import { world_update } from '../world/world.js';
import { lattice_rules } from './lattice_rules.js';


function apply(f, n, x0) {
  if (n == 0) {
    return x0;
  } else {
    return f(apply(f, n-1, x0));
  }
}


test("blinker", () => {
  const L = { type: 'active', flags: {} };
  const _ = { type: 'empty', flags: {} };
  const l = { type: 'active', flags: { emit: [0, 0, 0, 0, 0, 0, 0, 1] } };
  const d = { type: 'empty', flags: { emit: [0, 0, 0, 0, 0, 0, 0, -1] } };
  const lattice = [
    [ _, _, _, _, _ ],
    [ _, _, _, _, _ ],
    [ _, L, L, L, _ ],
    [ _, _, _, _, _ ],
    [ _, _, _, _, _ ],
  ];

  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [], validity: [] };
  expect(world_update(world).lattice).toEqual([
    [ _, _, _, _, _ ],
    [ _, _, l, _, _ ],
    [ _, d, L, d, _ ],
    [ _, _, l, _, _ ],
    [ _, _, _, _, _ ],
  ]);
  expect(world_update(world_update(world)).lattice).toEqual([
    [ _, _, _, _, _ ],
    [ _, _, d, _, _ ],
    [ _, l, L, l, _ ],
    [ _, _, d, _, _ ],
    [ _, _, _, _, _ ],
  ]);
});


test("glider", () => {
  const L = { type: 'active', flags: {} };
  const _ = { type: 'empty', flags: {} };
  const l = { type: 'active', flags: { emit: [0, 0, 0, 0, 0, 0, 0, 1] } };
  const d = { type: 'empty', flags: { emit: [0, 0, 0, 0, 0, 0, 0, -1] } };
  const lattice = [
    [ _, _, _, _, _, _ ],
    [ _, _, _, L, _, _ ],
    [ _, L, _, L, _, _ ],
    [ _, _, L, L, _, _ ],
    [ _, _, _, _, _, _ ],
    [ _, _, _, _, _, _ ],
  ];

  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [], validity: [] };
  //expect(world_update(world).lattice).toEqual([
  expect(apply(world_update, 1, world).lattice).toEqual([
    [ _, _, _, _, _, _ ],
    [ _, _, l, d, _, _ ],
    [ _, d, _, L, l, _ ],
    [ _, _, L, L, _, _ ],
    [ _, _, _, _, _, _ ],
    [ _, _, _, _, _, _ ],
  ]);
  expect(apply(world_update, 2, world).lattice).toEqual([
    [ _, _, _, _, _, _ ],
    [ _, _, d, l, _, _ ],
    [ _, _, _, d, L, _ ],
    [ _, _, L, L, l, _ ],
    [ _, _, _, _, _, _ ],
    [ _, _, _, _, _, _ ],
  ]);
  expect(apply(world_update, 3, world).lattice).toEqual([
    [ _, _, _, _, _, _ ],
    [ _, _, _, d, _, _ ],
    [ _, _, l, _, L, _ ],
    [ _, _, d, L, L, _ ],
    [ _, _, _, l, _, _ ],
    [ _, _, _, _, _, _ ],
  ]);
  expect(apply(world_update, 4, world).lattice).toEqual([
    [ _, _, _, _, _, _ ],
    [ _, _, _, _, _, _ ],
    [ _, _, d, _, L, _ ],
    [ _, _, l, d, L, _ ],
    [ _, _, _, L, l, _ ],
    [ _, _, _, _, _, _ ],
  ]);
});


test("beehive", () => {
  const L = { type: 'active', flags: {} };
  const _ = { type: 'empty', flags: {} };
  const lattice = [
    [ _, _, _, _, _, _ ],
    [ _, _, L, L, _, _ ],
    [ _, L, _, _, L, _ ],
    [ _, _, L, L, _, _ ],
    [ _, _, _, _, _, _ ],
  ];

  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [], validity: [] };
  //expect(world_update(world).lattice).toEqual([
  expect(apply(world_update, 1, world).lattice).toEqual(lattice);
});