<?php
/**
 * Cookie Consent Whisker for TigerStyle Whiskers
 * 
 * Smart consent banners with feline finesse - precise, elegant, and respectful
 * Like a cat asking permission before entering a room!
 */

// Prevent direct access
if (!defined('ABSPATH')) {
    exit;
}

class TigerStyleWhiskers_CookieConsent {
    
    /**
     * Single instance
     */
    private static $instance = null;
    
    /**
     * Consent status cache
     */
    private $consent_status = array();
    
    /**
     * Cookie categories
     */
    private $cookie_categories = array(
        'necessary' => array(
            'name' => 'Necessary',
            'description' => 'Essential for website functionality',
            'required' => true,
            'color' => '#2c3e50'
        ),
        'analytics' => array(
            'name' => 'Analytics',
            'description' => 'Help us understand how visitors use our site',
            'required' => false,
            'color' => '#ff6b35'
        ),
        'marketing' => array(
            'name' => 'Marketing',
            'description' => 'Used to track visitors and display relevant ads',
            'required' => false,
            'color' => '#f7931e'
        ),
        'preferences' => array(
            'name' => 'Preferences',
            'description' => 'Remember your settings and preferences',
            'required' => false,
            'color' => '#3498db'
        )
    );
    
    /**
     * Get instance
     */
    public static function instance() {
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    /**
     * Constructor
     */
    private function __construct() {
        $this->init_consent_whisker();
    }
    
    /**
     * Initialize cookie consent whisker
     */
    private function init_consent_whisker() {
        // Frontend hooks
        add_action('wp_footer', array($this, 'render_consent_banner'), 999);
        add_action('wp_enqueue_scripts', array($this, 'enqueue_consent_assets'));
        
        // AJAX handlers
        add_action('wp_ajax_tigerstyle_whiskers_update_consent', array($this, 'handle_consent_update'));
        add_action('wp_ajax_nopriv_tigerstyle_whiskers_update_consent', array($this, 'handle_consent_update'));
        
        // Admin hooks
        if (is_admin()) {
            add_action('admin_post_update_cookie_consent_settings', array($this, 'handle_settings_update'));
        }
        
        // Check consent status on init
        add_action('init', array($this, 'check_consent_status'));
        
        // Integrate with TigerStyle Heat Analytics
        add_action('init', array($this, 'integrate_with_analytics'));
        
        if (defined('WP_DEBUG') && WP_DEBUG) {
            error_log('TigerStyle Whiskers: Cookie consent whisker is alert and ready!');
        }
    }
    
    /**
     * Check current consent status
     */
    public function check_consent_status() {
        $this->consent_status = $this->get_visitor_consent();
        
        // If no consent recorded and GDPR applies, show banner
        if (TigerStyleWhiskers_BoundaryDetector::is_gdpr_territory() && !$this->has_consent_choice()) {
            $this->consent_status['show_banner'] = true;
        }
    }
    
    /**
     * Get visitor consent from cookies
     */
    private function get_visitor_consent() {
        $default_consent = array(
            'necessary' => true,  // Always true
            'analytics' => false,
            'marketing' => false,
            'preferences' => false,
            'timestamp' => null,
            'version' => null,
            'show_banner' => false
        );
        
        // Check for consent cookie
        $consent_cookie = isset($_COOKIE['tigerstyle_whiskers_consent']) ? 
                         json_decode(stripslashes($_COOKIE['tigerstyle_whiskers_consent']), true) : 
                         array();
        
        return array_merge($default_consent, $consent_cookie ?: array());
    }
    
    /**
     * Check if visitor has made a consent choice
     */
    private function has_consent_choice() {
        return !empty($this->consent_status['timestamp']);
    }
    
    /**
     * Enqueue consent assets
     */
    public function enqueue_consent_assets() {
        // Only enqueue if we need to show consent UI
        if (!$this->should_show_consent_ui()) {
            return;
        }
        
        wp_enqueue_style(
            'tigerstyle-whiskers-consent',
            TIGERSTYLE_WHISKERS_PLUGIN_URL . 'assets/css/consent.css',
            array(),
            TIGERSTYLE_WHISKERS_VERSION
        );
        
        wp_enqueue_script(
            'tigerstyle-whiskers-consent',
            TIGERSTYLE_WHISKERS_PLUGIN_URL . 'assets/js/consent.js',
            array('jquery'),
            TIGERSTYLE_WHISKERS_VERSION,
            true
        );
        
