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/*
 * Copyright (C) 2015 Benjamin Fry <benjaminfry@me.com>
 *
 * 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.
 */

//! IPv6 address record data
//!
//! [RFC 3596, DNS Extensions to Support IPv6, October 2003](https://tools.ietf.org/html/rfc3596)
//!
//! ```text
//! 2.1 AAAA record type
//!
//!   The AAAA resource record type is a record specific to the Internet
//!   class that stores a single IPv6 address.
//!
//!   The IANA assigned value of the type is 28 (decimal).
//!
//! 2.2 AAAA data format
//!
//!   A 128 bit IPv6 address is encoded in the data portion of an AAAA
//!   resource record in network byte order (high-order byte first).
//! ```

use std::net::Ipv6Addr;

use ::serialize::txt::*;
use ::serialize::binary::*;
use ::error::*;

//
// AAAA { address: Ipv6Addr }
pub fn read(decoder: &mut BinDecoder) -> DecodeResult<Ipv6Addr> {
  let a: u16 = try!(decoder.read_u16());
  let b: u16 = try!(decoder.read_u16());
  let c: u16 = try!(decoder.read_u16());
  let d: u16 = try!(decoder.read_u16());
  let e: u16 = try!(decoder.read_u16());
  let f: u16 = try!(decoder.read_u16());
  let g: u16 = try!(decoder.read_u16());
  let h: u16 = try!(decoder.read_u16());

  Ok(Ipv6Addr::new(a,b,c,d,e,f,g,h))
}

pub fn emit(encoder: &mut BinEncoder, address: &Ipv6Addr) -> EncodeResult {
  let segments = address.segments();

  try!(encoder.emit_u16(segments[0]));
  try!(encoder.emit_u16(segments[1]));
  try!(encoder.emit_u16(segments[2]));
  try!(encoder.emit_u16(segments[3]));
  try!(encoder.emit_u16(segments[4]));
  try!(encoder.emit_u16(segments[5]));
  try!(encoder.emit_u16(segments[6]));
  try!(encoder.emit_u16(segments[7]));
  Ok(())
}

pub fn parse(tokens: &Vec<Token>) -> ParseResult<Ipv6Addr> {
  let mut token = tokens.iter();

  let address: Ipv6Addr = try!(token.next().ok_or(ParseError::MissingToken("ipv6 address".to_string())).and_then(|t| if let &Token::CharData(ref s) = t {Ok(try!(s.parse()))} else {Err(ParseError::UnexpectedToken(t.clone()))} ));
  Ok(address)
}


#[cfg(test)]
mod tests {
  use std::net::Ipv6Addr;
  use std::str::FromStr;

  use super::*;
  use ::serialize::binary::bin_tests::{test_read_data_set, test_emit_data_set};

  fn get_data() -> Vec<(Ipv6Addr, Vec<u8>)> {
    vec![
    (Ipv6Addr::from_str("::").unwrap(), vec![0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0]), // base case
    (Ipv6Addr::from_str("1::").unwrap(), vec![0,1,0,0,0,0,0,0, 0,0,0,0,0,0,0,0]),
    (Ipv6Addr::from_str("0:1::").unwrap(), vec![0,0,0,1,0,0,0,0, 0,0,0,0,0,0,0,0]),
    (Ipv6Addr::from_str("0:0:1::").unwrap(), vec![0,0,0,0,0,1,0,0, 0,0,0,0,0,0,0,0]),
    (Ipv6Addr::from_str("0:0:0:1::").unwrap(), vec![0,0,0,0,0,0,0,1, 0,0,0,0,0,0,0,0]),
    (Ipv6Addr::from_str("::1:0:0:0").unwrap(), vec![0,0,0,0,0,0,0,0, 0,1,0,0,0,0,0,0]),
    (Ipv6Addr::from_str("::1:0:0").unwrap(), vec![0,0,0,0,0,0,0,0, 0,0,0,1,0,0,0,0]),
    (Ipv6Addr::from_str("::1:0").unwrap(), vec![0,0,0,0,0,0,0,0, 0,0,0,0,0,1,0,0]),
    (Ipv6Addr::from_str("::1").unwrap(), vec![0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,1]),
    (Ipv6Addr::from_str("::127.0.0.1").unwrap(), vec![0,0,0,0,0,0,0,0, 0,0,0,0,127,0,0,1]),
    (Ipv6Addr::from_str("FF00::192.168.64.32").unwrap(), vec![255,0,0,0,0,0,0,0, 0,0,0,0,192,168,64,32]),
    ]
  }

  #[test]
  fn test_read() {
    test_read_data_set(get_data(), |ref mut d| read(d));
  }

  #[test]
  fn test_emit() {
    test_emit_data_set(get_data(), |e,d| emit(e,&d));
  }
}