import { describe, expect, it } from "vitest";
import {
	consumeCompactionOnSessionCompact,
	createCompactionRuntime,
	ensureCompactionSourceMarked,
	markManualCompactionFromInput,
} from "../src/compaction";
import { createDefaultSettings } from "../src/settings";
import { createInitialState } from "../src/state";

describe("compaction source fallback on session_compact", () => {
	it("infers auto when session_compact runs without prior session_before_compact", () => {
		const runtime = createCompactionRuntime();
		const state = createInitialState();
		expect(runtime.pendingCompactionSource).toBeNull();

		ensureCompactionSourceMarked(runtime);
		const shouldReinject = consumeCompactionOnSessionCompact(
			runtime,
			state,
			true,
			createDefaultSettings(),
		);

		expect(shouldReinject).toBe(true);
		expect(state.lastCompactionSource).toBe("auto");
		expect(runtime.pendingCompactionSource).toBeNull();
	});

	it("keeps manual source from input and skips reinject by default", () => {
		const runtime = createCompactionRuntime();
		const state = createInitialState();
		markManualCompactionFromInput("/compact", runtime);

		ensureCompactionSourceMarked(runtime);
		const shouldReinject = consumeCompactionOnSessionCompact(
			runtime,
			state,
			true,
			createDefaultSettings(),
		);

		expect(shouldReinject).toBe(false);
		expect(state.lastCompactionSource).toBe("manual");
		expect(runtime.clearPendingReinjectOnNextUserInput).toBe(true);
	});
});