        // Localize script
        wp_localize_script('tigerstyle-whiskers-consent', 'tigerstyleWhiskersConsent', array(
            'ajaxurl' => admin_url('admin-ajax.php'),
            'nonce' => wp_create_nonce('tigerstyle_whiskers_consent'),
            'categories' => $this->cookie_categories,
            'current_consent' => $this->consent_status,
            'strings' => array(
                'accept_all' => __('Accept All Cookies', 'tigerstyle-whiskers'),
                'accept_necessary' => __('Accept Necessary Only', 'tigerstyle-whiskers'),
                'customize' => __('Customize Settings', 'tigerstyle-whiskers'),
                'save_preferences' => __('Save My Preferences', 'tigerstyle-whiskers'),
                'privacy_policy' => __('Privacy Policy', 'tigerstyle-whiskers'),
                'learn_more' => __('Learn More', 'tigerstyle-whiskers'),
            )
        ));
    }
    
    /**
     * Should we show consent UI?
     */
    private function should_show_consent_ui() {
        // Show if GDPR applies and no consent recorded
        return TigerStyleWhiskers_BoundaryDetector::is_gdpr_territory() && !$this->has_consent_choice();
    }
    
    /**
     * Render consent banner
     */
    public function render_consent_banner() {
        if (!$this->should_show_consent_ui()) {
            return;
        }
        
        $settings = $this->get_consent_settings();
        ?>
        <!-- TigerStyle Whiskers: Cookie Consent Banner -->
        <div id="tigerstyle-whiskers-consent-overlay" class="tw-consent-overlay" style="display: none;">
            <div class="tw-consent-banner">
                <div class="tw-consent-header">
                    <div class="tw-consent-icon">
                        <?php echo $this->get_whiskers_icon(); ?>
                    </div>
                    <h3 class="tw-consent-title">
                        <?php echo esc_html($settings['banner_title'] ?: __('We Respect Your Privacy', 'tigerstyle-whiskers')); ?>
                    </h3>
                </div>
                
                <div class="tw-consent-content">
                    <p class="tw-consent-message">
                        <?php echo wp_kses_post($settings['banner_message'] ?: $this->get_default_banner_message()); ?>
                    </p>
                    
                    <div class="tw-consent-categories" id="tw-consent-categories" style="display: none;">
                        <?php foreach ($this->cookie_categories as $key => $category): ?>
                        <div class="tw-consent-category">
                            <div class="tw-consent-category-header">
                                <label class="tw-consent-switch">
                                    <input 
                                        type="checkbox" 
                                        name="consent_<?php echo esc_attr($key); ?>"
                                        id="consent_<?php echo esc_attr($key); ?>"
                                        <?php checked($category['required'] || $this->consent_status[$key]); ?>
                                        <?php disabled($category['required']); ?>
                                    >
                                    <span class="tw-consent-slider" style="background-color: <?php echo esc_attr($category['color']); ?>"></span>
                                </label>
                                <div class="tw-consent-category-info">
                                    <h4><?php echo esc_html($category['name']); ?></h4>
                                    <p><?php echo esc_html($category['description']); ?></p>
                                    <?php if ($category['required']): ?>
                                        <small class="tw-required"><?php _e('Required', 'tigerstyle-whiskers'); ?></small>
                                    <?php endif; ?>
                                </div>
                            </div>
                        </div>
                        <?php endforeach; ?>
                    </div>
                </div>
                
                <div class="tw-consent-actions">
                    <button type="button" class="tw-btn tw-btn-customize" onclick="tigerstyleWhiskersConsent.showCategories()">
                        <?php _e('Customize Settings', 'tigerstyle-whiskers'); ?>
                    </button>
                    <button type="button" class="tw-btn tw-btn-necessary" onclick="tigerstyleWhiskersConsent.acceptNecessary()">
                        <?php _e('Necessary Only', 'tigerstyle-whiskers'); ?>
                    </button>
                    <button type="button" class="tw-btn tw-btn-accept" onclick="tigerstyleWhiskersConsent.acceptAll()">
                        <?php _e('Accept All', 'tigerstyle-whiskers'); ?>
                    </button>
                </div>
                
