// Enterprise OPA Gatekeeper policy management framework
package gatekeeper

import (
    "context"
    "encoding/json"
    "fmt"
    "sync"
    "time"
    
    "github.com/open-policy-agent/frameworks/constraint/pkg/client"
    "github.com/open-policy-agent/frameworks/constraint/pkg/types"
    admissionv1 "k8s.io/api/admission/v1"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/apimachinery/pkg/runtime"
    "sigs.k8s.io/controller-runtime/pkg/webhook/admission"
)

// EnterpriseGatekeeperManager provides comprehensive policy management
type EnterpriseGatekeeperManager struct {
    // Core components
    policyOrchestrator    *PolicyOrchestrator
    complianceManager     *ComplianceManager
    auditManager         *PolicyAuditManager
    
    // Multi-cluster management
    clusterRegistry      *ClusterRegistry
    policyDistributor    *PolicyDistributor
    globalPolicyStore    *GlobalPolicyStore
    
    // Advanced features
    policyAnalyzer       *PolicyAnalyzer
    conflictResolver     *PolicyConflictResolver
    impactAnalyzer       *PolicyImpactAnalyzer
    
    // Runtime components
    constraintClient     *client.Client
    evaluationCache      *PolicyEvaluationCache
    metricsCollector     *PolicyMetrics
    
    // Configuration
    config              *GatekeeperConfig
    
    // Thread safety
    mu                  sync.RWMutex
}

type GatekeeperConfig struct {
    // Multi-cluster settings
    EnableMultiCluster        bool
    ClusterSyncInterval      time.Duration
    PolicyPropagationMode    PolicyPropagationMode
    
    // Policy management
    PolicyValidationMode     PolicyValidationMode
    EnablePolicyVersioning   bool
    PolicyRollbackEnabled    bool
    
    // Performance settings
    EvaluationTimeout        time.Duration
    CacheSettings           *PolicyCacheConfig
    MaxConcurrentEvaluations int
    
    // Compliance settings
    ComplianceFrameworks     []string
    AuditRetentionDays       int
    ContinuousComplianceMode bool
    
    // Integration settings
    GitOpsIntegration       *GitOpsConfig
    CIIntegration          *CIIntegrationConfig
    NotificationChannels   []NotificationChannel
}

type PolicyPropagationMode string

const (
    PropagationModeImmediate PolicyPropagationMode = "immediate"
    PropagationModeScheduled PolicyPropagationMode = "scheduled"
    PropagationModeManual    PolicyPropagationMode = "manual"
)

// PolicyOrchestrator manages enterprise policy lifecycle
type PolicyOrchestrator struct {
    policyStore          *PolicyStore
    templateManager      *TemplateManager
    constraintManager    *ConstraintManager
    
    // Advanced features
    policyComposer       *PolicyComposer
    dependencyResolver   *PolicyDependencyResolver
    migrationManager     *PolicyMigrationManager
    
    // Validation and testing
    policyValidator      *PolicyValidator
    testRunner          *PolicyTestRunner
    impactSimulator     *PolicyImpactSimulator
}

// EvaluateAdmissionRequest processes admission requests with enterprise features
func (egm *EnterpriseGatekeeperManager) EvaluateAdmissionRequest(
    ctx context.Context, 
    req *admissionv1.AdmissionRequest,
) (*admissionv1.AdmissionResponse, error) {
    
    egm.mu.RLock()
    defer egm.mu.RUnlock()
    
    // Initialize evaluation context
    evalCtx := &PolicyEvaluationContext{
        Request:     req,
        ClusterInfo: egm.clusterRegistry.GetCurrentCluster(),
        Timestamp:   time.Now(),
        TraceID:     generateTraceID(),
    }
    
    // Get applicable policies
    policies, err := egm.policyOrchestrator.GetApplicablePolicies(ctx, evalCtx)
    if err != nil {
        return nil, fmt.Errorf("failed to get applicable policies: %w", err)
    }
    
    // Check evaluation cache
    if cached := egm.evaluationCache.Get(evalCtx); cached != nil {
        egm.metricsCollector.RecordCacheHit(evalCtx)
        return cached.Response, nil
    }
    
    // Perform policy evaluation
    evalResult, err := egm.evaluatePolicies(ctx, evalCtx, policies)
    if err != nil {
        return nil, fmt.Errorf("policy evaluation failed: %w", err)
    }
    
    // Generate admission response
    response := egm.generateAdmissionResponse(evalCtx, evalResult)
    
    // Cache evaluation result
    egm.evaluationCache.Set(evalCtx, &CachedEvaluation{
        Response:   response,
        Timestamp:  time.Now(),
        Policies:   policies,
    })
    
    // Record audit trail
    egm.auditManager.RecordPolicyEvaluation(evalCtx, evalResult, response)
    
    // Update metrics
    egm.metricsCollector.RecordPolicyEvaluation(evalCtx, evalResult)
    
    return response, nil
}

// evaluatePolicies performs comprehensive policy evaluation
func (egm *EnterpriseGatekeeperManager) evaluatePolicies(
    ctx context.Context,
    evalCtx *PolicyEvaluationContext,
    policies []*Policy,
) (*PolicyEvaluationResult, error) {
    
    result := &PolicyEvaluationResult{
        Context:    evalCtx,
        Violations: make([]*PolicyViolation, 0),
        Warnings:   make([]*PolicyWarning, 0),
        Mutations:  make([]*PolicyMutation, 0),
    }
    
    // Evaluate policies in dependency order
    orderedPolicies, err := egm.policyOrchestrator.dependencyResolver.ResolveDependencies(policies)
    if err != nil {
        return nil, fmt.Errorf("dependency resolution failed: %w", err)
    }
    
    for _, policy := range orderedPolicies {
        policyResult, err := egm.evaluatePolicy(ctx, evalCtx, policy)
        if err != nil {
            return nil, fmt.Errorf("policy evaluation failed for %s: %w", policy.Name, err)
        }
        
        // Merge results
        result.Violations = append(result.Violations, policyResult.Violations...)
        result.Warnings = append(result.Warnings, policyResult.Warnings...)
        result.Mutations = append(result.Mutations, policyResult.Mutations...)
        
