package velocity

import (
    "context"
    "fmt"
    "os/exec"
    "path/filepath"
    "sync"
    "time"
)

// DevelopmentVelocityFramework orchestrates comprehensive automation
// for enterprise Go development, covering code generation, testing,
// deployment, and operational tasks
type DevelopmentVelocityFramework struct {
    // Code generation and scaffolding
    codeGenerator      *CodeGenerator
    scaffoldGenerator  *ScaffoldGenerator
    templateEngine     *TemplateEngine

    // Development workflow automation
    workflowEngine     *WorkflowEngine
    taskAutomation     *TaskAutomation
    buildAutomation    *BuildAutomation

    // Quality automation
    testAutomation     *TestAutomation
    lintAutomation     *LintAutomation
    securityScanner    *SecurityScanner

    // Deployment automation
    deploymentEngine   *DeploymentEngine
    infrastructureCode *InfrastructureAsCode

    // Monitoring and feedback
    metricsCollector   *VelocityMetrics
    feedbackLoop       *FeedbackLoop

    config             *VelocityConfig
}

type VelocityConfig struct {
    // Automation settings
    EnableCodeGeneration    bool
    EnableAutoTesting       bool
    EnableAutoDeployment    bool
    EnableContinuousProfile bool

    // Performance thresholds
    MaxBuildTime           time.Duration
    MaxTestTime            time.Duration
    MaxDeployTime          time.Duration

    // Quality gates
    MinTestCoverage        float64
    MaxComplexityScore     int
    RequiredLinters        []string

    // Productivity features
    EnableHotReload        bool
    EnableIncrementalBuild bool
    EnableParallelTasks    bool
}

func NewDevelopmentVelocityFramework(config *VelocityConfig) *DevelopmentVelocityFramework {
    return &DevelopmentVelocityFramework{
        codeGenerator:     NewCodeGenerator(config.CodeGenConfig),
        scaffoldGenerator: NewScaffoldGenerator(config.ScaffoldConfig),
        templateEngine:    NewTemplateEngine(config.TemplateConfig),
        workflowEngine:    NewWorkflowEngine(config.WorkflowConfig),
        taskAutomation:    NewTaskAutomation(config.TaskConfig),
        buildAutomation:   NewBuildAutomation(config.BuildConfig),
        testAutomation:    NewTestAutomation(config.TestConfig),
        lintAutomation:    NewLintAutomation(config.LintConfig),
        securityScanner:   NewSecurityScanner(config.SecurityConfig),
        deploymentEngine:  NewDeploymentEngine(config.DeployConfig),
        infrastructureCode: NewInfrastructureAsCode(config.InfraConfig),
        metricsCollector:  NewVelocityMetrics(),
        feedbackLoop:      NewFeedbackLoop(),
        config:            config,
    }
}

// CodeGenerator automatically generates boilerplate code based on patterns
type CodeGenerator struct {
    templates       map[string]*Template
    generators      map[string]Generator
    validators      map[string]Validator

    // AI-assisted generation
    aiCodeAssistant *AICodeAssistant
    patternLibrary  *PatternLibrary

    config          *CodeGeneratorConfig
}

type CodeGeneratorConfig struct {
    // Template settings
    TemplateDirectory   string
    CustomTemplates     map[string]string
    EnableAIAssistance  bool

    // Generation rules
    NamingConventions   NamingRules
    PackageStructure    PackageRules
    GenerationRules     []GenerationRule

    // Quality settings
    ValidateGenerated   bool
    FormatGenerated     bool
    TestGenerated       bool
}

type GenerationRule struct {
    Pattern     string
    Template    string
    Conditions  []Condition
    PostActions []Action
}

// Generate creates code based on specifications
func (cg *CodeGenerator) Generate(ctx context.Context, spec *GenerationSpec) (*GeneratedCode, error) {
    start := time.Now()

    result := &GeneratedCode{
        Spec:        spec,
        GeneratedAt: start,
        Files:       make(map[string]string),
        Metadata:    make(map[string]interface{}),
    }

    // Determine generation strategy
    strategy, err := cg.selectGenerationStrategy(spec)
    if err != nil {
        return nil, fmt.Errorf("failed to select generation strategy: %w", err)
    }

    // Generate base code
    baseCode, err := strategy.Generate(ctx, spec)
    if err != nil {
        return nil, fmt.Errorf("base code generation failed: %w", err)
    }

    result.Files = baseCode

    // AI-assisted enhancement if enabled
    if cg.config.EnableAIAssistance {
        enhanced, err := cg.aiCodeAssistant.EnhanceGenerated(ctx, baseCode, spec)
        if err != nil {
            // Log warning but don't fail generation
            log.Printf("AI enhancement failed: %v", err)
        } else {
            result.Files = enhanced
            result.Metadata["ai_enhanced"] = true
        }
    }

    // Validate generated code
    if cg.config.ValidateGenerated {
        if err := cg.validateGenerated(result.Files); err != nil {
            return nil, fmt.Errorf("generated code validation failed: %w", err)
        }
    }

    // Format generated code
    if cg.config.FormatGenerated {
        formatted, err := cg.formatCode(result.Files)
        if err != nil {
            return nil, fmt.Errorf("code formatting failed: %w", err)
        }
        result.Files = formatted
    }

    // Generate tests if requested
    if cg.config.TestGenerated && spec.GenerateTests {
        tests, err := cg.generateTests(ctx, result.Files, spec)
        if err != nil {
            return nil, fmt.Errorf("test generation failed: %w", err)
        }

        for filename, content := range tests {
            result.Files[filename] = content
        }
    }

    result.GenerationTime = time.Since(start)
    return result, nil
}

// CRUD Generator example for rapid API development
type CRUDGenerator struct {
    entityTemplate    *Template
    serviceTemplate   *Template
    handlerTemplate   *Template
    repositoryTemplate *Template
    testTemplate      *Template

    config            *CRUDGeneratorConfig
}

type CRUDGeneratorConfig struct {
    PackageStructure  string
    DatabaseType      string
    APIStyle          string // REST, GraphQL, gRPC
    IncludeValidation bool
    IncludeAuth       bool
    IncludeCaching    bool
    IncludeMetrics    bool
}

func (crud *CRUDGenerator) GenerateEntity(spec *EntitySpec) (*GeneratedCode, error) {
    entityData := struct {
        EntityName    string
        PackageName   string
        Fields        []Field
        Validations   []Validation
        Relationships []Relationship
        Indexes       []Index
    }{
        EntityName:    spec.Name,
        PackageName:   spec.Package,
        Fields:        spec.Fields,
        Validations:   spec.Validations,
        Relationships: spec.Relationships,
        Indexes:       spec.Indexes,
    }

    files := make(map[string]string)

    // Generate entity model
    entityCode, err := crud.entityTemplate.Execute(entityData)
    if err != nil {
        return nil, fmt.Errorf("entity template execution failed: %w", err)
    }
    files[fmt.Sprintf("%s.go", strings.ToLower(spec.Name))] = entityCode

    // Generate repository interface and implementation
    repoCode, err := crud.repositoryTemplate.Execute(entityData)
    if err != nil {
        return nil, fmt.Errorf("repository template execution failed: %w", err)
    }
    files[fmt.Sprintf("%s_repository.go", strings.ToLower(spec.Name))] = repoCode

    // Generate service layer
    serviceCode, err := crud.serviceTemplate.Execute(entityData)
    if err != nil {
        return nil, fmt.Errorf("service template execution failed: %w", err)
    }
    files[fmt.Sprintf("%s_service.go", strings.ToLower(spec.Name))] = serviceCode

