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 { createTestSession, type TestSession } from "../../../test/harness";

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

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

// 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 t: TestSession | undefined;
	let root: string | undefined;
	afterEach(async () => {
		await t?.session.extensionRunner.emit({
			type: "session_shutdown",
			reason: "quit",
		});
		t?.dispose();
		t = 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-"));
		const write = (dir: string, value: unknown) => {
			mkdirSync(dir, { recursive: true });
			writeFileSync(
				path.join(dir, "settings.json"),
				JSON.stringify({ "vcs-status": { timeoutMs: value } }),
			);
		};
		if ("user" in input)
			write(path.join(root, ".test-home/.pi/agent"), input.user);
		if ("project" in input) write(path.join(root, ".pi"), 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);
		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);
		t = await createTestSession({
			cwd: root,
			extensions: [extensionPath],
			env: {
				PATH: `${bin}${path.delimiter}${process.env.PATH}`,
				PI_VCS_STATUS_TIMEOUT_MS: input.env,
			},
		});
		if (input.untrusted) t.session.settingsManager.setProjectTrusted(false);
		const session = t;
		const vcsCalls = () =>
			session.events
				.uiCallsFor("setStatus")
				.filter((call) => call.args[0] === "vcs" && call.args[1]);
		const notifyBefore = session.events.uiCallsFor("notify").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 = session.events
			.uiCallsFor("notify")
			.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`,
			]);
		},
	);
});