package temporal

import (
	"context"
	"fmt"
	"time"

	"chorus.services/bzzz/pkg/slurp/storage"
)

// TemporalGraphFactory creates and configures temporal graph components
type TemporalGraphFactory struct {
	storage storage.ContextStore
	config  *TemporalConfig
}

// TemporalConfig represents configuration for the temporal graph system
type TemporalConfig struct {
	// Core graph settings
	MaxDepth                 int           `json:"max_depth"`
	StalenessWeights        *StalenessWeights `json:"staleness_weights"`
	CacheTimeout            time.Duration `json:"cache_timeout"`
	
	// Analysis settings
	InfluenceAnalysisConfig *InfluenceAnalysisConfig `json:"influence_analysis_config"`
	NavigationConfig        *NavigationConfig        `json:"navigation_config"`
	QueryConfig             *QueryConfig             `json:"query_config"`
	
	// Persistence settings
	PersistenceConfig       *PersistenceConfig       `json:"persistence_config"`
	
	// Performance settings
	EnableCaching           bool          `json:"enable_caching"`
	EnableCompression       bool          `json:"enable_compression"`
	EnableMetrics           bool          `json:"enable_metrics"`
	
	// Debug settings
	EnableDebugLogging      bool          `json:"enable_debug_logging"`
	EnableValidation        bool          `json:"enable_validation"`
}

// InfluenceAnalysisConfig represents configuration for influence analysis
type InfluenceAnalysisConfig struct {
	DampingFactor           float64       `json:"damping_factor"`
	MaxIterations           int           `json:"max_iterations"`
	ConvergenceThreshold    float64       `json:"convergence_threshold"`
	CacheValidDuration      time.Duration `json:"cache_valid_duration"`
	EnableCentralityMetrics bool          `json:"enable_centrality_metrics"`
	EnableCommunityDetection bool         `json:"enable_community_detection"`
}

// NavigationConfig represents configuration for decision navigation
type NavigationConfig struct {
	MaxNavigationHistory    int           `json:"max_navigation_history"`
	BookmarkRetention       time.Duration `json:"bookmark_retention"`
	SessionTimeout          time.Duration `json:"session_timeout"`
	EnablePathCaching       bool          `json:"enable_path_caching"`
}

// QueryConfig represents configuration for decision-hop queries
type QueryConfig struct {
	DefaultMaxHops          int           `json:"default_max_hops"`
	MaxQueryResults         int           `json:"max_query_results"`
	QueryTimeout            time.Duration `json:"query_timeout"`
	CacheQueryResults       bool          `json:"cache_query_results"`
	EnableQueryOptimization bool          `json:"enable_query_optimization"`
}

// TemporalGraphSystem represents the complete temporal graph system
type TemporalGraphSystem struct {
	Graph               TemporalGraph
	Navigator           DecisionNavigator
	InfluenceAnalyzer   InfluenceAnalyzer
	StalenessDetector   StalenessDetector
	ConflictDetector    ConflictDetector
	PatternAnalyzer     PatternAnalyzer
	VersionManager      VersionManager
	HistoryManager      HistoryManager
	MetricsCollector    MetricsCollector
	QuerySystem         *querySystemImpl
	PersistenceManager  *persistenceManagerImpl
}

// NewTemporalGraphFactory creates a new temporal graph factory
func NewTemporalGraphFactory(storage storage.ContextStore, config *TemporalConfig) *TemporalGraphFactory {
	if config == nil {
		config = DefaultTemporalConfig()
	}
	
	return &TemporalGraphFactory{
		storage: storage,
		config:  config,
	}
}

// CreateTemporalGraphSystem creates a complete temporal graph system
func (tgf *TemporalGraphFactory) CreateTemporalGraphSystem(
	localStorage storage.LocalStorage,
	distributedStorage storage.DistributedStorage,
	encryptedStorage storage.EncryptedStorage,
	backupManager storage.BackupManager,
) (*TemporalGraphSystem, error) {
	
	// Create core temporal graph
	graph := NewTemporalGraph(tgf.storage).(*temporalGraphImpl)
	
	// Create navigator
	navigator := NewDecisionNavigator(graph)
	
