import {
	chmodSync,
	mkdirSync,
	mkdtempSync,
	rmSync,
	writeFileSync,
} from "node:fs";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, describe, expect, it, vi } from "vitest";
import {
	createPiSession,
	type PiSession,
} from "../../../test/fixture/create-pi-session.ts";

import { writeWindowsExecutable } from "../../../test/fixture/windows-executable.ts";

const extensionPath = path.resolve(import.meta.dirname, "../index.ts");

type Case = {
	user?: unknown;
	project?: unknown;
	env?: string;
	untrusted?: boolean;
};

interface UiCall {
	args: unknown[];
}

/**
 * Install a recording UI context so `ctx.ui.setStatus` / `ctx.ui.notify` calls
 * are captured for assertions.
 */
function installRecordingUi(session: PiSession): {
	setStatusCalls: UiCall[];
	notifyCalls: UiCall[];
} {
	const setStatusCalls: UiCall[] = [];
	const notifyCalls: UiCall[] = [];
	session.session.extensionRunner.setUIContext(
		{
			setStatus: (...args: unknown[]) => setStatusCalls.push({ args }),
			notify: (...args: unknown[]) => notifyCalls.push({ args }),
		} as never,
		"print",
	);
	return { setStatusCalls, notifyCalls };
}

// Fake git answers after 500 ms: a short timeout drops the porcelain flags.
const SLOW = "main [?]";
const TIMED_OUT = "main";

describe("vcs-status.timeoutMs resolution", () => {
	let session: PiSession | undefined;
	let root: string | undefined;
	afterEach(async () => {
		await session?.dispose();
		session = undefined;
		if (root) rmSync(root, { recursive: true, force: true });
		root = undefined;
	});

	async function start(input: Case) {
		root = mkdtempSync(path.join(tmpdir(), "pi-ext-vcs-status-settings-"));
		if ("project" in input) {
			mkdirSync(path.join(root, ".pi"), { recursive: true });
			writeFileSync(
				path.join(root, ".pi", "settings.json"),
				JSON.stringify({ "vcs-status": { timeoutMs: input.project } }),
			);
		}
		mkdirSync(path.join(root, ".git"));
		writeFileSync(path.join(root, ".git/HEAD"), "ref: refs/heads/main\n");
		const bin = path.join(root, "bin");
		mkdirSync(bin);
		if (process.platform === "win32")
			writeWindowsExecutable(bin, "git", "# branch.head main\n? new\n", 500);
		else {
			writeFileSync(
				path.join(bin, "git"),
				"#!/bin/sh\nsleep 0.5 </dev/null >/dev/null 2>&1\nprintf '# branch.head main\\n? new\\n'\n",
			);
			chmodSync(path.join(bin, "git"), 0o755);
		}
		session = await createPiSession({
			cwd: root,
			extensionPaths: [extensionPath],
			...("user" in input
				? { userSettings: { "vcs-status": { timeoutMs: input.user } } }
				: {}),
			env: {
				PATH: `${bin}${path.delimiter}${process.env["PATH"]}`,
				PI_VCS_STATUS_TIMEOUT_MS: input.env,
			},
		});
		if (input.untrusted)
			session.session.settingsManager.setProjectTrusted(false);
		const { setStatusCalls, notifyCalls } = installRecordingUi(session);
		const vcsCalls = () =>
			setStatusCalls.filter((call) => call.args[0] === "vcs" && call.args[1]);
		const notifyBefore = notifyCalls.length;
		const vcsBefore = vcsCalls().length;
		await session.session.extensionRunner.emit({
			type: "session_start",
			reason: "startup",
		});
		await vi.waitFor(
			() => expect(vcsCalls().length).toBeGreaterThan(vcsBefore),
			{ timeout: 5000 },
		);
		const label = String(vcsCalls().at(-1)?.args[1]).split(" ").slice(1);
		const warnings = notifyCalls
			.slice(notifyBefore)
			.filter((call) => call.args[1] === "warning")
			.map((call) => call.args[0]);
		return { label: label.join(" "), warnings };
	}

	it.each([
		["default 2500 ms", {}, SLOW],
		["user value", { user: 100 }, TIMED_OUT],
		["env over settings", { user: 5000, env: "100" }, TIMED_OUT],
		["trusted project over user", { user: 5000, project: 100 }, TIMED_OUT],
		[
			"untrusted project ignored",
			{ user: 5000, project: 100, untrusted: true },
			SLOW,
		],
	] satisfies [string, Case, string][])(
		"%s",
		async (_name, input, expected) => {
			const { label, warnings } = await start(input);
			expect(label).toBe(expected);
			expect(warnings).toEqual([]);
		},
	);

	it.each([
		["string user", { user: "100" }, "user settings"],
		["fractional project", { user: 100, project: 1.5 }, "project settings"],
		["zero user", { user: 0 }, "user settings"],
		[
			"non-numeric env",
			{ user: 100, env: "fast" },
			"environment variable PI_VCS_STATUS_TIMEOUT_MS",
		],
	] satisfies [string, Case, string][])(
		"rejects %s without falling through",
		async (_name, input, source) => {
			const { label, warnings } = await start(input);
			expect(label).toBe(SLOW);
			expect(warnings).toEqual([
				`Invalid vcs-status.timeoutMs from ${source}; using default 2500 ms`,
			]);
		},
	);
});