<?php

declare(strict_types=1);

/**
 * HVAC TEC Tickets Integration
 *
 * Handles integration between HVAC plugin and The Events Calendar ticketing system
 * Provides ticket creation, pricing, and attendee information collection
 *
 * @package    HVAC_Community_Events
 * @subpackage Includes
 * @since      3.2.0 (Phase 2B TEC Ticketing Integration)
 */

if (!defined('ABSPATH')) {
    exit;
}

/**
 * Class HVAC_TEC_Tickets
 *
 * TEC ticketing integration for HVAC events with mandatory attendee collection
 */
class HVAC_TEC_Tickets {

    /**
     * Singleton instance
     *
     * @var HVAC_TEC_Tickets|null
     */
    private static ?HVAC_TEC_Tickets $instance = null;

    /**
     * TEC ticket fieldset ID for mandatory fields
     *
     * @var int
     */
    private int $default_fieldset_id = 6235;

    /**
     * Mandatory attendee fields
     *
     * @var array
     */
    private array $mandatory_fields = [
        'first_name' => [
            'type' => 'text',
            'label' => 'First Name',
            'required' => true,
            'sanitize' => 'text'
        ],
        'last_name' => [
            'type' => 'text',
            'label' => 'Last Name',
            'required' => true,
            'sanitize' => 'text'
        ]
    ];

    /**
     * Get singleton instance
     *
     * @return HVAC_TEC_Tickets
     */
    public static function instance(): HVAC_TEC_Tickets {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * Constructor
     */
    private function __construct() {
        $this->init_hooks();
    }

    /**
     * Initialize hooks
     */
    private function init_hooks(): void {
        // Hook into TEC event creation
        add_action('tribe_events_event_save', [$this, 'handle_event_save'], 10, 2);

        // Add ticket management to HVAC forms
        add_action('hvac_event_form_after_basic_fields', [$this, 'add_ticket_fields']);

        // Handle ticket creation AJAX
        add_action('wp_ajax_hvac_create_event_tickets', [$this, 'ajax_create_event_tickets']);
        add_action('wp_ajax_hvac_update_event_tickets', [$this, 'ajax_update_event_tickets']);

        // Add mandatory attendee fields to ticket forms
        add_filter('tribe_tickets_attendee_registration_form_fields', [$this, 'add_mandatory_attendee_fields'], 10, 2);

        // Validate mandatory fields on ticket purchase
        add_action('tribe_tickets_before_save_attendee_data', [$this, 'validate_mandatory_attendee_data'], 10, 3);

        // Enqueue ticketing assets
        add_action('wp_enqueue_scripts', [$this, 'enqueue_ticketing_assets']);
    }

    /**
     * Handle event save and create associated tickets
     *
     * @param int $event_id Event ID
     * @param array $data Event data
     */
    public function handle_event_save(int $event_id, array $data): void {
        // Only process HVAC-created events
        if (!get_post_meta($event_id, '_hvac_event', true)) {
            return;
        }

        $ticket_data = get_post_meta($event_id, '_hvac_ticket_data', true);
        if (!empty($ticket_data)) {
            $this->create_tickets_for_event($event_id, $ticket_data);
        }
    }

    /**
     * Create tickets for an event
     *
     * @param int $event_id Event ID
     * @param array $tickets_data Tickets configuration
     * @return array Result with success status
     */
    public function create_tickets_for_event(int $event_id, array $tickets_data): array {
        $results = [];

        foreach ($tickets_data as $ticket_config) {
            $ticket_id = $this->create_tec_ticket($event_id, $ticket_config);

            if ($ticket_id) {
                // Add mandatory fieldset requirements
                $this->add_fieldset_requirements($ticket_id, $this->default_fieldset_id);
                $results[] = ['success' => true, 'ticket_id' => $ticket_id];
            } else {
                $results[] = ['success' => false, 'error' => 'Failed to create ticket'];
            }
        }

        return [
            'success' => count(array_filter($results, fn($r) => $r['success'])) > 0,
            'tickets' => $results
        ];
    }