    // Generate HTTP handlers
    handlerCode, err := crud.handlerTemplate.Execute(entityData)
    if err != nil {
        return nil, fmt.Errorf("handler template execution failed: %w", err)
    }
    files[fmt.Sprintf("%s_handler.go", strings.ToLower(spec.Name))] = handlerCode

    // Generate tests
    testCode, err := crud.testTemplate.Execute(entityData)
    if err != nil {
        return nil, fmt.Errorf("test template execution failed: %w", err)
    }
    files[fmt.Sprintf("%s_test.go", strings.ToLower(spec.Name))] = testCode

    return &GeneratedCode{
        Files:       files,
        Metadata:    map[string]interface{}{"generator": "crud", "entity": spec.Name},
        GeneratedAt: time.Now(),
    }, nil
}

// Workflow automation for development tasks
type WorkflowEngine struct {
    workflows       map[string]*Workflow
    triggers        map[string][]Trigger
    executors       map[string]Executor

    // Parallel execution
    workerPool      *WorkerPool
    taskQueue       *TaskQueue

    // Monitoring
    metricsCollector *WorkflowMetrics

    config          *WorkflowConfig
}

type Workflow struct {
    ID          string
    Name        string
    Description string
    Version     string

    // Execution definition
    Steps       []WorkflowStep
    Triggers    []Trigger
    Schedule    *Schedule

    // Configuration
    Timeout     time.Duration
    Retries     int
    Parallelism int

    // Conditions
    Conditions  []Condition
    Variables   map[string]interface{}
}

type WorkflowStep struct {
    ID          string
    Name        string
    Type        StepType
    Config      map[string]interface{}

    // Dependencies
    DependsOn   []string
    Conditions  []Condition

    // Error handling
    OnError     ErrorAction
    Retries     int
    Timeout     time.Duration
}

type StepType int

const (
    StepTypeBuild StepType = iota
    StepTypeTest
    StepTypeLint
    StepTypeSecurity
    StepTypeDeploy
    StepTypeNotify
    StepTypeCustom
)

// Example: Automated development workflow
func (we *WorkflowEngine) CreateDevelopmentWorkflow() *Workflow {
    return &Workflow{
        ID:          "development-workflow",
        Name:        "Automated Development Workflow",
        Description: "Automated workflow for code changes",
        Version:     "1.0.0",
        Timeout:     30 * time.Minute,
        Retries:     3,
        Parallelism: 4,
        Triggers: []Trigger{
            {
                Type:   TriggerTypeGitPush,
                Config: map[string]interface{}{"branches": []string{"main", "develop"}},
            },
            {
                Type:   TriggerTypePullRequest,
                Config: map[string]interface{}{"action": "opened"},
            },
        },
        Steps: []WorkflowStep{
            {
                ID:   "format-check",
                Name: "Format Check",
                Type: StepTypeCustom,
                Config: map[string]interface{}{
                    "command": "gofmt -d .",
                    "fail_on_diff": true,
                },
                Timeout: 2 * time.Minute,
            },
            {
                ID:   "lint",
                Name: "Lint Code",
                Type: StepTypeLint,
                Config: map[string]interface{}{
                    "linters": []string{"golangci-lint", "staticcheck", "gosec"},
                },
                DependsOn: []string{"format-check"},
                Timeout:   5 * time.Minute,
            },
            {
                ID:   "build",
                Name: "Build Application",
                Type: StepTypeBuild,
                Config: map[string]interface{}{
                    "targets": []string{"linux/amd64", "darwin/amd64"},
                    "ldflags": "-w -s",
                },
                DependsOn: []string{"lint"},
                Timeout:   5 * time.Minute,
            },
            {
                ID:   "unit-tests",
                Name: "Unit Tests",
                Type: StepTypeTest,
                Config: map[string]interface{}{
                    "packages":    "./...",
                    "coverage":    true,
                    "race":        true,
                    "min_coverage": 80.0,
                },
                DependsOn: []string{"build"},
                Timeout:   10 * time.Minute,
            },
            {
                ID:   "integration-tests",
                Name: "Integration Tests",
                Type: StepTypeTest,
                Config: map[string]interface{}{
                    "tags":       "integration",
                    "timeout":    "15m",
                    "parallel":   4,
                },
                DependsOn: []string{"unit-tests"},
                Timeout:   20 * time.Minute,
            },
            {
                ID:   "security-scan",
                Name: "Security Scan",
                Type: StepTypeSecurity,
                Config: map[string]interface{}{
                    "scanners": []string{"gosec", "nancy", "trivy"},
                    "fail_on": "high",
                },
                DependsOn: []string{"build"},
                Timeout:   5 * time.Minute,
            },
            {
                ID:   "performance-tests",
                Name: "Performance Tests",
                Type: StepTypeTest,
                Config: map[string]interface{}{
                    "benchmarks": true,
                    "cpu_prof":   true,
                    "mem_prof":   true,
                    "duration":   "5m",
                },
                DependsOn: []string{"unit-tests"},
                Timeout:   10 * time.Minute,
            },
        },
    }
}

func (we *WorkflowEngine) ExecuteWorkflow(ctx context.Context, workflowID string, params map[string]interface{}) (*WorkflowExecution, error) {
    workflow, exists := we.workflows[workflowID]
    if !exists {
        return nil, fmt.Errorf("workflow not found: %s", workflowID)
    }

    execution := &WorkflowExecution{
        ID:          generateExecutionID(),
        WorkflowID:  workflowID,
        StartTime:   time.Now(),
        Status:      ExecutionStatusRunning,
        Parameters:  params,
        StepResults: make(map[string]*StepResult),
    }

    // Execute steps based on dependency graph
    stepGraph := we.buildStepGraph(workflow.Steps)

    err := we.executeStepGraph(ctx, stepGraph, execution)
    if err != nil {
        execution.Status = ExecutionStatusFailed
        execution.Error = err.Error()
    } else {
        execution.Status = ExecutionStatusSucceeded
    }

    execution.EndTime = time.Now()
    execution.Duration = execution.EndTime.Sub(execution.StartTime)

    return execution, err
}

// AI-powered code assistant for productivity enhancement
type AICodeAssistant struct {
    // AI models for different tasks
    codeGenModel      AIModel
    reviewModel       AIModel
    refactorModel     AIModel
    testGenModel      AIModel

    // Context and knowledge
    codebaseIndex     *CodebaseIndex
    patternLibrary    *PatternLibrary
    knowledgeBase     *KnowledgeBase

    // Performance optimization
    cacheManager      *CacheManager
    batchProcessor    *BatchProcessor

    config            *AIAssistantConfig
}

type AIAssistantConfig struct {
    // Model settings
    CodeGenModelEndpoint    string
    ReviewModelEndpoint     string
    RefactorModelEndpoint   string
    TestGenModelEndpoint    string

    // Performance settings
    MaxTokens              int
    Temperature            float64
    BatchSize              int
    CacheTimeout           time.Duration

    // Quality settings
    MinConfidenceScore     float64
    MaxSuggestions         int
    EnableContextAnalysis  bool
}

func (aia *AICodeAssistant) GenerateCode(ctx context.Context, prompt *CodePrompt) (*AICodeSuggestion, error) {
    // Build enhanced context
    context, err := aia.buildEnhancedContext(prompt)
    if err != nil {
        return nil, fmt.Errorf("failed to build context: %w", err)
    }

    // Generate code using AI model
    response, err := aia.codeGenModel.Generate(ctx, &ModelRequest{
        Prompt:      aia.buildPrompt(prompt, context),
        MaxTokens:   aia.config.MaxTokens,
        Temperature: aia.config.Temperature,
    })
    if err != nil {
        return nil, fmt.Errorf("AI code generation failed: %w", err)
    }

