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//
// Copyright 2018-2019 Tamas Blummer
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//!
//! # Error type
//!
//!

use std::{fmt, io, sync};

/// Errors returned by this library
pub enum Error {
    /// pref is invalid (> 2^48)
    InvalidOffset,
    /// corrupted data
    Corrupted(String),
    /// key too long
    KeyTooLong,
    /// wrapped IO error
    IO(io::Error),
    /// Lock poisoned
    Poisoned(String),
    /// Queue error
    Queue(String),
    /// Bitcoin encoding error.
    #[cfg(feature = "bitcoin_support")]
    BitcoinDecode(bitcoin::consensus::encode::Error),
}

impl std::error::Error for Error {
    fn description(&self) -> &str {
        "description() is deprecated; use Display"
    }

    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match *self {
            Error::InvalidOffset => None,
            Error::KeyTooLong => None,
            Error::Corrupted(_) => None,
            Error::IO(ref e) => Some(e),
            Error::Poisoned(_) => None,
            Error::Queue(_) => None,
            #[cfg(feature = "bitcoin_support")]
            Error::BitcoinDecode(ref e) => Some(e),
        }
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match &self {
            Error::InvalidOffset => write!(f, "invalid pref"),
            Error::KeyTooLong => write!(f, "key too long"),
            Error::Corrupted(ref s) => write!(f, "corrupted data: {}", s),
            Error::IO(e) => e.fmt(f),
            Error::Poisoned(ref s) => write!(f, "lock poisoned: {}", s),
            Error::Queue(ref s) => write!(f, "queue error {}", s),
            #[cfg(feature = "bitcoin_support")]
            Error::BitcoinDecode(e) => write!(f, "bitcoin parsing error: {}", e),
        }
    }
}

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

impl From<io::Error> for Error {
    fn from(err: io::Error) -> Error {
        Error::IO(err)
    }
}

impl From<Error> for io::Error {
    fn from(_: Error) -> io::Error {
        io::Error::from(io::ErrorKind::UnexpectedEof)
    }
}

impl<T> From<sync::PoisonError<T>> for Error {
    fn from(err: sync::PoisonError<T>) -> Error {
        Error::Poisoned(err.to_string())
    }
}

impl<T> From<sync::mpsc::SendError<T>> for Error {
    fn from(err: sync::mpsc::SendError<T>) -> Error {
        Error::Queue(err.to_string())
    }
}

#[cfg(feature = "bitcoin_support")]
impl From<bitcoin::consensus::encode::Error> for Error {
    fn from(e: bitcoin::consensus::encode::Error) -> Error {
        Error::BitcoinDecode(e)
    }
}