import { describe, expect, test } from "bun:test";
import {
	getRequestCacheStoreResolution,
	resolveRequestCacheStore,
} from "@/external/storage/cache/resolveRequestCacheStore.js";

const fakeKv = {
	get: async () => null,
	put: async () => undefined,
	delete: async () => undefined,
};

describe("resolveRequestCacheStore", () => {
	test("uses memory as the default request cache store", () => {
		const store = resolveRequestCacheStore({
			env: {} as Env,
		});

		expect(store.metadata.backend).toBe("memory");
		expect(store.metadata.consistencyMode).toBe("strong");
	});

	test("uses KV only when the binding exists and USE_KV_CACHE is enabled", () => {
		const store = resolveRequestCacheStore({
			env: {
				CACHE_KV: fakeKv,
				USE_KV_CACHE: "true",
			} as unknown as Env,
		});

		expect(store.metadata.backend).toBe("kv");
		expect(store.metadata.consistencyMode).toBe("eventual");
	});

	test("uses memory when USE_KV_CACHE is enabled without a binding", () => {
		const store = resolveRequestCacheStore({
			env: {
				USE_KV_CACHE: "true",
			} as unknown as Env,
		});

		expect(store.metadata.backend).toBe("memory");
	});

	test("reports cache store resolution for ready checks", () => {
		expect(
			getRequestCacheStoreResolution({
				CACHE_KV: fakeKv,
				USE_KV_CACHE: "true",
			} as unknown as Env),
		).toEqual({
			backend: "kv",
			kvEnabled: true,
			kvBound: true,
		});

		expect(
			getRequestCacheStoreResolution({
				USE_KV_CACHE: "true",
			} as unknown as Env),
		).toEqual({
			backend: "memory",
			kvEnabled: true,
			kvBound: false,
		});
	});
});