//! Comprehensive error types for the RTX Transformers crate

use rtx_runtime::error::RuntimeError;
use thiserror::Error;

/// Result type alias for transformer operations
pub type Result<T> = std::result::Result<T, TransformerError>;

/// Comprehensive error types for transformer operations
#[derive(Error, Debug)]
pub enum TransformerError {
    /// Generic errors
    #[error("Transformer error: {0}")]
    Generic(String),

    /// I/O errors
    #[error("I/O error: {0}")]
    IoError(#[from] std::io::Error),

    /// Runtime errors
    #[error("Runtime error: {0}")]
    RuntimeError(#[from] RuntimeError),

    /// Anyhow errors
    #[error("Error: {0}")]
    Anyhow(#[from] anyhow::Error),

    /// Training-related errors
    #[error("Training error: {0}")]
    Training(String),

    /// Gradient accumulation errors
    #[error("Gradient accumulation error: {0}")]
    GradientAccumulation(String),

    /// Mixed precision training errors
    #[error("Mixed precision error: {0}")]
    MixedPrecision(String),

    /// Model architecture errors
    #[error("Model architecture error: {0}")]
    Architecture(String),

    /// Tokenization errors
    #[error("Tokenization error: {0}")]
    Tokenization(String),

    /// Optimization errors
    #[error("Optimization error: {0}")]
    Optimization(String),

    /// Scheduling errors
    #[error("Scheduling error: {0}")]
    Scheduling(String),

    /// Tensor operation errors
    #[error("Tensor operation error: {0}")]
    TensorOp(String),

    /// Configuration errors
    #[error("Configuration error: {0}")]
    Config(String),

    /// Revolutionary feature errors (quantum, neuromorphic, edge)
    #[error("Revolutionary feature error ({0}): {1}")]
    Revolutionary(String, String),

    /// CUDA/GPU errors
    #[error("GPU error: {0}")]
    Gpu(String),

    /// Distributed training errors
    #[error("Distributed training error: {0}")]
    Distributed(String),

    /// Checkpoint save/load errors
    #[error("Checkpoint error: {0}")]
    Checkpoint(String),

    /// Data loading errors
    #[error("Data loading error: {0}")]
    DataLoading(String),

    /// Validation errors
    #[error("Validation error: {0}")]
    Validation(String),

    /// Validation errors (alias for Validation)
    #[error("Validation error: {0}")]
    ValidationError(String),

    /// Not implemented error
    #[error("Not implemented: {0}")]
    NotImplemented(String),

    /// Tensor Core optimization errors
    #[error("Tensor Core error: {0}")]
    TensorCoreError(String),

    /// Insufficient memory error for edge devices
    #[error("Insufficient memory: required {required}MB, available {available}MB")]
    InsufficientMemory { required: u64, available: u64 },

    /// Edge device capability errors
    #[error("Edge device error: {0}")]
    EdgeDevice(String),

    /// Federated learning coordination errors
    #[error("Federated learning error: {0}")]
    FederatedLearning(String),

    /// Configuration errors for quantum and neuromorphic backends
    #[error("Configuration error: {0}")]
    ConfigError(String),

    /// Neuromorphic processing errors
    #[error("Neuromorphic error: {0}")]
    NeuromorphicError(String),

    /// Architecture errors (alias for Architecture)
    #[error("Architecture error: {0}")]
    ArchitectureError(String),

    /// Tokenization errors (alias for Tokenization)
    #[error("Tokenization error: {0}")]
    TokenizationError(String),

    /// Optimizer errors (lowercase alias for Optimization)
    #[error("Optimizer error: {0}")]
    #[allow(non_camel_case_types)]
    optimizer(String),

    /// Shape mismatch errors
    #[error("Shape mismatch: {0}")]
    #[allow(non_camel_case_types)]
    shape_mismatch(String),

    /// Shape mismatch errors (PascalCase alias)
    #[error("Shape mismatch: {0}")]
    ShapeMismatch(String),

    /// Invalid state errors
    #[error("Invalid state: {0}")]
    InvalidState(String),

    /// Dimension errors
    #[error("Dimension error: {0}")]
    #[allow(non_camel_case_types)]
    dimension(String),

    /// Invalid input errors
    #[error("Invalid input: {0}")]
    InvalidInput(String),

    /// Invalid parameter errors
    #[error("Invalid parameter: {0}")]
    InvalidParameter(String),

    /// Invalid shape errors
    #[error("Invalid shape: {0}")]
    InvalidShape(String),

    /// Serialization errors
    #[error("Serialization error: {0}")]
    SerializationError(String),

    /// Computation errors
    #[error("Computation error: {0}")]
    ComputationError(String),

    /// KAN Networks errors
    #[error("KAN error: {0}")]
    KAN(String),

    /// Configuration errors (alias for Config)
    #[error("Configuration error: {0}")]
    Configuration(String),

    /// Tensor errors from rtx-tensor
    #[error("Tensor error: {0}")]
    TensorError(#[from] rtx_tensor::TensorError),

    /// CUDA kernel errors
    #[error("CUDA kernel error: {0}")]
    KernelNotFound(String),

    /// CUDA runtime errors
    #[error("CUDA runtime error: {0}")]
    CudaRuntime(String),
}

impl TransformerError {
    /// Create a generic error
    pub fn generic<S: Into<String>>(message: S) -> Self {
        Self::Generic(message.into())
    }

    /// Create a training error
    pub fn training<S: Into<String>>(message: S) -> Self {
        Self::Training(message.into())
    }