                <div class="tw-consent-footer">
                    <a href="<?php echo esc_url($settings['privacy_policy_url'] ?: get_privacy_policy_url()); ?>" target="_blank">
                        <?php _e('Privacy Policy', 'tigerstyle-whiskers'); ?>
                    </a>
                    <?php if (!empty($settings['cookie_policy_url'])): ?>
                    • <a href="<?php echo esc_url($settings['cookie_policy_url']); ?>" target="_blank">
                        <?php _e('Cookie Policy', 'tigerstyle-whiskers'); ?>
                    </a>
                    <?php endif; ?>
                </div>
            </div>
        </div>
        
        <!-- Consent Management Button (for users to change preferences) -->
        <?php if ($this->has_consent_choice()): ?>
        <div id="tigerstyle-whiskers-consent-manager" class="tw-consent-manager">
            <button type="button" class="tw-consent-manage-btn" onclick="tigerstyleWhiskersConsent.showBanner()">
                <?php echo $this->get_whiskers_icon(); ?>
                <span><?php _e('Cookie Settings', 'tigerstyle-whiskers'); ?></span>
            </button>
        </div>
        <?php endif; ?>
        
        <script type="text/javascript">
        // Show consent banner if needed
        document.addEventListener('DOMContentLoaded', function() {
            <?php if ($this->should_show_consent_ui()): ?>
            tigerstyleWhiskersConsent.showBanner();
            <?php endif; ?>
        });
        </script>
        <?php
    }
    
    /**
     * Get whiskers icon SVG
     */
    private function get_whiskers_icon() {
        return '<svg width="24" height="24" viewBox="0 0 24 24" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
            <!-- Cat face with whiskers -->
            <ellipse cx="12" cy="14" rx="8" ry="7" fill="currentColor" opacity="0.9"/>
            <!-- Cat ears -->
            <ellipse cx="8" cy="8" rx="2.5" ry="3" fill="currentColor"/>
            <ellipse cx="16" cy="8" rx="2.5" ry="3" fill="currentColor"/>
            <!-- Cat eyes -->
            <ellipse cx="9.5" cy="12" rx="1.2" ry="1.5" fill="white"/>
            <ellipse cx="14.5" cy="12" rx="1.2" ry="1.5" fill="white"/>
            <!-- Cat nose -->
            <ellipse cx="12" cy="14.5" rx="0.8" ry="0.6" fill="currentColor"/>
            <!-- Whiskers (the most important part!) -->
            <path d="M4 11 L7 12 M17 12 L20 11 M4 13 L7 14 M17 14 L20 13 M4 15 L7 16 M17 16 L20 15" 
                  stroke="currentColor" stroke-width="1.5" fill="none" opacity="0.8"/>
        </svg>';
    }
    
    /**
     * Get default banner message
     */
    private function get_default_banner_message() {
        return sprintf(
            __('We use cookies to enhance your browsing experience and analyze our traffic. Some cookies are essential for our website to function properly. %s', 'tigerstyle-whiskers'),
            '<strong>' . __('Your choice matters to us - just like a cat choosing where to sit!', 'tigerstyle-whiskers') . '</strong>'
        );
    }
    
    /**
     * Handle consent update via AJAX
     */
    public function handle_consent_update() {
        // Verify nonce
        if (!wp_verify_nonce($_POST['nonce'], 'tigerstyle_whiskers_consent')) {
            wp_die(__('Security check failed', 'tigerstyle-whiskers'));
        }
        
        $consent_data = array(
            'necessary' => true, // Always true
            'analytics' => isset($_POST['analytics']) && $_POST['analytics'] === 'true',
            'marketing' => isset($_POST['marketing']) && $_POST['marketing'] === 'true',
            'preferences' => isset($_POST['preferences']) && $_POST['preferences'] === 'true',
            'timestamp' => current_time('timestamp'),
            'version' => TIGERSTYLE_WHISKERS_VERSION,
            'ip_hash' => hash('sha256', TigerStyleWhiskers_BoundaryDetector::instance()->get_visitor_ip()),
            'user_agent_hash' => hash('sha256', $_SERVER['HTTP_USER_AGENT'] ?? ''),
        );
        
        // Set consent cookie (365 days)
        setcookie(
            'tigerstyle_whiskers_consent',
            json_encode($consent_data),
            time() + (365 * 24 * 60 * 60),
            '/',
            '',
            is_ssl(),
            false // Not HTTP-only so JavaScript can read it
        );
        
