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/*
Copyright 2019 Florian Dold
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
or implied. See the License for the specific language governing
permissions and limitations under the License.
*/
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 !== null && key !== undefined;
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;
if (maybeInlineKey >= currentKeyGenerator) {
updatedKeyGenerator = maybeInlineKey + 1;
} else {
updatedKeyGenerator = currentKeyGenerator;
}
} else {
key = maybeInlineKey;
updatedKeyGenerator = currentKeyGenerator;
}
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 {
if (autoIncrement) {
// (no, no, yes)
return {
key: currentKeyGenerator,
value: value,
updatedKeyGenerator: currentKeyGenerator + 1,
};
} else {
// (no, no, no)
throw new DataError();
}
}
}
}
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