// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum 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.

// OpenEthereum 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 OpenEthereum.  If not, see <http://www.gnu.org/licenses/>.

//! EIP-191 specific types

use ethereum_types::H160;
use serde::{de, Deserialize, Deserializer};
use v1::types::Bytes;

/// EIP-191 version specifier
#[derive(Debug)]
pub enum EIP191Version {
    /// byte specifier for structured data (0x01)
    StructuredData,
    /// byte specifier for personal message (0x45)
    PersonalMessage,
    /// byte specifier for presignedtransaction (0x00)
    PresignedTransaction,
}

/// EIP-191 version 0x0 struct
#[derive(Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct PresignedTransaction {
    // address of intended validator
    pub validator: H160,
    // application specific data
    pub data: Bytes,
}

impl<'de> Deserialize<'de> for EIP191Version {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        let byte_version = match s.as_str() {
            "0x00" => EIP191Version::PresignedTransaction,
            "0x01" => EIP191Version::StructuredData,
            "0x45" => EIP191Version::PersonalMessage,
            other => {
                return Err(de::Error::custom(format!(
                    "Invalid byte version '{}'",
                    other
                )))
            }
        };
        Ok(byte_version)
    }
}
