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// Copyright 2019 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

//! Errors during identity key operations.

use std::error::Error;
use std::fmt;

/// An error during decoding of key material.
#[derive(Debug)]
pub struct DecodingError {
    msg: String,
    source: Option<Box<dyn Error + Send + Sync>>,
}

impl DecodingError {
    pub(crate) fn new<S: ToString>(msg: S) -> Self {
        Self {
            msg: msg.to_string(),
            source: None,
        }
    }

    pub(crate) fn source(self, source: impl Error + Send + Sync + 'static) -> Self {
        Self {
            source: Some(Box::new(source)),
            ..self
        }
    }
}

impl fmt::Display for DecodingError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Key decoding error: {}", self.msg)
    }
}

impl Error for DecodingError {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        self.source.as_ref().map(|s| &**s as &dyn Error)
    }
}

/// An error during signing of a message.
#[derive(Debug)]
pub struct SigningError {
    msg: String,
    source: Option<Box<dyn Error + Send + Sync>>,
}

/// An error during encoding of key material.
impl SigningError {
    pub(crate) fn new<S: ToString>(msg: S) -> Self {
        Self {
            msg: msg.to_string(),
            source: None,
        }
    }

    pub(crate) fn source(self, source: impl Error + Send + Sync + 'static) -> Self {
        Self {
            source: Some(Box::new(source)),
            ..self
        }
    }
}

impl fmt::Display for SigningError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Key signing error: {}", self.msg)
    }
}

impl Error for SigningError {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        self.source.as_ref().map(|s| &**s as &dyn Error)
    }
}