import { describe, expect, it } from "bun:test";
import { Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
import type { ToolSession } from "@oh-my-pi/pi-coding-agent/tools";
import { EvalTool, getEvalToolDescription } from "@oh-my-pi/pi-coding-agent/tools/eval";

function makeSession(opts: { spawns: string | null }): ToolSession {
	return {
		cwd: "/tmp/eval-test",
		hasUI: false,
		getSessionFile: () => null,
		getSessionSpawns: () => opts.spawns,
		settings: Settings.isolated(),
	} as unknown as ToolSession;
}

describe("eval tool description", () => {
	it("advertises agent() when spawns are allowed", () => {
		const text = getEvalToolDescription({ py: true, js: true, spawns: true });
		expect(text).toContain("agent(prompt");
	});

	it("omits agent() when the session forbids spawning", () => {
		// Subagents with spawns: undefined (resolved to "") cannot launch tasks.
		// The prelude doc must not promise a helper that always throws.
		const text = getEvalToolDescription({ py: true, js: true, spawns: false });
		expect(text).not.toContain("agent(prompt");
	});

	it("EvalTool description reflects spawn policy from the session", () => {
		const wildcard = new EvalTool(makeSession({ spawns: "*" })).description;
		const denied = new EvalTool(makeSession({ spawns: "" })).description;
		expect(wildcard).toContain("agent(prompt");
		expect(denied).not.toContain("agent(prompt");
	});
});