package kata.gameoflife.a20170806;

import java.util.List;

/**
  * Game of Life Kata.
  * Copyright (c) 2017, Peter Kofler, licensed under BSD License.
  */
public class CountLivingNeighbourCells {

    private final LocateNeighbourCells locateNeighbourCells;
    private final LookupLivingCells lookupLivingCells;

    public CountLivingNeighbourCells(LocateNeighbourCells locateNeighbourCells, LookupLivingCells lookupLivingCells) {
        this.locateNeighbourCells = locateNeighbourCells;
        this.lookupLivingCells = lookupLivingCells;
    }

    public int count() {
        List<LocateCell> neighbourCells = locateNeighbourCells.locateNeighbourCells();
        return (int) neighbourCells.stream(). //
                filter(lookupLivingCells::isAlive). //
                count();
    }

    // calculateSurroundingCoordinates is the function we are interested. In this case
    // it is a pain that we also close over the (x,y) because now each CountingNeighbours
    // has a CalculateSurroundingCoordinates in its constructor. On the other hand, with
    // the long but exact name, it kind of looks good.
}