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// The MIT License (MIT)
//
// Copyright (c) 2017 Doublify Technologies
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

use block::Block;

/// Chain of the blocks.
#[derive(Debug)]
pub struct Chain {
  chain: Vec<Block>,
}

impl Default for Chain {
  fn default() -> Chain {
    Chain { chain: vec![] }
  }
}

impl Chain {
  /// Returns true if the given chain is trusty.
  pub fn is_trusty_chain(&self) -> bool {
    self.chain.windows(2).all(|v| v[1].is_trusty_for(&v[0]))
  }
}

#[test]
fn is_trusty_chain() {
  let block0 = Block::new(0, vec![], 0);
  let block1 = block0.next(vec![]);
  let block2 = block1.next(vec![]);
  let block3 = block2.next(vec![]);

  let chain = Chain { chain: vec![block0, block1, block2, block3] };

  assert!(chain.is_trusty_chain())
}