/**
 * Descomplicar® Crescimento Digital
 * https://descomplicar.pt
 */

<?php
/**
 * Integration test for CSS injection on wp_head
 *
 * @package CareBookingBlock
 */

/**
 * Test CSS injection functionality on wp_head hook
 */
class Test_CSS_Injection extends Care_Booking_Test_Case
{

    /**
     * Test wp_head hook is registered for CSS injection
     */
    public function test_wp_head_hook_registered()
    {
        $this->assertTrue(has_action('wp_head'), 'wp_head hook should have registered actions');
        
        // Check if our specific CSS injection hook is registered
        $wp_head_callbacks = $GLOBALS['wp_filter']['wp_head']->callbacks;
        $found_css_injection = false;
        
        foreach ($wp_head_callbacks as $priority => $callbacks) {
            foreach ($callbacks as $callback) {
                if (is_array($callback['function']) && 
                    isset($callback['function'][0]) &&
                    is_object($callback['function'][0]) &&
                    method_exists($callback['function'][0], 'inject_restriction_css')) {
                    $found_css_injection = true;
                    $this->assertEquals(20, $priority, 'CSS injection should have priority 20 (after theme styles)');
                    break 2;
                }
            }
        }
        
        $this->assertTrue($found_css_injection, 'CSS injection callback should be registered on wp_head');
    }

    /**
     * Test CSS injection generates correct styles for blocked doctors
     */
    public function test_css_injection_blocked_doctors()
    {
        // Create test restrictions
        $this->create_test_doctor_restriction(999, true);
        $this->create_test_doctor_restriction(998, true);
        $this->create_test_doctor_restriction(997, false); // Not blocked
        
        // Capture CSS output
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        // Should contain CSS for blocked doctors
        $this->assertStringContainsString('.kivicare-doctor[data-doctor-id="999"]', $head_output, 
            'Should contain CSS selector for blocked doctor 999');
        $this->assertStringContainsString('.kivicare-doctor[data-doctor-id="998"]', $head_output, 
            'Should contain CSS selector for blocked doctor 998');
        $this->assertStringNotContainsString('.kivicare-doctor[data-doctor-id="997"]', $head_output, 
            'Should NOT contain CSS selector for non-blocked doctor 997');
        
        // Should contain display: none directive
        $this->assertStringContainsString('display: none !important;', $head_output, 
            'Should contain display: none !important directive');
        
        // Should be wrapped in style tags with proper data attribute
        $this->assertStringContainsString('<style data-care-booking>', $head_output, 
            'Should contain opening style tag with data attribute');
        $this->assertStringContainsString('</style>', $head_output, 
            'Should contain closing style tag');
    }

    /**
     * Test CSS injection generates correct styles for blocked services
     */
    public function test_css_injection_blocked_services()
    {
        // Create test service restrictions
        $this->create_test_service_restriction(888, 999, true);  // Block service 888 for doctor 999
        $this->create_test_service_restriction(887, 998, true);  // Block service 887 for doctor 998
        $this->create_test_service_restriction(886, 999, false); // Don't block service 886 for doctor 999
        
        // Capture CSS output
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        // Should contain CSS for blocked services with doctor context
        $this->assertStringContainsString('.kivicare-service[data-service-id="888"][data-doctor-id="999"]', $head_output, 
            'Should contain CSS selector for service 888 blocked for doctor 999');
        $this->assertStringContainsString('.kivicare-service[data-service-id="887"][data-doctor-id="998"]', $head_output, 
            'Should contain CSS selector for service 887 blocked for doctor 998');
        
        // Should NOT contain CSS for non-blocked service
        $this->assertStringNotContainsString('[data-service-id="886"]', $head_output, 
            'Should NOT contain CSS selector for non-blocked service 886');
        
        // Should contain display: none directive
        $this->assertStringContainsString('display: none !important;', $head_output);
    }

    /**
     * Test CSS injection includes fallback selectors
     */
    public function test_css_injection_fallback_selectors()
    {
        // Create test restrictions
        $this->create_test_doctor_restriction(999, true);
        $this->create_test_service_restriction(888, 999, true);
        
