import { describe, expect, it } from "vitest";
import { resolveE2eStorageConfig } from "../__e2e__/support.js";
import { S3Store } from "../s3.js";

const config = {
	endpoint: "https://example.invalid",
	bucket: "bucket",
	region: "auto",
	accessKeyId: "id",
	secretAccessKey: "secret",
};

function recorder(response: () => Response) {
	const calls: { url: string; init: RequestInit }[] = [];
	const client = {
		fetch: (input: RequestInfo | URL, init?: RequestInit) => {
			calls.push({ url: String(input), init: init ?? {} });
			return Promise.resolve(response());
		},
	} as unknown as Pick<import("aws4fetch").AwsClient, "fetch">;
	return { calls, client };
}

function header(init: RequestInit, name: string): string | null {
	return new Headers(init.headers).get(name);
}

describe("real S3 E2E opt-in", () => {
	it("does not use credentials without explicit opt-in", () => {
		const env = {
			PI_BAK_S3_ENDPOINT: "https://example.invalid",
			PI_BAK_S3_ACCESS_KEY_ID: "id",
			PI_BAK_S3_SECRET_ACCESS_KEY: "secret",
		};
		expect(resolveE2eStorageConfig(env)).toBeUndefined();
		expect(
			resolveE2eStorageConfig({ ...env, PI_BAK_E2E_S3: "1" }),
		).toMatchObject({
			endpoint: env.PI_BAK_S3_ENDPOINT,
		});
		expect(() => resolveE2eStorageConfig({ PI_BAK_E2E_S3: "1" })).toThrow(
			/Real S3 E2E requires/,
		);
	});
});

describe("S3Store weak ETag handling", () => {
	it("requests identity encoding and strips weak validators on get", async () => {
		const { calls, client } = recorder(
			() =>
				new Response("body", {
					status: 200,
					headers: { etag: 'W/"abc"' },
				}),
		);
		const store = new S3Store(config, client);

		const object = await store.get("hosts/host.json");

		expect(object?.etag).toBe('"abc"');
		expect(header(calls[0]?.init ?? {}, "accept-encoding")).toBe("identity");
	});

	it("sends a strong validator when given a weak ifMatch", async () => {
		const { calls, client } = recorder(
			() => new Response(null, { status: 200, headers: { etag: 'W/"def"' } }),
		);
		const store = new S3Store(config, client);

		const etag = await store.put("hosts/host.json", "body", {
			contentType: "application/json",
			ifMatch: 'W/"abc"',
		});

		expect(header(calls[0]?.init ?? {}, "if-match")).toBe('"abc"');
		expect(etag).toBe('"def"');
	});
});