        // Log consent (for audit trail)
        $this->log_consent_change($consent_data, 'user_choice');
        
        // Trigger analytics integration if consent given
        if ($consent_data['analytics']) {
            $this->trigger_analytics_activation();
        }
        
        wp_send_json_success(array(
            'message' => __('Your preferences have been saved with feline precision!', 'tigerstyle-whiskers'),
            'consent' => $consent_data
        ));
    }
    
    /**
     * Log consent change for audit trail
     */
    private function log_consent_change($consent_data, $trigger) {
        if (class_exists('TigerStyleWhiskers_AuditTrail')) {
            TigerStyleWhiskers_AuditTrail::log_event(array(
                'event_type' => 'consent_change',
                'trigger' => $trigger,
                'consent_data' => $consent_data,
                'ip_hash' => $consent_data['ip_hash'],
                'user_agent_hash' => $consent_data['user_agent_hash'],
                'timestamp' => $consent_data['timestamp']
            ));
        }
    }
    
    /**
     * Trigger analytics activation
     */
    private function trigger_analytics_activation() {
        // Integrate with TigerStyle Heat if available
        if (class_exists('TigerStyleSEO_Google_setup')) {
            // Analytics can now be activated
            do_action('tigerstyle_whiskers_analytics_consent_granted');
        }
    }
    
    /**
     * Integrate with analytics
     */
    public function integrate_with_analytics() {
        // Check if analytics consent is given
        if ($this->has_analytics_consent()) {
            // Allow analytics to run
            add_filter('tigerstyle_heat_analytics_allowed', '__return_true');
        } else {
            // Block analytics
            add_filter('tigerstyle_heat_analytics_allowed', '__return_false');
            
            // Remove analytics hooks if GDPR applies
            if (TigerStyleWhiskers_BoundaryDetector::is_gdpr_territory()) {
                $this->block_analytics_until_consent();
            }
        }
    }
    
    /**
     * Check if analytics consent is given
     */
    public function has_analytics_consent() {
        return isset($this->consent_status['analytics']) && $this->consent_status['analytics'] === true;
    }
    
    /**
     * Block analytics until consent
     */
    private function block_analytics_until_consent() {
        // Remove Google Analytics injection
        if (class_exists('TigerStyleSEO_Google_setup')) {
            $google_setup = TigerStyleSEO_Google_setup::instance();
            remove_action('wp_head', array($google_setup, 'inject_google_analytics'), 2);
        }
        
        // Add placeholder script that activates after consent
        add_action('wp_head', array($this, 'inject_consent_conditional_analytics'), 2);
    }
    
    /**
     * Inject consent-conditional analytics
     */
    public function inject_consent_conditional_analytics() {
        if (!class_exists('TigerStyleSEO_Google_setup')) {
            return;
        }
        
        $analytics_id = get_option('google_analytics_id', '');
        if (empty($analytics_id)) {
            return;
        }
        
        ?>
        <!-- TigerStyle Whiskers: Consent-Conditional Analytics -->
        <script type="text/javascript">
        // Wait for consent before initializing analytics
        function tigerstyleWhiskersInitAnalytics() {
            if (tigerstyleWhiskersConsent.hasAnalyticsConsent()) {
                // Initialize Google Analytics
                <?php if (strpos($analytics_id, 'G-') === 0): ?>
                // GA4 Implementation
                var script = document.createElement('script');
                script.async = true;
                script.src = 'https://www.googletagmanager.com/gtag/js?id=<?php echo esc_js($analytics_id); ?>';
                document.head.appendChild(script);
                
                window.dataLayer = window.dataLayer || [];
                function gtag(){dataLayer.push(arguments);}
                gtag('js', new Date());
                gtag('config', '<?php echo esc_js($analytics_id); ?>');
                <?php endif; ?>
                
                console.log('TigerStyle Whiskers: Analytics activated with user consent!');
            }
        }
        
        // Check consent on page load
        document.addEventListener('DOMContentLoaded', tigerstyleWhiskersInitAnalytics);
        
        // Listen for consent changes
        document.addEventListener('tigerstyleWhiskersConsentChanged', tigerstyleWhiskersInitAnalytics);
        </script>
        <?php
    }
    
