server

type Config struct {
	// Address to bind to (default: "127.0.0.1" - localhost only for security)
	// Set to "0.0.0.0" to listen on all interfaces (required for Docker/external access)
	Address string
	// PerDBYAMLOverrides carries the `databases:` map parsed from
	// nornicdb.yaml. Server.New consumes it during system-DB load to seed
	// dbconfig.Store on first boot via LoadWithYAMLDefaults — admin-API
	// edits remain authoritative across restarts. Must be set BEFORE
	// server.New runs; the post-construction setter is gone because the
	// store load happens inside New and won't see late assignments.
	PerDBYAMLOverrides map[string]map[string]string
	// Port to listen on (default: 7474)
	Port int
	// BoltPort is the port the Bolt protocol server listens on. Surfaced
	// in the discovery response so browser clients constructing
	// neo4j-driver Bolt-over-WS sessions know where to connect.
	// Default: 7687 when zero.
	BoltPort int
	// ReadTimeout for requests
	ReadTimeout time.Duration
	// WriteTimeout for responses
	WriteTimeout time.Duration
	// IdleTimeout for keep-alive connections
	IdleTimeout time.Duration
	// MaxRequestSize in bytes (default: 10MB)
	MaxRequestSize int64
	// EnableCORS for cross-origin requests (default: false for security)
	EnableCORS bool
	// CORSOrigins allowed origins (default: empty - must be explicitly configured)
	// WARNING: Never use "*" with credentials - this is a CSRF vulnerability
	CORSOrigins []string
	// EnableCompression for responses
	EnableCompression bool

	// Rate Limiting Configuration (DoS protection)
	// RateLimitEnabled enables IP-based rate limiting (default: true)
	RateLimitEnabled bool
	// RateLimitPerMinute max requests per IP per minute (default: 100)
	RateLimitPerMinute int
	// RateLimitPerHour max requests per IP per hour (default: 3000)
	RateLimitPerHour int
	// RateLimitBurst max burst size for short request spikes (default: 20)
	RateLimitBurst int
	// TLSCertFile for HTTPS
	TLSCertFile string
	// TLSKeyFile for HTTPS
	TLSKeyFile string

	// HTTP/2 Configuration
	// HTTP/2 is always enabled (backwards compatible with HTTP/1.1)
	// HTTP/2 provides multiplexing, header compression, and improved performance
	// HTTP/1.1 clients continue to work normally
	// HTTP2MaxConcurrentStreams limits the number of concurrent streams per connection (default: 250)
	// - 250: Go's internal default, matches standard library behavior (default)
	// - 100: Lower memory usage, good for resource-constrained environments
	// - 500-1000: High concurrency scenarios, uses more memory per connection
	// - Very high values (>1000) are not recommended due to DoS attack risk
	HTTP2MaxConcurrentStreams uint32

	// MCP Configuration (Model Context Protocol)
	// MCPEnabled controls whether the MCP server is started (default: true)
	// Set to false to disable MCP tools entirely
	// Env: NORNICDB_MCP_ENABLED=true|false
	MCPEnabled bool

	// Embedding Configuration (for vector search)
	// EmbeddingEnabled turns on automatic embedding generation
	EmbeddingEnabled bool
	// EmbeddingProvider: "ollama" or "openai" or "local"
	EmbeddingProvider string
	// EmbeddingAPIURL is the base URL (e.g., http://localhost:11434)
	EmbeddingAPIURL string
	// EmbeddingModel is the model name (e.g., bge-m3)
	EmbeddingModel string
	// EmbeddingDimensions is expected vector size (e.g., 1024)
	EmbeddingDimensions int
	// EmbeddingCacheSize is max embeddings to cache (0 = disabled, default: 10000)
	// Each cached embedding uses ~4KB (1024 dims × 4 bytes)
	EmbeddingCacheSize int
	// EmbeddingAPIKey is the API key for authenticated embedding providers (OpenAI, Cloudflare Workers AI, etc.)
	// Env: NORNICDB_EMBEDDING_API_KEY
	EmbeddingAPIKey string
	// ModelsDir is the directory containing local GGUF models
	// Env: NORNICDB_MODELS_DIR (default: ./models)
	ModelsDir string
	// Embedding llama.cpp context features (passthrough for local GGUF models)
	EmbeddingCtxType       int // Env: NORNICDB_EMBEDDING_CTX_TYPE
	EmbeddingPoolingType   int // Env: NORNICDB_EMBEDDING_POOLING_TYPE
	EmbeddingAttentionType int // Env: NORNICDB_EMBEDDING_ATTENTION_TYPE
	EmbeddingFlashAttn     int // Env: NORNICDB_EMBEDDING_FLASH_ATTN

	// Slow Query Logging Configuration
	// SlowQueryEnabled turns on slow query logging (default: true)
	SlowQueryEnabled bool
	// D-04d: SlowQueryThreshold and SlowQueryLogFile collapsed into
	// pkg/config.LoggingConfig (the single source of truth). Threaded into
	// the server via the Logging field below; readers go through
	// s.config.Logging.SlowQueryThreshold / .SlowQueryLogFile.
	//
	// Logging carries the runtime LoggingConfig snapshot. Populated by
	// cmd/nornicdb/main.go from cfg.Logging at server construction.
	Logging nornicConfig.LoggingConfig

	// Headless Mode Configuration
	// Headless disables the web UI and browser-related endpoints
	// Set to true for API-only deployments (e.g., embedded use, microservices)
	// Env: NORNICDB_HEADLESS=true|false
	Headless bool