    // Validate and score suggestion
    suggestion := &AICodeSuggestion{
        Code:           response.Code,
        Explanation:    response.Explanation,
        Confidence:     response.Confidence,
        Alternatives:   response.Alternatives,
        EstimatedTime:  response.EstimatedTime,
        Complexity:     response.Complexity,
        GeneratedAt:    time.Now(),
    }

    // Post-process suggestion
    if err := aia.postProcessSuggestion(suggestion); err != nil {
        return nil, fmt.Errorf("post-processing failed: %w", err)
    }

    return suggestion, nil
}

func (aia *AICodeAssistant) ReviewCode(ctx context.Context, code *CodeReview) (*AIReviewSuggestion, error) {
    // Analyze code quality
    quality, err := aia.analyzeCodeQuality(code)
    if err != nil {
        return nil, fmt.Errorf("code quality analysis failed: %w", err)
    }

    // Get AI review
    response, err := aia.reviewModel.Review(ctx, &ReviewRequest{
        Code:            code.Content,
        Context:         code.Context,
        QualityMetrics:  quality,
        ReviewGuidelines: aia.getReviewGuidelines(),
    })
    if err != nil {
        return nil, fmt.Errorf("AI code review failed: %w", err)
    }

    suggestion := &AIReviewSuggestion{
        OverallScore:    response.Score,
        Issues:         response.Issues,
        Suggestions:    response.Suggestions,
        Improvements:   response.Improvements,
        Praise:         response.Praise,
        Confidence:     response.Confidence,
        ReviewedAt:     time.Now(),
    }

    return suggestion, nil
}

// Hot reload system for rapid development iteration
type HotReloadSystem struct {
    fileWatcher     *FileWatcher
    buildTrigger    *BuildTrigger
    processManager  *ProcessManager

    // Reload strategies
    strategies      map[string]ReloadStrategy

    // Performance optimization
    debouncer       *Debouncer
    incrementalBuild *IncrementalBuilder

    config          *HotReloadConfig
}

type HotReloadConfig struct {
    WatchPaths        []string
    IgnorePatterns    []string
    DebounceDelay     time.Duration
    BuildCommand      string
    RunCommand        string
    EnableIncremental bool
    EnableLiveReload  bool
}

func (hrs *HotReloadSystem) Start(ctx context.Context) error {
    // Start file watcher
    if err := hrs.fileWatcher.Start(ctx, hrs.config.WatchPaths); err != nil {
        return fmt.Errorf("failed to start file watcher: %w", err)
    }

    // Handle file changes
    go hrs.handleFileChanges(ctx)

    return nil
}

func (hrs *HotReloadSystem) handleFileChanges(ctx context.Context) {
    for {
        select {
        case <-ctx.Done():
            return
        case event := <-hrs.fileWatcher.Events():
            hrs.debouncer.Trigger(func() {
                hrs.performReload(ctx, event)
            })
        }
    }
}

func (hrs *HotReloadSystem) performReload(ctx context.Context, event FileEvent) {
    start := time.Now()

    // Determine reload strategy
    strategy := hrs.getReloadStrategy(event.Path)

    // Execute reload
    err := strategy.Reload(ctx, event)
    if err != nil {
        log.Printf("Reload failed: %v", err)
        return
    }

    log.Printf("Hot reload completed in %v", time.Since(start))
}

// Development metrics and velocity measurement
type VelocityMetrics struct {
    // Build metrics
    buildTimes        []time.Duration
    buildSuccessRate  float64

    // Test metrics
    testTimes         []time.Duration
    testSuccessRate   float64
    testCoverage      float64

    // Deployment metrics
    deploymentTimes   []time.Duration
    deploymentRate    float64

    // Developer metrics
    commitFrequency   float64
    codeChurnRate     float64
    featureVelocity   float64

    // Quality metrics
    bugRate           float64
    codeQualityScore  float64

    collector         *MetricsCollector
}

func (vm *VelocityMetrics) CalculateVelocityScore() *VelocityScore {
    score := &VelocityScore{
        CalculatedAt: time.Now(),
    }

    // Build velocity (30% weight)
    avgBuildTime := vm.calculateAverageDuration(vm.buildTimes)
    buildScore := vm.calculateTimeScore(avgBuildTime, 2*time.Minute) // Target: 2 minutes
    score.BuildVelocity = buildScore * vm.buildSuccessRate
    score.OverallScore += score.BuildVelocity * 0.3

    // Test velocity (25% weight)
    avgTestTime := vm.calculateAverageDuration(vm.testTimes)
    testScore := vm.calculateTimeScore(avgTestTime, 5*time.Minute) // Target: 5 minutes
    score.TestVelocity = testScore * vm.testSuccessRate * vm.testCoverage
    score.OverallScore += score.TestVelocity * 0.25

    // Deployment velocity (20% weight)
    avgDeployTime := vm.calculateAverageDuration(vm.deploymentTimes)
    deployScore := vm.calculateTimeScore(avgDeployTime, 10*time.Minute) // Target: 10 minutes
    score.DeploymentVelocity = deployScore * vm.deploymentRate
    score.OverallScore += score.DeploymentVelocity * 0.2

    // Developer velocity (15% weight)
    devScore := vm.commitFrequency * (1.0 - vm.codeChurnRate) * vm.featureVelocity
    score.DeveloperVelocity = min(devScore, 1.0)
    score.OverallScore += score.DeveloperVelocity * 0.15

    // Quality factor (10% weight)
    qualityScore := vm.codeQualityScore * (1.0 - vm.bugRate)
    score.QualityScore = qualityScore
    score.OverallScore += score.QualityScore * 0.1

    return score
}

type VelocityScore struct {
    OverallScore        float64   `json:"overallScore"`
    BuildVelocity       float64   `json:"buildVelocity"`
    TestVelocity        float64   `json:"testVelocity"`
    DeploymentVelocity  float64   `json:"deploymentVelocity"`
    DeveloperVelocity   float64   `json:"developerVelocity"`
    QualityScore        float64   `json:"qualityScore"`
    CalculatedAt        time.Time `json:"calculatedAt"`

    // Recommendations for improvement
    Recommendations     []Recommendation `json:"recommendations"`
}

type Recommendation struct {
    Category    string  `json:"category"`
    Priority    string  `json:"priority"`
    Description string  `json:"description"`
    Impact      float64 `json:"impact"`
    Effort      float64 `json:"effort"`
}

func (vm *VelocityMetrics) GenerateRecommendations(score *VelocityScore) []Recommendation {
    var recommendations []Recommendation

    // Build velocity improvements
    if score.BuildVelocity < 0.7 {
        recommendations = append(recommendations, Recommendation{
            Category:    "Build",
            Priority:    "High",
            Description: "Optimize build times through caching and parallelization",
            Impact:      0.8,
            Effort:      0.6,
        })
    }

    // Test velocity improvements
    if score.TestVelocity < 0.6 {
        recommendations = append(recommendations, Recommendation{
            Category:    "Testing",
            Priority:    "Medium",
            Description: "Implement parallel testing and selective test execution",
            Impact:      0.7,
            Effort:      0.5,
        })
    }

    // Deployment velocity improvements
    if score.DeploymentVelocity < 0.8 {
        recommendations = append(recommendations, Recommendation{
            Category:    "Deployment",
            Priority:    "High",
            Description: "Implement continuous deployment with feature flags",
            Impact:      0.9,
            Effort:      0.8,
        })
    }

    return recommendations
}

// Example usage: Complete development workflow
func ExampleCompleteWorkflow() {
    config := &VelocityConfig{
        EnableCodeGeneration:   true,
        EnableAutoTesting:      true,
        EnableAutoDeployment:   true,
        EnableContinuousProfile: true,
        MaxBuildTime:          5 * time.Minute,
        MaxTestTime:           10 * time.Minute,
        MaxDeployTime:         15 * time.Minute,
        MinTestCoverage:       80.0,
        MaxComplexityScore:    10,
        RequiredLinters:       []string{"golangci-lint", "gosec", "staticcheck"},
        EnableHotReload:       true,
        EnableIncrementalBuild: true,
        EnableParallelTasks:   true,
    }

    framework := NewDevelopmentVelocityFramework(config)

