import { describe, expect, it, vi } from "vitest";
import {
	blobRawUrl,
	branches,
	gitTarget,
	knotMirrorTarget,
	log,
	resolveDefaultBranch,
	tag,
	tags,
	tree
} from "$lib/api/gitclient";

const config = { bobbinUrl: "https://bobbin.example" };
const repo = {
	uri: "at://did:plc:owner/sh.tangled.repo/core",
	repoDid: "did:plc:reporepo"
};

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

describe("gitTarget", () => {
	it("routes git ops to the mirror surface on bobbin keyed by repo DID", () => {
		const target = gitTarget(config, repo, globalThis.fetch);
		expect(target.ctx.serviceUrl).toBe("https://bobbin.example");
		expect(target.repo).toBe("did:plc:reporepo");
	});

	it("404s when the repo DID is unknown", () => {
		expect(() => gitTarget(config, { uri: repo.uri }, globalThis.fetch)).toThrow(
			expect.objectContaining({ status: 404 })
		);
	});

	it("keys the mirror target by repo DID", () => {
		expect(knotMirrorTarget(config, repo, globalThis.fetch).repo).toBe("did:plc:reporepo");
	});
});

describe("resolveDefaultBranch", () => {
	it("reads defaultBranch out of the mirror's branch list", async () => {
		const fetchMock = vi
			.fn<typeof globalThis.fetch>()
			.mockResolvedValue(jsonResponse({ branches: [], total: 2, defaultBranch: "master" }));
		const target = gitTarget(config, repo, fetchMock);

		await expect(resolveDefaultBranch(target)).resolves.toBe("master");

		const url = new URL(String(fetchMock.mock.calls[0][0]));
		expect(url.pathname).toBe("/xrpc/org.tangled.temp.git.listBranches");
		expect(url.searchParams.get("repo")).toBe(repo.repoDid);
	});

	it("returns null instead of throwing when the backend is down", async () => {
		const fetchMock = vi
			.fn<typeof globalThis.fetch>()
			.mockRejectedValue(new TypeError("fetch failed"));
		const target = gitTarget(config, repo, fetchMock);

		await expect(resolveDefaultBranch(target)).resolves.toBeNull();
	});
});

describe("endpoint routing", () => {
	const mirrorTarget = (fetchMock: typeof globalThis.fetch) => gitTarget(config, repo, fetchMock);
	const calledUrl = (fetchMock: ReturnType<typeof vi.fn<typeof globalThis.fetch>>, call = 0) =>
		new URL(String(fetchMock.mock.calls[call][0]));

	it("sends log to the mirror's listCommits keyed by DID, skip intact", async () => {
		const fetchMock = vi
			.fn<typeof globalThis.fetch>()
			.mockResolvedValue(jsonResponse({ commits: [] }));

		await log(mirrorTarget(fetchMock), { ref: "main", limit: 10, skip: 20 });

		const url = calledUrl(fetchMock);
		expect(url.origin).toBe("https://bobbin.example");
		expect(url.pathname).toBe("/xrpc/sh.tangled.git.temp2.listCommits");
		expect(url.searchParams.get("repo")).toBe(repo.repoDid);
		expect(url.searchParams.get("skip")).toBe("20");
	});

	it("sends tree to bobbin's getTree with the path param", async () => {
		const fetchMock = vi
			.fn<typeof globalThis.fetch>()
			.mockResolvedValue(jsonResponse({ entries: [] }));

		await tree(mirrorTarget(fetchMock), { ref: "main", path: "src/lib" });

		const url = calledUrl(fetchMock);
		expect(url.origin).toBe("https://bobbin.example");
		expect(url.pathname).toBe("/xrpc/org.tangled.temp.git.getTree");
		expect(url.searchParams.get("repo")).toBe(repo.repoDid);
		expect(url.searchParams.get("path")).toBe("src/lib");
	});

	it("sends branches and tags to the list endpoints on the mirror", async () => {
		const fetchMock = vi
			.fn<typeof globalThis.fetch>()
			.mockImplementation(() => Promise.resolve(jsonResponse({ branches: [], tags: [] })));
		const target = mirrorTarget(fetchMock);

		await branches(target, 5);
		await tags(target, 5);

		expect(calledUrl(fetchMock).pathname).toBe("/xrpc/org.tangled.temp.git.listBranches");
		expect(calledUrl(fetchMock, 1).pathname).toBe("/xrpc/org.tangled.temp.git.listTags");
	});

	it("routes single-tag reads to getRef on the mirror", async () => {
		const fetchMock = vi
			.fn<typeof globalThis.fetch>()
			.mockImplementation(() => Promise.resolve(jsonResponse({})));

		await tag(mirrorTarget(fetchMock), "v1.0.0");
		expect(calledUrl(fetchMock).pathname).toBe("/xrpc/org.tangled.temp.git.getRef");
	});

	it("builds the raw url against the mirror without a raw flag", () => {
		const url = new URL(
			blobRawUrl(mirrorTarget(globalThis.fetch), { ref: "main", path: "README.md" })
		);
		expect(url.origin).toBe("https://bobbin.example");
		expect(url.pathname).toBe("/xrpc/org.tangled.temp.git.getBlob");
		expect(url.searchParams.get("repo")).toBe(repo.repoDid);
		expect(url.searchParams.has("raw")).toBe(false);
	});
});