        // Check for early termination
        if policy.FailurePolicy == FailurePolicyFail && len(policyResult.Violations) > 0 {
            break
        }
    }
    
    // Apply conflict resolution
    resolvedResult, err := egm.conflictResolver.ResolveConflicts(result)
    if err != nil {
        return nil, fmt.Errorf("conflict resolution failed: %w", err)
    }
    
    return resolvedResult, nil
}

// PolicyStore manages enterprise policy storage and retrieval
type PolicyStore struct {
    backend              PolicyBackend
    versionManager       *PolicyVersionManager
    encryptionManager    *PolicyEncryptionManager
    
    // Caching
    cache               *PolicyCache
    cacheInvalidator    *CacheInvalidator
    
    // Multi-tenancy
    tenantManager       *TenantManager
    accessController    *PolicyAccessController
}

// PolicyBackend defines the interface for policy storage backends
type PolicyBackend interface {
    Store(ctx context.Context, policy *Policy) error
    Retrieve(ctx context.Context, id string) (*Policy, error)
    List(ctx context.Context, filters *PolicyFilters) ([]*Policy, error)
    Delete(ctx context.Context, id string) error
    
    // Advanced operations
    CreateVersion(ctx context.Context, id string, version *PolicyVersion) error
    GetVersions(ctx context.Context, id string) ([]*PolicyVersion, error)
    RollbackToVersion(ctx context.Context, id string, version string) error
}

// GitPolicyBackend implements Git-based policy storage
type GitPolicyBackend struct {
    repoURL            string
    branch             string
    gitClient          GitClient
    
    // Encryption
    encryptionKey      []byte
    encryptedPaths     []string
    
    // Sync configuration
    syncInterval       time.Duration
    autoSync           bool
    
    // GitOps integration
    prCreator          *PullRequestCreator
    reviewRequirements *ReviewRequirements
}

func (gpb *GitPolicyBackend) Store(ctx context.Context, policy *Policy) error {
    // Validate policy
    if err := gpb.validatePolicy(policy); err != nil {
        return fmt.Errorf("policy validation failed: %w", err)
    }
    
    // Encrypt sensitive data if needed
    processedPolicy, err := gpb.processPolicy(policy)
    if err != nil {
        return fmt.Errorf("policy processing failed: %w", err)
    }
    
    // Create Git commit
    commit := &GitCommit{
        Message:    fmt.Sprintf("Add/Update policy: %s", policy.Name),
        Author:     policy.Author,
        Files:      gpb.generatePolicyFiles(processedPolicy),
        Branch:     gpb.branch,
    }
    
    // If auto-sync is enabled, commit directly
    if gpb.autoSync {
        return gpb.gitClient.Commit(ctx, commit)
    }
    
    // Otherwise, create pull request
    pr := &PullRequest{
        Title:       fmt.Sprintf("Policy Update: %s", policy.Name),
        Description: gpb.generatePRDescription(policy),
        Commits:     []*GitCommit{commit},
        Reviewers:   gpb.reviewRequirements.GetRequiredReviewers(policy),
    }
    
    return gpb.prCreator.CreatePullRequest(ctx, pr)
}

// TemplateManager manages constraint templates with enterprise features
type TemplateManager struct {
    templateStore        *TemplateStore
    regoCompiler         *RegoCompiler
    templateValidator    *TemplateValidator
    
    // Advanced features
    templateComposer     *TemplateComposer
    libraryManager       *TemplateLibraryManager
    versionManager       *TemplateVersionManager
    
    // Testing and validation
    testFramework        *TemplateTestFramework
    performanceAnalyzer  *TemplatePerformanceAnalyzer
    securityAnalyzer     *TemplateSecurityAnalyzer
}

// CreateConstraintTemplate creates a new constraint template with validation
func (tm *TemplateManager) CreateConstraintTemplate(
    ctx context.Context,
    template *ConstraintTemplate,
) error {
    
    // Comprehensive validation
    if err := tm.validateTemplate(ctx, template); err != nil {
        return fmt.Errorf("template validation failed: %w", err)
    }
    
    // Security analysis
    securityResult, err := tm.securityAnalyzer.AnalyzeTemplate(ctx, template)
    if err != nil {
        return fmt.Errorf("security analysis failed: %w", err)
    }
    
    if securityResult.HasCriticalIssues() {
        return fmt.Errorf("security issues found: %v", securityResult.CriticalIssues)
    }
    
    // Performance analysis
    perfResult, err := tm.performanceAnalyzer.AnalyzeTemplate(ctx, template)
    if err != nil {
        return fmt.Errorf("performance analysis failed: %w", err)
    }
    
    if perfResult.ExceedsThresholds() {
        return fmt.Errorf("performance thresholds exceeded: %v", perfResult.Issues)
    }
    
    // Compile Rego code
    compiledRego, err := tm.regoCompiler.Compile(template.Spec.Targets[0].Rego)
    if err != nil {
        return fmt.Errorf("rego compilation failed: %w", err)
    }
    
    template.CompiledRego = compiledRego
    
    // Store template
    return tm.templateStore.Store(ctx, template)
}

// validateTemplate performs comprehensive template validation
func (tm *TemplateManager) validateTemplate(
    ctx context.Context,
    template *ConstraintTemplate,
) error {
    
    // Basic structure validation
    if err := tm.templateValidator.ValidateStructure(template); err != nil {
        return fmt.Errorf("structure validation failed: %w", err)
    }
    
    // Rego code validation
    if err := tm.templateValidator.ValidateRego(template.Spec.Targets[0].Rego); err != nil {
        return fmt.Errorf("rego validation failed: %w", err)
    }
    
    // Schema validation
    if err := tm.templateValidator.ValidateSchema(template.Spec.CRD.Spec.Validation); err != nil {
        return fmt.Errorf("schema validation failed: %w", err)
    }
    
    // Dependency validation
    if err := tm.templateValidator.ValidateDependencies(template); err != nil {
        return fmt.Errorf("dependency validation failed: %w", err)
    }
    
    return nil
}

// ComplianceManager handles enterprise compliance requirements
type ComplianceManager struct {
    frameworks           map[string]*ComplianceFramework
    assessmentEngine     *ComplianceAssessmentEngine
    reportGenerator      *ComplianceReportGenerator
    
    // Continuous compliance
    continuousMonitor    *ContinuousComplianceMonitor
    alertManager         *ComplianceAlertManager
    remediationEngine    *ComplianceRemediationEngine
    
