From f78493e192daf4639b91352909e4029b9970fcdb Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Wed, 8 Nov 2023 00:47:06 -0600
Subject: implement basic sensing & refactor world/cells -> lattice

---
 src/world/lattice.js | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/world/lattice.js

(limited to 'src/world/lattice.js')

diff --git a/src/world/lattice.js b/src/world/lattice.js
new file mode 100644
index 0000000..243a47d
--- /dev/null
+++ b/src/world/lattice.js
@@ -0,0 +1,52 @@
+'use strict';
+
+// get the proposals for cell updates
+export function lattice_update(lattice, update_rules) {
+  return lattice
+    .map((row, y) => row.map((cell, x) => [x, y, cell.type]))
+    .flat()
+    .reduce((acc, [x, y, type]) => [...acc, update_rules[type](lattice, x, y)], [])
+    .filter(x => x !== undefined)
+}
+
+
+// check if, given the current lattice configuration, a proposal is valid
+export function lattice_valid(lattice, proposal) {
+  if (!proposal.world_updates) { return true; }
+  return proposal.world_updates.reduce(
+    (acc, update) => {
+      const valid = 
+        (update.x >= 0 && update.x < lattice[0].length) &&
+        (update.y >= 0 && update.y < lattice.length) &&
+        (lattice[update.y][update.x].type == update.from)
+        return valid && acc;
+    },
+    true
+  );
+}
+
+
+// apply a set of proposals, returning the new lattice
+export function lattice_apply(lattice, proposals) {
+  return proposals.reduce(
+    (acc, prop) => {
+      const change = (prop.world_updates || []).reduce(
+        (acc_, update) => {
+          const cell = acc_[update.y][update.x];
+          if (update.to) { cell.type = update.to; }
+          if (update.flags) {
+            cell.flags = cell.flags || {}
+            // this is very side-effect-y but i couldn't think of a nicer compatible way of doing it 😔
+            for (let k of Object.keys(update.flags)) {
+              cell.flags[k] = update.flags[k];
+            }
+          }
+          return acc_
+        },
+        [...acc]
+      );
+      return change;
+    },
+    [...lattice].map(row => row.map(cell => ({ ...cell, flags: {}, })))
+  );
+}
-- 
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