import { describe, expect, it } from "vitest";
import {
	detectAndCachePiAutoCompact,
	detectPiAutoCompact,
	PI_AUTO_COMPACT_FOLLOW_UP_PREFIXES,
	resolveDeliveryMode,
} from "../src/auto-compact";
import { createDefaultSettings } from "../src/settings";
import { createRuntimeFlags } from "../src/state";

describe("detectPiAutoCompact", () => {
	it("returns true when auto-compact command is registered", () => {
		const pi = {
			getCommands: () => [{ name: "auto-compact" }],
		};
		expect(detectPiAutoCompact(pi as never)).toBe(true);
	});

	it("returns false when auto-compact command is absent", () => {
		const pi = {
			getCommands: () => [{ name: "skill-reinject" }],
		};
		expect(detectPiAutoCompact(pi as never)).toBe(false);
	});
});

describe("detectAndCachePiAutoCompact", () => {
	it("writes detect result into runtime flags", () => {
		const runtime = createRuntimeFlags();
		const pi = {
			getCommands: () => [{ name: "auto-compact" }],
		};
		expect(detectAndCachePiAutoCompact(pi as never, runtime)).toBe(true);
		expect(runtime.autoCompactDetected).toBe(true);
	});
});

describe("resolveDeliveryMode", () => {
	it("defers when pi-auto-compact is cached as detected", () => {
		const runtime = createRuntimeFlags();
		runtime.autoCompactDetected = true;
		expect(resolveDeliveryMode(createDefaultSettings(), runtime)).toBe("defer");
	});
});

describe("PI_AUTO_COMPACT_FOLLOW_UP_PREFIXES", () => {
	it("documents pi-auto-compact follow-up phrases from SPEC §16.9", () => {
		expect([...PI_AUTO_COMPACT_FOLLOW_UP_PREFIXES]).toEqual([
			"Auto-compact ran before this turn.",
			"Auto-compact ran mid-turn.",
			"Emergency auto-compact ran.",
			"Auto-compact ran on session resume.",
		]);
	});
});