import { afterEach, describe, expect, it, vi } from "vitest";

import { Capsule, Sandbox } from "../src/capsule.js";

interface CapturedRequest {
	url: string;
	init: RequestInit;
}

function setupFetch(responses: Response[]) {
	const calls: CapturedRequest[] = [];
	const fetchMock = vi.fn(
		async (url: string | URL | Request, init?: RequestInit) => {
			calls.push({ url: String(url), init: init ?? {} });
			const response = responses.shift();
			if (!response) throw new Error("No mock response configured");
			return response;
		},
	);
	vi.stubGlobal("fetch", fetchMock);
	return { calls, fetchMock };
}

function capsuleResponse(id: string, status = "running") {
	return Response.json({
		id,
		memory_mb: 512,
		status,
		template: "minimal",
		timeout_sec: 0,
		vcpus: 1,
	});
}

describe("Capsule", () => {
	afterEach(() => {
		vi.unstubAllGlobals();
		vi.unstubAllEnvs();
		vi.useRealTimers();
	});

	it("wraps an existing capsule without fetching it", () => {
		const fetchMock = vi.fn();
		vi.stubGlobal("fetch", fetchMock);

		const capsule = Capsule.connect("cap_1", {
			apiKey: "api-key",
			baseUrl: "https://api.example.com",
		});

		expect(capsule.id).toBe("cap_1");
		expect(fetchMock).not.toHaveBeenCalled();
		expect(capsule).toBeInstanceOf(Capsule);
	});

	it("creates a capsule from defaulted options", async () => {
		const { calls } = setupFetch([capsuleResponse("cap_created")]);

		const capsule = await Capsule.create({
			apiKey: "api-key",
			baseUrl: "https://api.example.com/",
		});

		expect(capsule.id).toBe("cap_created");
		expect(calls.at(-1)?.url).toBe("https://api.example.com/v1/capsules");
		expect(calls.at(-1)?.init.method).toBe("POST");
		expect(calls.at(-1)?.init.body).toBe(
			JSON.stringify({
				memory_mb: 512,
				template: "minimal",
				timeout_sec: 0,
				vcpus: 1,
			}),
		);
	});

	it("creates a capsule with a template overload and explicit resources", async () => {
		const { calls } = setupFetch([capsuleResponse("cap_custom")]);

		const capsule = await Capsule.create("node", {
			apiKey: "api-key",
			baseUrl: "https://api.example.com",
			memory_mb: 1024,
			timeout_sec: 60,
			vcpus: 2,
		});

		expect(capsule.id).toBe("cap_custom");
		expect(calls.at(-1)?.init.body).toBe(
			JSON.stringify({
				memory_mb: 1024,
				template: "node",
				timeout_sec: 60,
				vcpus: 2,
			}),
		);
	});

	it("throws when create does not return an id", async () => {
		setupFetch([Response.json({ status: "running" })]);

		await expect(
			Capsule.create({ baseUrl: "https://api.example.com" }),
		).rejects.toThrow("Created capsule response did not include an id");
	});

	it("maps instance lifecycle methods to the low-level client", async () => {
		const { calls } = setupFetch([
			capsuleResponse("cap_1"),
			Response.json({ sandbox_id: "cap_1", range: "10m", points: [] }),
			new Response(null, { status: 204 }),
			capsuleResponse("cap_1", "paused"),
			capsuleResponse("cap_1", "running"),
			new Response(null, { status: 204 }),
		]);
		const capsule = new Capsule("cap_1", {
			baseUrl: "https://api.example.com",
		});

		await expect(capsule.getInfo()).resolves.toMatchObject({ id: "cap_1" });
		await expect(capsule.getMetrics({ range: "10m" })).resolves.toMatchObject({
			range: "10m",
		});
		await expect(capsule.ping()).resolves.toBeUndefined();
		await expect(capsule.pause()).resolves.toMatchObject({ status: "paused" });
		await expect(capsule.resume()).resolves.toMatchObject({
			status: "running",
		});
		await expect(capsule.destroy()).resolves.toBeUndefined();

		expect(calls.map((call) => `${call.init.method} ${call.url}`)).toEqual([
			"GET https://api.example.com/v1/capsules/cap_1",
			"GET https://api.example.com/v1/capsules/cap_1/metrics?range=10m",
			"POST https://api.example.com/v1/capsules/cap_1/ping",
			"POST https://api.example.com/v1/capsules/cap_1/pause",
			"POST https://api.example.com/v1/capsules/cap_1/resume",
			"DELETE https://api.example.com/v1/capsules/cap_1",
		]);
	});

	it("waits until the capsule is running", async () => {
		vi.useFakeTimers();
		const { calls } = setupFetch([
			capsuleResponse("cap_1", "pending"),
			capsuleResponse("cap_1", "starting"),
			capsuleResponse("cap_1", "running"),
		]);
		const capsule = new Capsule("cap_1", {
			baseUrl: "https://api.example.com",
		});

		const ready = capsule.waitForReady({ intervalMs: 100, timeoutMs: 1_000 });
		await vi.advanceTimersByTimeAsync(100);
		await vi.advanceTimersByTimeAsync(100);

		await expect(ready).resolves.toMatchObject({ status: "running" });
		expect(calls).toHaveLength(3);
	});

	it("fails waitForReady on terminal capsule states", async () => {
		setupFetch([capsuleResponse("cap_1", "error")]);
		const capsule = new Capsule("cap_1", {
			baseUrl: "https://api.example.com",
		});

		await expect(capsule.waitForReady()).rejects.toThrow(
			'Capsule cap_1 reached terminal status "error"',
		);
	});

	it("times out while waiting for readiness", async () => {
		vi.useFakeTimers();
		setupFetch([
			capsuleResponse("cap_1", "starting"),
			capsuleResponse("cap_1", "starting"),
		]);
		const capsule = new Capsule("cap_1", {
			baseUrl: "https://api.example.com",
		});

		const ready = capsule.waitForReady({ intervalMs: 100, timeoutMs: 150 });
		const assertion = expect(ready).rejects.toThrow(
			"Timed out waiting for capsule cap_1 to become running",
		);
		await vi.advanceTimersByTimeAsync(100);
		await vi.advanceTimersByTimeAsync(50);

		await assertion;
	});

	it("does not mutate the remote capsule when closed or disposed", async () => {
		const fetchMock = vi.fn();
		vi.stubGlobal("fetch", fetchMock);
		const capsule = new Capsule("cap_1", {
			baseUrl: "https://api.example.com",
		});

		capsule.close();
		await capsule[Symbol.asyncDispose]();

		expect(fetchMock).not.toHaveBeenCalled();
	});

	it("exports Sandbox as a deprecated Capsule alias", () => {
		expect(Sandbox).toBe(Capsule);
	});
});