<?php

declare(strict_types=1);

/**
 * HVAC Event Form Builder
 *
 * Extended form builder for native WordPress event management
 * Replaces TEC Community Events forms with comprehensive field control
 *
 * @package    HVAC_Community_Events
 * @subpackage Includes
 * @since      3.0.0
 */

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

/**
 * Class HVAC_Event_Form_Builder
 *
 * Extends HVAC_Form_Builder with event-specific field types and functionality
 */
class HVAC_Event_Form_Builder extends HVAC_Form_Builder {

    /**
     * Event-specific field defaults
     *
     * @var array
     */
    private array $event_field_defaults = [
        'datetime-local' => [
            'type' => 'datetime-local',
            'class' => 'hvac-datetime-field',
            'validate' => ['datetime'],
            'sanitize' => 'datetime',
        ],
        'venue-group' => [
            'type' => 'venue-group',
            'class' => 'hvac-venue-group',
            'wrapper_class' => 'form-group venue-group',
        ],
        'organizer-group' => [
            'type' => 'organizer-group',
            'class' => 'hvac-organizer-group',
            'wrapper_class' => 'form-group organizer-group',
        ],
    ];

    /**
     * WordPress timezone list for event timezone selection
     *
     * @var array|null
     */
    private ?array $timezone_list = null;

    /**
     * Constructor with promoted property.
     *
     * @param string $nonce_action Nonce action for the form
     */
    public function __construct(string $nonce_action = 'hvac_event_form') {
        parent::__construct($nonce_action);
        $this->init_event_specific_features();
    }

    /**
     * Initialize event-specific features
     */
    private function init_event_specific_features(): void {
        // Set form enctype for file uploads (featured images)
        $this->set_attributes(['enctype' => 'multipart/form-data']);

        // Load timezone list
        $this->timezone_list = $this->get_wordpress_timezones();
    }

    /**
     * Add event datetime field
     *
     * @param array $field_config Field configuration
     * @return self
     */
    public function add_datetime_field(array $field_config): self {
        $defaults = array_merge($this->event_field_defaults['datetime-local'], [
            'required' => true,
            'description' => 'Select date and time for the event',
        ]);

        $field = wp_parse_args($field_config, $defaults);

        // Ensure proper ID and name
        if (empty($field['id']) && !empty($field['name'])) {
            $field['id'] = sanitize_html_class($field['name']);
        }

        return $this->add_field($field);
    }

    /**
     * Add event timezone selection field
     *
     * @param array $field_config Field configuration
     * @return self
     */
    public function add_timezone_field(array $field_config = []): self {
        $defaults = [
            'type' => 'select',
            'name' => 'event_timezone',
            'label' => 'Event Timezone',
            'options' => $this->timezone_list ?? [],
            'value' => wp_timezone_string(),
            'required' => true,
            'class' => 'hvac-timezone-field',
            'description' => 'Select the timezone for this event',
        ];

        $field = wp_parse_args($field_config, $defaults);
        return $this->add_field($field);
    }

    /**
     * Add all-day event toggle
     *
     * @param array $field_config Field configuration
     * @return self
     */
    public function add_all_day_field(array $field_config = []): self {
        $defaults = [
            'type' => 'checkbox',
            'name' => 'event_all_day',
            'label' => 'All Day Event',
            'value' => '1',
            'class' => 'hvac-all-day-field',
            'description' => 'Check if this is an all-day event',
        ];

        $field = wp_parse_args($field_config, $defaults);
        return $this->add_field($field);
    }

    /**
     * Add venue field group
     *
     * @param array $field_config Field configuration
     * @return self
     */
    public function add_venue_group(array $field_config = []): self {
        $venue_fields = [
            [
                'type' => 'text',
                'name' => 'venue_name',
                'label' => 'Venue Name',
                'required' => true,
                'class' => 'hvac-venue-name',
                'placeholder' => 'Enter venue name',
            ],
            [
                'type' => 'textarea',
                'name' => 'venue_address',
                'label' => 'Address',
                'required' => false,
                'class' => 'hvac-venue-address',
                'placeholder' => 'Street address',
                'validate' => ['max_length' => 500],
            ],
            [
                'type' => 'text',
                'name' => 'venue_city',
                'label' => 'City',
                'required' => false,
                'class' => 'hvac-venue-city',
            ],
            [
                'type' => 'text',
                'name' => 'venue_state',
                'label' => 'State/Province',
                'required' => false,
                'class' => 'hvac-venue-state',
            ],
            [
                'type' => 'text',
                'name' => 'venue_zip',
                'label' => 'Postal Code',
                'required' => false,
                'class' => 'hvac-venue-zip',
                'validate' => ['pattern' => '/^[A-Za-z0-9\s\-]{3,10}$/'],
            ],
            [
                'type' => 'number',
                'name' => 'venue_capacity',
                'label' => 'Venue Capacity',
                'required' => false,
                'class' => 'hvac-venue-capacity',
                'validate' => ['min' => 1, 'max' => 10000],
                'description' => 'Maximum number of attendees (optional)',
            ],
            [
                'type' => 'hidden',
                'name' => 'venue_latitude',
                'class' => 'hvac-venue-lat',
            ],
            [
                'type' => 'hidden',
                'name' => 'venue_longitude',
                'class' => 'hvac-venue-lng',
            ],
        ];

