/*
Copyright 2020 Brandon Lucia <blucia@gmail.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.
*/

extern crate rand;
use rand::Rng;

extern crate raphy;
use raphy::csr::CSR;

#[test]
fn test_bfs(){

  let mut rng = rand::thread_rng();
  let mut el = Vec::new();
 
  const NUMV: usize = 10;

  const MAX_E: usize = 4;

  for i in 0..NUMV { 

    /*edges per vertex*/
    let num_e: usize = rng.gen_range(0,MAX_E) as usize;
    for _ in 0..num_e{
  
      let edge = (i as usize, rng.gen_range(0,NUMV) as usize);

      el.push(edge);

    }

  }

  let nume = el.len();  
  let csr = CSR::new(NUMV,el);

  let mut edge_cnt = 0;
  csr.read_only_scan( |_v0,_v1| {edge_cnt = edge_cnt + 1; });
  assert_eq!(edge_cnt, nume);
 
  let bfs_vtxs = &mut Vec::new();
  let start_v: usize = rng.gen_range(0,NUMV) as usize;
  csr.bfs_traversal(start_v, |v| { bfs_vtxs.push(v); });

  /*Check that the traversal saw at most NUMV vertices*/
  assert!(bfs_vtxs.len() <= NUMV);

  /*Check that the traversal did not report any vertex id that is too high*/
  assert!(bfs_vtxs.iter().filter(|&v| { *v >= NUMV }).collect::< Vec::<&usize> >().len() == 0);

  

}
