use std::{
    array::TryFromSliceError, ffi::NulError, fmt, io, num::TryFromIntError, string::FromUtf8Error,
};

#[derive(Debug)]
pub enum Error {
    Int(TryFromIntError),
    Io(io::Error),
    Utf8(FromUtf8Error),
    Slice(TryFromSliceError),
    BadPath,
    InvalidChecksum,
    InvalidAlgorithm,
    InvalidMagic,
    MissingData,
    MutexError,
    NulError,
    SenderError,
    UnexpectedData,
    UnknownFileType,
    Other(String),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Int(e) => write!(f, "{e}"),
            Self::Utf8(e) => write!(f, "{e}"),
            Self::Slice(e) => write!(f, "{e}"),
            Self::Io(e) => write!(f, "{e}"),
            Self::BadPath => write!(f, "bad path"),
            Self::InvalidAlgorithm => write!(f, "invalid algorithm"),
            Self::InvalidChecksum => write!(f, "invalid checksum"),
            Self::InvalidMagic => write!(f, "invalid magic"),
            Self::MissingData => write!(f, "missing data"),
            Self::MutexError => write!(f, "mutex error"),
            Self::NulError => write!(f, "nul error"),
            Self::SenderError => write!(f, "sender error"),
            Self::UnexpectedData => write!(f, "unexpected data"),
            Self::UnknownFileType => write!(f, "unknown file type"),
            Self::Other(s) => write!(f, "{s}"),
        }
    }
}

impl std::error::Error for Error {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            Self::Int(e) => Some(e),
            Self::Io(e) => Some(e),
            Self::Utf8(e) => Some(e),
            Self::Slice(e) => Some(e),
            _ => None,
        }
    }
}

impl From<TryFromIntError> for Error {
    fn from(value: TryFromIntError) -> Self {
        Self::Int(value)
    }
}

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

impl From<FromUtf8Error> for Error {
    fn from(value: FromUtf8Error) -> Self {
        Self::Utf8(value)
    }
}

impl From<TryFromSliceError> for Error {
    fn from(value: TryFromSliceError) -> Self {
        Self::Slice(value)
    }
}

impl From<NulError> for Error {
    fn from(_value: NulError) -> Self {
        Self::NulError
    }
}