// 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/>.

use super::Crypto;
use serde_json;
use std::io::{Read, Write};

/// Vault meta file
#[derive(Debug, PartialEq, Serialize, Deserialize)]
pub struct VaultFile {
    /// Vault password, encrypted with vault password
    pub crypto: Crypto,
    /// Vault metadata string
    pub meta: Option<String>,
}

impl VaultFile {
    pub fn load<R>(reader: R) -> Result<Self, serde_json::Error>
    where
        R: Read,
    {
        serde_json::from_reader(reader)
    }

    pub fn write<W>(&self, writer: &mut W) -> Result<(), serde_json::Error>
    where
        W: Write,
    {
        serde_json::to_writer(writer, self)
    }
}

#[cfg(test)]
mod test {
    use json::{Aes128Ctr, Cipher, Crypto, Kdf, Pbkdf2, Prf, VaultFile};
    use serde_json;
    use std::num::NonZeroU32;

    lazy_static! {
        static ref ITERATIONS: NonZeroU32 = NonZeroU32::new(1024).expect("1024 > 0; qed");
    }

    #[test]
    fn to_and_from_json() {
        let file = VaultFile {
            crypto: Crypto {
                cipher: Cipher::Aes128Ctr(Aes128Ctr {
                    iv: "0155e3690be19fbfbecabcd440aa284b".into(),
                }),
                ciphertext: "4d6938a1f49b7782".into(),
                kdf: Kdf::Pbkdf2(Pbkdf2 {
                    c: *ITERATIONS,
                    dklen: 32,
                    prf: Prf::HmacSha256,
                    salt: "b6a9338a7ccd39288a86dba73bfecd9101b4f3db9c9830e7c76afdbd4f6872e5".into(),
                }),
                mac: "16381463ea11c6eb2239a9f339c2e780516d29d234ce30ac5f166f9080b5a262".into(),
            },
            meta: Some("{}".into()),
        };

        let serialized = serde_json::to_string(&file).unwrap();
        let deserialized = serde_json::from_str(&serialized).unwrap();

        assert_eq!(file, deserialized);
    }

    #[test]
    fn to_and_from_json_no_meta() {
        let file = VaultFile {
            crypto: Crypto {
                cipher: Cipher::Aes128Ctr(Aes128Ctr {
                    iv: "0155e3690be19fbfbecabcd440aa284b".into(),
                }),
                ciphertext: "4d6938a1f49b7782".into(),
                kdf: Kdf::Pbkdf2(Pbkdf2 {
                    c: *ITERATIONS,
                    dklen: 32,
                    prf: Prf::HmacSha256,
                    salt: "b6a9338a7ccd39288a86dba73bfecd9101b4f3db9c9830e7c76afdbd4f6872e5".into(),
                }),
                mac: "16381463ea11c6eb2239a9f339c2e780516d29d234ce30ac5f166f9080b5a262".into(),
            },
            meta: None,
        };

        let serialized = serde_json::to_string(&file).unwrap();
        let deserialized = serde_json::from_str(&serialized).unwrap();

        assert_eq!(file, deserialized);
    }
}