1 files changed, 92 insertions, 0 deletions
diff --git a/packages/idb-bridge/src/util/makeStoreKeyValue.ts b/packages/idb-bridge/src/util/makeStoreKeyValue.ts
new file mode 100644
index 000000000..4850cec26
--- /dev/null
+++ b/packages/idb-bridge/src/util/makeStoreKeyValue.ts
@@ -0,0 +1,92 @@
+import { Value, Key, KeyPath } from "./types";
+import extractKey from "./extractKey";
+import { DataError } from "./errors";
+import valueToKey from "./valueToKey";
+import structuredClone from "./structuredClone";
+import injectKey from "./injectKey";
+
+export interface StoreKeyResult {
+  updatedKeyGenerator: number;
+  key: Key;
+  value: Value;
+}
+
+export function makeStoreKeyValue(
+  value: Value,
+  key: Key | undefined,
+  currentKeyGenerator: number,
+  autoIncrement: boolean,
+  keyPath: KeyPath | null,
+): StoreKeyResult {
+  const haveKey = key !== undefined && key !== null;
+  const haveKeyPath = keyPath !== null && keyPath !== undefined;
+
+  // This models a decision table on (haveKey, haveKeyPath, autoIncrement)
+
+  value = structuredClone(value);
+
+  if (haveKey) {
+    if (haveKeyPath) {
+      // (yes, yes, no)
+      // (yes, yes, yes)
+      throw new DataError();
+    } else {
+      if (autoIncrement) {
+        // (yes, no, yes)
+        key = valueToKey(key)!;
+        let updatedKeyGenerator: number;
+        if (typeof key !== "number") {
+          updatedKeyGenerator = currentKeyGenerator;
+        } else {
+          updatedKeyGenerator = key;
+        }
+        return {
+          key: key!,
+          value: value,
+          updatedKeyGenerator,
+        };
+      } else {
+        // (yes, no, no)
+        throw new DataError();
+      }
+    }
+  } else {
+    if (haveKeyPath) {
+      if (autoIncrement) {
+        // (no, yes, yes)
+
+        let updatedKeyGenerator: number;
+        const maybeInlineKey = extractKey(keyPath!, value);
+        if (maybeInlineKey === undefined) {
+          value = injectKey(keyPath!, value, currentKeyGenerator);
+          key = currentKeyGenerator;
+          updatedKeyGenerator = currentKeyGenerator + 1;
+        } else if (typeof maybeInlineKey === "number") {
+          key = maybeInlineKey;
+          updatedKeyGenerator = maybeInlineKey;
+        } else {
+          key = maybeInlineKey;
+          updatedKeyGenerator = currentKeyGenerator + 1;
+        }
+        return {
+          key: key,
+          value: value,
+          updatedKeyGenerator,
+        }
+      } else {
+        // (no, yes, no)
+        key = extractKey(keyPath!, value);
+        key = valueToKey(key);
+        return {
+          key: key!,
+          value: value,
+          updatedKeyGenerator: currentKeyGenerator,
+        };
+      }
+    } else {
+      // (no, no, yes)
+      // (no, no, no)
+      throw new DataError();
+    }
+  }
+}
+\ No newline at end of file