    // Evidence management
    evidenceCollector    *EvidenceCollector
    evidenceStore        *EvidenceStore
    evidenceValidator    *EvidenceValidator
}

type ComplianceFramework struct {
    Name                 string                    `json:"name"`
    Version              string                    `json:"version"`
    Controls             []*ComplianceControl      `json:"controls"`
    
    // Assessment configuration
    AssessmentFrequency  time.Duration             `json:"assessment_frequency"`
    AutomaticAssessment  bool                      `json:"automatic_assessment"`
    
    // Policy mapping
    PolicyMappings       []*PolicyMapping          `json:"policy_mappings"`
    RequiredPolicies     []string                  `json:"required_policies"`
    
    // Evidence requirements
    EvidenceTypes        []EvidenceType            `json:"evidence_types"`
    RetentionPeriod      time.Duration             `json:"retention_period"`
}

// AssessCompliance performs comprehensive compliance assessment
func (cm *ComplianceManager) AssessCompliance(
    ctx context.Context,
    framework string,
    scope *ComplianceScope,
) (*ComplianceAssessment, error) {
    
    fw, exists := cm.frameworks[framework]
    if !exists {
        return nil, fmt.Errorf("unknown compliance framework: %s", framework)
    }
    
    assessment := &ComplianceAssessment{
        Framework:   fw,
        Scope:      scope,
        Timestamp:  time.Now(),
        Results:    make(map[string]*ControlAssessment),
    }
    
    // Assess each control
    for _, control := range fw.Controls {
        controlResult, err := cm.assessmentEngine.AssessControl(ctx, control, scope)
        if err != nil {
            return nil, fmt.Errorf("control assessment failed for %s: %w", control.ID, err)
        }
        
        assessment.Results[control.ID] = controlResult
    }
    
    // Calculate overall compliance score
    assessment.OverallScore = cm.calculateComplianceScore(assessment.Results)
    assessment.ComplianceStatus = cm.determineComplianceStatus(assessment.OverallScore)
    
    // Collect evidence
    evidence, err := cm.evidenceCollector.CollectEvidence(ctx, assessment)
    if err != nil {
        return nil, fmt.Errorf("evidence collection failed: %w", err)
    }
    assessment.Evidence = evidence
    
    // Store assessment
    if err := cm.storeAssessment(ctx, assessment); err != nil {
        return nil, fmt.Errorf("assessment storage failed: %w", err)
    }
    
    return assessment, nil
}

// PolicyAnalyzer provides advanced policy analysis capabilities
type PolicyAnalyzer struct {
    impactAnalyzer       *PolicyImpactAnalyzer
    coverageAnalyzer     *PolicyCoverageAnalyzer
    conflictDetector     *PolicyConflictDetector
    
    // Performance analysis
    performanceProfiler  *PolicyPerformanceProfiler
    resourceAnalyzer     *PolicyResourceAnalyzer
    scalabilityAnalyzer  *PolicyScalabilityAnalyzer
    
    // Security analysis
    securityScanner      *PolicySecurityScanner
    vulnerabilityChecker *PolicyVulnerabilityChecker
    threatModeler        *PolicyThreatModeler
}

func (pa *PolicyAnalyzer) AnalyzePolicySet(
    ctx context.Context,
    policies []*Policy,
) (*PolicyAnalysisResult, error) {
    
    result := &PolicyAnalysisResult{
        Policies:   policies,
        Timestamp:  time.Now(),
        Analyses:   make(map[string]interface{}),
    }
    
    // Impact analysis
    impactResult, err := pa.impactAnalyzer.AnalyzeImpact(ctx, policies)
    if err != nil {
        return nil, fmt.Errorf("impact analysis failed: %w", err)
    }
    result.Analyses["impact"] = impactResult
    
    // Coverage analysis
    coverageResult, err := pa.coverageAnalyzer.AnalyzeCoverage(ctx, policies)
    if err != nil {
        return nil, fmt.Errorf("coverage analysis failed: %w", err)
    }
    result.Analyses["coverage"] = coverageResult
    
    // Conflict detection
    conflictResult, err := pa.conflictDetector.DetectConflicts(ctx, policies)
    if err != nil {
        return nil, fmt.Errorf("conflict detection failed: %w", err)
    }
    result.Analyses["conflicts"] = conflictResult
    
    // Performance analysis
    perfResult, err := pa.performanceProfiler.ProfilePolicies(ctx, policies)
    if err != nil {
        return nil, fmt.Errorf("performance analysis failed: %w", err)
    }
    result.Analyses["performance"] = perfResult
    
    // Security analysis
    securityResult, err := pa.securityScanner.ScanPolicies(ctx, policies)
    if err != nil {
        return nil, fmt.Errorf("security analysis failed: %w", err)
    }
    result.Analyses["security"] = securityResult
    
    return result, nil
}

# Enterprise Rego policy library with advanced patterns

package enterprise.policies.security

import future.keywords.if
import future.keywords.in

# Advanced security policy for container image validation
violation[{"msg": msg, "details": details}] if {
    # Multiple validation layers
    image_violations := check_image_security(input.review.object)
    count(image_violations) > 0
    
    msg := sprintf("Container image security violations: %v", [image_violations])
    details := {
        "violations": image_violations,
        "resource": input.review.object.metadata.name,
        "namespace": input.review.object.metadata.namespace
    }
}

# Comprehensive image security checking
check_image_security(resource) = violations if {
    containers := get_containers(resource)
    violations := [violation |
        container := containers[_]
        violation := check_container_image(container)
        violation != null
    ]
}

# Container image validation with multiple checks
check_container_image(container) = violation if {
    image := container.image
    
    # Registry validation
    not is_trusted_registry(image)
    violation := {
        "type": "untrusted_registry",
        "container": container.name,
        "image": image,
        "message": "Image from untrusted registry"
    }
} else = violation if {
    image := container.image
    
    # Tag validation
    uses_latest_tag(image)
    not input.parameters.allowLatestTag
    violation := {
        "type": "latest_tag",
        "container": container.name,
        "image": image,
        "message": "Latest tag not allowed"
    }
} else = violation if {
    image := container.image
    