	// Create influence analyzer
	analyzer := NewInfluenceAnalyzer(graph)
	
	// Create staleness detector
	detector := NewStalenessDetector(graph)
	
	// Create query system
	querySystem := NewQuerySystem(graph, navigator, analyzer, detector)
	
	// Create persistence manager
	persistenceManager := NewPersistenceManager(
		tgf.storage,
		localStorage,
		distributedStorage,
		encryptedStorage,
		backupManager,
		graph,
		tgf.config.PersistenceConfig,
	)
	
	// Create additional components
	conflictDetector := NewConflictDetector(graph)
	patternAnalyzer := NewPatternAnalyzer(graph)
	versionManager := NewVersionManager(graph, persistenceManager)
	historyManager := NewHistoryManager(graph, persistenceManager)
	metricsCollector := NewMetricsCollector(graph)
	
	system := &TemporalGraphSystem{
		Graph:               graph,
		Navigator:           navigator,
		InfluenceAnalyzer:   analyzer,
		StalenessDetector:   detector,
		ConflictDetector:    conflictDetector,
		PatternAnalyzer:     patternAnalyzer,
		VersionManager:      versionManager,
		HistoryManager:      historyManager,
		MetricsCollector:    metricsCollector,
		QuerySystem:         querySystem,
		PersistenceManager:  persistenceManager,
	}
	
	return system, nil
}

// LoadExistingSystem loads an existing temporal graph system from storage
func (tgf *TemporalGraphFactory) LoadExistingSystem(
	ctx context.Context,
	localStorage storage.LocalStorage,
	distributedStorage storage.DistributedStorage,
	encryptedStorage storage.EncryptedStorage,
	backupManager storage.BackupManager,
) (*TemporalGraphSystem, error) {
	
	// Create system
	system, err := tgf.CreateTemporalGraphSystem(localStorage, distributedStorage, encryptedStorage, backupManager)
	if err != nil {
		return nil, fmt.Errorf("failed to create system: %w", err)
	}
	
	// Load graph data
	err = system.PersistenceManager.LoadTemporalGraph(ctx)
	if err != nil {
		return nil, fmt.Errorf("failed to load temporal graph: %w", err)
	}
	
	return system, nil
}

// DefaultTemporalConfig returns default configuration for temporal graph
func DefaultTemporalConfig() *TemporalConfig {
	return &TemporalConfig{
		MaxDepth: 100,
		StalenessWeights: &StalenessWeights{
			TimeWeight:       0.3,
			InfluenceWeight:  0.4,
			ActivityWeight:   0.2,
			ImportanceWeight: 0.1,
			ComplexityWeight: 0.1,
			DependencyWeight: 0.3,
		},
		CacheTimeout: time.Minute * 15,
		
		InfluenceAnalysisConfig: &InfluenceAnalysisConfig{
			DampingFactor:           0.85,
			MaxIterations:           100,
			ConvergenceThreshold:    1e-6,
			CacheValidDuration:      time.Minute * 30,
			EnableCentralityMetrics: true,
			EnableCommunityDetection: true,
		},
		
		NavigationConfig: &NavigationConfig{
			MaxNavigationHistory: 100,
			BookmarkRetention:    time.Hour * 24 * 30, // 30 days
			SessionTimeout:       time.Hour * 2,
			EnablePathCaching:    true,
		},
		
		QueryConfig: &QueryConfig{
			DefaultMaxHops:          10,
			MaxQueryResults:         1000,
			QueryTimeout:            time.Second * 30,
			CacheQueryResults:       true,
			EnableQueryOptimization: true,
		},
		
		PersistenceConfig: &PersistenceConfig{
			EnableLocalStorage:       true,
			EnableDistributedStorage: true,
			EnableEncryption:         true,
			EncryptionRoles:          []string{"analyst", "architect", "developer"},
			SyncInterval:             time.Minute * 15,
			ConflictResolutionStrategy: "latest_wins",
			EnableAutoSync:           true,
			MaxSyncRetries:           3,
			BatchSize:                50,
			FlushInterval:            time.Second * 30,
			EnableWriteBuffer:        true,
			EnableAutoBackup:         true,
			BackupInterval:           time.Hour * 6,
			RetainBackupCount:        10,
			KeyPrefix:                "temporal_graph",
			NodeKeyPattern:           "temporal_graph/nodes/%s",
			GraphKeyPattern:          "temporal_graph/graph/%s",
			MetadataKeyPattern:       "temporal_graph/metadata/%s",
		},
		
