// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity Ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

use derive_more::Display;
use ethcore::error::{Error as EthcoreError, ExecutionError};
use ethereum_types::Address;
use ethkey::{crypto::Error as CryptoError, Error as KeyError};
use ethtrie::TrieError;
use private_transactions::VerifiedPrivateTransaction;
use rlp::DecoderError;
use std::error;
use txpool::VerifiedTransaction;
use types::transaction::Error as TransactionError;

type TxPoolError = txpool::Error<<VerifiedPrivateTransaction as VerifiedTransaction>::Hash>;

#[derive(Debug, Display)]
pub enum Error {
    /// Error concerning the Rust standard library's IO subsystem.
    #[display(fmt = "Io Error: {}", _0)]
    Io(::std::io::Error),
    /// RLP decoding error.
    #[display(fmt = "Decoder Error: {}", _0)]
    Decoder(DecoderError),
    /// Error concerning TrieDBs.
    #[display(fmt = "Trie Error: {}", _0)]
    Trie(TrieError),
    /// Transaction pool error.
    #[display(fmt = "Transaction Pool Error: {}", _0)]
    TxPool(TxPoolError),
    /// Crypto error.
    #[display(fmt = "Crypto Error {}", _0)]
    Crypto(CryptoError),
    /// Encryption error.
    #[display(fmt = "Encryption error. ({})", _0)]
    Encrypt(String),
    /// Decryption error.
    #[display(fmt = "Decryption error. ({})", _0)]
    Decrypt(String),
    /// Address not authorized.
    #[display(fmt = "Private transaction execution is not authorised for {}", _0)]
    NotAuthorised(Address),
    /// Transaction creates more than one contract.
    #[display(fmt = "Private transaction created too many contracts")]
    TooManyContracts,
    /// Contract call error.
    #[display(fmt = "Contract call error. ({})", _0)]
    Call(String),
    /// State is not available.
    #[display(fmt = "State is not available")]
    StatePruned,
    /// State is incorrect.
    #[display(fmt = "State is incorrect")]
    StateIncorrect,
    /// Wrong private transaction type.
    #[display(fmt = "Wrong private transaction type")]
    BadTransactionType,
    /// Contract does not exist or was not created.
    #[display(fmt = "Contract does not exist or was not created")]
    ContractDoesNotExist,
    /// Reference to the client is corrupted.
    #[display(fmt = "Reference to the client is corrupted")]
    ClientIsMalformed,
    /// Queue of private transactions for verification is full.
    #[display(fmt = "Queue of private transactions for verification is full")]
    QueueIsFull,
    /// The transaction already exists in queue of private transactions.
    #[display(fmt = "The transaction already exists in queue of private transactions.")]
    PrivateTransactionAlreadyImported,
    /// The information about private transaction is not found in the store.
    #[display(fmt = "The information about private transaction is not found in the store.")]
    PrivateTransactionNotFound,
    /// Account for signing public transactions not set.
    #[display(fmt = "Account for signing public transactions not set.")]
    SignerAccountNotSet,
    /// Account for validating private transactions not set.
    #[display(fmt = "Account for validating private transactions not set.")]
    ValidatorAccountNotSet,
    /// Account for signing requests to key server not set.
    #[display(fmt = "Account for signing requests to key server not set.")]
    KeyServerAccountNotSet,
    /// Encryption key is not found on key server.
    #[display(fmt = "Encryption key is not found on key server for {}", _0)]
    EncryptionKeyNotFound(Address),
    /// Key server URL is not set.
    #[display(fmt = "Key server URL is not set.")]
    KeyServerNotSet,
    /// VM execution error.
    #[display(fmt = "VM execution error {}", _0)]
    Execution(ExecutionError),
    /// General signing error.
    #[display(fmt = "General signing error {}", _0)]
    Key(KeyError),
    /// Error of transactions processing.
    #[display(fmt = "Error of transactions processing {}", _0)]
    Transaction(TransactionError),
    /// General ethcore error.
    #[display(fmt = "General ethcore error {}", _0)]
    Ethcore(EthcoreError),
    /// A convenient variant for String.
    #[display(fmt = "{}", _0)]
    Msg(String),
}

impl error::Error for Error {
    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
        match self {
            Error::Io(e) => Some(e),
            Error::Decoder(e) => Some(e),
            Error::Trie(e) => Some(e),
            Error::TxPool(e) => Some(e),
            Error::Crypto(e) => Some(e),
            Error::Execution(e) => Some(e),
            Error::Key(e) => Some(e),
            Error::Transaction(e) => Some(e),
            Error::Ethcore(e) => Some(e),
            _ => None,
        }
    }
}

impl From<String> for Error {
    fn from(s: String) -> Self {
        Error::Msg(s)
    }
}

impl From<std::io::Error> for Error {
    fn from(err: std::io::Error) -> Self {
        Error::Io(err).into()
    }
}

impl From<KeyError> for Error {
    fn from(err: KeyError) -> Self {
        Error::Key(err).into()
    }
}

impl From<CryptoError> for Error {
    fn from(err: CryptoError) -> Self {
        Error::Crypto(err).into()
    }
}

impl From<DecoderError> for Error {
    fn from(err: DecoderError) -> Self {
        Error::Decoder(err).into()
    }
}

impl From<ExecutionError> for Error {
    fn from(err: ExecutionError) -> Self {
        Error::Execution(err).into()
    }
}

impl From<TransactionError> for Error {
    fn from(err: TransactionError) -> Self {
        Error::Transaction(err).into()
    }
}

impl From<TrieError> for Error {
    fn from(err: TrieError) -> Self {
        Error::Trie(err).into()
    }
}

impl From<TxPoolError> for Error {
    fn from(err: TxPoolError) -> Self {
        Error::TxPool(err).into()
    }
}

impl From<EthcoreError> for Error {
    fn from(err: EthcoreError) -> Self {
        Error::Ethcore(err).into()
    }
}

impl<E> From<Box<E>> for Error
where
    Error: From<E>,
{
    fn from(err: Box<E>) -> Error {
        Error::from(*err)
    }
}