//! Error types for the Trading Service - Using Shared Library Types

// REMOVED: All pub use statements eliminated per cleanup requirements
// Use direct import: common::error::CommonError

/// Trading service specific error extensions
///
/// For cases where we need domain-specific error information
#[derive(Debug, thiserror::Error)]
pub enum TradingServiceError {
    /// Shared library error with context
    #[error("Trading service error: {0}")]
    Common(#[from] common::error::CommonError),

    /// `Order` validation failed with specific trading context
    #[error("Order validation failed: {reason}")]
    OrderValidation { reason: String },

    /// Risk management violation with trading-specific details
    #[error("Risk violation: {violation_type} - {message}")]
    RiskViolation {
        violation_type: String,
        message: String,
    },

    /// ML model error with model context
    #[error("ML model error: {model_name} - {message}")]
    MLModel { model_name: String, message: String },

    /// Database operation error
    #[error("Database error: {source}")]
    DatabaseError {
        source: Box<dyn std::error::Error + Send + Sync>,
    },

    /// Configuration error
    #[error("Configuration error: {message}")]
    ConfigurationError { message: String },

    /// Rate limit exceeded error
    #[error("Rate limit exceeded: {message}")]
    RateLimitExceeded { message: String },

    /// Subscription timeout error
    #[error("Subscription timeout: {message}")]
    SubscriptionTimeout { message: String },

    /// Subscription closed error
    #[error("Subscription closed: {message}")]
    SubscriptionClosed { message: String },

    /// Internal service error
    #[error("Internal error: {message}")]
    Internal { message: String },

    /// Timestamp conversion error
    #[error("Invalid timestamp: {timestamp} - cannot convert to DateTime")]
    TimestampConversion { timestamp: i64 },

    /// Validation error
    #[error("Validation error: {message}")]
    ValidationError { message: String },
}

/// Result type for trading service operations
pub type TradingServiceResult<T> = std::result::Result<T, TradingServiceError>;

/// Convenience type alias using common result
pub type Result<T> = TradingServiceResult<T>;

/// Convert TradingServiceError to tonic::Status for gRPC responses
impl From<TradingServiceError> for tonic::Status {
    fn from(err: TradingServiceError) -> Self {
        match err {
            TradingServiceError::Common(common_err) => {
                // Leverage shared error to gRPC status conversion
                match common_err {
                    common::error::CommonError::Validation(ref msg) => {
                        tonic::Status::invalid_argument(format!("Validation error: {}", msg))
                    },
                    common::error::CommonError::Configuration(ref msg) => {
                        tonic::Status::invalid_argument(format!("Configuration error: {}", msg))
                    },
                    common::error::CommonError::Network(ref msg) => {
                        tonic::Status::unavailable(format!("Network error: {}", msg))
                    },
                    common::error::CommonError::Database(ref db_err) => {
                        tonic::Status::internal(format!("Database error: {}", db_err))
                    },
                    common::error::CommonError::Service { category, message } => match category {
                        common::error::ErrorCategory::Authentication => {
                            tonic::Status::unauthenticated(message)
                        },
                        common::error::ErrorCategory::Resource => {
                            tonic::Status::not_found(message)
                        },
                        common::error::ErrorCategory::Validation => {
                            tonic::Status::invalid_argument(message)
                        },
                        _ => tonic::Status::internal(format!("{}: {}", category, message)),
                    },
                    common::error::CommonError::Timeout { actual_ms, max_ms } => {
                        tonic::Status::deadline_exceeded(format!(
                            "Operation timed out: {}ms (max: {}ms)",
                            actual_ms, max_ms
                        ))
                    },
                    common::error::CommonError::RegressionDetected {
                        ref metric,
                        value,
                        consecutive,
                        ..
                    } => tonic::Status::failed_precondition(format!(
                        "ML training regression detected: metric={} value={:.6e} \
                         consecutive_epochs={}",
                        metric, value, consecutive
                    )),
                }
            },
            TradingServiceError::OrderValidation { reason } => {
                tonic::Status::invalid_argument(format!("Order validation failed: {}", reason))
            },
            TradingServiceError::RiskViolation {
                violation_type,
                message,
            } => tonic::Status::failed_precondition(format!(
                "Risk violation {}: {}",
                violation_type, message
            )),
            TradingServiceError::MLModel {
                model_name,
                message,
            } => tonic::Status::internal(format!("ML model {} error: {}", model_name, message)),
            TradingServiceError::DatabaseError { source } => {
                tonic::Status::internal(format!("Database error: {}", source))
            },
            TradingServiceError::ConfigurationError { message } => {
                tonic::Status::internal(format!("Configuration error: {}", message))
            },
            TradingServiceError::RateLimitExceeded { message } => {
                tonic::Status::resource_exhausted(format!("Rate limit exceeded: {}", message))
            },
            TradingServiceError::SubscriptionTimeout { message } => {
                tonic::Status::deadline_exceeded(format!("Subscription timeout: {}", message))
            },
            TradingServiceError::SubscriptionClosed { message } => {
                tonic::Status::cancelled(format!("Subscription closed: {}", message))
            },
            TradingServiceError::Internal { message } => {
                tonic::Status::internal(format!("Internal error: {}", message))
            },
            TradingServiceError::TimestampConversion { timestamp } => {
                tonic::Status::invalid_argument(format!(
                    "Invalid timestamp conversion: {}",
                    timestamp
                ))
            },
            TradingServiceError::ValidationError { message } => {
                tonic::Status::invalid_argument(format!("Validation error: {}", message))
            },
        }
    }
}