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// Copyright (C) 2019-2020 Aleo Systems Inc.
// This file is part of the snarkOS library.

// The snarkOS library 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.

// The snarkOS library 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 the snarkOS library. If not, see <https://www.gnu.org/licenses/>.

use std::fmt::Debug;

#[derive(Debug, Error)]
pub enum TransactionError {
    #[error("UTXO has already been spent {:?} index: {:?}", _0, _1)]
    AlreadySpent(Vec<u8>, u32),

    #[error("there is a double spend occuring with this transaction {}", _0)]
    DoubleSpend(String),

    #[error("{}: {}", _0, _1)]
    Crate(&'static str, String),

    #[error("insufficient funds from input: {} to spend as output: {}", _0, _1)]
    InsufficientFunds(u64, u64),

    #[error("invalid coinbase transaction")]
    InvalidCoinbaseTransaction,

    #[error("invalid transaction id {:?}", _0)]
    InvalidTransactionId(usize),

    #[error("invalid variable size integer: {:?}", _0)]
    InvalidVariableSizeInteger(usize),

    #[error("{}", _0)]
    Message(String),

    #[error("missing outpoint script public key")]
    MissingOutpointScriptPublicKey,

    #[error("the block has multiple coinbase transactions: {:?}", _0)]
    MultipleCoinbaseTransactions(u32),

    #[error("Null Error {:?}", _0)]
    NullError(()),
}

impl From<hex::FromHexError> for TransactionError {
    fn from(error: hex::FromHexError) -> Self {
        TransactionError::Crate("hex", format!("{:?}", error))
    }
}

impl From<std::io::Error> for TransactionError {
    fn from(error: std::io::Error) -> Self {
        TransactionError::Crate("std::io", format!("{:?}", error))
    }
}

impl From<std::num::ParseIntError> for TransactionError {
    fn from(error: std::num::ParseIntError) -> Self {
        TransactionError::Crate("std::num", format!("{:?}", error))
    }
}

impl From<std::str::ParseBoolError> for TransactionError {
    fn from(error: std::str::ParseBoolError) -> Self {
        TransactionError::Crate("std::str", format!("{:?}", error))
    }
}

impl From<()> for TransactionError {
    fn from(_error: ()) -> Self {
        TransactionError::NullError(())
    }
}

impl From<&'static str> for TransactionError {
    fn from(msg: &'static str) -> Self {
        TransactionError::Message(msg.into())
    }
}