import type { AddressInfo } from "node:net";

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

import { HttpClient } from "../src/_shared/http.js";
import { WsConnection } from "../src/_shared/websocket.js";
import { resolveConfig } from "../src/config.js";
import {
	AuthenticationError,
	BadRequestError,
	ConflictError,
	ForbiddenError,
	HostHasCapsulesError,
	NotFoundError,
	PayloadTooLargeError,
	ServerError,
	TimeoutError,
	throwErrorFromResponse,
	WrennError,
} from "../src/exceptions.js";

describe("resolveConfig", () => {
	afterEach(() => {
		vi.unstubAllEnvs();
	});

	it("uses defaults when no options or environment variables are set", () => {
		vi.stubEnv("WRENN_BASE_URL", undefined);
		vi.stubEnv("WRENN_API_KEY", undefined);
		vi.stubEnv("WRENN_TOKEN", undefined);
		vi.stubEnv("WRENN_HOST_TOKEN", undefined);

		expect(resolveConfig()).toEqual({ baseUrl: "https://api.wrenn.dev" });
	});

	it("prefers explicit options over environment variables", () => {
		vi.stubEnv("WRENN_BASE_URL", "https://env.example.com");
		vi.stubEnv("WRENN_API_KEY", "env-api-key");
		vi.stubEnv("WRENN_TOKEN", "env-token");
		vi.stubEnv("WRENN_HOST_TOKEN", "env-host-token");

		expect(
			resolveConfig({
				baseUrl: "https://opts.example.com",
				apiKey: "opts-api-key",
				token: "opts-token",
				hostToken: "opts-host-token",
			}),
		).toEqual({
			baseUrl: "https://opts.example.com",
			apiKey: "opts-api-key",
			token: "opts-token",
			hostToken: "opts-host-token",
		});
	});
});

describe("throwErrorFromResponse", () => {
	it.each([
		[400, BadRequestError],
		[401, AuthenticationError],
		[403, ForbiddenError],
		[404, NotFoundError],
		[408, TimeoutError],
		[409, ConflictError],
		[413, PayloadTooLargeError],
		[500, ServerError],
	])("maps HTTP %i responses", async (status, ErrorClass) => {
		const response = Response.json(
			{ error: { code: "test_error", message: "Test failure" } },
			{ status, statusText: "Failed" },
		);

		await expect(throwErrorFromResponse(response)).rejects.toMatchObject({
			name: ErrorClass.name,
			statusCode: status,
			code: "test_error",
			message: "Test failure",
		});
	});

	it("maps host conflict responses with capsule IDs", async () => {
		const response = Response.json(
			{
				error: {
					code: "host_has_capsules",
					message: "Host has capsules",
					sandbox_ids: ["cap_1", "cap_2"],
				},
			},
			{ status: 409, statusText: "Conflict" },
		);

		const error = throwErrorFromResponse(response);

		await expect(error).rejects.toBeInstanceOf(HostHasCapsulesError);
		await expect(error).rejects.toMatchObject({
			name: "HostHasCapsulesError",
			statusCode: 409,
			sandboxIds: ["cap_1", "cap_2"],
		});
	});

	it("falls back to WrennError for non-JSON error bodies", async () => {
		const response = new Response("not json", {
			status: 418,
			statusText: "I'm a teapot",
		});

		await expect(throwErrorFromResponse(response)).rejects.toBeInstanceOf(
			WrennError,
		);
	});
});

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

	it("sends default auth headers and query params", async () => {
		const fetchMock = vi.fn(async () => Response.json({ ok: true }));
		vi.stubGlobal("fetch", fetchMock);

		const client = new HttpClient({
			baseUrl: "https://api.example.com/",
			apiKey: "api-key",
			token: "jwt-token",
			hostToken: "host-token",
		});

		await expect(
			client.get<{ ok: boolean }>("/v1/test", {
				params: { a: "one", b: 2, c: true, skipped: undefined },
			}),
		).resolves.toEqual({ ok: true });

		expect(fetchMock).toHaveBeenCalledWith(
			"https://api.example.com/v1/test?a=one&b=2&c=true",
			expect.objectContaining({
				method: "GET",
				headers: {
					Accept: "application/json",
					Authorization: "Bearer jwt-token",
					"X-API-Key": "api-key",
					"X-Host-Token": "host-token",
				},
			}),
		);
	});

