// SPDX-License-Identifier: GPL-3.0-or-later
// src/error.rs
//
// Central error and result types for Noctua.

use std::fmt;

pub type Result<T> = std::result::Result<T, Error>;

#[derive(Debug)]
pub enum Error {
    /// A requested file or resource was not found.
    NotFound(String),
    /// The file format or operation is not supported.
    Unsupported(String),
    /// A session could not be loaded or saved.
    Session(String),
    /// An underlying I/O error.
    Io(std::io::Error),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Error::NotFound(msg) => write!(f, "Not found: {msg}"),
            Error::Unsupported(msg) => write!(f, "Unsupported: {msg}"),
            Error::Session(msg) => write!(f, "Session error: {msg}"),
            Error::Io(err) => write!(f, "I/O error: {err}"),
        }
    }
}

impl std::error::Error for Error {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            Error::Io(err) => Some(err),
            _ => None,
        }
    }
}

impl From<std::io::Error> for Error {
    fn from(err: std::io::Error) -> Self {
        Error::Io(err)
    }
}