<?php
/**
 * HVAC Breadcrumbs System
 *
 * @package HVAC_Community_Events
 * @since 2.0.0
 */

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

/**
 * HVAC_Breadcrumbs class
 */
class HVAC_Breadcrumbs {
    
    /**
     * Constructor
     */
    public function __construct() {
        // Register shortcode
        add_shortcode('hvac_breadcrumbs', array($this, 'render_breadcrumbs'));
        
        // Auto-add breadcrumbs to trainer pages
        add_action('hvac_after_page_header', array($this, 'display_breadcrumbs'));
        
        // Enqueue styles
        add_action('wp_enqueue_scripts', array($this, 'enqueue_styles'));
    }
    
    /**
     * Enqueue breadcrumb styles
     */
    public function enqueue_styles() {
        if ($this->should_show_breadcrumbs()) {
            wp_enqueue_style(
                'hvac-breadcrumbs',
                HVAC_PLUGIN_URL . 'assets/css/hvac-breadcrumbs.css',
                array(),
                HVAC_PLUGIN_VERSION
            );
        }
    }
    
    /**
     * Get breadcrumb trail
     */
    private function get_breadcrumb_trail() {
        $trail = array();
        $current_url = home_url(add_query_arg(array(), $GLOBALS['wp']->request));
        
        // Always start with home
        $trail[] = array(
            'label' => 'Home',
            'url' => home_url('/')
        );
        
        // Check if we're on a trainer page
        if (strpos($current_url, '/trainer/') !== false) {
            $trail[] = array(
                'label' => 'Trainer',
                'url' => '/trainer/dashboard/'
            );
            
            // Parse the current path
            $path = parse_url($current_url, PHP_URL_PATH);
            $path = trim($path, '/');
            $segments = explode('/', $path);
            
            // Remove 'trainer' from segments as we've already added it
            array_shift($segments);
            
            // Build breadcrumb based on URL segments
            if (!empty($segments)) {
                $breadcrumb_map = $this->get_breadcrumb_map();
                $current_path = '/trainer';
                
                foreach ($segments as $index => $segment) {
                    $current_path .= '/' . $segment;
                    
                    // Check if we have a mapping for this path
                    if (isset($breadcrumb_map[$current_path])) {
                        $is_last = ($index === count($segments) - 1);
                        
                        $trail[] = array(
                            'label' => $breadcrumb_map[$current_path]['label'],
                            'url' => $is_last ? null : $current_path . '/',
                            'current' => $is_last
                        );
                    }
                }
            }
        } elseif (strpos($current_url, '/master-trainer/') !== false) {
            $trail[] = array(
                'label' => 'Master Trainer',
                'url' => '/master-trainer/master-dashboard/'
            );
            
            // Similar logic for master trainer pages
            $path = parse_url($current_url, PHP_URL_PATH);
            $path = trim($path, '/');
            $segments = explode('/', $path);
            array_shift($segments); // Remove 'master-trainer'
            
            if (!empty($segments)) {
                $breadcrumb_map = $this->get_breadcrumb_map();
                $current_path = '/master-trainer';
                
                foreach ($segments as $index => $segment) {
                    $current_path .= '/' . $segment;
                    
                    if (isset($breadcrumb_map[$current_path])) {
                        $is_last = ($index === count($segments) - 1);
                        
                        $trail[] = array(
                            'label' => $breadcrumb_map[$current_path]['label'],
                            'url' => $is_last ? null : $current_path . '/',
                            'current' => $is_last
                        );
                    }
                }
            }
        } elseif (strpos($current_url, '/trainer-registration/') !== false) {
            $trail[] = array(
                'label' => 'Registration',
                'url' => null,
                'current' => true
            );
        }
        
        // Allow filtering of breadcrumb trail
        return apply_filters('hvac_breadcrumb_trail', $trail, $current_url);
    }
    