    /**
     * Create a TEC ticket
     *
     * @param int $event_id Event ID
     * @param array $ticket_config Ticket configuration
     * @return int|false Ticket ID or false on failure
     */
    private function create_tec_ticket(int $event_id, array $ticket_config) {
        // Validate TEC is available
        if (!class_exists('Tribe__Tickets__Tickets')) {
            error_log('HVAC TEC Tickets: TEC Tickets plugin not available');
            return false;
        }

        $ticket_data = [
            'ticket_name' => sanitize_text_field($ticket_config['name'] ?? 'Event Ticket'),
            'ticket_description' => wp_kses_post($ticket_config['description'] ?? ''),
            'ticket_price' => floatval($ticket_config['price'] ?? 0),
            'ticket_start_date' => sanitize_text_field($ticket_config['start_date'] ?? ''),
            'ticket_end_date' => sanitize_text_field($ticket_config['end_date'] ?? ''),
            'ticket_stock' => intval($ticket_config['capacity'] ?? -1), // -1 = unlimited
            'ticket_sku' => '', // Trainers don't set SKUs per requirements
        ];

        // Create ticket using TEC API
        try {
            $ticket_handler = tribe('tickets.handler');
            $ticket_id = $ticket_handler->create_ticket($event_id, $ticket_data);

            if ($ticket_id) {
                // Add HVAC-specific metadata
                update_post_meta($ticket_id, '_hvac_ticket', true);
                update_post_meta($ticket_id, '_hvac_ticket_config', $ticket_config);

                return $ticket_id;
            }
        } catch (Exception $e) {
            error_log('HVAC TEC Tickets: Error creating ticket - ' . $e->getMessage());
        }

        return false;
    }

    /**
     * Add fieldset requirements to ticket
     *
     * @param int $ticket_id Ticket ID
     * @param int $fieldset_id Fieldset ID
     */
    private function add_fieldset_requirements(int $ticket_id, int $fieldset_id): void {
        $fieldset_fields = $this->get_tec_fieldset_fields($fieldset_id);

        if (!empty($fieldset_fields)) {
            update_post_meta($ticket_id, '_tribe_tickets_attendee_info_fieldset', $fieldset_id);

            // Ensure mandatory fields are included
            $all_fields = array_merge($this->mandatory_fields, $fieldset_fields);
            update_post_meta($ticket_id, '_hvac_ticket_mandatory_fields', $all_fields);
        }
    }

    /**
     * Get TEC fieldset fields
     *
     * @param int $fieldset_id Fieldset ID
     * @return array Fieldset fields
     */
    private function get_tec_fieldset_fields(int $fieldset_id): array {
        // Check if fieldset exists
        $fieldset_post = get_post($fieldset_id);
        if (!$fieldset_post || $fieldset_post->post_type !== 'tribe_rsvp_tickets_ticket_fieldset') {
            // Return basic fields if fieldset not found
            return [
                'email' => [
                    'type' => 'email',
                    'label' => 'Email Address',
                    'required' => true,
                    'sanitize' => 'email'
                ],
                'phone' => [
                    'type' => 'tel',
                    'label' => 'Phone Number',
                    'required' => false,
                    'sanitize' => 'text'
                ]
            ];
        }

        // Parse fieldset structure - this would need to be adapted based on TEC's actual fieldset format
        $fieldset_meta = get_post_meta($fieldset_id, '_tribe_tickets_fieldset_fields', true);

        if (is_array($fieldset_meta)) {
            return $this->parse_fieldset_structure($fieldset_meta);
        }

        return [];
    }

    /**
     * Parse fieldset structure into standardized format
     *
     * @param array $fieldset_data Raw fieldset data
     * @return array Parsed fields
     */
    private function parse_fieldset_structure(array $fieldset_data): array {
        $parsed_fields = [];

        foreach ($fieldset_data as $field) {
            if (!isset($field['slug']) || !isset($field['type'])) {
                continue;
            }