        // Add all venue fields
        foreach ($venue_fields as $field) {
            $this->add_field($field);
        }

        return $this;
    }

    /**
     * Add organizer field group
     *
     * @param array $field_config Field configuration
     * @return self
     */
    public function add_organizer_group(array $field_config = []): self {
        $organizer_fields = [
            [
                'type' => 'text',
                'name' => 'organizer_name',
                'label' => 'Organizer Name',
                'required' => true,
                'class' => 'hvac-organizer-name',
                'placeholder' => 'Event organizer name',
            ],
            [
                'type' => 'email',
                'name' => 'organizer_email',
                'label' => 'Organizer Email',
                'required' => false,
                'class' => 'hvac-organizer-email',
                'validate' => ['email'],
                'sanitize' => 'email',
            ],
            [
                'type' => 'tel',
                'name' => 'organizer_phone',
                'label' => 'Organizer Phone',
                'required' => false,
                'class' => 'hvac-organizer-phone',
                'validate' => ['pattern' => '/^[\+]?[1-9][\d]{0,15}$/'],
            ],
            [
                'type' => 'url',
                'name' => 'organizer_website',
                'label' => 'Organizer Website',
                'required' => false,
                'class' => 'hvac-organizer-website',
                'validate' => ['url'],
                'sanitize' => 'url',
                'placeholder' => 'https://example.com',
            ],
        ];

        // Add all organizer fields
        foreach ($organizer_fields as $field) {
            $this->add_field($field);
        }

        return $this;
    }

    /**
     * Add HVAC-specific event fields
     *
     * @return self
     */
    public function add_hvac_fields(): self {
        $hvac_fields = [
            [
                'type' => 'select',
                'name' => 'trainer_requirements',
                'label' => 'Trainer Requirements',
                'options' => $this->get_trainer_requirement_options(),
                'required' => false,
                'class' => 'hvac-trainer-requirements',
                'description' => 'What type of trainer is required for this event?',
            ],
            [
                'type' => 'checkbox',
                'name' => 'certification_levels',
                'label' => 'Certification Levels',
                'options' => $this->get_certification_level_options(),
                'required' => false,
                'class' => 'hvac-certification-levels',
                'description' => 'Which certification levels does this event support?',
            ],
            [
                'type' => 'textarea',
                'name' => 'equipment_needed',
                'label' => 'Equipment Needed',
                'required' => false,
                'class' => 'hvac-equipment-needed',
                'placeholder' => 'List any specific equipment attendees should bring',
                'validate' => ['max_length' => 1000],
            ],
            [
                'type' => 'textarea',
                'name' => 'prerequisites',
                'label' => 'Prerequisites',
                'required' => false,
                'class' => 'hvac-prerequisites',
                'placeholder' => 'Any required knowledge or certifications for attendees',
                'validate' => ['max_length' => 1000],
            ],
        ];

        // Add all HVAC-specific fields
        foreach ($hvac_fields as $field) {
            $this->add_field($field);
        }

        return $this;
    }

    /**
     * Add featured image upload field
     *
     * @param array $field_config Field configuration
     * @return self
     */
    public function add_featured_image_field(array $field_config = []): self {
        $defaults = [
            'type' => 'file',
            'name' => 'event_featured_image',
            'label' => 'Featured Image',
            'required' => false,
            'class' => 'hvac-featured-image',
            'description' => 'Upload a featured image for this event (JPG, PNG, WebP)',
            'validate' => ['file_type' => ['jpg', 'jpeg', 'png', 'webp']],
        ];

        $field = wp_parse_args($field_config, $defaults);
        return $this->add_field($field);
    }