    // Generate new service
    spec := &GenerationSpec{
        Type:    "microservice",
        Name:    "user-service",
        Package: "github.com/company/user-service",
        Features: []string{
            "crud-operations",
            "authentication",
            "caching",
            "metrics",
            "tracing",
        },
        GenerateTests: true,
        GenerateDocs:  true,
    }

    generated, err := framework.codeGenerator.Generate(context.Background(), spec)
    if err != nil {
        log.Fatalf("Code generation failed: %v", err)
    }

    log.Printf("Generated %d files in %v", len(generated.Files), generated.GenerationTime)

    // Start development workflow
    workflow := framework.workflowEngine.CreateDevelopmentWorkflow()
    execution, err := framework.workflowEngine.ExecuteWorkflow(context.Background(), workflow.ID, nil)
    if err != nil {
        log.Fatalf("Workflow execution failed: %v", err)
    }

    log.Printf("Workflow completed in %v with status: %s", execution.Duration, execution.Status)

    // Measure velocity
    velocityScore := framework.metricsCollector.CalculateVelocityScore()
    log.Printf("Overall velocity score: %.2f", velocityScore.OverallScore)

    for _, rec := range velocityScore.Recommendations {
        log.Printf("Recommendation [%s]: %s (Impact: %.1f, Effort: %.1f)",
            rec.Priority, rec.Description, rec.Impact, rec.Effort)
    }
}

package ai

import (
    "context"
    "fmt"
    "strings"
    "time"
)

// AIAugmentedDevelopment provides comprehensive AI assistance
// for Go development, including code generation, review, refactoring,
// and optimization suggestions
type AIAugmentedDevelopment struct {
    // AI services
    codeGenerator    *AICodeGenerator
    codeReviewer     *AICodeReviewer
    refactorAgent    *AIRefactorAgent
    testGenerator    *AITestGenerator
    documentGenerator *AIDocumentGenerator

    // Learning and adaptation
    learningEngine   *LearningEngine
    patternDatabase  *PatternDatabase
    feedbackSystem   *FeedbackSystem

    // Quality assurance
    qualityChecker   *QualityChecker
    securityAnalyzer *SecurityAnalyzer

    config           *AIConfig
}

type AIConfig struct {
    // Model configuration
    Models              map[string]ModelConfig
    DefaultModel        string
    FallbackModel       string

    // Quality thresholds
    MinConfidenceScore  float64
    MaxSuggestions      int
    EnableLearning      bool

    // Performance settings
    RequestTimeout      time.Duration
    CacheResults        bool
    BatchProcessing     bool

    // Safety settings
    EnableSafetyChecks  bool
    MaxCodeLength       int
    AllowedPackages     []string
}

// AICodeGenerator provides intelligent code generation capabilities
type AICodeGenerator struct {
    models           map[string]AIModel
    promptTemplates  map[string]*PromptTemplate
    contextBuilder   *ContextBuilder

    // Code analysis
    codeAnalyzer     *CodeAnalyzer
    patternMatcher   *PatternMatcher

    // Quality validation
    syntaxValidator  *SyntaxValidator
    semanticValidator *SemanticValidator

    config           *CodeGenConfig
}

type CodeGenConfig struct {
    // Generation settings
    MaxIterations      int
    IterativeImprovement bool
    ContextWindowSize  int

    // Quality settings
    ValidateGenerated  bool
    FormatCode         bool
    AddComments        bool

    // Learning settings
    LearnFromFeedback  bool
    AdaptToStyle       bool
}

func (acg *AICodeGenerator) GenerateFunction(ctx context.Context, req *FunctionGenerationRequest) (*GeneratedFunction, error) {
    // Build context from existing codebase
    codeContext, err := acg.contextBuilder.BuildContext(req.Package, req.Dependencies)
    if err != nil {
        return nil, fmt.Errorf("failed to build context: %w", err)
    }

    // Create enhanced prompt
    prompt, err := acg.buildFunctionPrompt(req, codeContext)
    if err != nil {
        return nil, fmt.Errorf("failed to build prompt: %w", err)
    }

    // Generate initial code
    response, err := acg.generateWithModel(ctx, prompt, req.PreferredModel)
    if err != nil {
        return nil, fmt.Errorf("code generation failed: %w", err)
    }

    // Iterative improvement if enabled
    if acg.config.IterativeImprovement {
        improved, err := acg.iterativelyImprove(ctx, response, req, codeContext)
        if err != nil {
            // Log warning but use original response
            log.Printf("Iterative improvement failed: %v", err)
        } else {
            response = improved
        }
    }

    // Validate generated code
    if acg.config.ValidateGenerated {
        if err := acg.validateGenerated(response); err != nil {
            return nil, fmt.Errorf("generated code validation failed: %w", err)
        }
    }

    // Format code
    if acg.config.FormatCode {
        formatted, err := acg.formatCode(response.Code)
        if err != nil {
            return nil, fmt.Errorf("code formatting failed: %w", err)
        }
        response.Code = formatted
    }

    return &GeneratedFunction{
        Code:           response.Code,
        Documentation:  response.Documentation,
        Tests:          response.Tests,
        Confidence:     response.Confidence,
        Alternatives:   response.Alternatives,
        GeneratedAt:    time.Now(),
        Model:          response.Model,
        Metadata:       response.Metadata,
    }, nil
}

type FunctionGenerationRequest struct {
    // Function specification
    Name           string                 `json:"name"`
    Description    string                 `json:"description"`
    Parameters     []Parameter            `json:"parameters"`
    ReturnTypes    []Type                 `json:"returnTypes"`
    Package        string                 `json:"package"`

    // Context
    Dependencies   []string               `json:"dependencies"`
    ExistingCode   string                 `json:"existingCode,omitempty"`
    StyleGuide     *StyleGuide            `json:"styleGuide,omitempty"`

    // Requirements
    Requirements   []Requirement          `json:"requirements"`
    Constraints    []Constraint           `json:"constraints"`
    Examples       []Example              `json:"examples,omitempty"`

    // Generation preferences
    PreferredModel string                 `json:"preferredModel,omitempty"`
    GenerateTests  bool                   `json:"generateTests"`
    GenerateDocs   bool                   `json:"generateDocs"`
    OptimizeFor    OptimizationTarget     `json:"optimizeFor"`
}

type OptimizationTarget int

const (
    OptimizeForReadability OptimizationTarget = iota
    OptimizeForPerformance
    OptimizeForMaintainability
    OptimizeForTestability
    OptimizeForSecurity
)

func (acg *AICodeGenerator) buildFunctionPrompt(req *FunctionGenerationRequest, context *CodeContext) (*Prompt, error) {
    template := acg.promptTemplates["function_generation"]

    data := struct {
        Request    *FunctionGenerationRequest
        Context    *CodeContext
        StyleGuide *StyleGuide
        Examples   []CodeExample
    }{
        Request:    req,
        Context:    context,
        StyleGuide: acg.getStyleGuide(req.Package),
        Examples:   acg.getRelevantExamples(req),
    }

    promptText, err := template.Execute(data)
    if err != nil {
        return nil, fmt.Errorf("template execution failed: %w", err)
    }

    return &Prompt{
        Text:           promptText,
        Context:        context,
        MaxTokens:      acg.config.MaxTokens,
        Temperature:    acg.config.Temperature,
        SystemMessage:  acg.getSystemMessage("function_generation"),
    }, nil
}

