// Copyright 2015 Till Höppner
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::io::{ BufRead, Write };
use std::iter::Iterator;

use log::Event;
use format::{ Encode, Decode };

use bincode::{ self, SizeLimit };

pub struct Binary;

pub struct Iter<R> where R: BufRead {
    input: R
}

impl<R> Iterator for Iter<R> where R: BufRead {
    type Item = ::Result<Event>;
    fn next(&mut self) -> Option<::Result<Event>> {
        Some(bincode::decode_from::<R, Event>(&mut self.input, SizeLimit::Infinite)
             .map_err(|_| ::IlcError::BincodeDecode))
    }
}

impl<W> Encode<W> for Binary where W: Write {
    fn encode(&self, mut output: W, event: &Event) -> ::Result<()> {
        bincode::encode_into(event, &mut output, SizeLimit::Infinite)
            .map_err(|_| ::IlcError::BincodeEncode)
    }
}

impl<R> Decode<R, Iter<R>> for Binary where R: BufRead {
    fn decode(&mut self, input: R) -> Iter<R> {
        Iter { input: input }
    }
}