feat: add unique waterbody fingerprints

2026-09-12 15:35:57 +07:00
parent 80d534d549
commit 2ce1e20af2
10 changed files with 65 additions and 14 deletions
@@ -0,0 +1,23 @@
+export type WaterbodyVisual = {
+  shore: number;
+  waves: number;
+  markerX: number;
+  markerY: number;
+  code: string;
+};
+
+export function stableVisualHash(identity: string): number {
+  return [...identity.trim().toLocaleLowerCase("ru")]
+    .reduce((hash, char) => Math.imul(hash ^ (char.codePointAt(0) ?? 0), 16777619) >>> 0, 2166136261);
+}
+
+export function waterbodyVisual(identity: string): WaterbodyVisual {
+  const hash = stableVisualHash(identity || "waterbody");
+  return {
+    shore: hash % 8,
+    waves: 1 + ((hash >>> 4) % 3),
+    markerX: 32 + ((hash >>> 8) % 59),
+    markerY: 18 + ((hash >>> 15) % 23),
+    code: hash.toString(36).toUpperCase().padStart(2, "0").slice(-2),
+  };
+}