// AICodeReviewer provides intelligent code review capabilities
type AICodeReviewer struct {
    models           map[string]AIModel
    reviewTemplates  map[string]*ReviewTemplate
    qualityMetrics   *QualityMetrics

    // Analysis engines
    complexityAnalyzer *ComplexityAnalyzer
    securityAnalyzer   *SecurityAnalyzer
    performanceAnalyzer *PerformanceAnalyzer

    // Knowledge base
    bestPractices    *BestPracticesDB
    antiPatterns     *AntiPatternsDB

    config           *ReviewConfig
}

type ReviewConfig struct {
    // Review scope
    ReviewDepth        ReviewDepth
    FocusAreas         []ReviewFocus
    LanguageSpecific   bool

    // Quality thresholds
    MinQualityScore    float64
    MaxComplexity      int
    MaxFileSize        int

    // Review style
    ReviewTone         ReviewTone
    IncludePraise      bool
    SuggestAlternatives bool
}

type ReviewDepth int

const (
    ReviewDepthSurface ReviewDepth = iota
    ReviewDepthStandard
    ReviewDepthDeep
    ReviewDepthComprehensive
)

type ReviewFocus int

const (
    ReviewFocusCorrectness ReviewFocus = iota
    ReviewFocusPerformance
    ReviewFocusSecurity
    ReviewFocusMaintainability
    ReviewFocusReadability
    ReviewFocusTestability
)

type ReviewTone int

const (
    ReviewToneProfessional ReviewTone = iota
    ReviewToneFriendly
    ReviewToneMentoring
    ReviewToneDirect
)

func (acr *AICodeReviewer) ReviewCode(ctx context.Context, req *CodeReviewRequest) (*CodeReviewResult, error) {
    // Analyze code quality metrics
    qualityMetrics, err := acr.qualityMetrics.Analyze(req.Code)
    if err != nil {
        return nil, fmt.Errorf("quality analysis failed: %w", err)
    }

    // Perform specialized analysis
    complexityResult := acr.complexityAnalyzer.Analyze(req.Code)
    securityResult := acr.securityAnalyzer.Analyze(req.Code)
    performanceResult := acr.performanceAnalyzer.Analyze(req.Code)

    // Build review context
    reviewContext := &ReviewContext{
        Code:            req.Code,
        Metadata:        req.Metadata,
        QualityMetrics:  qualityMetrics,
        Complexity:      complexityResult,
        SecurityIssues:  securityResult.Issues,
        PerformanceIssues: performanceResult.Issues,
        BestPractices:   acr.bestPractices.GetRelevant(req.Language),
        AntiPatterns:    acr.antiPatterns.GetRelevant(req.Language),
    }

    // Generate AI review
    aiReview, err := acr.generateAIReview(ctx, reviewContext)
    if err != nil {
        return nil, fmt.Errorf("AI review generation failed: %w", err)
    }

    // Combine with automated analysis
    result := &CodeReviewResult{
        OverallScore:     acr.calculateOverallScore(qualityMetrics, aiReview),
        AIReview:         aiReview,
        QualityMetrics:   qualityMetrics,
        ComplexityAnalysis: complexityResult,
        SecurityAnalysis: securityResult,
        PerformanceAnalysis: performanceResult,
        Recommendations:  acr.generateRecommendations(reviewContext, aiReview),
        ReviewedAt:       time.Now(),
    }

    return result, nil
}

type CodeReviewRequest struct {
    Code        string                 `json:"code"`
    Language    string                 `json:"language"`
    Metadata    map[string]interface{} `json:"metadata"`
    Context     *ProjectContext        `json:"context,omitempty"`
    FocusAreas  []ReviewFocus          `json:"focusAreas,omitempty"`
    Reviewer    string                 `json:"reviewer,omitempty"`
}

type CodeReviewResult struct {
    OverallScore        float64              `json:"overallScore"`
    AIReview            *AIReview            `json:"aiReview"`
    QualityMetrics      *QualityMetrics      `json:"qualityMetrics"`
    ComplexityAnalysis  *ComplexityResult    `json:"complexityAnalysis"`
    SecurityAnalysis    *SecurityResult      `json:"securityAnalysis"`
    PerformanceAnalysis *PerformanceResult   `json:"performanceAnalysis"`
    Recommendations     []Recommendation     `json:"recommendations"`
    ReviewedAt          time.Time            `json:"reviewedAt"`
}

type AIReview struct {
    Summary         string           `json:"summary"`
    Comments        []ReviewComment  `json:"comments"`
    Suggestions     []CodeSuggestion `json:"suggestions"`
    Praise          []string         `json:"praise,omitempty"`
    Concerns        []string         `json:"concerns,omitempty"`
    OverallFeedback string           `json:"overallFeedback"`
    Confidence      float64          `json:"confidence"`
}

type ReviewComment struct {
    Line        int              `json:"line"`
    Column      int              `json:"column,omitempty"`
    Type        CommentType      `json:"type"`
    Severity    CommentSeverity  `json:"severity"`
    Message     string           `json:"message"`
    Suggestion  string           `json:"suggestion,omitempty"`
    Reference   string           `json:"reference,omitempty"`
}

type CommentType int

const (
    CommentTypeBug CommentType = iota
    CommentTypeImprovement
    CommentTypeStyle
    CommentTypeSecurity
    CommentTypePerformance
    CommentTypeQuestion
    CommentTypePraise
)

type CommentSeverity int

const (
    CommentSeverityInfo CommentSeverity = iota
    CommentSeverityMinor
    CommentSeverityMajor
    CommentSeverityCritical
)

// AI-powered refactoring agent
type AIRefactorAgent struct {
    models             map[string]AIModel
    refactorTemplates  map[string]*RefactorTemplate

    // Analysis capabilities
    codeAnalyzer       *CodeAnalyzer
    dependencyAnalyzer *DependencyAnalyzer
    impactAnalyzer     *ImpactAnalyzer

    // Refactoring strategies
    strategies         map[string]RefactorStrategy

    config             *RefactorConfig
}

type RefactorConfig struct {
    // Safety settings
    SafetyLevel        SafetyLevel
    RequireTests       bool
    PreserveBehavior   bool

    // Refactoring scope
    MaxScopeFiles      int
    MaxImpactScore     float64

    // Quality requirements
    MinQualityImprovement float64
    MaxComplexityIncrease int
}

type SafetyLevel int

const (
    SafetyLevelConservative SafetyLevel = iota
    SafetyLevelModerate
    SafetyLevelAggressive
)

func (ara *AIRefactorAgent) SuggestRefactoring(ctx context.Context, req *RefactorRequest) (*RefactorSuggestion, error) {
    // Analyze current code quality
    currentQuality, err := ara.codeAnalyzer.AnalyzeQuality(req.Code)
    if err != nil {
        return nil, fmt.Errorf("code quality analysis failed: %w", err)
    }

    // Identify refactoring opportunities
    opportunities, err := ara.identifyOpportunities(req.Code, currentQuality)
    if err != nil {
        return nil, fmt.Errorf("opportunity identification failed: %w", err)
    }

    // Analyze impact
    impact, err := ara.impactAnalyzer.AnalyzeImpact(req.Code, opportunities)
    if err != nil {
        return nil, fmt.Errorf("impact analysis failed: %w", err)
    }

