From 49312fea07e56e2d74179f4160a16cac6f614f97 Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Thu, 10 Aug 2023 15:27:32 -0500
Subject: add is_valid()

---
 src/genome/genome.js      | 19 +++++++++++++++++++
 src/genome/genome.test.js | 13 ++++++++++++-
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/genome/genome.js b/src/genome/genome.js
index e2bf83e..3445fe9 100644
--- a/src/genome/genome.js
+++ b/src/genome/genome.js
@@ -49,3 +49,22 @@ export function mutate(gene, type, value) {
 }
 
 
+export function is_valid(num_input, num_output, genome) {
+  const [ max_index, max_weight ] = genome.reduce(
+    ([max_index, max_weight ], [ source, sink, weight]) => [
+      Math.max(max_index, source, sink),
+      Math.max(max_weight, Math.abs(weight)),
+    ],
+    [ 0, 0 ]
+  );
+
+  if (max_index < num_input + num_output - 1) {
+    return false;
+  }
+  else if (max_weight > 4.0) {
+    return false;
+  }
+  else {
+    return true;
+  }
+}
diff --git a/src/genome/genome.test.js b/src/genome/genome.test.js
index ca56092..f50531b 100644
--- a/src/genome/genome.test.js
+++ b/src/genome/genome.test.js
@@ -1,6 +1,9 @@
 'use strict';
 
-import { mutation_type, mutate } from './genome';
+import { 
+  mutation_type, mutate,
+  is_valid,
+} from './genome';
 
 
 test('basic gene mutations', () => {
@@ -18,3 +21,11 @@ test('basic gene mutations', () => {
   expect(mutate([0, 1, 2], mutation_type.weight, 0.0)).toEqual([0, 1, -1]);
   expect(mutate([0, 1, 2], mutation_type.weight, 1.0)).toEqual([0, 1, 3]);
 });
+
+
+test('genome validation', () => {
+  expect(is_valid(0, 0, [ [ 0, 0, 1.0 ] ])).toBe(true);
+  expect(is_valid(2, 1, [ [ 0, 2, 1 ] ])).toBe(true);
+  expect(is_valid(2, 1, [ [ 0, 1, 1 ] ])).toBe(false);
+  expect(is_valid(2, 1, [ [ 0, 2, 5 ] ])).toBe(false);
+});
-- 
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