From 7a3fc898def0283ed6655b5c45a5f413638272a7 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sat, 11 Nov 2023 13:46:59 -0600
Subject: prevent agents from moving into immutable tiles

---
 src/simulation/validity.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 src/simulation/validity.js

(limited to 'src/simulation/validity.js')

diff --git a/src/simulation/validity.js b/src/simulation/validity.js
new file mode 100644
index 0000000..de4acd1
--- /dev/null
+++ b/src/simulation/validity.js
@@ -0,0 +1,14 @@
+export const validity = [
+  // prevent agents from moving onto immutables
+  (world, proposal) => (proposal.agent_changes || []).reduce(
+    (acc, change) => {
+      const {x, y} = change;
+      if (x !== undefined && y !== undefined && world.lattice[y][x].type === 'immutable') {
+        return false;
+      } else {
+        return acc;
+      }
+    },
+    true,
+  ),
+];
-- 
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