package graph

// Config holds configuration for graph operations
type Config struct {
	// Query limits
	MaxChainLength     int `json:"max_chain_length"`     // Maximum length for resource chains
	MaxPathHops        int `json:"max_path_hops"`        // Maximum hops for path finding
	MaxNetworkSize     int `json:"max_network_size"`     // Maximum organizations in a network
	MinNetworkSize     int `json:"min_network_size"`     // Minimum organizations in a network
	DefaultResultLimit int `json:"default_result_limit"` // Default limit for query results

	// Distance constraints
	MaxChainDistanceKm float64 `json:"max_chain_distance_km"` // Maximum total distance for chains
	MaxPathDistanceKm  float64 `json:"max_path_distance_km"`  // Maximum distance for paths

	// Economic thresholds
	MinChainValue   float64 `json:"min_chain_value"`   // Minimum economic value for chains
	MinNetworkValue float64 `json:"min_network_value"` // Minimum value for networks

	// Performance settings
	QueryTimeoutSeconds int  `json:"query_timeout_seconds"` // Query timeout in seconds
	EnableGDS           bool `json:"enable_gds"`            // Enable Graph Data Science library
}

// DefaultConfig returns the default configuration
func DefaultConfig() *Config {
	return &Config{
		MaxChainLength:      5,
		MaxPathHops:         4,
		MaxNetworkSize:      20,
		MinNetworkSize:      3,
		DefaultResultLimit:  50,
		MaxChainDistanceKm:  500.0,
		MaxPathDistanceKm:   200.0,
		MinChainValue:       1000.0,
		MinNetworkValue:     5000.0,
		QueryTimeoutSeconds: 30,
		EnableGDS:           false, // Default to false, enable if GDS is installed
	}
}

// Validate validates the configuration
func (c *Config) Validate() error {
	if c.MaxChainLength < 1 {
		return ErrInvalidConfig
	}
	if c.MaxPathHops < 1 {
		return ErrInvalidConfig
	}
	if c.MaxNetworkSize < c.MinNetworkSize {
		return ErrInvalidConfig
	}
	if c.DefaultResultLimit < 1 {
		return ErrInvalidConfig
	}
	return nil
}