//! Error types for the rtx-vision crate

use thiserror::Error;

/// Result type for vision operations
pub type Result<T> = std::result::Result<T, VisionError>;

/// Vision-specific error types
#[derive(Debug, Error)]
pub enum VisionError {
    /// Tensor operation failed
    #[error("Tensor operation failed: {0}")]
    Tensor(#[from] rtx_tensor::TensorError),

    /// Computation operation failed
    #[error("Computation failed: {0}")]
    Computation(String),

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

    /// Initialization error
    #[error("Initialization failed: {0}")]
    Initialization(String),

    /// Autograd operation failed
    #[error("Autograd operation failed: {0}")]
    Autograd(String),

    /// Image processing error
    #[error("Image processing error: {0}")]
    ImageError(#[from] image::ImageError),

    /// Invalid image dimensions
    #[error("Invalid image dimensions: expected {expected}, got {got}")]
    InvalidDimensions { expected: String, got: String },

    /// Invalid patch size
    #[error("Invalid patch size: {size} for image of size {width}x{height}")]
    InvalidPatchSize {
        size: usize,
        width: usize,
        height: usize,
    },

    /// Invalid model configuration
    #[error("Invalid model configuration: {0}")]
    InvalidConfig(String),

    /// Unsupported operation
    #[error("Unsupported operation: {0}")]
    UnsupportedOperation(String),

    /// Shape mismatch
    #[error("Shape mismatch: expected {expected:?}, got {got:?}")]
    ShapeMismatch {
        expected: Vec<usize>,
        got: Vec<usize>,
    },

    /// Invalid number of channels
    #[error("Invalid number of channels: expected {expected}, got {got}")]
    InvalidChannels { expected: usize, got: usize },

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

    /// Generic error with context
    #[error("{0}")]
    Other(String),

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

    /// Tensor operation failed (legacy)
    #[error("Tensor error: {0}")]
    TensorError(String),
}

// Add convenience constructors for common error types
impl VisionError {
    /// Create a computation error
    pub fn computation<S: Into<String>>(msg: S) -> Self {
        VisionError::Computation(msg.into())
    }

    /// Create a shape error
    pub fn shape<S: Into<String>>(msg: S) -> Self {
        VisionError::Shape(msg.into())
    }

    /// Create an initialization error
    pub fn initialization<S: Into<String>>(msg: S) -> Self {
        VisionError::Initialization(msg.into())
    }

    /// Create an autograd error
    pub fn autograd<S: Into<String>>(msg: S) -> Self {
        VisionError::Autograd(msg.into())
    }
}

// TensorError From conversion handled by #[from] attribute in enum definition

impl From<anyhow::Error> for VisionError {
    fn from(err: anyhow::Error) -> Self {
        VisionError::Other(err.to_string())
    }
}