            $parsed_fields[$field['slug']] = [
                'type' => $this->normalize_field_type($field['type']),
                'label' => $field['label'] ?? ucfirst(str_replace('_', ' ', $field['slug'])),
                'required' => !empty($field['required']),
                'sanitize' => $this->get_sanitization_method($field['type']),
                'options' => $field['options'] ?? null
            ];
        }

        return $parsed_fields;
    }

    /**
     * Normalize field type for consistency
     *
     * @param string $field_type Original field type
     * @return string Normalized field type
     */
    private function normalize_field_type(string $field_type): string {
        $type_map = [
            'text' => 'text',
            'textarea' => 'textarea',
            'email' => 'email',
            'select' => 'select',
            'radio' => 'radio',
            'checkbox' => 'checkbox',
            'url' => 'url',
            'tel' => 'tel',
            'number' => 'number',
            'date' => 'date'
        ];

        return $type_map[$field_type] ?? 'text';
    }

    /**
     * Get sanitization method for field type
     *
     * @param string $field_type Field type
     * @return string Sanitization method
     */
    private function get_sanitization_method(string $field_type): string {
        $sanitization_map = [
            'text' => 'text',
            'textarea' => 'textarea',
            'email' => 'email',
            'url' => 'url',
            'tel' => 'text',
            'number' => 'int'
        ];

        return $sanitization_map[$field_type] ?? 'text';
    }

    /**
     * Add ticket fields to HVAC event forms
     *
     * @param object $form_builder Form builder instance
     */
    public function add_ticket_fields($form_builder): void {
        if (!method_exists($form_builder, 'add_field')) {
            return;
        }

        // Ticket section header
        $form_builder->add_field([
            'type' => 'custom',
            'name' => 'ticket_section_header',
            'custom_html' => '<h3 class="form-section-title">Event Ticketing</h3>',
            'wrapper_class' => 'form-section ticket-section'
        ]);

        // Enable ticketing checkbox
        $form_builder->add_field([
            'type' => 'checkbox',
            'name' => 'enable_ticketing',
            'label' => 'Enable Ticketing',
            'description' => 'Create tickets for this event with pricing and attendee collection',
            'value' => '1',
            'wrapper_class' => 'form-row enable-ticketing-row',
            'onchange' => 'hvacToggleTicketFields(this.checked)'
        ]);

        // Ticket configuration container (initially hidden)
        $form_builder->add_field([
            'type' => 'custom',
            'name' => 'ticket_config_start',
            'custom_html' => '<div id="ticket-config-section" class="ticket-config-section" style="display: none;">',
            'wrapper_class' => ''
        ]);

        // Ticket name
        $form_builder->add_field([
            'type' => 'text',
            'name' => 'ticket_name',
            'label' => 'Ticket Name',
            'placeholder' => 'e.g., "General Admission", "Early Bird"',
            'required' => false,
            'wrapper_class' => 'form-row ticket-config-field'
        ]);

        // Ticket price
        $form_builder->add_field([
            'type' => 'number',
            'name' => 'ticket_price',
            'label' => 'Ticket Price ($)',
            'placeholder' => '0.00',
            'step' => '0.01',
            'min' => '0',
            'required' => false,
            'wrapper_class' => 'form-row ticket-config-field'
        ]);

        // Ticket capacity
        $form_builder->add_field([
            'type' => 'number',
            'name' => 'ticket_capacity',
            'label' => 'Ticket Capacity',
            'placeholder' => 'Leave empty for unlimited',
            'min' => '1',
            'required' => false,
            'wrapper_class' => 'form-row ticket-config-field'
        ]);

        // Ticket sale start date
        $form_builder->add_field([
            'type' => 'datetime-local',
            'name' => 'ticket_start_sale',
            'label' => 'Ticket Sales Start',
            'description' => 'When ticket sales begin (optional)',
            'required' => false,
            'wrapper_class' => 'form-row ticket-config-field'
        ]);