        // Capture CSS output
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        // Should include fallback ID selectors
        $this->assertStringContainsString('#doctor-999', $head_output, 
            'Should include fallback ID selector for doctor');
        $this->assertStringContainsString('#service-888-doctor-999', $head_output, 
            'Should include fallback ID selector for service');
        
        // Should include fallback option selectors
        $this->assertStringContainsString('.doctor-selection option[value="999"]', $head_output, 
            'Should include fallback option selector for doctor');
        $this->assertStringContainsString('.service-selection option[value="888"]', $head_output, 
            'Should include fallback option selector for service');
    }

    /**
     * Test CSS injection handles empty restrictions
     */
    public function test_css_injection_empty_restrictions()
    {
        // No restrictions created
        
        // Capture CSS output
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        // Should still output style tags but with minimal content
        if (strpos($head_output, '<style data-care-booking>') !== false) {
            $this->assertStringContainsString('<style data-care-booking>', $head_output);
            $this->assertStringContainsString('</style>', $head_output);
            
            // Content should be minimal (just comments or empty)
            $style_content = $this->extract_style_content($head_output);
            $this->assertLessThan(100, strlen(trim($style_content)), 
                'Style content should be minimal when no restrictions exist');
        } else {
            // Or no style output at all is also acceptable
            $this->assertStringNotContainsString('data-care-booking', $head_output, 
                'No CSS should be output when no restrictions exist');
        }
    }

    /**
     * Test CSS injection uses cache for performance
     */
    public function test_css_injection_uses_cache()
    {
        // Create test restrictions
        $this->create_test_doctor_restriction(999, true);
        
        // Pre-populate cache
        $blocked_doctors = [999];
        $blocked_services = [];
        set_transient('care_booking_doctors_blocked', $blocked_doctors, 3600);
        
        // Measure performance with cache
        $start_time = microtime(true);
        
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        $end_time = microtime(true);
        $execution_time = ($end_time - $start_time) * 1000;
        
        // Should be very fast with cache (under 50ms)
        $this->assertLessThan(50, $execution_time, 'CSS injection should be fast with cache');
        
        // Should contain correct CSS
        $this->assertStringContainsString('.kivicare-doctor[data-doctor-id="999"]', $head_output);
    }

    /**
     * Test CSS injection handles database errors gracefully
     */
    public function test_css_injection_handles_database_errors()
    {
        // Create test restrictions first
        $this->create_test_doctor_restriction(999, true);
        
        // Mock database error
        global $wpdb;
        $original_prefix = $wpdb->prefix;
        $wpdb->prefix = 'invalid_prefix_';
        
        // Clear cache to force database query
        delete_transient('care_booking_doctors_blocked');
        
        // CSS injection should handle error gracefully
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        // Restore prefix
        $wpdb->prefix = $original_prefix;
        
        // Should not throw fatal errors
        $this->assertTrue(true, 'CSS injection should handle database errors without fatal errors');
        
        // May contain minimal or no CSS output due to error
        if (strpos($head_output, '<style') !== false) {
            $this->assertStringContainsString('<style', $head_output, 'Should contain style tags even on error');
        }
    }

    /**
     * Test CSS injection output is properly escaped and secure
     */
    public function test_css_injection_security()
    {
        // Create test restrictions with edge case IDs
        $this->create_test_doctor_restriction(999, true);
        
        // Capture CSS output
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        // Should not contain any unescaped content
        $this->assertStringNotContainsString('<script', $head_output, 'Should not contain script tags');
        $this->assertStringNotContainsString('javascript:', $head_output, 'Should not contain javascript: protocol');
        $this->assertStringNotContainsString('expression(', $head_output, 'Should not contain CSS expressions');
        
        // Should contain proper CSS syntax
        $this->assertRegExp('/\{[^}]*display:\s*none\s*!important[^}]*\}/', $head_output, 
            'Should contain proper CSS syntax for display:none');
    }

    /**
     * Test CSS injection only occurs on frontend pages
     */
    public function test_css_injection_frontend_only()
    {
        $this->create_test_doctor_restriction(999, true);
        