		EnableCaching:      true,
		EnableCompression:  false,
		EnableMetrics:      true,
		EnableDebugLogging: false,
		EnableValidation:   true,
	}
}

// Component factory functions

func NewConflictDetector(graph *temporalGraphImpl) ConflictDetector {
	return &conflictDetectorImpl{
		graph: graph,
	}
}

func NewPatternAnalyzer(graph *temporalGraphImpl) PatternAnalyzer {
	return &patternAnalyzerImpl{
		graph: graph,
	}
}

func NewVersionManager(graph *temporalGraphImpl, persistence *persistenceManagerImpl) VersionManager {
	return &versionManagerImpl{
		graph:       graph,
		persistence: persistence,
	}
}

func NewHistoryManager(graph *temporalGraphImpl, persistence *persistenceManagerImpl) HistoryManager {
	return &historyManagerImpl{
		graph:       graph,
		persistence: persistence,
	}
}

func NewMetricsCollector(graph *temporalGraphImpl) MetricsCollector {
	return &metricsCollectorImpl{
		graph: graph,
	}
}

// Basic implementations for the remaining interfaces

type conflictDetectorImpl struct {
	graph *temporalGraphImpl
}

func (cd *conflictDetectorImpl) DetectTemporalConflicts(ctx context.Context) ([]*TemporalConflict, error) {
	// Implementation would scan for conflicts in temporal data
	return make([]*TemporalConflict, 0), nil
}

func (cd *conflictDetectorImpl) DetectInconsistentDecisions(ctx context.Context) ([]*DecisionInconsistency, error) {
	// Implementation would detect inconsistent decision metadata
	return make([]*DecisionInconsistency, 0), nil
}

func (cd *conflictDetectorImpl) ValidateDecisionSequence(ctx context.Context, address ucxl.Address) (*SequenceValidation, error) {
	// Implementation would validate decision sequence for logical consistency
	return &SequenceValidation{
		Address:        address,
		Valid:          true,
		Issues:         make([]string, 0),
		Warnings:       make([]string, 0),
		ValidatedAt:    time.Now(),
		SequenceLength: 0,
		IntegrityScore: 1.0,
	}, nil
}

func (cd *conflictDetectorImpl) ResolveTemporalConflict(ctx context.Context, conflict *TemporalConflict) (*ConflictResolution, error) {
	// Implementation would resolve specific temporal conflicts
	return &ConflictResolution{
		ConflictID:    conflict.ID,
		Resolution:    "auto_resolved",
		ResolvedAt:    time.Now(),
		ResolvedBy:    "system",
		Confidence:    0.8,
	}, nil
}

func (cd *conflictDetectorImpl) GetConflictResolutionHistory(ctx context.Context, address ucxl.Address) ([]*ConflictResolution, error) {
	// Implementation would return history of resolved conflicts
	return make([]*ConflictResolution, 0), nil
}

type patternAnalyzerImpl struct {
	graph *temporalGraphImpl
}

func (pa *patternAnalyzerImpl) AnalyzeDecisionPatterns(ctx context.Context) ([]*DecisionPattern, error) {
	// Implementation would identify patterns in decision-making
	return make([]*DecisionPattern, 0), nil
}

func (pa *patternAnalyzerImpl) AnalyzeEvolutionPatterns(ctx context.Context) ([]*EvolutionPattern, error) {
	// Implementation would identify patterns in context evolution
	return make([]*EvolutionPattern, 0), nil
}

func (pa *patternAnalyzerImpl) DetectAnomalousDecisions(ctx context.Context) ([]*AnomalousDecision, error) {
	// Implementation would detect unusual decision patterns
	return make([]*AnomalousDecision, 0), nil
}

