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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 rustc_hex::{FromHex, FromHexError, ToHex};
use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer};
use std::{ops, str};

#[derive(Debug, PartialEq)]
pub struct Bytes(Vec<u8>);

impl ops::Deref for Bytes {
    type Target = [u8];

    fn deref(&self) -> &Self::Target { &self.0 }
}

impl<'a> Deserialize<'a> for Bytes {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where D: Deserializer<'a> {
        let s = String::deserialize(deserializer)?;
        let data = s
            .from_hex()
            .map_err(|e| Error::custom(format!("Invalid hex value {}", e)))?;
        Ok(Bytes(data))
    }
}

impl Serialize for Bytes {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where S: Serializer {
        serializer.serialize_str(&self.0.to_hex::<String>())
    }
}

impl str::FromStr for Bytes {
    type Err = FromHexError;

    fn from_str(s: &str) -> Result<Self, Self::Err> { s.from_hex().map(Bytes) }
}

impl From<&'static str> for Bytes {
    fn from(s: &'static str) -> Self {
        s.parse().unwrap_or_else(|_| {
            panic!("invalid string literal for {}: '{}'", stringify!(Self), s)
        })
    }
}

impl From<Vec<u8>> for Bytes {
    fn from(v: Vec<u8>) -> Self { Bytes(v) }
}

impl From<Bytes> for Vec<u8> {
    fn from(b: Bytes) -> Self { b.0 }
}