/**
 * testing.ts — construct isolated runtimes with injected adapters so tests
 * never touch the real agent directory or the process singleton.
 */

import { mkdtempSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { FileStorage } from "./persistence.ts";
import { createRuntime, type PixRuntime } from "./runtime.ts";

export interface IsolatedRuntime {
	runtime: PixRuntime;
	agentDir: string;
	/** Remove the temp directory. */
	cleanup(): void;
}

/** Create a runtime backed by a fresh temp directory. */
export function createIsolatedRuntime(): IsolatedRuntime {
	const agentDir = mkdtempSync(join(tmpdir(), "pix-runtime-"));
	const runtime = createRuntime({ agentDir, storage: new FileStorage(agentDir) });
	return {
		runtime,
		agentDir,
		cleanup: () => rmSync(agentDir, { recursive: true, force: true }),
	};
}