elif-http 0.8.8

//! HTTP server error types
//!
//! Comprehensive error handling for HTTP operations, integrating with
//! the elif framework error system.

use thiserror::Error;

/// Result type for HTTP operations
pub type HttpResult<T> = Result<T, HttpError>;

/// HTTP server errors
#[derive(Error, Debug)]
pub enum HttpError {
    #[error("Server startup failed: {message}")]
    StartupFailed { message: String },

    #[error("Server shutdown failed: {message}")]
    ShutdownFailed { message: String },

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

    #[error("Service resolution failed: {service}")]
    ServiceResolutionFailed { service: String },

    #[error("Request timeout")]
    RequestTimeout,

    #[error("Request too large: {size} bytes exceeds limit of {limit} bytes")]
    RequestTooLarge { size: usize, limit: usize },

    #[error("Invalid request: {message}")]
    BadRequest { message: String },

    #[error("Internal server error: {message}")]
    InternalError { message: String },

    #[error("Health check failed: {reason}")]
    HealthCheckFailed { reason: String },

    #[error("Database error: {message}")]
    DatabaseError { message: String },

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

    #[error("Resource not found: {resource}")]
    NotFound { resource: String },

    #[error("Resource already exists: {message}")]
    Conflict { message: String },

    #[error("Unauthorized access")]
    Unauthorized,

    #[error("Access forbidden: {message}")]
    Forbidden { message: String },
}

impl HttpError {
    /// Create a startup error
    pub fn startup<T: Into<String>>(message: T) -> Self {
        HttpError::StartupFailed {
            message: message.into(),
        }
    }

    /// Create a shutdown error
    pub fn shutdown<T: Into<String>>(message: T) -> Self {
        HttpError::ShutdownFailed {
            message: message.into(),
        }
    }

    /// Create a configuration error
    pub fn config<T: Into<String>>(message: T) -> Self {
        HttpError::ConfigError {
            message: message.into(),
        }
    }

    /// Create a service resolution error
    pub fn service_resolution<T: Into<String>>(service: T) -> Self {
        HttpError::ServiceResolutionFailed {
            service: service.into(),
        }
    }

    /// Create a bad request error
    pub fn bad_request<T: Into<String>>(message: T) -> Self {
        HttpError::BadRequest {
            message: message.into(),
        }
    }

    /// Create an internal error
    pub fn internal<T: Into<String>>(message: T) -> Self {
        HttpError::InternalError {
            message: message.into(),
        }
    }

    /// Create a health check error
    pub fn health_check<T: Into<String>>(reason: T) -> Self {
        HttpError::HealthCheckFailed {
            reason: reason.into(),
        }
    }

    /// Create a database error
    pub fn database_error<T: Into<String>>(message: T) -> Self {
        HttpError::DatabaseError {
            message: message.into(),
        }
    }

    /// Create a validation error
    pub fn validation_error<T: Into<String>>(message: T) -> Self {
        HttpError::ValidationError {
            message: message.into(),
        }
    }

    /// Create a not found error
    pub fn not_found<T: Into<String>>(resource: T) -> Self {
        HttpError::NotFound {
            resource: resource.into(),
        }
    }

    /// Create a conflict error
    pub fn conflict<T: Into<String>>(message: T) -> Self {
        HttpError::Conflict {
            message: message.into(),
        }
    }

    /// Create an unauthorized error
    pub fn unauthorized() -> Self {
        HttpError::Unauthorized
    }

    /// Create a forbidden error
    pub fn forbidden<T: Into<String>>(message: T) -> Self {
        HttpError::Forbidden {
            message: message.into(),
        }
    }

    /// Create a timeout error
    pub fn timeout() -> Self {
        HttpError::RequestTimeout
    }

    /// Create a payload too large error with specific sizes
    pub fn payload_too_large(size: usize, limit: usize) -> Self {
        HttpError::RequestTooLarge { size, limit }
    }

    /// Add additional detail to error (for now, just returns self - future enhancement)
    pub fn with_detail<T: Into<String>>(self, _detail: T) -> Self {
        self
    }

    /// Get error code for consistent API responses
    pub fn error_code(&self) -> &'static str {
        match self {
            HttpError::StartupFailed { .. } => "SERVER_STARTUP_FAILED",
            HttpError::ShutdownFailed { .. } => "SERVER_SHUTDOWN_FAILED",
            HttpError::ConfigError { .. } => "CONFIGURATION_ERROR",
            HttpError::ServiceResolutionFailed { .. } => "SERVICE_RESOLUTION_FAILED",
            HttpError::RequestTimeout => "REQUEST_TIMEOUT",
            HttpError::RequestTooLarge { .. } => "REQUEST_TOO_LARGE",
            HttpError::BadRequest { .. } => "BAD_REQUEST",
            HttpError::InternalError { .. } => "INTERNAL_ERROR",
            HttpError::HealthCheckFailed { .. } => "HEALTH_CHECK_FAILED",
            HttpError::DatabaseError { .. } => "DATABASE_ERROR",
            HttpError::ValidationError { .. } => "VALIDATION_ERROR",
            HttpError::NotFound { .. } => "RESOURCE_NOT_FOUND",
            HttpError::Conflict { .. } => "RESOURCE_CONFLICT",
            HttpError::Unauthorized => "UNAUTHORIZED_ACCESS",
            HttpError::Forbidden { .. } => "ACCESS_FORBIDDEN",
        }
    }
}