    // Generate refactoring suggestions
    suggestions := make([]RefactorOption, 0, len(opportunities))
    for _, opportunity := range opportunities {
        if impact.Scores[opportunity.ID] > ara.config.MaxImpactScore {
            continue // Skip high-impact refactoring
        }

        suggestion, err := ara.generateRefactoringSuggestion(ctx, opportunity, req.Code)
        if err != nil {
            log.Printf("Failed to generate suggestion for %s: %v", opportunity.Type, err)
            continue
        }

        suggestions = append(suggestions, *suggestion)
    }

    // Rank suggestions by benefit/risk ratio
    rankedSuggestions := ara.rankSuggestions(suggestions, currentQuality, impact)

    result := &RefactorSuggestion{
        CurrentQuality:  currentQuality,
        Opportunities:   opportunities,
        Suggestions:     rankedSuggestions,
        Impact:          impact,
        Recommendations: ara.generateRefactorRecommendations(rankedSuggestions),
        AnalyzedAt:      time.Now(),
    }

    return result, nil
}

type RefactorRequest struct {
    Code         string                 `json:"code"`
    FilePath     string                 `json:"filePath"`
    Language     string                 `json:"language"`
    Context      *ProjectContext        `json:"context"`
    Goals        []RefactorGoal         `json:"goals"`
    Constraints  []RefactorConstraint   `json:"constraints"`
}

type RefactorGoal int

const (
    RefactorGoalReadability RefactorGoal = iota
    RefactorGoalPerformance
    RefactorGoalMaintainability
    RefactorGoalTestability
    RefactorGoalComplexity
)

type RefactorConstraint struct {
    Type        ConstraintType `json:"type"`
    Description string         `json:"description"`
    Severity    string         `json:"severity"`
}

type ConstraintType int

const (
    ConstraintTypePreserveBehavior ConstraintType = iota
    ConstraintTypeMinimalChanges
    ConstraintTypeBackwardCompatibility
    ConstraintTypePerformanceImpact
)

type RefactorSuggestion struct {
    CurrentQuality  *QualityMetrics    `json:"currentQuality"`
    Opportunities   []RefactorOpportunity `json:"opportunities"`
    Suggestions     []RefactorOption   `json:"suggestions"`
    Impact          *ImpactAnalysis    `json:"impact"`
    Recommendations []string           `json:"recommendations"`
    AnalyzedAt      time.Time          `json:"analyzedAt"`
}

type RefactorOpportunity struct {
    ID          string         `json:"id"`
    Type        RefactorType   `json:"type"`
    Description string         `json:"description"`
    Location    Location       `json:"location"`
    Severity    string         `json:"severity"`
    Benefit     float64        `json:"benefit"`
    Effort      float64        `json:"effort"`
}

type RefactorType int

const (
    RefactorTypeExtractMethod RefactorType = iota
    RefactorTypeExtractClass
    RefactorTypeRenameVariable
    RefactorTypeSimplifyCondition
    RefactorTypeReduceComplexity
    RefactorTypeImproveNaming
    RefactorTypeEliminateDuplication
)

type RefactorOption struct {
    ID              string         `json:"id"`
    Type            RefactorType   `json:"type"`
    Description     string         `json:"description"`
    OriginalCode    string         `json:"originalCode"`
    RefactoredCode  string         `json:"refactoredCode"`
    Explanation     string         `json:"explanation"`
    Benefits        []string       `json:"benefits"`
    Risks           []string       `json:"risks"`
    Confidence      float64        `json:"confidence"`
    QualityImpact   *QualityDelta  `json:"qualityImpact"`
}

type QualityDelta struct {
    ComplexityChange    int     `json:"complexityChange"`
    ReadabilityChange   float64 `json:"readabilityChange"`
    MaintainabilityChange float64 `json:"maintainabilityChange"`
    TestabilityChange   float64 `json:"testabilityChange"`
}

// Example: Complete AI-augmented development workflow
func ExampleAIAugmentedWorkflow() {
    config := &AIConfig{
        Models: map[string]ModelConfig{
            "code_gen": {
                Endpoint:    "https://api.openai.com/v1/chat/completions",
                Model:       "gpt-4",
                MaxTokens:   2048,
                Temperature: 0.2,
            },
            "code_review": {
                Endpoint:    "https://api.anthropic.com/v1/messages",
                Model:       "claude-3-sonnet",
                MaxTokens:   4096,
                Temperature: 0.1,
            },
        },
        DefaultModel:       "code_gen",
        FallbackModel:      "code_review",
        MinConfidenceScore: 0.7,
        MaxSuggestions:     5,
        EnableLearning:     true,
        RequestTimeout:     30 * time.Second,
        CacheResults:       true,
        BatchProcessing:    true,
        EnableSafetyChecks: true,
        MaxCodeLength:      10000,
    }

    aiDev := NewAIAugmentedDevelopment(config)

    // Generate a new function
    funcReq := &FunctionGenerationRequest{
        Name:        "ProcessUserData",
        Description: "Process user data with validation and transformation",
        Parameters: []Parameter{
            {Name: "userData", Type: "map[string]interface{}", Description: "Raw user data"},
            {Name: "schema", Type: "*ValidationSchema", Description: "Validation schema"},
        },
        ReturnTypes: []Type{
            {Name: "*ProcessedUserData", Description: "Processed and validated data"},
            {Name: "error", Description: "Processing error if any"},
        },
        Package:       "github.com/company/user-service",
        Dependencies:  []string{"encoding/json", "github.com/go-playground/validator/v10"},
        GenerateTests: true,
        GenerateDocs:  true,
        OptimizeFor:   OptimizeForMaintainability,
    }

    generated, err := aiDev.codeGenerator.GenerateFunction(context.Background(), funcReq)
    if err != nil {
        log.Fatalf("Function generation failed: %v", err)
    }

    log.Printf("Generated function with confidence: %.2f", generated.Confidence)
    log.Printf("Generated code:\n%s", generated.Code)

    // Review the generated code
    reviewReq := &CodeReviewRequest{
        Code:       generated.Code,
        Language:   "go",
        FocusAreas: []ReviewFocus{ReviewFocusCorrectness, ReviewFocusPerformance, ReviewFocusSecurity},
    }

    review, err := aiDev.codeReviewer.ReviewCode(context.Background(), reviewReq)
    if err != nil {
        log.Fatalf("Code review failed: %v", err)
    }

    log.Printf("Review score: %.2f", review.OverallScore)
    for _, comment := range review.AIReview.Comments {
        log.Printf("Line %d: %s", comment.Line, comment.Message)
    }

    // Suggest refactoring if needed
    if review.OverallScore < 0.8 {
        refactorReq := &RefactorRequest{
            Code:     generated.Code,
            Language: "go",
            Goals:    []RefactorGoal{RefactorGoalReadability, RefactorGoalMaintainability},
        }

        refactorSuggestion, err := aiDev.refactorAgent.SuggestRefactoring(context.Background(), refactorReq)
        if err != nil {
            log.Fatalf("Refactoring suggestion failed: %v", err)
        }

        for _, suggestion := range refactorSuggestion.Suggestions {
            log.Printf("Refactoring suggestion: %s (Confidence: %.2f)", suggestion.Description, suggestion.Confidence)
        }
    }
}

package optimization

import (
    "context"
    "fmt"
    "path/filepath"
    "sync"
    "time"
)

// BuildOptimizationEngine provides comprehensive build optimization
// for enterprise Go applications including incremental builds,
// caching strategies, and parallel processing
type BuildOptimizationEngine struct {
    // Build caching
    buildCache        *BuildCache
    dependencyCache   *DependencyCache
    artifactCache     *ArtifactCache

    // Parallel processing
    buildOrchestrator *BuildOrchestrator
    workerPool        *WorkerPool

    // Optimization strategies
    incrementalBuilder *IncrementalBuilder
    linkTimeOptimizer  *LinkTimeOptimizer
    compressionEngine  *CompressionEngine

