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use std::fmt;

use failure::{Backtrace, Context, Fail};

/// The error kind for errors that get returned in the crate
#[derive(Eq, PartialEq, Debug, Fail)]
pub enum ErrorKind {
    #[fail(display = "failed to deserialize JSON")]
    JsonDeserializationFailed,
    #[fail(display = "failed to send request")]
    FailedToSendRequest,
    #[fail(display = "failed to read response")]
    FailedToReadResponse,
    #[fail(display = "failed to authenticate")]
    AuthenticationFailed,
    #[fail(display = "API call '{}' failed with code {} because {}", name, code, msg)]
    ApiCallFailed {
        name: &'static str,
        code: isize,
        msg: String,
    },
    #[fail(
        display = "API call '{}' failed for unknown reason with status code {}",
        name, status_code
    )]
    UnknownApiCallFailure { name: &'static str, status_code: u16 },
}

impl Clone for ErrorKind {
    fn clone(&self) -> Self {
        use self::ErrorKind::*;
        match *self {
            JsonDeserializationFailed => JsonDeserializationFailed,
            FailedToSendRequest => FailedToSendRequest,
            FailedToReadResponse => FailedToReadResponse,
            AuthenticationFailed => AuthenticationFailed,
            ApiCallFailed { name, code, ref msg } => ApiCallFailed {
                name,
                code,
                msg: msg.clone(),
            },
            UnknownApiCallFailure { name, status_code } => UnknownApiCallFailure { name, status_code },
        }
    }
}

/// The error type for errors that get returned in the lookup module
#[derive(Debug)]
pub struct Error {
    pub(crate) inner: Context<ErrorKind>,
}

impl Error {
    /// Get the kind of the error
    pub fn kind(&self) -> &ErrorKind {
        self.inner.get_context()
    }
}

impl Clone for Error {
    fn clone(&self) -> Self {
        Error {
            inner: Context::new(self.inner.get_context().clone()),
        }
    }
}

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

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