Attendees (shown when event is selected) -->
        <?php if ($event_id > 0) : ?>
            <div class="hvac-section hvac-step-section" id="step-select-attendees">
                <h2>Step 2: Select Attendees for "<?php echo esc_html($selected_event_title); ?>"</h2>
                
                <?php if (empty($attendees)) : ?>
                    <div class="hvac-no-attendees">
                        <p>This event has no attendees yet.</p>
                        <p>Attendees are created when people register for your event through the ticket system.</p>
                    </div>
                <?php else : ?>
                    <form id="generate-certificates-form" method="post" action="">
                        <?php wp_nonce_field('hvac_generate_certificates', 'hvac_certificate_nonce'); ?>
                        <input type="hidden" name="event_id" value="<?php echo esc_attr($event_id); ?>">
                        <input type="hidden" name="generate_certificates" value="1">
                        
                        <?php 
                        // Count attendees with certificates
                        $has_certificate_count = 0;
                        foreach ($attendees as $attendee) {
                            if (!empty($attendee->has_certificate)) {
                                $has_certificate_count++;
                            }
                        }
                        
                        if ($has_certificate_count > 0) : ?>
                            <div class="hvac-notice hvac-notice-info">
                                <p><strong>Note:</strong> <?php echo $has_certificate_count; ?> attendee(s) already have certificates. These will be skipped to prevent duplicates.</p>
                                <p>Attendees with existing certificates are marked with ✓ and cannot be selected.</p>
                            </div>
                        <?php endif; ?>
                        
                        <div class="hvac-form-group">
                            <div class="hvac-table-actions">
                                <button type="button" class="hvac-button hvac-secondary" id="select-all-attendees">Select All</button>
                                <button type="button" class="hvac-button hvac-secondary" id="select-checked-in">Select Checked-In Only</button>
                                <button type="button" class="hvac-button hvac-secondary" id="deselect-all-attendees">Deselect All</button>
                            </div>
                            
                            <div class="hvac-attendees-table-wrapper">
                                <table class="hvac-attendees-table">
                                    <thead>
                                        <tr>
                                            <th class="hvac-checkbox-column">
                                                <input type="checkbox" id="select-all-checkbox">
                                            </th>
                                            <th>Attendee Name</th>
                                            <th>Email</th>
                                            <th>Check-in Status</th>
                                            <th>Certificate Status</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        <?php foreach ($attendees as $attendee) : 
                                            $checked_in = !empty($attendee->check_in);
                                            $checked_in_class = $checked_in ? 'hvac-checked-in' : '';
                                            $status_class = $checked_in ? 'hvac-status-checked-in' : 'hvac-status-not-checked-in';
                                            $status_text = $checked_in ? 'Checked In' : 'Not Checked In';
                                            $attendee_name = $attendee->holder_name ?: 'Unknown';
                                            $attendee_email = $attendee->holder_email ?: 'No email';
                                            $has_certificate = !empty($attendee->has_certificate);
                                            $cert_status_class = $has_certificate ? 'hvac-has-certificate' : '';
                                        ?>
                                            <tr class="<?php echo esc_attr($checked_in_class . ' ' . $cert_status_class); ?>">
                                                <td>
                                                    <?php if (!$has_certificate) : ?>
                                                        <input type="checkbox" 
                                                               name="attendee_ids[]" 
                                                               value="<?php echo esc_attr($attendee->attendee_id); ?>" 
                                                               class="attendee-checkbox" 
                                                               <?php echo $checked_in ? 'checked' : ''; ?>>
                                                    <?php else : ?>
                                                        <span class="hvac-certificate-exists" title="Certificate already generated">✓</span>
                                                    <?php endif; ?>
                                                </td>
                                                <td class="hvac-attendee-name-cell">
                                                    <?php echo esc_html($attendee_name); ?>
                                                    <?php echo hvac_get_attendee_profile_icon($attendee); ?>
                                                </td>
                                                <td><?php echo esc_html($attendee_email); ?></td>
                                                <td>
                                                    <span class="<?php echo esc_attr($status_class); ?>">
                                                        <?php echo esc_html($status_text); ?>
                                                    </span>
                                                </td>
                                                <td>
                                                    <?php if ($has_certificate && !empty($attendee->certificate_data)) : ?>
                                                        <?php 
                                                        // Generate secure download URL for the certificate
                                                        $certificate_url = '';
                                                        if (class_exists('HVAC_Certificate_Security')) {
                                                            $security = HVAC_Certificate_Security::instance();
                                                            $cert_data = array(
                                                                'file_path' => $attendee->certificate_data->file_path,
                                                                'event_name' => $selected_event_title,
                                                                'attendee_name' => $attendee_name,
                                                                'certificate_id' => $attendee->certificate_data->certificate_id
                                                            );
                                                            $certificate_url = $security->generate_download_token(
                                                                $attendee->certificate_data->certificate_id,
                                                                $cert_data,
                                                                3600 // 1 hour validity
                                                            );
                                                        }
                                                        ?>
                                                        <?php if ($certificate_url) : ?>
                                                            <a href="<?php echo esc_url($certificate_url); ?>" 
                                                               target="_blank" 
                                                               class="hvac-certificate-link hvac-status-has-certificate"
                                                               title="View certificate">
                                                                Certificate Issued
                                                            </a>
                                                        <?php else : ?>
                                                            <span class="hvac-status-has-certificate">Certificate Issued</span>
                                                        <?php endif; ?>
                                                    <?php else : ?>
                                                        <span class="hvac-status-no-certificate">No Certificate</span>
                                                    <?php endif; ?>
                                                </td>
                                            </tr>
                                        <?php endforeach; ?>
                                    </tbody>
                                </table>
                            </div>
                        </div>
                        