func (pa *patternAnalyzerImpl) PredictNextDecision(ctx context.Context, address ucxl.Address) ([]*DecisionPrediction, error) {
	// Implementation would predict likely next decisions
	return make([]*DecisionPrediction, 0), nil
}

func (pa *patternAnalyzerImpl) LearnFromHistory(ctx context.Context, timeRange time.Duration) (*LearningResult, error) {
	// Implementation would learn patterns from historical data
	return &LearningResult{
		TimeRange:       timeRange,
		PatternsLearned: 0,
		NewPatterns:     make([]*DecisionPattern, 0),
		UpdatedPatterns: make([]*DecisionPattern, 0),
		LearnedAt:       time.Now(),
	}, nil
}

func (pa *patternAnalyzerImpl) GetPatternStats() (*PatternStatistics, error) {
	// Implementation would return pattern analysis statistics
	return &PatternStatistics{
		TotalPatterns:        0,
		PatternsByType:       make(map[PatternType]int),
		AverageConfidence:    0.0,
		MostFrequentPatterns: make([]*DecisionPattern, 0),
		RecentPatterns:       make([]*DecisionPattern, 0),
		LastAnalysisAt:       time.Now(),
	}, nil
}

type versionManagerImpl struct {
	graph       *temporalGraphImpl
	persistence *persistenceManagerImpl
}

func (vm *versionManagerImpl) CreateVersion(ctx context.Context, address ucxl.Address, 
	contextNode *slurpContext.ContextNode, metadata *VersionMetadata) (*TemporalNode, error) {
	// Implementation would create a new temporal version
	return vm.graph.EvolveContext(ctx, address, contextNode, metadata.Reason, metadata.Decision)
}

func (vm *versionManagerImpl) GetVersion(ctx context.Context, address ucxl.Address, version int) (*TemporalNode, error) {
	// Implementation would retrieve a specific version
	return vm.graph.GetVersionAtDecision(ctx, address, version)
}

func (vm *versionManagerImpl) ListVersions(ctx context.Context, address ucxl.Address) ([]*VersionInfo, error) {
	// Implementation would list all versions for a context
	history, err := vm.graph.GetEvolutionHistory(ctx, address)
	if err != nil {
		return nil, err
	}
	
	versions := make([]*VersionInfo, len(history))
	for i, node := range history {
		versions[i] = &VersionInfo{
			Address:      node.UCXLAddress,
			Version:      node.Version,
			CreatedAt:    node.Timestamp,
			Creator:      "unknown", // Would get from decision metadata
			ChangeReason: node.ChangeReason,
			DecisionID:   node.DecisionID,
		}
	}
	
	return versions, nil
}

func (vm *versionManagerImpl) CompareVersions(ctx context.Context, address ucxl.Address, 
	version1, version2 int) (*VersionComparison, error) {
	// Implementation would compare two temporal versions
	return &VersionComparison{
		Address:       address,
		Version1:      version1,
		Version2:      version2,
		Differences:   make([]*VersionDiff, 0),
		Similarity:    1.0,
		ChangedFields: make([]string, 0),
		ComparedAt:    time.Now(),
	}, nil
}

func (vm *versionManagerImpl) MergeVersions(ctx context.Context, address ucxl.Address, 
	versions []int, strategy MergeStrategy) (*TemporalNode, error) {
	// Implementation would merge multiple versions
	return vm.graph.GetLatestVersion(ctx, address)
}

func (vm *versionManagerImpl) TagVersion(ctx context.Context, address ucxl.Address, version int, tags []string) error {
	// Implementation would add tags to a version
	return nil
}

func (vm *versionManagerImpl) GetVersionTags(ctx context.Context, address ucxl.Address, version int) ([]string, error) {
	// Implementation would get tags for a version
	return make([]string, 0), nil
}

type historyManagerImpl struct {
	graph       *temporalGraphImpl
	persistence *persistenceManagerImpl
}

func (hm *historyManagerImpl) GetFullHistory(ctx context.Context, address ucxl.Address) (*ContextHistory, error) {
	// Implementation would get complete history for a context
	history, err := hm.graph.GetEvolutionHistory(ctx, address)
	if err != nil {
		return nil, err
	}
	
