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// 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 super::{Error, H128};
use serde::{
    de::{Error as SerdeError, Visitor},
    Deserialize, Deserializer, Serialize, Serializer,
};
use std::fmt;

#[derive(Debug, PartialEq)]
pub enum CipherSer {
    Aes128Ctr,
}

impl Serialize for CipherSer {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where S: Serializer {
        match *self {
            CipherSer::Aes128Ctr => serializer.serialize_str("aes-128-ctr"),
        }
    }
}

impl<'a> Deserialize<'a> for CipherSer {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where D: Deserializer<'a> {
        deserializer.deserialize_any(CipherSerVisitor)
    }
}

struct CipherSerVisitor;

impl<'a> Visitor<'a> for CipherSerVisitor {
    type Value = CipherSer;

    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        write!(formatter, "a valid cipher identifier")
    }

    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
    where E: SerdeError {
        match value {
            "aes-128-ctr" => Ok(CipherSer::Aes128Ctr),
            _ => Err(SerdeError::custom(Error::UnsupportedCipher)),
        }
    }

    fn visit_string<E>(self, value: String) -> Result<Self::Value, E>
    where E: SerdeError {
        self.visit_str(value.as_ref())
    }
}

#[derive(Debug, PartialEq, Serialize, Deserialize)]
pub struct Aes128Ctr {
    pub iv: H128,
}

#[derive(Debug, PartialEq)]
pub enum CipherSerParams {
    Aes128Ctr(Aes128Ctr),
}

impl Serialize for CipherSerParams {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where S: Serializer {
        match *self {
            CipherSerParams::Aes128Ctr(ref params) => {
                params.serialize(serializer)
            }
        }
    }
}

impl<'a> Deserialize<'a> for CipherSerParams {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where D: Deserializer<'a> {
        Aes128Ctr::deserialize(deserializer)
            .map(CipherSerParams::Aes128Ctr)
            .map_err(|_| Error::InvalidCipherParams)
            .map_err(SerdeError::custom)
    }
}

#[derive(Debug, PartialEq)]
pub enum Cipher {
    Aes128Ctr(Aes128Ctr),
}