    /**
     * Get breadcrumb mapping
     */
    private function get_breadcrumb_map() {
        return array(
            // Trainer pages
            '/trainer/dashboard' => array('label' => 'Dashboard'),
            '/trainer/event' => array('label' => 'Events'),
            '/trainer/event/manage' => array('label' => 'Manage Event'),
            '/trainer/event-summary' => array('label' => 'Event Summary'),
            '/trainer/generate-certificates' => array('label' => 'Generate Certificates'),
            '/trainer/certificate-reports' => array('label' => 'Certificate Reports'),
            '/trainer/venue' => array('label' => 'Venues'),
            '/trainer/venue/list' => array('label' => 'List'),
            '/trainer/venue/manage' => array('label' => 'Manage'),
            '/trainer/organizer' => array('label' => 'Organizers'),
            '/trainer/organizer/list' => array('label' => 'List'),
            '/trainer/organizer/manage' => array('label' => 'Manage'),
            '/trainer/profile' => array('label' => 'Profile'),
            '/trainer/profile/edit' => array('label' => 'Edit'),
            
            // Master trainer pages
            '/master-trainer/master-dashboard' => array('label' => 'Master Dashboard'),
            '/master-trainer/trainers' => array('label' => 'All Trainers'),
            '/master-trainer/reports' => array('label' => 'Global Reports')
        );
    }
    
    /**
     * Render breadcrumbs shortcode
     */
    public function render_breadcrumbs($atts = array()) {
        $atts = shortcode_atts(array(
            'separator' => '›',
            'show_home' => 'yes',
            'home_label' => 'Home',
            'class' => 'hvac-breadcrumb'
        ), $atts);
        
        $trail = $this->get_breadcrumb_trail();
        
        if (empty($trail)) {
            return '';
        }
        
        // Remove home if requested
        if ($atts['show_home'] === 'no' && !empty($trail)) {
            array_shift($trail);
        } else if (!empty($trail) && $atts['home_label'] !== 'Home') {
            $trail[0]['label'] = $atts['home_label'];
        }
        
        ob_start();
        ?>
        <nav class="<?php echo esc_attr($atts['class']); ?>" aria-label="Breadcrumb">
            <ol class="hvac-breadcrumb-list">
                <?php foreach ($trail as $index => $item): ?>
                    <li class="hvac-breadcrumb-item<?php echo isset($item['current']) && $item['current'] ? ' hvac-breadcrumb-current' : ''; ?>">
                        <?php if (!empty($item['url']) && (!isset($item['current']) || !$item['current'])): ?>
                            <a href="<?php echo esc_url($item['url']); ?>" class="hvac-breadcrumb-link">
                                <?php echo esc_html($item['label']); ?>
                            </a>
                        <?php else: ?>
                            <span class="hvac-breadcrumb-text" aria-current="page">
                                <?php echo esc_html($item['label']); ?>
                            </span>
                        <?php endif; ?>
                        
                        <?php if ($index < count($trail) - 1): ?>
                            <span class="hvac-breadcrumb-separator" aria-hidden="true">
                                <?php echo esc_html($atts['separator']); ?>
                            </span>
                        <?php endif; ?>
                    </li>
                <?php endforeach; ?>
            </ol>
        </nav>
        <?php
        return ob_get_clean();
    }
    
    /**
     * Display breadcrumbs automatically
     */
    public function display_breadcrumbs() {
        if ($this->should_show_breadcrumbs()) {
            echo do_shortcode('[hvac_breadcrumbs]');
        }
    }
    
    /**
     * Check if breadcrumbs should be shown
     */
    private function should_show_breadcrumbs() {
        // Show on all trainer and master trainer pages
        $current_url = home_url(add_query_arg(array(), $GLOBALS['wp']->request));
        
        return strpos($current_url, '/trainer/') !== false || 
               strpos($current_url, '/master-trainer/') !== false ||
               strpos($current_url, '/trainer-registration/') !== false;
    }
    
    /**
     * Get structured data for breadcrumbs (SEO)
     */
    public function get_structured_data() {
        $trail = $this->get_breadcrumb_trail();
        
        if (empty($trail)) {
            return '';
        }
        
        $items = array();
        
        foreach ($trail as $index => $item) {
            $items[] = array(
                '@type' => 'ListItem',
                'position' => $index + 1,
                'name' => $item['label'],
                'item' => !empty($item['url']) ? home_url($item['url']) : null
            );
        }
        
        $structured_data = array(
            '@context' => 'https://schema.org',
            '@type' => 'BreadcrumbList',
            'itemListElement' => $items
        );
        
        return '<script type="application/ld+json">' . json_encode($structured_data, JSON_UNESCAPED_SLASHES) . '</script>';
    }
}