        // Ticket sale end date
        $form_builder->add_field([
            'type' => 'datetime-local',
            'name' => 'ticket_end_sale',
            'label' => 'Ticket Sales End',
            'description' => 'When ticket sales end (optional)',
            'required' => false,
            'wrapper_class' => 'form-row ticket-config-field'
        ]);

        // RSVP option
        $form_builder->add_field([
            'type' => 'checkbox',
            'name' => 'enable_rsvp',
            'label' => 'Enable RSVP',
            'description' => 'Allow free RSVP alongside paid tickets',
            'value' => '1',
            'wrapper_class' => 'form-row ticket-config-field'
        ]);

        // Mandatory attendee info notice
        $form_builder->add_field([
            'type' => 'custom',
            'name' => 'attendee_info_notice',
            'custom_html' => '<div class="hvac-notice"><p><strong>Note:</strong> All tickets will automatically collect mandatory attendee information including first name, last name, and additional fields as configured.</p></div>',
            'wrapper_class' => 'form-row ticket-config-field'
        ]);

        // Close ticket configuration container
        $form_builder->add_field([
            'type' => 'custom',
            'name' => 'ticket_config_end',
            'custom_html' => '</div>',
            'wrapper_class' => ''
        ]);
    }

    /**
     * Add mandatory attendee fields to ticket forms
     *
     * @param array $fields Existing fields
     * @param int $ticket_id Ticket ID
     * @return array Modified fields
     */
    public function add_mandatory_attendee_fields(array $fields, int $ticket_id): array {
        // Only add to HVAC tickets
        if (!get_post_meta($ticket_id, '_hvac_ticket', true)) {
            return $fields;
        }

        // Get mandatory fields for this ticket
        $mandatory_fields = get_post_meta($ticket_id, '_hvac_ticket_mandatory_fields', true);
        if (empty($mandatory_fields)) {
            $mandatory_fields = $this->mandatory_fields;
        }

        // Merge mandatory fields with existing fields
        return array_merge($mandatory_fields, $fields);
    }

    /**
     * Validate mandatory attendee data
     *
     * @param int $attendee_id Attendee ID
     * @param array $attendee_data Attendee data
     * @param int $ticket_id Ticket ID
     */
    public function validate_mandatory_attendee_data(int $attendee_id, array $attendee_data, int $ticket_id): void {
        // Only validate HVAC tickets
        if (!get_post_meta($ticket_id, '_hvac_ticket', true)) {
            return;
        }

        $mandatory_fields = get_post_meta($ticket_id, '_hvac_ticket_mandatory_fields', true);
        if (empty($mandatory_fields)) {
            $mandatory_fields = $this->mandatory_fields;
        }

        $errors = [];

        foreach ($mandatory_fields as $field_name => $field_config) {
            if (!empty($field_config['required'])) {
                $value = $attendee_data[$field_name] ?? '';

                if (empty(trim($value))) {
                    $errors[] = sprintf('Field "%s" is required', $field_config['label']);
                }
            }
        }

        if (!empty($errors)) {
            wp_die(
                'Please complete all required fields: ' . implode(', ', $errors),
                'Required Fields Missing',
                ['response' => 400, 'back_link' => true]
            );
        }
    }

    /**
     * AJAX handler for creating event tickets
     */
    public function ajax_create_event_tickets(): void {
        // Security check
        if (!wp_verify_nonce($_POST['nonce'] ?? '', 'hvac_ticket_nonce')) {
            wp_send_json_error(['message' => __('Security check failed', 'hvac-community-events')]);
            return;
        }

        $event_id = intval($_POST['event_id'] ?? 0);
        $ticket_data = $_POST['ticket_data'] ?? [];

        if (!$event_id || empty($ticket_data)) {
            wp_send_json_error(['message' => __('Missing required data', 'hvac-community-events')]);
            return;
        }

        $result = $this->create_tickets_for_event($event_id, $ticket_data);

        if ($result['success']) {
            wp_send_json_success($result);
        } else {
            wp_send_json_error($result);
        }
    }