    /**
     * Get consent settings
     */
    private function get_consent_settings() {
        return array_merge(array(
            'banner_title' => '',
            'banner_message' => '',
            'privacy_policy_url' => '',
            'cookie_policy_url' => '',
            'banner_position' => 'bottom',
            'banner_style' => 'modern',
            'auto_hide_delay' => 0,
        ), get_option('tigerstyle_whiskers_consent_settings', array()));
    }
    
    /**
     * Handle settings update from admin
     */
    public function handle_settings_update() {
        // Verify nonce and permissions
        if (!wp_verify_nonce($_POST['consent_settings_nonce'], 'update_consent_settings') ||
            !current_user_can('manage_options')) {
            wp_die(__('Security check failed', 'tigerstyle-whiskers'));
        }
        
        $settings = array(
            'banner_title' => sanitize_text_field($_POST['banner_title'] ?? ''),
            'banner_message' => wp_kses_post($_POST['banner_message'] ?? ''),
            'privacy_policy_url' => esc_url_raw($_POST['privacy_policy_url'] ?? ''),
            'cookie_policy_url' => esc_url_raw($_POST['cookie_policy_url'] ?? ''),
            'banner_position' => sanitize_text_field($_POST['banner_position'] ?? 'bottom'),
            'banner_style' => sanitize_text_field($_POST['banner_style'] ?? 'modern'),
            'auto_hide_delay' => intval($_POST['auto_hide_delay'] ?? 0),
        );
        
        update_option('tigerstyle_whiskers_consent_settings', $settings);
        
        wp_redirect(admin_url('admin.php?page=tigerstyle-whiskers&tab=consent&message=settings_updated'));
        exit;
    }
    
    /**
     * Render admin settings page
     */
    public function render_admin_page() {
        $settings = $this->get_consent_settings();
        ?>
        <div class="tigerstyle-whiskers-admin-section">
            <h2><?php _e('Cookie Consent Management', 'tigerstyle-whiskers'); ?></h2>
            <p class="description">
                <?php _e('Configure cookie consent banners with feline finesse. These settings control how visitors give consent for data processing.', 'tigerstyle-whiskers'); ?>
            </p>
            
            <form method="post" action="<?php echo admin_url('admin-post.php'); ?>">
                <input type="hidden" name="action" value="update_cookie_consent_settings">
                <?php wp_nonce_field('update_consent_settings', 'consent_settings_nonce'); ?>
                
                <table class="form-table">
                    <tr>
                        <th scope="row">
                            <label for="banner_title"><?php _e('Banner Title', 'tigerstyle-whiskers'); ?></label>
                        </th>
                        <td>
                            <input type="text" 
                                   id="banner_title" 
                                   name="banner_title" 
                                   value="<?php echo esc_attr($settings['banner_title']); ?>" 
                                   class="regular-text" 
                                   placeholder="<?php _e('We Respect Your Privacy', 'tigerstyle-whiskers'); ?>">
                        </td>
                    </tr>
                    <tr>
                        <th scope="row">
                            <label for="banner_message"><?php _e('Banner Message', 'tigerstyle-whiskers'); ?></label>
                        </th>
                        <td>
                            <textarea id="banner_message" 
                                      name="banner_message" 
                                      rows="4" 
                                      class="large-text"
                                      placeholder="<?php echo esc_attr($this->get_default_banner_message()); ?>"><?php echo esc_textarea($settings['banner_message']); ?></textarea>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row">
                            <label for="privacy_policy_url"><?php _e('Privacy Policy URL', 'tigerstyle-whiskers'); ?></label>
                        </th>
                        <td>
                            <input type="url" 
                                   id="privacy_policy_url" 
                                   name="privacy_policy_url" 
                                   value="<?php echo esc_attr($settings['privacy_policy_url']); ?>" 
                                   class="regular-text"
                                   placeholder="<?php echo esc_attr(get_privacy_policy_url()); ?>">
                        </td>
                    </tr>
                </table>
                
                <?php submit_button(__('Save Consent Settings', 'tigerstyle-whiskers')); ?>
            </form>
        </div>
        <?php
    }
    
    /**
     * Get current consent status for external use
     */
    public function get_consent_status() {
        return $this->consent_status;
    }
    
    /**
     * Check if specific consent is given
     */
    public function has_consent_for($category) {
        return isset($this->consent_status[$category]) && $this->consent_status[$category] === true;
    }
}