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use std::error::Error;
use std::{fmt, io};

/// Error while reading data.

#[derive(Debug)]
pub enum ReadError {
    IoError(io::Error),
    ParseError(ParseError),
}

impl Error for ReadError {}

impl fmt::Display for ReadError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match &self {
            ReadError::IoError(e) => write!(f, "Input error: {}", e),
            ReadError::ParseError(e) => write!(f, "Parse error: {}", e),
        }
    }
}

impl From<io::Error> for ReadError {
    fn from(e: io::Error) -> Self {
        Self::IoError(e)
    }
}

impl From<ParseError> for ReadError {
    fn from(e: ParseError) -> Self {
        Self::ParseError(e)
    }
}

/// Error, that happend when data doesn't satisfy expected parameters.

#[derive(Debug)]
pub enum ParseError {
    /// Unexpected texture identifier.

    BadIdentifier([u8; 12]),
    /// Specified format is not supported.

    BadFormat(u32),
    /// Type size of texture is zero.

    ZeroTypeSize,
    /// Width of texture is zero.

    ZeroWidth,
    /// Face count of texture is zero.

    ZeroFaceCount,
    /// Found unsupported feature.

    UnsupportedFeature(&'static str),
}

impl Error for ParseError {}

impl fmt::Display for ParseError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match &self {
            ParseError::BadIdentifier(id) => write!(f, "Identifier is wrong: {:?}", id),
            ParseError::BadFormat(i) => write!(f, "Unsoperted format: {:?}", i),
            ParseError::ZeroTypeSize => write!(f, "Type size is zero"),
            ParseError::ZeroWidth => write!(f, "Width is zero"),
            ParseError::ZeroFaceCount => write!(f, "Face count is zero"),
            ParseError::UnsupportedFeature(name) => write!(f, "Loader doesn't support: {}", name),
        }
    }
}

/// Error, that happened when reader can't read data to client's buffer.

#[derive(Debug)]
pub enum ReadToError {
    ReadError(ReadError),
    BadBuffer(u64),
}

impl Error for ReadToError {}

impl fmt::Display for ReadToError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match &self {
            Self::ReadError(e) => e.fmt(f),
            Self::BadBuffer(expect_size) => {
                write!(f, "Wrong buffer size. Expected: {:?}", expect_size)
            }
        }
    }
}

impl From<ReadError> for ReadToError {
    fn from(e: ReadError) -> Self {
        Self::ReadError(e)
    }
}

impl From<io::Error> for ReadToError {
    fn from(e: io::Error) -> Self {
        ReadError::IoError(e).into()
    }
}