    # Digest validation
    not has_digest(image)
    input.parameters.requireDigest
    violation := {
        "type": "missing_digest",
        "container": container.name,
        "image": image,
        "message": "Image digest required"
    }
} else = violation if {
    image := container.image
    
    # Vulnerability scanning results
    vuln_result := get_vulnerability_scan_result(image)
    vuln_result.critical_count > input.parameters.maxCriticalVulnerabilities
    violation := {
        "type": "vulnerability_threshold",
        "container": container.name,
        "image": image,
        "critical_vulns": vuln_result.critical_count,
        "message": sprintf("Critical vulnerabilities (%d) exceed threshold (%d)", 
                          [vuln_result.critical_count, input.parameters.maxCriticalVulnerabilities])
    }
}

# Advanced registry trust validation
is_trusted_registry(image) if {
    registry := get_registry(image)
    trusted_registry := input.parameters.trustedRegistries[_]
    
    # Support for pattern matching
    regex.match(trusted_registry.pattern, registry)
    
    # Check registry-specific requirements
    meets_registry_requirements(registry, trusted_registry)
}

# Registry-specific requirement validation
meets_registry_requirements(registry, trusted_config) if {
    # Check if registry requires authentication
    trusted_config.requiresAuth == false
} else if {
    # Validate authentication is present
    auth_present(registry)
    
    # Validate certificate if required
    trusted_config.requiresValidCert == false
    or valid_certificate(registry)
}

# Get vulnerability scan results (external data integration)
get_vulnerability_scan_result(image) = result if {
    # Integration with external vulnerability database
    scan_data := data.vulnerability_scans[image]
    result := {
        "critical_count": scan_data.vulnerabilities.critical,
        "high_count": scan_data.vulnerabilities.high,
        "medium_count": scan_data.vulnerabilities.medium,
        "low_count": scan_data.vulnerabilities.low,
        "scan_timestamp": scan_data.timestamp
    }
} else = {
    "critical_count": 999,  # Fail safe if no scan data
    "high_count": 999,
    "medium_count": 0,
    "low_count": 0,
    "scan_timestamp": ""
}

# Advanced resource requirement validation
violation[{"msg": msg, "details": details}] if {
    resource_violations := check_resource_requirements(input.review.object)
    count(resource_violations) > 0
    
    msg := sprintf("Resource requirement violations: %v", [resource_violations])
    details := {
        "violations": resource_violations,
        "resource": input.review.object.metadata.name
    }
}

check_resource_requirements(resource) = violations if {
    containers := get_containers(resource)
    violations := [violation |
        container := containers[_]
        violation := check_container_resources(container)
        violation != null
    ]
}

check_container_resources(container) = violation if {
    # CPU limit validation
    not container.resources.limits.cpu
    violation := {
        "type": "missing_cpu_limit",
        "container": container.name,
        "message": "CPU limit is required"
    }
} else = violation if {
    # Memory limit validation
    not container.resources.limits.memory
    violation := {
        "type": "missing_memory_limit",
        "container": container.name,
        "message": "Memory limit is required"
    }
} else = violation if {
    # CPU request validation
    not container.resources.requests.cpu
    violation := {
        "type": "missing_cpu_request",
        "container": container.name,
        "message": "CPU request is required"
    }
} else = violation if {
    # Memory request validation
    not container.resources.requests.memory
    violation := {
        "type": "missing_memory_request",
        "container": container.name,
        "message": "Memory request is required"
    }
} else = violation if {
    # Ratio validation
    cpu_limit := parse_cpu(container.resources.limits.cpu)
    cpu_request := parse_cpu(container.resources.requests.cpu)
    ratio := cpu_limit / cpu_request
    ratio > input.parameters.maxCpuRatio
    violation := {
        "type": "cpu_ratio_exceeded",
        "container": container.name,
        "ratio": ratio,
        "max_allowed": input.parameters.maxCpuRatio,
        "message": sprintf("CPU limit/request ratio %.2f exceeds maximum %.2f", 
                          [ratio, input.parameters.maxCpuRatio])
    }
}

# Advanced network policy validation
violation[{"msg": msg, "details": details}] if {
    input.review.kind.kind == "NetworkPolicy"
    network_violations := validate_network_policy(input.review.object)
    count(network_violations) > 0
    
    msg := sprintf("Network policy violations: %v", [network_violations])
    details := {
        "violations": network_violations,
        "policy": input.review.object.metadata.name
    }
}

validate_network_policy(policy) = violations if {
    violations := array.concat(
        validate_ingress_rules(policy),
        validate_egress_rules(policy)
    )
}

validate_ingress_rules(policy) = violations if {
    violations := [violation |
        rule := policy.spec.ingress[_]
        violation := validate_ingress_rule(rule, policy)
        violation != null
    ]
}

validate_ingress_rule(rule, policy) = violation if {
    # Check for overly permissive rules
    count(rule.from) == 0  # Allows from anywhere
    not is_system_namespace(policy.metadata.namespace)
    violation := {
        "type": "overly_permissive_ingress",
        "rule_index": rule_index,
        "message": "Ingress rule allows traffic from anywhere"
    }
} else = violation if {
    # Check for prohibited protocols
    port := rule.ports[_]
    port.protocol == "UDP"
    not input.parameters.allowUdpTraffic
    violation := {
        "type": "prohibited_protocol",
        "protocol": "UDP",
        "port": port.port,
        "message": "UDP traffic not allowed"
    }
}

# Advanced RBAC validation
violation[{"msg": msg, "details": details}] if {
    input.review.kind.kind in ["Role", "ClusterRole"]
    rbac_violations := validate_rbac_permissions(input.review.object)
    count(rbac_violations) > 0
    
    msg := sprintf("RBAC permission violations: %v", [rbac_violations])
    details := {
        "violations": rbac_violations,
        "role": input.review.object.metadata.name
    }
}

validate_rbac_permissions(role) = violations if {
    violations := [violation |
        rule := role.rules[_]
        violation := validate_rbac_rule(rule)
        violation != null
    ]
}

validate_rbac_rule(rule) = violation if {
    # Check for dangerous wildcards
    "*" in rule.verbs
    "*" in rule.resources
    violation := {
        "type": "dangerous_wildcard",
        "verbs": rule.verbs,
        "resources": rule.resources,
        "message": "Wildcard permissions on all resources are dangerous"
    }
} else = violation if {
    # Check for privilege escalation verbs
    dangerous_verb := input.parameters.dangerousVerbs[_]
    dangerous_verb in rule.verbs
    sensitive_resource := input.parameters.sensitiveResources[_]
    sensitive_resource in rule.resources
    violation := {
        "type": "privilege_escalation_risk",
        "verb": dangerous_verb,
        "resource": sensitive_resource,
        "message": sprintf("Dangerous verb '%s' on sensitive resource '%s'", 
                          [dangerous_verb, sensitive_resource])
    }
}