	// BasePath for deployment behind a reverse proxy with URL prefix
	// Example: "/nornicdb" when deployed at https://example.com/nornicdb/
	// Leave empty for root deployment (default)
	// Env: NORNICDB_BASE_PATH
	BasePath string

	// Plugins Configuration
	// PluginsDir is the directory for APOC/function plugins
	// Env: NORNICDB_PLUGINS_DIR
	PluginsDir string
	// HeimdallPluginsDir is the directory for Heimdall plugins
	// Env: NORNICDB_HEIMDALL_PLUGINS_DIR
	HeimdallPluginsDir string

	// Features configuration (passed from main config loading)
	// This contains feature flags like HeimdallEnabled loaded from YAML/env
	Features *nornicConfig.FeatureFlagsConfig

	// Debug/Profiling Configuration
	// EnablePprof enables /debug/pprof endpoints for performance profiling
	// WARNING: Only enable in development/testing environments
	// Env: NORNICDB_ENABLE_PPROF=true|false
	EnablePprof bool

	// Logger is the structured-logging entrypoint per Phase 2 D-01.
	// If nil, a discard-handler fallback is installed at New() — graceful
	// degrade for the transitional period; ctors will be tightened post-M1
	// once all consumers are updated to pass an explicit logger via
	// observability.Provider.Logger().
	Logger *slog.Logger
}

type GraphNode struct {
	ID         string                 `json:"id"`
	ElementID  string                 `json:"elementId"`
	Labels     []string               `json:"labels"`
	Properties map[string]interface{} `json:"properties"`
}

type GraphRelationship struct {
	ID         string                 `json:"id"`
	ElementID  string                 `json:"elementId"`
	Type       string                 `json:"type"`
	StartNode  string                 `json:"startNodeElementId"`
	EndNode    string                 `json:"endNodeElementId"`
	Properties map[string]interface{} `json:"properties"`
}

type GraphResult struct {
	Nodes         []GraphNode         `json:"nodes"`
	Relationships []GraphRelationship `json:"relationships"`
}

type IPRateLimiter struct {
	// contains filtered or unexported fields
}

type NotificationPos struct {
	Offset int `json:"offset"`
	Line   int `json:"line"`
	Column int `json:"column"`
}

type QueryError struct {
	Code    string `json:"code"`
	Message string `json:"message"`
}

type QueryResult struct {
	Columns []string    `json:"columns"`
	Data    []ResultRow `json:"data"`
	Stats   *QueryStats `json:"stats,omitempty"`
}

type QueryStats struct {
	NodesCreated         int  `json:"nodes_created,omitempty"`
	NodesDeleted         int  `json:"nodes_deleted,omitempty"`
	RelationshipsCreated int  `json:"relationships_created,omitempty"`
	RelationshipsDeleted int  `json:"relationships_deleted,omitempty"`
	PropertiesSet        int  `json:"properties_set,omitempty"`
	LabelsAdded          int  `json:"labels_added,omitempty"`
	LabelsRemoved        int  `json:"labels_removed,omitempty"`
	IndexesAdded         int  `json:"indexes_added,omitempty"`
	IndexesRemoved       int  `json:"indexes_removed,omitempty"`
	ConstraintsAdded     int  `json:"constraints_added,omitempty"`
	ConstraintsRemoved   int  `json:"constraints_removed,omitempty"`
	ContainsUpdates      bool `json:"contains_updates,omitempty"`
}

type ResultRow struct {
	Row   []interface{} `json:"row"`
	Meta  []interface{} `json:"meta,omitempty"`
	Graph *GraphResult  `json:"graph,omitempty"`
}

type Server struct {
	// contains filtered or unexported fields
}

type ServerNotification struct {
	Code        string           `json:"code"`
	Severity    string           `json:"severity"`
	Title       string           `json:"title"`
	Description string           `json:"description"`
	Position    *NotificationPos `json:"position,omitempty"`
}

type ServerStats struct {
	Uptime         time.Duration `json:"uptime"`
	RequestCount   int64         `json:"request_count"`
	ErrorCount     int64         `json:"error_count"`
	ActiveRequests int64         `json:"active_requests"`
	Version        string        `json:"version"`
	Commit         string        `json:"commit"`
	BuildTime      string        `json:"build_time"`
}

type StatementRequest struct {
	Statement          string                 `json:"statement"`
	Parameters         map[string]interface{} `json:"parameters,omitempty"`
	ResultDataContents []string               `json:"resultDataContents,omitempty"` // ["row", "graph"]
	IncludeStats       bool                   `json:"includeStats,omitempty"`
}

type TransactionInfo struct {
	Expires string `json:"expires"` // RFC1123 format
}

type TransactionRequest struct {
	Statements []StatementRequest `json:"statements"`
}

type TransactionResponse struct {
	Results       []QueryResult        `json:"results"`
	Errors        []QueryError         `json:"errors"`
	Commit        string               `json:"commit,omitempty"`        // URL to commit (for open transactions)
	Transaction   *TransactionInfo     `json:"transaction,omitempty"`   // Transaction state
	LastBookmarks []string             `json:"lastBookmarks,omitempty"` // Bookmark for causal consistency
	Notifications []ServerNotification `json:"notifications,omitempty"` // Server notifications
	Receipt       interface{}          `json:"receipt,omitempty"`       // Mutation receipt (tx_id, wal_seq_start, wal_seq_end, hash)
	Optimistic    interface{}          `json:"optimistic,omitempty"`    // Optimistic mutation metadata (e.g., created IDs)
}