	it("omits content type for bodyless requests", async () => {
		const fetchMock = vi.fn(async () => new Response(null, { status: 204 }));
		vi.stubGlobal("fetch", fetchMock);

		const client = new HttpClient({ baseUrl: "https://api.example.com" });

		await client.delete("/v1/test");

		expect(fetchMock).toHaveBeenCalledWith(
			"https://api.example.com/v1/test",
			expect.objectContaining({
				headers: { Accept: "application/json" },
				method: "DELETE",
			}),
		);
	});

	it("maps unsuccessful responses to SDK errors", async () => {
		vi.stubGlobal(
			"fetch",
			vi.fn(async () =>
				Response.json(
					{ error: { code: "missing", message: "Not found" } },
					{ status: 404 },
				),
			),
		);

		const client = new HttpClient({ baseUrl: "https://api.example.com" });

		await expect(client.get("/v1/missing")).rejects.toBeInstanceOf(
			NotFoundError,
		);
	});

	it("throws TimeoutError when timeoutMs aborts a request", async () => {
		vi.useFakeTimers();
		vi.stubGlobal(
			"fetch",
			vi.fn(
				(_url: string, init?: RequestInit) =>
					new Promise((_resolve, reject) => {
						init?.signal?.addEventListener("abort", () => {
							reject(new DOMException("Aborted", "AbortError"));
						});
					}),
			),
		);

		const client = new HttpClient({ baseUrl: "https://api.example.com" });
		const request = client.get("/v1/slow", { timeoutMs: 100 });
		const assertion = expect(request).rejects.toBeInstanceOf(TimeoutError);

		await vi.advanceTimersByTimeAsync(100);

		await assertion;
	});

	it("applies timeoutMs to multipart uploads", async () => {
		vi.useFakeTimers();
		vi.stubGlobal(
			"fetch",
			vi.fn(
				(_url: string, init?: RequestInit) =>
					new Promise((_resolve, reject) => {
						init?.signal?.addEventListener("abort", () => {
							reject(new DOMException("Aborted", "AbortError"));
						});
					}),
			),
		);

		const client = new HttpClient({ baseUrl: "https://api.example.com" });
		const upload = client.upload("/v1/upload", new FormData(), {
			timeoutMs: 100,
		});
		const assertion = expect(upload).rejects.toBeInstanceOf(TimeoutError);

		await vi.advanceTimersByTimeAsync(100);

		await assertion;
	});
});

describe("WsConnection", () => {
	it("connects, sends JSON messages, and receives parsed messages", async () => {
		const server = new WebSocketServer({ port: 0 });
		const messages: unknown[] = [];
		const receivedByServer = new Promise<unknown>((resolve) => {
			server.on("connection", (socket, request) => {
				expect(request.headers["x-api-key"]).toBe("api-key");
				expect(request.headers["x-host-token"]).toBe("host-token");
				socket.on("message", (raw) => resolve(JSON.parse(raw.toString())));
				socket.send(JSON.stringify({ type: "ready" }));
			});
		});

		await new Promise<void>((resolve) => server.once("listening", resolve));
		const address = server.address() as AddressInfo;
		const connection = await WsConnection.connect({
			baseUrl: `http://127.0.0.1:${address.port}`,
			path: "/stream",
			apiKey: "api-key",
			hostToken: "host-token",
			onMessage: (message) => messages.push(message),
		});

		connection.send({ type: "start" });

		await expect(receivedByServer).resolves.toEqual({ type: "start" });
		expect(messages).toEqual([{ type: "ready" }]);

		connection.close();
		server.close();
	});

	it("rejects with TimeoutError if the connection does not open in time", async () => {
		vi.useFakeTimers();
		const server = new WebSocketServer({ noServer: true });
		const connection = WsConnection.connect({
			baseUrl: "http://127.0.0.1:9",
			path: "/stream",
			timeoutMs: 100,
			onMessage: () => undefined,
		});
		const assertion = expect(connection).rejects.toBeInstanceOf(TimeoutError);

		await vi.advanceTimersByTimeAsync(100);

		await assertion;
		server.close();
		vi.useRealTimers();
	});
});