# Utility functions for advanced policy logic
get_containers(resource) = containers if {
    resource.spec.containers
    containers := resource.spec.containers
} else = containers if {
    resource.spec.template.spec.containers
    containers := resource.spec.template.spec.containers
} else = []

get_registry(image) = registry if {
    parts := split(image, "/")
    count(parts) > 1
    registry := parts[0]
} else = "docker.io"  # Default registry

uses_latest_tag(image) if {
    endswith(image, ":latest")
} else if {
    not contains(image, ":")
}

has_digest(image) if {
    contains(image, "@sha256:")
}

parse_cpu(cpu_string) = cpu_value if {
    # Convert CPU string to numeric value for comparison
    endswith(cpu_string, "m")
    number_part := trim_suffix(cpu_string, "m")
    cpu_value := to_number(number_part) / 1000
} else = cpu_value if {
    cpu_value := to_number(cpu_string)
}

is_system_namespace(namespace) if {
    namespace in {
        "kube-system",
        "kube-public",
        "kube-node-lease",
        "gatekeeper-system"
    }
}

auth_present(registry) if {
    # Check if registry authentication is configured
    data.registry_auth[registry]
}

valid_certificate(registry) if {
    # Check if registry has valid certificate
    cert_data := data.registry_certificates[registry]
    cert_data.valid == true
    cert_data.expiry > time.now_ns()
}

# Enterprise multi-cluster policy distribution configuration
apiVersion: v1
kind: ConfigMap
metadata:
  name: multi-cluster-policy-config
  namespace: gatekeeper-system
data:
  # Cluster registry configuration
  cluster-registry.yaml: |
    clusters:
      - name: "production-us-east"
        endpoint: "https://prod-us-east.k8s.company.com"
        region: "us-east-1"
        environment: "production"
        compliance_requirements:
          - "SOC2"
          - "PCI-DSS"
        policy_profiles:
          - "security-strict"
          - "compliance-financial"
        
      - name: "production-eu-west"
        endpoint: "https://prod-eu-west.k8s.company.com"
        region: "eu-west-1"
        environment: "production"
        compliance_requirements:
          - "GDPR"
          - "SOC2"
        policy_profiles:
          - "security-strict"
          - "compliance-gdpr"
        
      - name: "staging-us-east"
        endpoint: "https://staging-us-east.k8s.company.com"
        region: "us-east-1"
        environment: "staging"
        policy_profiles:
          - "security-medium"
          - "testing-policies"
    
    # Policy profile definitions
    policy_profiles:
      security-strict:
        policies:
          - "image-security-strict"
          - "resource-requirements-strict"
          - "network-policies-default-deny"
          - "rbac-least-privilege"
        enforcement_mode: "enforce"
        
      security-medium:
        policies:
          - "image-security-medium"
          - "resource-requirements-medium"
          - "rbac-basic"
        enforcement_mode: "warn"
        
      compliance-financial:
        policies:
          - "data-encryption-required"
          - "audit-logging-enhanced"
          - "access-controls-financial"
        enforcement_mode: "enforce"

  # Policy distribution configuration
  distribution-config.yaml: |
    distribution:
      strategy: "progressive"
      rollout_phases:
        - name: "canary"
          clusters: ["staging-us-east"]
          percentage: 100
          validation_period: "2h"
          
        - name: "production-phase1"
          clusters: ["production-us-east"]
          percentage: 50
          validation_period: "4h"
          
        - name: "production-phase2"
          clusters: ["production-us-east", "production-eu-west"]
          percentage: 100
          validation_period: "24h"
      
      failure_handling:
        strategy: "rollback"
        max_failures: 2
        failure_threshold: "5%"
        
      monitoring:
        enabled: true
        metrics_retention: "30d"
        alert_channels:
          - slack
          - pagerduty

---
# Multi-cluster policy distributor deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: policy-distributor
  namespace: gatekeeper-system
spec:
  replicas: 3
  selector:
    matchLabels:
      app: policy-distributor
  template:
    metadata:
      labels:
        app: policy-distributor
    spec:
      serviceAccountName: policy-distributor
      containers:
      - name: distributor
        image: registry.company.com/platform/policy-distributor:latest
        ports:
        - containerPort: 8080
          name: http
        - containerPort: 9090
          name: metrics
        env:
        - name: CONFIG_PATH
          value: "/config"
        - name: LOG_LEVEL
          value: "info"
        - name: CLUSTER_NAME
          value: "control-plane"
        volumeMounts:
        - name: config
          mountPath: /config
        - name: cluster-creds
          mountPath: /credentials
        resources:
          limits:
            cpu: 1
            memory: 2Gi
          requests:
            cpu: 200m
            memory: 512Mi
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
          periodSeconds: 30
        readinessProbe:
          httpGet:
            path: /ready
            port: 8080
          periodSeconds: 10
      volumes:
      - name: config
        configMap:
          name: multi-cluster-policy-config
      - name: cluster-creds
        secret:
          secretName: cluster-credentials

---
# Policy synchronization job
apiVersion: batch/v1
kind: CronJob
metadata:
  name: policy-sync
  namespace: gatekeeper-system
spec:
  schedule: "*/10 * * * *"  # Every 10 minutes
  jobTemplate:
    spec:
      template:
        spec:
          serviceAccountName: policy-sync
          containers:
          - name: sync
            image: registry.company.com/platform/policy-sync:latest
            command:
            - /bin/sh
            - -c
            - |
              # Comprehensive policy synchronization
              python3 /app/policy_sync.py \
                --config-path /config \
                --credentials-path /credentials \
                --sync-mode incremental \
                --validate-policies true \
                --dry-run false
            volumeMounts:
            - name: config
              mountPath: /config
            - name: cluster-creds
              mountPath: /credentials
            - name: policy-cache
              mountPath: /cache
            resources:
              limits:
                cpu: 500m
                memory: 1Gi
              requests:
                cpu: 100m
                memory: 256Mi
          volumes:
          - name: config
            configMap:
              name: multi-cluster-policy-config
          - name: cluster-creds
            secret:
              secretName: cluster-credentials
          - name: policy-cache
            persistentVolumeClaim:
              claimName: policy-cache-pvc
          restartPolicy: OnFailure