                        <div class="hvac-form-group">
                            <button type="submit" class="hvac-button hvac-primary hvac-large hvac-touch-target" id="generate-certificates-btn">
                                Generate Certificates for Selected Attendees
                            </button>
                        </div>
                    </form>
                <?php endif; ?>
            </div>
        <?php endif; ?>
        
        <!-- Results Section -->
        <div id="generation-results" class="hvac-section" style="display: none;">
            <h2>Certificate Generation Results</h2>
            <div id="results-content"></div>
        </div>
    </div>
</div>

<style>
.hvac-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.hvac-dashboard-header {
    margin-bottom: 30px;
}

.hvac-section {
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.hvac-section h2 {
    margin: 0 0 20px 0;
    color: #007cba;
}

.hvac-form-group {
    margin-bottom: 20px;
}

.hvac-form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

.hvac-select {
    width: 100%;
    max-width: 500px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.hvac-button {
    padding: 10px 20px;
    background: #007cba;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    display: inline-block;
    font-size: 14px;
}

.hvac-button:hover {
    background: #005a87;
    color: white;
}

.hvac-button.hvac-secondary {
    background: #6c757d;
}

.hvac-button.hvac-secondary:hover {
    background: #5a6268;
}

.hvac-button.hvac-large {
    padding: 15px 30px;
    font-size: 16px;
    font-weight: bold;
}

.hvac-touch-target {
    min-height: 44px;
    min-width: 44px;
}

.hvac-table-actions {
    margin-bottom: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.hvac-attendees-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 4px;
    overflow: hidden;
}

.hvac-attendees-table th,
.hvac-attendees-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.hvac-attendees-table th {
    background: #007cba;
    color: white;
    font-weight: bold;
}

.hvac-checkbox-column {
    width: 50px;
    text-align: center;
}

.hvac-checkbox-column input {
    margin: 0;
}

.hvac-checked-in {
    background-color: #d4edda;
}

.hvac-status-checked-in {
    color: #155724;
    font-weight: bold;
}

.hvac-status-not-checked-in {
    color: #721c24;
}

.hvac-no-events,
.hvac-no-attendees {
    text-align: center;
    padding: 40px;
    background: white;
    border-radius: 8px;
    border: 2px dashed #ddd;
}

@media (max-width: 768px) {
    .hvac-attendees-table {
        font-size: 14px;
    }
    
    .hvac-attendees-table th,
    .hvac-attendees-table td {
        padding: 8px;
    }
    
    .hvac-table-actions {
        flex-direction: column;
    }
}
</style>

<script>
jQuery(document).ready(function($) {
    // Handle event selection change
    $('#event_id').on('change', function() {
        var eventId = $(this).val();
        if (eventId) {
            // Reload page with selected event
            window.location.href = window.location.pathname + '?event_id=' + eventId;
        }
    });
    
    // Select all checkbox functionality
    $('#select-all-checkbox').on('change', function() {
        $('.attendee-checkbox').prop('checked', this.checked);
    });
    
    // Individual checkbox change
    $('.attendee-checkbox').on('change', function() {
        var totalCheckboxes = $('.attendee-checkbox').length;
        var checkedCheckboxes = $('.attendee-checkbox:checked').length;
        $('#select-all-checkbox').prop('checked', totalCheckboxes === checkedCheckboxes);
    });
    
    // Select all button
    $('#select-all-attendees').on('click', function() {
        $('.attendee-checkbox').prop('checked', true);
        $('#select-all-checkbox').prop('checked', true);
    });
    
    // Select checked-in only button
    $('#select-checked-in').on('click', function() {
        $('.attendee-checkbox').prop('checked', false);
        $('.hvac-checked-in .attendee-checkbox').prop('checked', true);
        
        // Update select all checkbox
        var totalCheckboxes = $('.attendee-checkbox').length;
        var checkedCheckboxes = $('.attendee-checkbox:checked').length;
        $('#select-all-checkbox').prop('checked', totalCheckboxes === checkedCheckboxes);
    });
    
    // Deselect all button
    $('#deselect-all-attendees').on('click', function() {
        $('.attendee-checkbox').prop('checked', false);
        $('#select-all-checkbox').prop('checked', false);
    });
    
    // Form submission
    $('#generate-certificates-form').on('submit', function(e) {
        e.preventDefault();
        
        var checkedAttendees = $('.attendee-checkbox:checked').length;
        if (checkedAttendees === 0) {
            alert('Please select at least one attendee to generate certificates for.');
            return;
        }
        
        if (!confirm('Generate certificates for ' + checkedAttendees + ' selected attendees?')) {
            return;
        }
        
        var $button = $('#generate-certificates-btn');
        var originalText = $button.text();
        $button.text('Generating Certificates...').prop('disabled', true);
        
        // Submit form via AJAX (or fall back to regular submission)
        var formData = $(this).serialize();
        
        $.ajax({
            url: ajaxurl || window.location.href,
            type: 'POST',
            data: formData,
            success: function(response) {
                $('#generation-results').show();
                $('#results-content').html('<div class="hvac-success">Certificates generated successfully for ' + checkedAttendees + ' attendees!</div>');
                $button.text(originalText).prop('disabled', false);
            },
            error: function() {
                // Fall back to regular form submission
                document.getElementById('generate-certificates-form').submit();
            }
        });
    });
});
</script>

    </div> <!-- .hvac-content-wrapper -->
    </div> <!-- .hvac-container -->
</div> <!-- .hvac-page-wrapper -->