import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import path from "node:path";
import { getModel } from "@earendil-works/pi-ai/compat";
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; untrusted?: boolean };

describe("fast.enable resolution", () => {
	let t: TestSession | undefined;
	let root: string | undefined;
	afterEach(() => {
		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-fast-settings-"));
		const write = (dir: string, value: unknown) => {
			mkdirSync(dir, { recursive: true });
			writeFileSync(
				path.join(dir, "settings.json"),
				JSON.stringify({ fast: { enable: 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);
		t = await createTestSession({ cwd: root, extensions: [extensionPath] });
		if (input.untrusted) t.session.settingsManager.setProjectTrusted(false);
		const model = getModel("openai-codex", "gpt-5.5");
		if (!model) throw new Error("missing openai-codex test model");
		// The harness pins an openai model; fast only activates for openai-codex.
		vi.spyOn(t.session, "model", "get").mockReturnValue(model);
		const session = t;
		await session.session.extensionRunner.emit({
			type: "session_start",
			reason: "startup",
		});
		await vi.waitFor(() =>
			expect(session.events.uiCallsFor("setStatus").length).toBeGreaterThan(0),
		);
		const status = session.events.uiCallsFor("setStatus").at(-1)?.args;
		const warnings = session.events
			.uiCallsFor("notify")
			.filter((call) => call.args[1] === "warning")
			.map((call) => call.args[0]);
		return { active: status?.[1] !== undefined, warnings };
	}

	it.each([
		["default off", {}, false],
		["user true", { user: true }, true],
		["project false over user true", { user: true, project: false }, false],
		["project true over user false", { user: false, project: true }, true],
		[
			"untrusted project ignored",
			{ user: true, project: false, untrusted: true },
			true,
		],
	] satisfies [string, Case, boolean][])(
		"%s",
		async (_name, input, expected) => {
			const { active, warnings } = await start(input);
			expect(active).toBe(expected);
			expect(warnings).toEqual([]);
		},
	);

	it.each([
		["string project", { user: true, project: "true" }, "project settings"],
		["numeric user", { user: 1 }, "user settings"],
	] satisfies [string, Case, string][])(
		"rejects %s without falling through",
		async (_name, input, source) => {
			const { active, warnings } = await start(input);
			expect(active).toBe(false);
			expect(warnings.at(-1)).toBe(
				`Invalid fast.enable from ${source}; fast mode off`,
			);
		},
	);
});