    // Monitoring
    buildMetrics      *BuildMetrics
    performanceProfiler *PerformanceProfiler

    config            *BuildConfig
}

type BuildConfig struct {
    // Caching settings
    EnableBuildCache     bool
    CacheDirectory       string
    CacheTTL            time.Duration
    MaxCacheSize        int64

    // Parallel processing
    MaxParallelJobs     int
    EnableParallelLinks bool
    WorkerPoolSize      int

    // Optimization flags
    EnableLTO           bool  // Link Time Optimization
    EnableCompression   bool
    StripSymbols        bool
    OptimizationLevel   int

    // Target configuration
    BuildTargets        []BuildTarget
    CrossCompilation    bool
    StaticLinking       bool
}

type BuildTarget struct {
    GOOS     string
    GOARCH   string
    CGO      bool
    Tags     []string
    LDFlags  []string
    GCFlags  []string
}

func NewBuildOptimizationEngine(config *BuildConfig) *BuildOptimizationEngine {
    return &BuildOptimizationEngine{
        buildCache:        NewBuildCache(config.CacheConfig),
        dependencyCache:   NewDependencyCache(config.DepCacheConfig),
        artifactCache:     NewArtifactCache(config.ArtifactCacheConfig),
        buildOrchestrator: NewBuildOrchestrator(config.OrchestratorConfig),
        workerPool:        NewWorkerPool(config.WorkerPoolConfig),
        incrementalBuilder: NewIncrementalBuilder(config.IncrementalConfig),
        linkTimeOptimizer: NewLinkTimeOptimizer(config.LTOConfig),
        compressionEngine: NewCompressionEngine(config.CompressionConfig),
        buildMetrics:      NewBuildMetrics(),
        performanceProfiler: NewPerformanceProfiler(),
        config:            config,
    }
}

func (boe *BuildOptimizationEngine) OptimizedBuild(ctx context.Context, project *Project) (*BuildResult, error) {
    start := time.Now()
    defer func() {
        boe.buildMetrics.RecordBuildTime(time.Since(start))
    }()

    // Analyze project for optimization opportunities
    analysis, err := boe.analyzeProject(project)
    if err != nil {
        return nil, fmt.Errorf("project analysis failed: %w", err)
    }

    // Check build cache
    if boe.config.EnableBuildCache {
        if cached := boe.buildCache.Get(analysis.Hash); cached != nil {
            boe.buildMetrics.RecordCacheHit()
            return cached.(*BuildResult), nil
        }
    }

    // Determine build strategy
    strategy := boe.selectBuildStrategy(analysis)

    // Execute optimized build
    result, err := boe.executeBuild(ctx, project, strategy)
    if err != nil {
        boe.buildMetrics.RecordBuildFailure()
        return nil, fmt.Errorf("build execution failed: %w", err)
    }

    // Cache successful build
    if boe.config.EnableBuildCache && result.Success {
        boe.buildCache.Set(analysis.Hash, result)
    }

    boe.buildMetrics.RecordBuildSuccess()
    return result, nil
}

// IncrementalBuilder provides intelligent incremental building
type IncrementalBuilder struct {
    dependencyGraph   *DependencyGraph
    changeDetector    *ChangeDetector
    buildPlan         *BuildPlan

    // File monitoring
    fileWatcher       *FileWatcher
    checksumCache     *ChecksumCache

    // Build state
    lastBuildState    *BuildState
    buildStateCache   *BuildStateCache

    config            *IncrementalConfig
}

type IncrementalConfig struct {
    // Change detection
    ChecksumAlgorithm    string
    IgnorePatterns       []string
    MonitorPaths         []string

    // Build planning
    MinimalRebuild       bool
    ParallelPackages     bool
    CascadeChanges       bool

    // State management
    StateFile            string
    PersistState         bool
    StateCompression     bool
}

func (ib *IncrementalBuilder) PlanIncrementalBuild(project *Project) (*BuildPlan, error) {
    // Detect changes since last build
    changes, err := ib.changeDetector.DetectChanges(project.Path, ib.lastBuildState)
    if err != nil {
        return nil, fmt.Errorf("change detection failed: %w", err)
    }

    if len(changes) == 0 {
        return &BuildPlan{
            RequiresRebuild: false,
            ChangedPackages: []string{},
            BuildOrder:      []string{},
        }, nil
    }

    // Analyze impact of changes
    impact, err := ib.analyzeChangeImpact(changes, ib.dependencyGraph)
    if err != nil {
        return nil, fmt.Errorf("impact analysis failed: %w", err)
    }

    // Create optimized build plan
    plan := &BuildPlan{
        RequiresRebuild: true,
        ChangedPackages: impact.AffectedPackages,
        BuildOrder:      ib.optimizeBuildOrder(impact.AffectedPackages),
        ParallelGroups:  ib.createParallelGroups(impact.AffectedPackages),
        EstimatedTime:   ib.estimateBuildTime(impact.AffectedPackages),
    }

    return plan, nil
}

func (ib *IncrementalBuilder) analyzeChangeImpact(changes []FileChange, depGraph *DependencyGraph) (*ChangeImpact, error) {
    impact := &ChangeImpact{
        DirectlyAffected:   make(map[string]bool),
        IndirectlyAffected: make(map[string]bool),
        AffectedPackages:   []string{},
    }

    // Find directly affected packages
    for _, change := range changes {
        pkg := ib.getPackageForFile(change.Path)
        if pkg != "" {
            impact.DirectlyAffected[pkg] = true
        }
    }

    // Find indirectly affected packages through dependency graph
    for pkg := range impact.DirectlyAffected {
        dependents := depGraph.GetDependents(pkg)
        for _, dependent := range dependents {
            impact.IndirectlyAffected[dependent] = true
        }
    }

    // Combine all affected packages
    for pkg := range impact.DirectlyAffected {
        impact.AffectedPackages = append(impact.AffectedPackages, pkg)
    }
    for pkg := range impact.IndirectlyAffected {
        if !impact.DirectlyAffected[pkg] {
            impact.AffectedPackages = append(impact.AffectedPackages, pkg)
        }
    }

    return impact, nil
}

// Parallel build orchestration
type BuildOrchestrator struct {
    dependencyGraph   *DependencyGraph
    workerPool        *WorkerPool
    buildQueue        *BuildQueue

    // Scheduling
    scheduler         *BuildScheduler
    prioritizer       *TaskPrioritizer

    // Monitoring
    progressTracker   *ProgressTracker
    resourceMonitor   *ResourceMonitor

    config            *OrchestratorConfig
}

func (bo *BuildOrchestrator) ExecuteParallelBuild(ctx context.Context, plan *BuildPlan) (*BuildResult, error) {
    // Create build tasks from plan
    tasks := bo.createBuildTasks(plan)

    // Schedule tasks based on dependencies
    schedule, err := bo.scheduler.Schedule(tasks, bo.dependencyGraph)
    if err != nil {
        return nil, fmt.Errorf("task scheduling failed: %w", err)
    }

    // Execute scheduled tasks
    results := make(chan *TaskResult, len(tasks))
    var wg sync.WaitGroup

    for _, batch := range schedule.ParallelBatches {
        wg.Add(len(batch))
        for _, task := range batch {
            go func(t *BuildTask) {
                defer wg.Done()
                result := bo.executeTask(ctx, t)
                results <- result
            }(task)
        }

        // Wait for current batch to complete before starting next
        wg.Wait()

        // Check for failures
        if bo.hasFailures(results, len(batch)) {
            return bo.handleBuildFailure(results)
        }
    }

    close(results)