	return &ContextHistory{
		Address:     address,
		Versions:    history,
		GeneratedAt: time.Now(),
	}, nil
}

func (hm *historyManagerImpl) GetHistoryRange(ctx context.Context, address ucxl.Address, 
	startHop, endHop int) (*ContextHistory, error) {
	// Implementation would get history within a specific range
	return hm.GetFullHistory(ctx, address)
}

func (hm *historyManagerImpl) SearchHistory(ctx context.Context, criteria *HistorySearchCriteria) ([]*HistoryMatch, error) {
	// Implementation would search history using criteria
	return make([]*HistoryMatch, 0), nil
}

func (hm *historyManagerImpl) ExportHistory(ctx context.Context, address ucxl.Address, format string) ([]byte, error) {
	// Implementation would export history in various formats
	return []byte{}, nil
}

func (hm *historyManagerImpl) ImportHistory(ctx context.Context, address ucxl.Address, data []byte, format string) error {
	// Implementation would import history from external sources
	return nil
}

func (hm *historyManagerImpl) ArchiveHistory(ctx context.Context, beforeTime time.Time) (*ArchiveResult, error) {
	// Implementation would archive old history data
	return &ArchiveResult{
		ArchiveID:     fmt.Sprintf("archive-%d", time.Now().Unix()),
		ArchivedAt:    time.Now(),
		ItemsArchived: 0,
	}, nil
}

func (hm *historyManagerImpl) RestoreHistory(ctx context.Context, archiveID string) (*RestoreResult, error) {
	// Implementation would restore archived history data
	return &RestoreResult{
		ArchiveID:     archiveID,
		RestoredAt:    time.Now(),
		ItemsRestored: 0,
	}, nil
}

type metricsCollectorImpl struct {
	graph *temporalGraphImpl
}

func (mc *metricsCollectorImpl) CollectTemporalMetrics(ctx context.Context) (*TemporalMetrics, error) {
	// Implementation would collect comprehensive temporal metrics
	return &TemporalMetrics{
		TotalNodes:           len(mc.graph.nodes),
		TotalDecisions:       len(mc.graph.decisions),
		ActiveContexts:       len(mc.graph.addressToNodes),
		InfluenceConnections: mc.calculateInfluenceConnections(),
		CollectedAt:          time.Now(),
	}, nil
}

func (mc *metricsCollectorImpl) GetDecisionVelocity(ctx context.Context, timeWindow time.Duration) (*VelocityMetrics, error) {
	// Implementation would calculate decision-making velocity
	return &VelocityMetrics{
		DecisionsPerHour: 0.0,
		DecisionsPerDay:  0.0,
		DecisionsPerWeek: 0.0,
		TimeWindow:       timeWindow,
	}, nil
}

func (mc *metricsCollectorImpl) GetEvolutionMetrics(ctx context.Context) (*EvolutionMetrics, error) {
	// Implementation would get context evolution metrics
	return &EvolutionMetrics{
		ContextsEvolved:   0,
		AverageEvolutions: 0.0,
		MajorEvolutions:   0,
		MinorEvolutions:   0,
	}, nil
}

func (mc *metricsCollectorImpl) GetInfluenceMetrics(ctx context.Context) (*InfluenceMetrics, error) {
	// Implementation would get influence relationship metrics
	return &InfluenceMetrics{
		TotalRelationships: mc.calculateInfluenceConnections(),
	}, nil
}

func (mc *metricsCollectorImpl) GetQualityMetrics(ctx context.Context) (*QualityMetrics, error) {
	// Implementation would get temporal data quality metrics
	return &QualityMetrics{
		DataCompleteness:    1.0,
		DataConsistency:     1.0,
		DataAccuracy:        1.0,
		AverageConfidence:   0.8,
		ConflictsDetected:   0,
		ConflictsResolved:   0,
		LastQualityCheck:    time.Now(),
	}, nil
}

func (mc *metricsCollectorImpl) ResetMetrics(ctx context.Context) error {
	// Implementation would reset all collected metrics
	return nil
}

func (mc *metricsCollectorImpl) calculateInfluenceConnections() int {
	total := 0
	for _, influences := range mc.graph.influences {
		total += len(influences)
	}
	return total
}