    /**
     * AJAX handler for updating event tickets
     */
    public function ajax_update_event_tickets(): void {
        // Security check
        if (!wp_verify_nonce($_POST['nonce'] ?? '', 'hvac_ticket_nonce')) {
            wp_send_json_error(['message' => __('Security check failed', 'hvac-community-events')]);
            return;
        }

        $ticket_id = intval($_POST['ticket_id'] ?? 0);
        $ticket_data = $_POST['ticket_data'] ?? [];

        if (!$ticket_id || empty($ticket_data)) {
            wp_send_json_error(['message' => __('Missing required data', 'hvac-community-events')]);
            return;
        }

        // Update ticket - implementation would depend on TEC's update API
        $success = $this->update_tec_ticket($ticket_id, $ticket_data);

        if ($success) {
            wp_send_json_success(['message' => __('Ticket updated successfully', 'hvac-community-events')]);
        } else {
            wp_send_json_error(['message' => __('Failed to update ticket', 'hvac-community-events')]);
        }
    }

    /**
     * Update a TEC ticket
     *
     * @param int $ticket_id Ticket ID
     * @param array $ticket_data Updated ticket data
     * @return bool Success status
     */
    private function update_tec_ticket(int $ticket_id, array $ticket_data): bool {
        // Implementation would depend on TEC's update API
        // For now, update basic post data

        $update_data = [
            'ID' => $ticket_id,
            'post_title' => sanitize_text_field($ticket_data['name'] ?? ''),
            'post_content' => wp_kses_post($ticket_data['description'] ?? '')
        ];

        $result = wp_update_post($update_data);

        if (!is_wp_error($result)) {
            // Update ticket meta
            if (isset($ticket_data['price'])) {
                update_post_meta($ticket_id, '_price', floatval($ticket_data['price']));
            }
            if (isset($ticket_data['capacity'])) {
                update_post_meta($ticket_id, '_stock', intval($ticket_data['capacity']));
            }

            return true;
        }

        return false;
    }

    /**
     * Enqueue ticketing assets
     */
    public function enqueue_ticketing_assets(): void {
        // Only enqueue on event creation/edit pages
        if (!$this->is_hvac_event_page()) {
            return;
        }

        wp_enqueue_script(
            'hvac-tec-tickets',
            HVAC_PLUGIN_URL . 'assets/js/hvac-tec-tickets.js',
            ['jquery'],
            HVAC_VERSION,
            true
        );

        wp_localize_script('hvac-tec-tickets', 'hvacTecTickets', [
            'ajaxurl' => admin_url('admin-ajax.php'),
            'nonce' => wp_create_nonce('hvac_ticket_nonce'),
            'strings' => [
                'ticketCreated' => __('Ticket created successfully', 'hvac-community-events'),
                'ticketUpdated' => __('Ticket updated successfully', 'hvac-community-events'),
                'error' => __('An error occurred. Please try again.', 'hvac-community-events'),
                'confirmRemove' => __('Are you sure you want to remove this ticket?', 'hvac-community-events')
            ]
        ]);

        wp_enqueue_style(
            'hvac-tec-tickets',
            HVAC_PLUGIN_URL . 'assets/css/hvac-tec-tickets.css',
            [],
            HVAC_VERSION
        );
    }

    /**
     * Check if current page is an HVAC event page
     *
     * @return bool
     */
    private function is_hvac_event_page(): bool {
        global $wp;

        if (!is_page()) {
            return false;
        }

        $current_url = home_url(add_query_arg([], $wp->request));
        $event_patterns = [
            '/trainer/events/create',
            '/trainer/events/edit',
            '/trainer/events/manage'
        ];

        foreach ($event_patterns as $pattern) {
            if (strpos($current_url, $pattern) !== false) {
                return true;
            }
        }

        return false;
    }
}

// Initialize the TEC Tickets integration
HVAC_TEC_Tickets::instance();