    // Aggregate results
    return bo.aggregateResults(results), nil
}

func (bo *BuildOrchestrator) executeTask(ctx context.Context, task *BuildTask) *TaskResult {
    start := time.Now()

    result := &TaskResult{
        TaskID:    task.ID,
        StartTime: start,
        Status:    TaskStatusRunning,
    }

    // Execute build command
    err := bo.runBuildCommand(ctx, task)
    if err != nil {
        result.Status = TaskStatusFailed
        result.Error = err
    } else {
        result.Status = TaskStatusSucceeded
    }

    result.EndTime = time.Now()
    result.Duration = result.EndTime.Sub(result.StartTime)

    return result
}

// Advanced caching strategies
type BuildCache struct {
    storage       CacheStorage
    hasher        ContentHasher
    compressor    Compressor

    // Cache policies
    evictionPolicy EvictionPolicy
    retentionPolicy RetentionPolicy

    // Metrics
    hitRate       *HitRateTracker
    performance   *CachePerformanceTracker

    config        *CacheConfig
}

type CacheConfig struct {
    // Storage settings
    StorageType      StorageType
    StoragePath      string
    MaxSize          int64
    MaxEntries       int

    // Performance settings
    CompressionLevel int
    CompressionType  CompressionType
    HashAlgorithm    HashAlgorithm

    // Policies
    TTL              time.Duration
    EvictionStrategy EvictionStrategy
    Preemptive       bool
}

func (bc *BuildCache) Get(key string) interface{} {
    start := time.Now()
    defer func() {
        bc.performance.RecordLookupTime(time.Since(start))
    }()

    // Check if entry exists and is valid
    entry, exists := bc.storage.Get(key)
    if !exists {
        bc.hitRate.RecordMiss()
        return nil
    }

    // Check TTL
    if bc.isExpired(entry) {
        bc.storage.Delete(key)
        bc.hitRate.RecordMiss()
        return nil
    }

    bc.hitRate.RecordHit()
    return bc.deserializeEntry(entry)
}

func (bc *BuildCache) Set(key string, value interface{}) {
    start := time.Now()
    defer func() {
        bc.performance.RecordStoreTime(time.Since(start))
    }()

    // Serialize and compress if needed
    serialized := bc.serializeEntry(value)

    if bc.config.CompressionType != CompressionTypeNone {
        compressed, err := bc.compressor.Compress(serialized)
        if err == nil {
            serialized = compressed
        }
    }

    // Store with metadata
    entry := &CacheEntry{
        Key:       key,
        Data:      serialized,
        CreatedAt: time.Now(),
        TTL:       bc.config.TTL,
        Size:      int64(len(serialized)),
    }

    // Check if eviction is needed
    if bc.needsEviction(entry.Size) {
        bc.evictEntries(entry.Size)
    }

    bc.storage.Set(key, entry)
}

// Performance profiling and optimization
type PerformanceProfiler struct {
    cpuProfiler    *CPUProfiler
    memProfiler    *MemoryProfiler
    ioProfiler     *IOProfiler

    // Analysis
    bottleneckAnalyzer *BottleneckAnalyzer
    optimizationFinder *OptimizationFinder

    // Reporting
    reportGenerator *ReportGenerator

    config         *ProfilerConfig
}

func (pp *PerformanceProfiler) ProfileBuild(ctx context.Context, buildFunc func() error) (*PerformanceReport, error) {
    // Start profiling
    pp.cpuProfiler.Start()
    pp.memProfiler.Start()
    pp.ioProfiler.Start()

    start := time.Now()

    // Execute build
    err := buildFunc()

    duration := time.Since(start)

    // Stop profiling
    cpuProfile := pp.cpuProfiler.Stop()
    memProfile := pp.memProfiler.Stop()
    ioProfile := pp.ioProfiler.Stop()

    // Analyze profiles
    analysis := pp.analyzeProfiles(cpuProfile, memProfile, ioProfile)

    // Find optimization opportunities
    optimizations := pp.optimizationFinder.FindOptimizations(analysis)

    report := &PerformanceReport{
        Duration:       duration,
        CPUProfile:     cpuProfile,
        MemoryProfile:  memProfile,
        IOProfile:      ioProfile,
        Analysis:       analysis,
        Optimizations:  optimizations,
        ProfiledAt:     time.Now(),
    }

    return report, err
}

type PerformanceReport struct {
    Duration       time.Duration        `json:"duration"`
    CPUProfile     *CPUProfile          `json:"cpuProfile"`
    MemoryProfile  *MemoryProfile       `json:"memoryProfile"`
    IOProfile      *IOProfile           `json:"ioProfile"`
    Analysis       *PerformanceAnalysis `json:"analysis"`
    Optimizations  []Optimization       `json:"optimizations"`
    ProfiledAt     time.Time            `json:"profiledAt"`
}

type PerformanceAnalysis struct {
    Bottlenecks    []Bottleneck         `json:"bottlenecks"`
    ResourceUsage  *ResourceUsage       `json:"resourceUsage"`
    Inefficiencies []Inefficiency       `json:"inefficiencies"`
    Recommendations []string            `json:"recommendations"`
}

type Bottleneck struct {
    Type        BottleneckType       `json:"type"`
    Location    string               `json:"location"`
    Impact      float64              `json:"impact"`
    Description string               `json:"description"`
    Suggestion  string               `json:"suggestion"`
}

type BottleneckType int

const (
    BottleneckTypeCPU BottleneckType = iota
    BottleneckTypeMemory
    BottleneckTypeIO
    BottleneckTypeNetwork
    BottleneckTypeDependency
)

// Example: Complete optimized build workflow
func ExampleOptimizedBuildWorkflow() {
    config := &BuildConfig{
        EnableBuildCache:    true,
        CacheDirectory:     ".build-cache",
        CacheTTL:          24 * time.Hour,
        MaxCacheSize:      10 << 30, // 10GB
        MaxParallelJobs:   runtime.NumCPU(),
        EnableParallelLinks: true,
        WorkerPoolSize:    runtime.NumCPU() * 2,
        EnableLTO:         true,
        EnableCompression: true,
        StripSymbols:      true,
        OptimizationLevel: 2,
        BuildTargets: []BuildTarget{
            {GOOS: "linux", GOARCH: "amd64", CGO: false},
            {GOOS: "darwin", GOARCH: "amd64", CGO: false},
            {GOOS: "windows", GOARCH: "amd64", CGO: false},
        },
        CrossCompilation: true,
        StaticLinking:    true,
    }

    engine := NewBuildOptimizationEngine(config)

    project := &Project{
        Path:         "/path/to/project",
        Name:         "my-service",
        GoVersion:    "1.21",
        Dependencies: []string{"github.com/gin-gonic/gin", "gorm.io/gorm"},
    }

    // Profile the build
    var buildResult *BuildResult
    report, err := engine.performanceProfiler.ProfileBuild(context.Background(), func() error {
        result, err := engine.OptimizedBuild(context.Background(), project)
        buildResult = result
        return err
    })

    if err != nil {
        log.Fatalf("Build failed: %v", err)
    }

    log.Printf("Build completed in %v", report.Duration)
    log.Printf("Build cache hit rate: %.2f%%", engine.buildCache.hitRate.GetHitRate()*100)

    for _, bottleneck := range report.Analysis.Bottlenecks {
        log.Printf("Bottleneck: %s - %s", bottleneck.Location, bottleneck.Description)
    }

    for _, optimization := range report.Optimizations {
        log.Printf("Optimization opportunity: %s (Impact: %.1f)", optimization.Description, optimization.Impact)
    }

    log.Printf("Final build artifacts: %d files, %d MB total",
        len(buildResult.Artifacts), buildResult.TotalSize/(1024*1024))
}