        // Test admin context
        set_current_screen('edit-post');
        
        ob_start();
        do_action('wp_head');
        $admin_output = ob_get_clean();
        
        // Test frontend context
        set_current_screen('front');
        
        ob_start();
        do_action('wp_head');
        $frontend_output = ob_get_clean();
        
        // CSS should be injected on frontend but policy may vary for admin
        // At minimum, it should work on frontend
        if (strpos($frontend_output, '<style data-care-booking>') !== false) {
            $this->assertStringContainsString('.kivicare-doctor[data-doctor-id="999"]', $frontend_output, 
                'CSS should be injected on frontend');
        }
        
        // Admin behavior may vary based on implementation
        $this->assertTrue(true, 'CSS injection should handle admin vs frontend context appropriately');
    }

    /**
     * Test CSS injection performance with large restriction sets
     */
    public function test_css_injection_performance_large_dataset()
    {
        // Create many restrictions
        for ($i = 1000; $i <= 1100; $i++) {
            $this->create_test_doctor_restriction($i, true);
        }
        
        for ($i = 2000; $i <= 2050; $i++) {
            $this->create_test_service_restriction($i, 1000, true);
        }
        
        $start_time = microtime(true);
        
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        $end_time = microtime(true);
        $execution_time = ($end_time - $start_time) * 1000;
        
        // Should complete in reasonable time even with large datasets (under 200ms)
        $this->assertLessThan(200, $execution_time, 'CSS injection should handle large datasets efficiently');
        
        // Should contain CSS for many restrictions
        $this->assertStringContainsString('.kivicare-doctor[data-doctor-id="1000"]', $head_output);
        $this->assertStringContainsString('.kivicare-service[data-service-id="2000"]', $head_output);
        
        // CSS should be reasonably sized (under 100KB)
        $this->assertLessThan(100000, strlen($head_output), 'Generated CSS should be reasonably sized');
    }

    /**
     * Test CSS injection minification and optimization
     */
    public function test_css_injection_optimization()
    {
        // Create test restrictions
        $this->create_test_doctor_restriction(999, true);
        $this->create_test_doctor_restriction(998, true);
        $this->create_test_service_restriction(888, 999, true);
        
        ob_start();
        do_action('wp_head');
        $head_output = ob_get_clean();
        
        $style_content = $this->extract_style_content($head_output);
        
        // Should combine selectors efficiently
        $doctor_selectors = substr_count($style_content, '.kivicare-doctor');
        $this->assertGreaterThan(0, $doctor_selectors, 'Should contain doctor selectors');
        
        // Should minimize redundant CSS
        $display_none_count = substr_count($style_content, 'display: none !important');
        $this->assertGreaterThan(0, $display_none_count, 'Should contain display:none declarations');
        
        // Should not contain excessive whitespace if minified
        if (strpos($style_content, '  ') === false) {
            $this->assertTrue(true, 'CSS appears to be minified');
        }
    }

    /**
     * Test CSS injection cache invalidation
     */
    public function test_css_injection_cache_invalidation()
    {
        // Create initial restriction
        $this->create_test_doctor_restriction(999, true);
        
        // Generate initial CSS
        ob_start();
        do_action('wp_head');
        $initial_output = ob_get_clean();
        
        $this->assertStringContainsString('data-doctor-id="999"', $initial_output);
        
        // Add new restriction (should invalidate cache)
        $this->create_test_doctor_restriction(998, true);
        
        // Simulate cache invalidation
        delete_transient('care_booking_doctors_blocked');
        delete_transient('care_booking_restrictions_hash');
        
        // Generate CSS again
        ob_start();
        do_action('wp_head');
        $updated_output = ob_get_clean();
        
        // Should now include both doctors
        $this->assertStringContainsString('data-doctor-id="999"', $updated_output);
        $this->assertStringContainsString('data-doctor-id="998"', $updated_output);
    }

    /**
     * Helper method to extract style content from HTML
     */
    private function extract_style_content($html)
    {
        if (preg_match('/<style[^>]*data-care-booking[^>]*>(.*?)<\/style>/s', $html, $matches)) {
            return $matches[1];
        }
        return '';
    }
}