use mineswipe::grid::{State, Grid};

#[test]
fn first_move() {
  let (rows, columns, mines) = (9, 6, 20);
  let mut grid = Grid::new(rows, columns, mines).unwrap();

  println!("{:?}", grid);

  assert_eq!(grid.state, State::Start);

  let start_index = rows*(columns-1);
  
  grid.dig(start_index).unwrap();
  
  println!("{:?}", grid);

  assert!(no_mines(&grid, &grid.cells[start_index].neighbours(rows, columns)));
  assert!(!grid.cells[start_index].mine);
  assert_eq!(grid.state, State::Ongoing); 
}

#[test]
fn dig_twice() {
  let (rows, columns, mines) = (9, 6, 20);
  let mut grid = Grid::new(rows, columns, mines).unwrap();
  let index = rows*(columns-1);

  grid.dig(index).unwrap();
  assert!(no_mines(&grid, &grid.cells[index].neighbours(rows, columns)));

  let result = grid.dig(index);

  assert!(result.is_err());
}

#[test]
fn illegal_index() {
  let (rows, columns, mines) = (9, 6, 20);
  let mut grid = Grid::new(rows, columns, mines).unwrap();
  let index = rows*columns;
  
  let result = grid.dig(index);
  assert!(result.is_err());
}

#[test]
fn illegal_grids() {
  let (rows1, columns1, mines1) = (1, 7, 2);
  let (rows2, columns2, mines2) = (7, 1, 2);

  let grid1 = Grid::new(rows1, columns1, mines1);
  let grid2 = Grid::new(rows2, columns2, mines2);

  assert!(grid1.is_err() && grid2.is_err());
}

/// Checks if all the given cells are not mines.
fn no_mines(grid: &Grid, cells: &Vec<usize>) -> bool {
  cells.iter().all(|index| !grid.cells[index.clone()].mine)
}