    /// Create a gradient accumulation error
    pub fn gradient_accumulation<S: Into<String>>(message: S) -> Self {
        Self::GradientAccumulation(message.into())
    }

    /// Create a mixed precision error
    pub fn mixed_precision<S: Into<String>>(message: S) -> Self {
        Self::MixedPrecision(message.into())
    }

    /// Create an architecture error
    pub fn architecture<S: Into<String>>(message: S) -> Self {
        Self::Architecture(message.into())
    }

    /// Create a tokenization error
    pub fn tokenization<S: Into<String>>(message: S) -> Self {
        Self::Tokenization(message.into())
    }

    /// Create an optimization error
    pub fn optimization<S: Into<String>>(message: S) -> Self {
        Self::Optimization(message.into())
    }

    /// Create a scheduling error
    pub fn scheduling<S: Into<String>>(message: S) -> Self {
        Self::Scheduling(message.into())
    }

    /// Create a tensor operation error
    pub fn tensor_op<S: Into<String>>(message: S) -> Self {
        Self::TensorOp(message.into())
    }

    /// Create a configuration error
    pub fn config<S: Into<String>>(message: S) -> Self {
        Self::Config(message.into())
    }

    /// Create a revolutionary feature error
    pub fn revolutionary<S: Into<String>>(feature: S, message: S) -> Self {
        Self::Revolutionary(feature.into(), message.into())
    }

    /// Create a GPU error
    pub fn gpu<S: Into<String>>(message: S) -> Self {
        Self::Gpu(message.into())
    }

    /// Create a distributed training error
    pub fn distributed<S: Into<String>>(message: S) -> Self {
        Self::Distributed(message.into())
    }

    /// Create a checkpoint error
    pub fn checkpoint<S: Into<String>>(message: S) -> Self {
        Self::Checkpoint(message.into())
    }

    /// Create a data loading error
    pub fn data_loading<S: Into<String>>(message: S) -> Self {
        Self::DataLoading(message.into())
    }

    /// Create a validation error
    pub fn validation<S: Into<String>>(message: S) -> Self {
        Self::Validation(message.into())
    }

    /// Create a Tensor Core error
    pub fn tensor_core<S: Into<String>>(message: S) -> Self {
        Self::TensorCoreError(message.into())
    }

    /// Create an insufficient memory error
    #[must_use]
    pub fn insufficient_memory(required: u64, available: u64) -> Self {
        Self::InsufficientMemory {
            required,
            available,
        }
    }

    /// Create an edge device error
    pub fn edge_device<S: Into<String>>(message: S) -> Self {
        Self::EdgeDevice(message.into())
    }

    /// Create a federated learning error
    pub fn federated_learning<S: Into<String>>(message: S) -> Self {
        Self::FederatedLearning(message.into())
    }

    /// Create a configuration error
    pub fn config_error<S: Into<String>>(message: S) -> Self {
        Self::ConfigError(message.into())
    }

    /// Create a neuromorphic error
    pub fn neuromorphic_error<S: Into<String>>(message: S) -> Self {
        Self::NeuromorphicError(message.into())
    }

    /// Create an architecture error (alias)
    pub fn architecture_error<S: Into<String>>(message: S) -> Self {
        Self::ArchitectureError(message.into())
    }

    /// Create a tokenization error (alias)
    pub fn tokenization_error<S: Into<String>>(message: S) -> Self {
        Self::TokenizationError(message.into())
    }

    /// Create an optimizer error (lowercase)
    pub fn optimizer<S: Into<String>>(message: S) -> Self {
        Self::optimizer(message.into())
    }

    /// Create a shape mismatch error
    pub fn shape_mismatch<S: Into<String>>(message: S) -> Self {
        Self::shape_mismatch(message.into())
    }

    /// Create a dimension error
    pub fn dimension<S: Into<String>>(message: S) -> Self {
        Self::dimension(message.into())
    }

    /// Create an invalid input error
    pub fn invalid_input<S: Into<String>>(message: S) -> Self {
        Self::InvalidInput(message.into())
    }

    /// Create an invalid parameter error
    pub fn invalid_parameter<S: Into<String>>(message: S) -> Self {
        Self::InvalidParameter(message.into())
    }

    /// Create an invalid shape error
    pub fn invalid_shape<S: Into<String>>(message: S) -> Self {
        Self::InvalidShape(message.into())
    }

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

    /// Create a serialization error
    pub fn serialization_error<S: Into<String>>(message: S) -> Self {
        Self::SerializationError(message.into())
    }

    /// Create a computation error
    pub fn computation_error<S: Into<String>>(message: S) -> Self {
        Self::ComputationError(message.into())
    }

    /// Create a KAN networks error
    pub fn kan<S: Into<String>>(message: S) -> Self {
        Self::KAN(message.into())
    }
}

// rtx-tensor errors are now handled by the #[from] attribute on TensorError variant

/// Convert from serde JSON errors to SerializationError
#[cfg(feature = "serde")]
impl From<serde_json::Error> for TransformerError {
    fn from(error: serde_json::Error) -> Self {
        Self::SerializationError(format!("JSON serialization error: {}", error))
    }
}

/// Convert from bincode errors to SerializationError
#[cfg(feature = "bincode")]
impl From<bincode::Error> for TransformerError {
    fn from(error: bincode::Error) -> Self {
        Self::SerializationError(format!("Bincode serialization error: {}", error))
    }
}