---
# Advanced constraint template for enterprise image security
apiVersion: templates.gatekeeper.sh/v1beta1
kind: ConstraintTemplate
metadata:
  name: enterpriseimagesecurity
  annotations:
    gatekeeper.sh/version: "v3.15.0"
    policy.company.com/category: "security"
    policy.company.com/severity: "critical"
    policy.company.com/compliance: "SOC2,PCI-DSS,GDPR"
spec:
  crd:
    spec:
      names:
        kind: EnterpriseImageSecurity
      validation:
        openAPIV3Schema:
          type: object
          properties:
            trustedRegistries:
              type: array
              items:
                type: object
                properties:
                  pattern:
                    type: string
                  requiresAuth:
                    type: boolean
                  requiresValidCert:
                    type: boolean
            allowLatestTag:
              type: boolean
            requireDigest:
              type: boolean
            maxCriticalVulnerabilities:
              type: integer
            exemptImages:
              type: array
              items:
                type: string
            dangerousVerbs:
              type: array
              items:
                type: string
            sensitiveResources:
              type: array
              items:
                type: string
            maxCpuRatio:
              type: number
            allowUdpTraffic:
              type: boolean
  targets:
    - target: admission.k8s.gatekeeper.sh
      rego: |
        # Include the advanced Rego code from above
        package enterpriseimagesecurity
        
        import future.keywords.if
        import future.keywords.in
        
        # All the Rego code from the previous section...
        # (The complete Rego code would be included here)

---
# Enterprise image security constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: EnterpriseImageSecurity
metadata:
  name: enterprise-image-security
spec:
  enforcementAction: deny
  match:
    kinds:
    - apiGroups: [""]
      kinds: ["Pod"]
    - apiGroups: ["apps"]
      kinds: ["Deployment", "StatefulSet", "DaemonSet"]
    excludedNamespaces:
    - kube-system
    - gatekeeper-system
    - cert-manager
  parameters:
    trustedRegistries:
    - pattern: "^registry\\.company\\.com/.*"
      requiresAuth: true
      requiresValidCert: true
    - pattern: "^gcr\\.io/company-project/.*"
      requiresAuth: true
      requiresValidCert: true
    allowLatestTag: false
    requireDigest: true
    maxCriticalVulnerabilities: 0
    exemptImages:
    - "registry.company.com/infrastructure/"
    - "gcr.io/gke-release/"
    dangerousVerbs:
    - "create"
    - "update"
    - "patch"
    - "delete"
    sensitiveResources:
    - "secrets"
    - "configmaps"
    - "serviceaccounts"
    - "roles"
    - "rolebindings"
    - "clusterroles"
    - "clusterrolebindings"
    maxCpuRatio: 4.0
    allowUdpTraffic: false

---
# Policy compliance monitoring
apiVersion: v1
kind: ConfigMap
metadata:
  name: compliance-monitoring-config
  namespace: gatekeeper-system
data:
  compliance-dashboard.yaml: |
    dashboards:
      - name: "SOC2 Compliance"
        controls:
          - id: "CC6.1"
            description: "Logical Access Controls"
            policies:
              - "enterprise-image-security"
              - "rbac-least-privilege"
            metrics:
              - "policy_violations_total"
              - "policy_evaluation_duration"
            
          - id: "CC6.2"
            description: "Authentication and Authorization"
            policies:
              - "rbac-least-privilege"
              - "service-account-restrictions"
            
      - name: "PCI-DSS Compliance"
        controls:
          - id: "Requirement 7"
            description: "Restrict access by business need-to-know"
            policies:
              - "rbac-least-privilege"
              - "network-segmentation"
            
      - name: "GDPR Compliance"
        controls:
          - id: "Article 32"
            description: "Security of processing"
            policies:
              - "data-encryption-required"
              - "audit-logging-enhanced"

  reporting-config.yaml: |
    reports:
      frequency: "daily"
      format: "json"
      delivery:
        - type: "s3"
          bucket: "company-compliance-reports"
          prefix: "gatekeeper/"
        - type: "email"
          recipients:
            - "security-team@company.com"
            - "compliance@company.com"
        - type: "slack"
          webhook: "https://hooks.slack.com/services/..."
          channel: "#security-alerts"
      
      retention:
        duration: "7y"  # 7 years for compliance
        encryption: true
        backup_locations:
          - "s3://company-compliance-backup/"
          - "gcs://company-compliance-archive/"

#!/bin/bash
# Enterprise policy testing and validation framework

set -euo pipefail

# Configuration
POLICY_TEST_DIR="/opt/policy-tests"
VALIDATION_RESULTS_DIR="/var/lib/policy-validation"
POLICY_REPO_DIR="/opt/policy-repository"
TEST_CLUSTER_CONFIG="/etc/test-clusters/config"

# Setup comprehensive policy testing framework
setup_policy_testing() {
    local test_scope="$1"
    local validation_level="${2:-comprehensive}"
    
    log_policy_event "INFO" "policy_testing" "setup" "started" "Scope: $test_scope, Level: $validation_level"
    
    # Setup test environments
    setup_test_environments "$test_scope"
    
    # Deploy policy testing framework
    deploy_policy_testing_framework "$test_scope" "$validation_level"
    
    # Configure automated testing pipelines
    configure_testing_pipelines "$test_scope"
    
    # Setup policy impact analysis
    setup_policy_impact_analysis "$test_scope"
    
    # Deploy policy simulation environment
    deploy_policy_simulation "$test_scope"
    
    log_policy_event "INFO" "policy_testing" "setup" "completed" "Scope: $test_scope"
}

# Deploy comprehensive policy testing framework
deploy_policy_testing_framework() {
    local test_scope="$1"
    local validation_level="$2"
    
    # Create policy testing namespace
    kubectl create namespace policy-testing --dry-run=client -o yaml | kubectl apply -f -
    
