From 4715baef25b39d2614b1d0cc67d8bcff5676b6ce Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sat, 11 Nov 2023 15:48:28 -0600
Subject: add setup_board

---
 src/simulation/game.js      | 46 +++++++++++++++++++++++++++++++++++++++++++++
 src/simulation/game.test.js | 33 ++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 src/simulation/game.js
 create mode 100644 src/simulation/game.test.js

diff --git a/src/simulation/game.js b/src/simulation/game.js
new file mode 100644
index 0000000..991d125
--- /dev/null
+++ b/src/simulation/game.js
@@ -0,0 +1,46 @@
+'use strict';
+
+
+function is_wall(size, x, y) {
+  return (
+    x === 0 || x === size-1 ||
+    y === 0 || y === size-1
+  );
+}
+function is_corner(size, x, y) {
+  const subsize = Math.floor(size/3);
+  return (
+    (x < subsize || x >= 2*subsize) &&
+    (y < subsize || y >= 2*subsize)
+  );
+}
+function get_team(size, x, y) {
+  const subsize = Math.floor(size/3);
+  if (y < subsize) {
+    return 0;
+  } else if (x >= 2*subsize) {
+    return 1;
+  } else if (y >= 2*subsize) {
+    return 2;
+  } else if (x < subsize) {
+    return 3;
+  } else {
+    return undefined;
+  }
+}
+
+export function setup_board(size) {
+  const lattice = [...Array(size)]
+    .map(() => [...Array(size)])
+    .map((row, y) => row.map((_, x) => {
+      if (is_wall(size, x, y)) {
+        return { type: 'immutable', flags: {} };
+      } else if (is_corner(size, x, y)) {
+        return { type: 'immutable', flags: {} };
+      } else {
+        const team = get_team(size, x, y);
+        return { type: 'empty', flags: { team } };
+      }
+    }));
+  return lattice;
+}
diff --git a/src/simulation/game.test.js b/src/simulation/game.test.js
new file mode 100644
index 0000000..ac65618
--- /dev/null
+++ b/src/simulation/game.test.js
@@ -0,0 +1,33 @@
+'use strict';
+
+import { setup_board } from './game.js';
+
+
+test("set up boards correctly", () => {
+  const _ = { type: 'empty', flags: {} };
+  const a = { type: 'empty', flags: { team: 0 } };
+  const b = { type: 'empty', flags: { team: 1 } };
+  const c = { type: 'empty', flags: { team: 2 } };
+  const d = { type: 'empty', flags: { team: 3 } };
+  const W = { type: 'immutable', flags: {} };
+
+  expect(setup_board(6)).toEqual([
+    [ W, W, W, W, W, W, ],
+    [ W, W, a, a, W, W, ],
+    [ W, d, _, _, b, W, ],
+    [ W, d, _, _, b, W, ],
+    [ W, W, c, c, W, W, ],
+    [ W, W, W, W, W, W, ],
+  ]);
+  expect(setup_board(9)).toEqual([
+    [ W, W, W, W, W, W, W, W, W, ],
+    [ W, W, W, a, a, a, W, W, W, ],
+    [ W, W, W, a, a, a, W, W, W, ],
+    [ W, d, d, _, _, _, b, b, W, ],
+    [ W, d, d, _, _, _, b, b, W, ],
+    [ W, d, d, _, _, _, b, b, W, ],
+    [ W, W, W, c, c, c, W, W, W, ],
+    [ W, W, W, c, c, c, W, W, W, ],
+    [ W, W, W, W, W, W, W, W, W, ],
+  ]);
+});
-- 
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