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use failure::{Backtrace, Context, Fail};
#[cfg(feature = "reqwest")]
use std::{fmt, io, num};
use {ommui_file_loading, reqwest, uuid};

#[derive(Debug)]
pub struct Error {
    inner: Context<ErrorKind>,
}

impl Fail for Error {
    fn cause(&self) -> Option<&Fail> {
        self.inner.cause()
    }

    fn backtrace(&self) -> Option<&Backtrace> {
        self.inner.backtrace()
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Display::fmt(&self.inner, f)
    }
}

impl Error {
    pub fn kind(&self) -> ErrorKind {
        (*self.inner.get_context()).clone()
    }
}

impl From<ErrorKind> for Error {
    fn from(kind: ErrorKind) -> Error {
        Error {
            inner: Context::new(kind),
        }
    }
}

impl From<Context<ErrorKind>> for Error {
    fn from(inner: Context<ErrorKind>) -> Error {
        Error { inner }
    }
}

#[derive(Clone, Eq, PartialEq, Debug, Fail)]
pub enum ErrorKind {
    #[fail(display = "item '{}' of kind '{}' not found", id, kind)]
    NotFound { kind: &'static str, id: String },
    #[fail(display = "uuid parse")]
    UuidParse,
    #[fail(display = "reqwest")]
    Reqwest,
    #[fail(display = "io")]
    Io,
    #[fail(display = "parse int")]
    ParseInt,
    #[fail(display = "ommui file loading")]
    OmmuiFileLoading,
}

impl From<uuid::parser::ParseError> for Error {
    fn from(e: uuid::parser::ParseError) -> Error {
        e.context(ErrorKind::UuidParse).into()
    }
}

impl From<io::Error> for Error {
    fn from(e: io::Error) -> Error {
        e.context(ErrorKind::Io).into()
    }
}

impl From<num::ParseIntError> for Error {
    fn from(e: num::ParseIntError) -> Error {
        e.context(ErrorKind::ParseInt).into()
    }
}

#[cfg(feature = "reqwest")]
impl From<reqwest::Error> for Error {
    fn from(e: reqwest::Error) -> Error {
        e.context(ErrorKind::Reqwest).into()
    }
}

impl From<ommui_file_loading::Error> for Error {
    fn from(e: ommui_file_loading::Error) -> Error {
        e.context(ErrorKind::OmmuiFileLoading).into()
    }
}