// Convert from elif-core ConfigError
impl From<elif_core::ConfigError> for HttpError {
    fn from(err: elif_core::ConfigError) -> Self {
        HttpError::ConfigError {
            message: err.to_string(),
        }
    }
}

// Convert from std::io::Error
impl From<std::io::Error> for HttpError {
    fn from(err: std::io::Error) -> Self {
        HttpError::InternalError {
            message: format!("IO error: {}", err),
        }
    }
}

// Convert from hyper errors
impl From<hyper::Error> for HttpError {
    fn from(err: hyper::Error) -> Self {
        HttpError::InternalError {
            message: format!("Hyper error: {}", err),
        }
    }
}

// Convert from serde_json errors
impl From<serde_json::Error> for HttpError {
    fn from(err: serde_json::Error) -> Self {
        HttpError::InternalError {
            message: format!("JSON serialization error: {}", err),
        }
    }
}

// Convert from ORM ModelError to HttpError
#[cfg(feature = "orm")]
impl From<orm::ModelError> for HttpError {
    fn from(err: orm::ModelError) -> Self {
        match err {
            orm::ModelError::NotFound(table) => HttpError::NotFound { resource: table },
            orm::ModelError::Validation(msg) => HttpError::ValidationError { message: msg },
            orm::ModelError::Database(msg) => HttpError::DatabaseError { message: msg },
            orm::ModelError::Connection(msg) => HttpError::DatabaseError {
                message: format!("Connection error: {}", msg),
            },
            orm::ModelError::Transaction(msg) => HttpError::DatabaseError {
                message: format!("Transaction error: {}", msg),
            },
            orm::ModelError::Query(msg) => HttpError::BadRequest {
                message: format!("Query error: {}", msg),
            },
            orm::ModelError::Schema(msg) => HttpError::InternalError {
                message: format!("Schema error: {}", msg),
            },
            orm::ModelError::Migration(msg) => HttpError::InternalError {
                message: format!("Migration error: {}", msg),
            },
            orm::ModelError::MissingPrimaryKey => HttpError::BadRequest {
                message: "Missing or invalid primary key".to_string(),
            },
            orm::ModelError::Relationship(msg) => HttpError::BadRequest {
                message: format!("Relationship error: {}", msg),
            },
            orm::ModelError::Serialization(msg) => HttpError::InternalError {
                message: format!("Serialization error: {}", msg),
            },
            orm::ModelError::Event(msg) => HttpError::InternalError {
                message: format!("Event error: {}", msg),
            },
        }
    }
}

// Convert from ORM QueryError to HttpError
#[cfg(feature = "orm")]
impl From<orm::QueryError> for HttpError {
    fn from(err: orm::QueryError) -> Self {
        match err {
            orm::QueryError::InvalidSql(msg) => HttpError::BadRequest {
                message: format!("Invalid SQL query: {}", msg),
            },
            orm::QueryError::MissingFields(msg) => HttpError::BadRequest {
                message: format!("Missing required fields: {}", msg),
            },
            orm::QueryError::InvalidParameter(msg) => HttpError::BadRequest {
                message: format!("Invalid query parameter: {}", msg),
            },
            orm::QueryError::UnsupportedOperation(msg) => HttpError::BadRequest {
                message: format!("Unsupported operation: {}", msg),
            },
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_error_creation() {
        let error = HttpError::startup("Failed to bind to port");
        assert!(matches!(error, HttpError::StartupFailed { .. }));
        assert_eq!(error.error_code(), "SERVER_STARTUP_FAILED");
    }

    #[test]
    fn test_error_codes() {
        assert_eq!(HttpError::bad_request("test").error_code(), "BAD_REQUEST");
        assert_eq!(HttpError::RequestTimeout.error_code(), "REQUEST_TIMEOUT");
        assert_eq!(HttpError::internal("test").error_code(), "INTERNAL_ERROR");
    }

    #[test]
    fn test_config_error_conversion() {
        let config_error = elif_core::ConfigError::validation_failed("Test validation error");
        let http_error = HttpError::from(config_error);
        assert!(matches!(http_error, HttpError::ConfigError { .. }));
    }

    #[test]
    fn test_io_error_conversion() {
        let io_error = std::io::Error::new(std::io::ErrorKind::PermissionDenied, "Access denied");
        let http_error = HttpError::from(io_error);
        assert!(matches!(http_error, HttpError::InternalError { .. }));
    }

    #[test]
    fn test_validation_error_creation() {
        let validation_error = HttpError::validation_error("Field is required");
        assert_eq!(validation_error.error_code(), "VALIDATION_ERROR");
    }
}