    # Deploy policy test runner
    kubectl apply -f - <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: policy-test-runner
  namespace: policy-testing
spec:
  replicas: 3
  selector:
    matchLabels:
      app: policy-test-runner
  template:
    metadata:
      labels:
        app: policy-test-runner
    spec:
      serviceAccountName: policy-test-runner
      containers:
      - name: test-runner
        image: registry.company.com/platform/policy-test-runner:latest
        ports:
        - containerPort: 8080
        env:
        - name: TEST_SCOPE
          value: "$test_scope"
        - name: VALIDATION_LEVEL
          value: "$validation_level"
        - name: POLICY_REPO_URL
          value: "https://git.company.com/platform/policies.git"
        - name: TEST_RESULTS_BACKEND
          value: "postgresql://test-results-db:5432/policy_tests"
        volumeMounts:
        - name: test-configs
          mountPath: /test-configs
        - name: policy-cache
          mountPath: /policy-cache
        - name: test-results
          mountPath: /test-results
        resources:
          limits:
            cpu: 2
            memory: 4Gi
          requests:
            cpu: 500m
            memory: 1Gi
      volumes:
      - name: test-configs
        configMap:
          name: policy-test-configs
      - name: policy-cache
        persistentVolumeClaim:
          claimName: policy-cache-pvc
      - name: test-results
        persistentVolumeClaim:
          claimName: test-results-pvc
EOF

    # Deploy policy validation service
    deploy_policy_validation_service "$test_scope"
    
    # Setup automated test scheduling
    setup_automated_test_scheduling "$test_scope"
}

# Create comprehensive policy test configurations
create_policy_test_configurations() {
    local test_scope="$1"
    
    kubectl create configmap policy-test-configs -n policy-testing --from-literal=test-suite.yaml="$(cat <<'EOF'
# Comprehensive policy test suite configuration
test_suites:
  - name: "security-policies"
    description: "Security policy validation tests"
    policies:
      - "enterprise-image-security"
      - "security-context-restrictions"
      - "network-policy-enforcement"
    test_cases:
      - name: "valid-secure-deployment"
        description: "Test valid deployment with security policies"
        resource_type: "Deployment"
        resource_spec: |
          apiVersion: apps/v1
          kind: Deployment
          metadata:
            name: secure-app
            namespace: test-namespace
          spec:
            replicas: 2
            selector:
              matchLabels:
                app: secure-app
            template:
              metadata:
                labels:
                  app: secure-app
              spec:
                containers:
                - name: app
                  image: registry.company.com/apps/secure-app@sha256:abc123
                  securityContext:
                    runAsNonRoot: true
                    runAsUser: 1000
                    allowPrivilegeEscalation: false
                    capabilities:
                      drop:
                      - ALL
                  resources:
                    limits:
                      cpu: 500m
                      memory: 512Mi
                    requests:
                      cpu: 100m
                      memory: 128Mi
        expected_result: "allowed"
        
      - name: "invalid-insecure-deployment"
        description: "Test deployment that should be rejected"
        resource_type: "Deployment"
        resource_spec: |
          apiVersion: apps/v1
          kind: Deployment
          metadata:
            name: insecure-app
            namespace: test-namespace
          spec:
            replicas: 1
            selector:
              matchLabels:
                app: insecure-app
            template:
              metadata:
                labels:
                  app: insecure-app
              spec:
                containers:
                - name: app
                  image: docker.io/nginx:latest
                  securityContext:
                    privileged: true
        expected_result: "denied"
        expected_violations:
          - "untrusted_registry"
          - "latest_tag"
          - "privileged_container"

  - name: "resource-governance"
    description: "Resource governance policy tests"
    policies:
      - "resource-requirements"
      - "resource-quotas"
    test_cases:
      - name: "valid-resource-limits"
        description: "Test deployment with proper resource limits"
        resource_type: "Deployment"
        expected_result: "allowed"
        
      - name: "missing-resource-requests"
        description: "Test deployment missing resource requests"
        resource_type: "Deployment"
        expected_result: "denied"
        expected_violations:
          - "missing_cpu_request"
          - "missing_memory_request"

  - name: "compliance-validation"
    description: "Compliance framework validation tests"
    compliance_frameworks:
      - "SOC2"
      - "PCI-DSS"
    test_cases:
      - name: "soc2-compliant-workload"
        description: "Test SOC2 compliant workload deployment"
        expected_result: "allowed"
        
      - name: "pci-dss-violation"
        description: "Test workload violating PCI-DSS requirements"
        expected_result: "denied"

# Performance testing configuration
performance_tests:
  enabled: true
  scenarios:
    - name: "high-volume-admission"
      description: "Test policy performance under high admission volume"
      concurrent_requests: 1000
      duration: "10m"
      target_latency_p99: "100ms"
      
    - name: "complex-policy-evaluation"
      description: "Test complex policy evaluation performance"
      policy_complexity: "high"
      target_evaluation_time: "50ms"

# Integration testing configuration
integration_tests:
  enabled: true
  external_systems:
    - name: "vulnerability_scanner"
      endpoint: "https://vuln-scanner.company.com/api"
      test_scenarios:
        - "scan_results_integration"
        - "real_time_blocking"
    
    - name: "compliance_dashboard"
      endpoint: "https://compliance.company.com/api"
      test_scenarios:
        - "compliance_reporting"
        - "audit_trail_validation"

# Chaos testing configuration
chaos_tests:
  enabled: true
  scenarios:
    - name: "gatekeeper_pod_failure"
      description: "Test policy enforcement during Gatekeeper pod failures"
      chaos_action: "pod_kill"
      target: "gatekeeper-controller-manager"
      
    - name: "network_partition"
      description: "Test policy behavior during network partitions"
      chaos_action: "network_partition"
      duration: "5m"

# Regression testing configuration
regression_tests:
  enabled: true
  baseline_policies: "v1.2.0"
  test_scenarios:
    - "policy_compatibility"
    - "performance_regression"
    - "security_regression"
EOF
)" --dry-run=client -o yaml | kubectl apply -f -
}

