// 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 json;
use std::num::NonZeroU32;

#[derive(Debug, PartialEq, Clone)]
pub enum Prf {
    HmacSha256,
}

#[derive(Debug, PartialEq, Clone)]
pub struct Pbkdf2 {
    pub c: NonZeroU32,
    pub dklen: u32,
    pub prf: Prf,
    pub salt: Vec<u8>,
}

#[derive(Debug, PartialEq, Clone)]
pub struct Scrypt {
    pub dklen: u32,
    pub p: u32,
    pub n: u32,
    pub r: u32,
    pub salt: Vec<u8>,
}

#[derive(Debug, PartialEq, Clone)]
pub enum Kdf {
    Pbkdf2(Pbkdf2),
    Scrypt(Scrypt),
}

impl From<json::Prf> for Prf {
    fn from(json: json::Prf) -> Self {
        match json {
            json::Prf::HmacSha256 => Prf::HmacSha256,
        }
    }
}

impl Into<json::Prf> for Prf {
    fn into(self) -> json::Prf {
        match self {
            Prf::HmacSha256 => json::Prf::HmacSha256,
        }
    }
}

impl From<json::Pbkdf2> for Pbkdf2 {
    fn from(json: json::Pbkdf2) -> Self {
        Pbkdf2 {
            c: json.c,
            dklen: json.dklen,
            prf: From::from(json.prf),
            salt: json.salt.into(),
        }
    }
}

impl Into<json::Pbkdf2> for Pbkdf2 {
    fn into(self) -> json::Pbkdf2 {
        json::Pbkdf2 {
            c: self.c,
            dklen: self.dklen,
            prf: self.prf.into(),
            salt: From::from(self.salt),
        }
    }
}

impl From<json::Scrypt> for Scrypt {
    fn from(json: json::Scrypt) -> Self {
        Scrypt {
            dklen: json.dklen,
            p: json.p,
            n: json.n,
            r: json.r,
            salt: json.salt.into(),
        }
    }
}

impl Into<json::Scrypt> for Scrypt {
    fn into(self) -> json::Scrypt {
        json::Scrypt {
            dklen: self.dklen,
            p: self.p,
            n: self.n,
            r: self.r,
            salt: From::from(self.salt),
        }
    }
}

impl From<json::Kdf> for Kdf {
    fn from(json: json::Kdf) -> Self {
        match json {
            json::Kdf::Pbkdf2(params) => Kdf::Pbkdf2(From::from(params)),
            json::Kdf::Scrypt(params) => Kdf::Scrypt(From::from(params)),
        }
    }
}

impl Into<json::Kdf> for Kdf {
    fn into(self) -> json::Kdf {
        match self {
            Kdf::Pbkdf2(params) => json::Kdf::Pbkdf2(params.into()),
            Kdf::Scrypt(params) => json::Kdf::Scrypt(params.into()),
        }
    }
}