    /**
     * Enhanced validation for event-specific fields
     *
     * @param array $data Form data to validate
     * @return array Validation errors
     */
    public function validate(array $data): array {
        $errors = parent::validate($data);

        // Event datetime validation
        $errors = array_merge($errors, $this->validate_event_datetime($data));

        // Venue validation
        $errors = array_merge($errors, $this->validate_venue_data($data));

        // HVAC-specific validation
        $errors = array_merge($errors, $this->validate_hvac_fields($data));

        return $errors;
    }

    /**
     * Validate event datetime fields
     *
     * @param array $data Form data
     * @return array Validation errors
     */
    private function validate_event_datetime(array $data): array {
        $errors = [];

        if (isset($data['event_start_date']) && isset($data['event_end_date'])) {
            $start_time = strtotime($data['event_start_date']);
            $end_time = strtotime($data['event_end_date']);

            if ($start_time === false) {
                $errors['event_start_date'] = 'Invalid start date format.';
            } elseif ($start_time < time()) {
                $errors['event_start_date'] = 'Start date cannot be in the past.';
            }

            if ($end_time === false) {
                $errors['event_end_date'] = 'Invalid end date format.';
            } elseif ($start_time !== false && $end_time !== false && $end_time <= $start_time) {
                $errors['event_end_date'] = 'End date must be after start date.';
            }
        }

        return $errors;
    }

    /**
     * Validate venue data
     *
     * @param array $data Form data
     * @return array Validation errors
     */
    private function validate_venue_data(array $data): array {
        $errors = [];

        // Venue capacity validation
        if (!empty($data['venue_capacity'])) {
            $capacity = intval($data['venue_capacity']);
            if ($capacity < 1) {
                $errors['venue_capacity'] = 'Venue capacity must be at least 1.';
            } elseif ($capacity > 10000) {
                $errors['venue_capacity'] = 'Venue capacity cannot exceed 10,000.';
            }
        }

        return $errors;
    }

    /**
     * Validate HVAC-specific fields
     *
     * @param array $data Form data
     * @return array Validation errors
     */
    private function validate_hvac_fields(array $data): array {
        $errors = [];

        // Validate trainer requirements against available options
        if (!empty($data['trainer_requirements'])) {
            $valid_requirements = array_keys($this->get_trainer_requirement_options());
            if (!in_array($data['trainer_requirements'], $valid_requirements)) {
                $errors['trainer_requirements'] = 'Invalid trainer requirement selected.';
            }
        }

        return $errors;
    }

    /**
     * Enhanced sanitization for event fields
     *
     * @param array $data Raw form data
     * @return array Sanitized data
     */
    public function sanitize(array $data): array {
        $sanitized = parent::sanitize($data);

        // Event-specific sanitization
        $event_fields = [
            'event_start_date' => 'datetime',
            'event_end_date' => 'datetime',
            'event_timezone' => 'text',
            'venue_name' => 'text',
            'venue_address' => 'textarea',
            'venue_city' => 'text',
            'venue_state' => 'text',
            'venue_zip' => 'text',
            'venue_capacity' => 'int',
            'organizer_name' => 'text',
            'organizer_email' => 'email',
            'organizer_phone' => 'text',
            'organizer_website' => 'url',
            'trainer_requirements' => 'text',
            'equipment_needed' => 'textarea',
            'prerequisites' => 'textarea',
        ];

        foreach ($event_fields as $field => $sanitize_type) {
            if (isset($data[$field])) {
                switch ($sanitize_type) {
                    case 'datetime':
                        $sanitized[$field] = $this->sanitize_datetime($data[$field]);
                        break;
                    case 'int':
                        $sanitized[$field] = absint($data[$field]);
                        break;
                    case 'email':
                        $sanitized[$field] = sanitize_email($data[$field]);
                        break;
                    case 'url':
                        $sanitized[$field] = esc_url_raw($data[$field]);
                        break;
                    case 'textarea':
                        $sanitized[$field] = sanitize_textarea_field($data[$field]);
                        break;
                    default:
                        $sanitized[$field] = sanitize_text_field($data[$field]);
                }
            }
        }

        return $sanitized;
    }

    /**
     * Sanitize datetime input
     *
     * @param string $datetime Raw datetime input
     * @return string Sanitized datetime
     */
    private function sanitize_datetime(string $datetime): string {
        $timestamp = strtotime($datetime);
        return $timestamp !== false ? date('Y-m-d\TH:i', $timestamp) : '';
    }

