use gif::DecodingError;
use png_pong::decode::Error as PngError;
use std::error::Error;
use std::fmt;

#[derive(Debug)]
pub enum AnimeError {
    NoFrames,
    Io(std::io::Error),
    Png(PngError),
    Gif(DecodingError),
    Format,
    /// The input was incorrect size, expected size is `IncorrectSize(width, height)`
    IncorrectSize(u32, u32),
    Dbus(String),
}

impl fmt::Display for AnimeError {
    #[inline]
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            AnimeError::NoFrames => write!(f, "No frames in PNG"),
            AnimeError::Io(e) => write!(f, "Could not open: {}", e),
            AnimeError::Png(e) => write!(f, "PNG error: {}", e),
            AnimeError::Gif(e) => write!(f, "GIF error: {}", e),
            AnimeError::Format => write!(f, "PNG file is not 8bit greyscale"),
            AnimeError::IncorrectSize(width, height) => write!(
                f,
                "The input image size is incorrect, expected {}x{}",
                width, height
            ),
            AnimeError::Dbus(detail) => write!(f, "{}", detail),
        }
    }
}

impl Error for AnimeError {}

impl From<std::io::Error> for AnimeError {
    #[inline]
    fn from(err: std::io::Error) -> Self {
        AnimeError::Io(err)
    }
}

impl From<PngError> for AnimeError {
    #[inline]
    fn from(err: PngError) -> Self {
        AnimeError::Png(err)
    }
}

impl From<DecodingError> for AnimeError {
    #[inline]
    fn from(err: DecodingError) -> Self {
        AnimeError::Gif(err)
    }
}