# Setup policy impact analysis
setup_policy_impact_analysis() {
    local test_scope="$1"
    
    # Deploy impact analysis service
    kubectl apply -f - <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: policy-impact-analyzer
  namespace: policy-testing
spec:
  replicas: 2
  selector:
    matchLabels:
      app: policy-impact-analyzer
  template:
    metadata:
      labels:
        app: policy-impact-analyzer
    spec:
      containers:
      - name: analyzer
        image: registry.company.com/platform/policy-impact-analyzer:latest
        ports:
        - containerPort: 8080
        env:
        - name: CLUSTER_CONFIGS
          value: "/cluster-configs"
        - name: ANALYSIS_MODE
          value: "comprehensive"
        volumeMounts:
        - name: cluster-configs
          mountPath: /cluster-configs
        - name: analysis-results
          mountPath: /analysis-results
        resources:
          limits:
            cpu: 1
            memory: 2Gi
          requests:
            cpu: 200m
            memory: 512Mi
      volumes:
      - name: cluster-configs
        secret:
          secretName: cluster-configs
      - name: analysis-results
        persistentVolumeClaim:
          claimName: analysis-results-pvc
EOF

    # Create impact analysis job
    create_impact_analysis_job "$test_scope"
}

# Create comprehensive impact analysis job
create_impact_analysis_job() {
    local test_scope="$1"
    
    kubectl apply -f - <<EOF
apiVersion: batch/v1
kind: CronJob
metadata:
  name: policy-impact-analysis
  namespace: policy-testing
spec:
  schedule: "0 2 * * *"  # Daily at 2 AM
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: analyzer
            image: registry.company.com/platform/policy-impact-analyzer:latest
            command:
            - /bin/sh
            - -c
            - |
              # Comprehensive policy impact analysis
              python3 /app/impact_analyzer.py \\
                --scope "$test_scope" \\
                --analysis-mode comprehensive \\
                --cluster-configs /cluster-configs \\
                --output-format json \\
                --include-recommendations true \\
                --include-risk-assessment true \\
                --generate-migration-plans true
            volumeMounts:
            - name: cluster-configs
              mountPath: /cluster-configs
            - name: analysis-results
              mountPath: /analysis-results
            resources:
              limits:
                cpu: 2
                memory: 4Gi
              requests:
                cpu: 500m
                memory: 1Gi
          volumes:
          - name: cluster-configs
            secret:
              secretName: cluster-configs
          - name: analysis-results
            persistentVolumeClaim:
              claimName: analysis-results-pvc
          restartPolicy: OnFailure
EOF
}

# Setup automated test scheduling
setup_automated_test_scheduling() {
    local test_scope="$1"
    
    # Create comprehensive test scheduling
    kubectl apply -f - <<EOF
apiVersion: batch/v1
kind: CronJob
metadata:
  name: policy-regression-tests
  namespace: policy-testing
spec:
  schedule: "0 */6 * * *"  # Every 6 hours
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: test-runner
            image: registry.company.com/platform/policy-test-runner:latest
            command:
            - /bin/sh
            - -c
            - |
              # Run comprehensive policy tests
              python3 /app/test_runner.py \\
                --test-suite regression \\
                --scope "$test_scope" \\
                --parallel-execution true \\
                --generate-reports true \\
                --upload-results true
            volumeMounts:
            - name: test-configs
              mountPath: /test-configs
            - name: test-results
              mountPath: /test-results
            resources:
              limits:
                cpu: 4
                memory: 8Gi
              requests:
                cpu: 1
                memory: 2Gi
          volumes:
          - name: test-configs
            configMap:
              name: policy-test-configs
          - name: test-results
            persistentVolumeClaim:
              claimName: test-results-pvc
          restartPolicy: OnFailure
EOF

    # Create performance test scheduling
    kubectl apply -f - <<EOF
apiVersion: batch/v1
kind: CronJob
metadata:
  name: policy-performance-tests
  namespace: policy-testing
spec:
  schedule: "0 1 * * 0"  # Weekly on Sunday at 1 AM
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: perf-tester
            image: registry.company.com/platform/policy-perf-tester:latest
            command:
            - /bin/sh
            - -c
            - |
              # Run performance tests
              python3 /app/perf_tester.py \\
                --test-duration 30m \\
                --concurrent-requests 1000 \\
                --target-latency-p99 100ms \\
                --generate-report true
            resources:
              limits:
                cpu: 8
                memory: 16Gi
              requests:
                cpu: 2
                memory: 4Gi
          restartPolicy: OnFailure
EOF
}

# Main policy testing function
main() {
    local command="$1"
    shift
    
    case "$command" in
        "setup")
            setup_policy_testing "$@"
            ;;
        "test")
            run_policy_tests "$@"
            ;;
        "validate")
            validate_policies "$@"
            ;;
        "analyze")
            analyze_policy_impact "$@"
            ;;
        "report")
            generate_test_reports "$@"
            ;;
        *)
            echo "Usage: $0 {setup|test|validate|analyze|report} [options]"
            exit 1
            ;;
    esac
}

# Execute main function
main "$@"

# Policy Engineering Career Progression
POLICY_ENGINEERING_LEVELS = [
    "Junior Policy Engineer",
    "Kubernetes Policy Engineer", 
    "Senior Policy Engineer",
    "Principal Governance Architect",
    "Distinguished Policy Engineer"
]

# Policy Specialization Areas
POLICY_SPECIALIZATIONS = [
    "Security Policy Engineering",
    "Compliance and Governance",
    "Multi-Cloud Policy Management",
    "DevSecOps Policy Integration",
    "Enterprise Risk Management"
]

# Industry Focus Areas
INDUSTRY_POLICY_TRACKS = [
    "Financial Services Compliance",
    "Healthcare Governance",
    "Government and Public Sector",
    "Critical Infrastructure Policy"
]

# Example: Policy library contributions
apiVersion: v1
kind: ConfigMap
metadata:
  name: policy-portfolio-examples
data:
  advanced-rego-library.yaml: |
    # Contributed advanced Rego policy library for enterprise compliance
    # Features: Multi-framework compliance, automated testing, performance optimization
    
  multi-cluster-orchestrator.yaml: |
    # Created multi-cluster policy orchestration framework
    # Features: Progressive rollouts, conflict resolution, impact analysis
    
  compliance-automation.yaml: |
    # Developed automated compliance validation and reporting system
    # Features: Real-time compliance monitoring, audit trail generation