    /**
     * Get WordPress timezone options
     *
     * @return array Timezone options
     */
    private function get_wordpress_timezones(): array {
        $zones = wp_timezone_choice('UTC');
        $timezone_options = [];

        // Parse the HTML select options into key-value pairs
        if (preg_match_all('/<option value="([^"]*)"[^>]*>([^<]*)<\/option>/', $zones, $matches)) {
            foreach ($matches[1] as $index => $value) {
                $timezone_options[$value] = $matches[2][$index];
            }
        }

        return $timezone_options;
    }

    /**
     * Get trainer requirement options
     *
     * @return array Trainer requirement options
     */
    private function get_trainer_requirement_options(): array {
        return [
            ''                    => 'No specific requirement',
            'certified_trainer'   => 'Certified HVAC Trainer',
            'master_trainer'      => 'Master Trainer',
            'industry_expert'     => 'Industry Expert',
            'manufacturer_rep'    => 'Manufacturer Representative',
        ];
    }

    /**
     * Get certification level options
     *
     * @return array Certification level options
     */
    private function get_certification_level_options(): array {
        return [
            'basic'        => 'Basic HVAC',
            'intermediate' => 'Intermediate HVAC',
            'advanced'     => 'Advanced HVAC',
            'commercial'   => 'Commercial Systems',
            'residential'  => 'Residential Systems',
            'refrigeration' => 'Refrigeration',
        ];
    }

    /**
     * Create complete event creation form
     *
     * @return self Configured form builder
     */
    public function create_event_form(): self {
        // Basic event information
        $this->add_field([
            'type' => 'text',
            'name' => 'event_title',
            'label' => 'Event Title',
            'required' => true,
            'class' => 'hvac-event-title',
            'placeholder' => 'Enter event title',
        ]);

        $this->add_field([
            'type' => 'textarea',
            'name' => 'event_description',
            'label' => 'Event Description',
            'required' => true,
            'class' => 'hvac-event-description',
            'placeholder' => 'Describe the event in detail',
            'validate' => ['min_length' => 50],
        ]);

        $this->add_field([
            'type' => 'textarea',
            'name' => 'event_excerpt',
            'label' => 'Event Summary',
            'required' => false,
            'class' => 'hvac-event-excerpt',
            'placeholder' => 'Brief summary for event listings',
            'validate' => ['max_length' => 300],
        ]);

        // DateTime fields
        $this->add_datetime_field([
            'name' => 'event_start_date',
            'label' => 'Start Date & Time',
            'required' => true,
        ]);

        $this->add_datetime_field([
            'name' => 'event_end_date',
            'label' => 'End Date & Time',
            'required' => true,
        ]);

        $this->add_all_day_field();
        $this->add_timezone_field();

        // Event URL
        $this->add_field([
            'type' => 'url',
            'name' => 'event_url',
            'label' => 'Event Website',
            'required' => false,
            'class' => 'hvac-event-url',
            'placeholder' => 'https://example.com/event-info',
            'validate' => ['url'],
        ]);

        // Venue and organizer information
        $this->add_venue_group();
        $this->add_organizer_group();

        // HVAC-specific fields
        $this->add_hvac_fields();

        // Featured image
        $this->add_featured_image_field();

        return $this;
    }

    /**
     * Create event editing form with pre-populated data
     *
     * @param int $event_id Event post ID
     * @return self Configured form builder
     */
    public function create_edit_form(int $event_id): self {
        // Create the form structure
        $this->create_event_form();

        // Pre-populate with event data
        $event_data = $this->get_event_data($event_id);
        if (!empty($event_data)) {
            $this->set_data($event_data);
        }

        // Add event ID as hidden field
        $this->add_field([
            'type' => 'hidden',
            'name' => 'event_id',
            'value' => (string)$event_id,
        ]);

        return $this;
    }

    /**
     * Get event data for form pre-population
     *
     * @param int $event_id Event post ID
     * @return array Event data
     */
    private function get_event_data(int $event_id): array {
        $post = get_post($event_id);
        if (!$post || $post->post_type !== 'tribe_events') {
            return [];
        }

        return [
            'event_title' => $post->post_title,
            'event_description' => $post->post_content,
            'event_excerpt' => $post->post_excerpt,
            'event_start_date' => get_post_meta($event_id, '_EventStartDate', true),
            'event_end_date' => get_post_meta($event_id, '_EventEndDate', true),
            'event_timezone' => get_post_meta($event_id, '_EventTimezone', true),
            'event_url' => get_post_meta($event_id, '_EventURL', true),
            // Add more meta field mappings as needed
        ];
    }
}