import { describe, expect, it, vi, type Mock } from "vitest";
import { ClientResponseError, createBobbinClient, type BobbinContext } from "./client";
import { jsonGet, rawGet } from "./_request";

const jsonResponse = (body: unknown, init: ResponseInit = {}): Response =>
	new Response(JSON.stringify(body), {
		status: 200,
		headers: { "content-type": "application/json" },
		...init
	});

const makeCtx = (
	fetchMock: typeof globalThis.fetch,
	serviceUrl = "https://bobbin.test"
): BobbinContext => createBobbinClient({ serviceUrl, fetch: fetchMock });

const fetchedUrl = (mock: Mock<typeof globalThis.fetch>, n = 0): URL =>
	new URL(String(mock.mock.calls[n][0]));

describe("createBobbinClient", () => {
	it("normalizes trailing slashes off the service url", () => {
		const ctx = makeCtx(vi.fn(), "https://bobbin.test///");
		expect(ctx.serviceUrl).toBe("https://bobbin.test");
	});
});

describe("jsonGet URL construction", () => {
	it("appends an array param as repeated keys", async () => {
		const fetchMock = vi.fn<typeof globalThis.fetch>().mockResolvedValue(jsonResponse({ ok: 1 }));
		await jsonGet(makeCtx(fetchMock), "sh.tangled.repo.getRepos", { repos: ["a", "b"] });
		const url = fetchedUrl(fetchMock);
		expect(url.searchParams.getAll("repos")).toEqual(["a", "b"]);
		expect(url.search).toBe("?repos=a&repos=b");
	});

	it("omits undefined params entirely", async () => {
		const fetchMock = vi.fn<typeof globalThis.fetch>().mockResolvedValue(jsonResponse({ ok: 1 }));
		await jsonGet(makeCtx(fetchMock), "sh.tangled.x", { keep: "yes", drop: undefined });
		const url = fetchedUrl(fetchMock);
		expect(url.searchParams.has("drop")).toBe(false);
		expect(url.searchParams.get("keep")).toBe("yes");
	});

	it("resolves the query against the normalized origin", async () => {
		const fetchMock = vi.fn<typeof globalThis.fetch>().mockResolvedValue(jsonResponse({ ok: 1 }));
		await jsonGet(makeCtx(fetchMock, "https://bobbin.test/"), "sh.tangled.x", { a: "1" });
		expect(fetchedUrl(fetchMock).href).toBe("https://bobbin.test/xrpc/sh.tangled.x?a=1");
	});
});

describe("jsonGet request headers & signal", () => {
	it("sends accept: application/json and merges caller headers + signal", async () => {
		const fetchMock = vi.fn<typeof globalThis.fetch>().mockResolvedValue(jsonResponse({ ok: 1 }));
		const controller = new AbortController();
		await jsonGet(makeCtx(fetchMock), "sh.tangled.x", undefined, {
			headers: { "x-custom": "1" },
			signal: controller.signal
		});
		const init = fetchMock.mock.calls[0][1] as RequestInit;
		expect(init.headers).toMatchObject({ accept: "application/json", "x-custom": "1" });
		expect(init.signal).toBe(controller.signal);
	});
});

describe("jsonGet responses", () => {
	it("throws ClientResponseError carrying status + error/description for a JSON error body", async () => {
		const fetchMock = vi
			.fn<typeof globalThis.fetch>()
			.mockResolvedValue(
				jsonResponse({ error: "RecordNotFound", message: "no such repo" }, { status: 404 })
			);
		const err = await jsonGet(makeCtx(fetchMock), "sh.tangled.x").catch((e: unknown) => e);
		expect(err).toBeInstanceOf(ClientResponseError);
		const cre = err as ClientResponseError;
		expect(cre.status).toBe(404);
		expect(cre.error).toBe("RecordNotFound");
		expect(cre.description).toBe("no such repo");
	});

	it("falls back to the status line for a non-JSON error body (does not hang)", async () => {
		const fetchMock = vi.fn<typeof globalThis.fetch>().mockResolvedValue(
			new Response("<html>502 Bad Gateway</html>", {
				status: 502,
				statusText: "Bad Gateway"
			})
		);
		const err = await jsonGet(makeCtx(fetchMock), "sh.tangled.x").catch((e: unknown) => e);
		expect(err).toBeInstanceOf(ClientResponseError);
		const cre = err as ClientResponseError;
		expect(cre.status).toBe(502);
		expect(cre.error).toBe("XRPCError");
		expect(cre.description).toBe("Bad Gateway");
	});
});

describe("rawGet", () => {
	it("throws ClientResponseError on a non-2xx status", async () => {
		const fetchMock = vi
			.fn<typeof globalThis.fetch>()
			.mockResolvedValue(
				jsonResponse({ error: "UpstreamFailed", message: "knot down" }, { status: 502 })
			);
		const err = await rawGet(makeCtx(fetchMock), "sh.tangled.repo.archive").catch(
			(e: unknown) => e
		);
		expect(err).toBeInstanceOf(ClientResponseError);
		expect((err as ClientResponseError).status).toBe(502);
	});
});
