/**
 * Owner-routed async delivery + quiescence (structured concurrency for
 * background jobs): each AgentSession registers a delivery sink for its own
 * agent id, owned job completions inject async-result follow-up turns into
 * THAT session, and `hasPendingAsyncWork()` / `settleAsyncWork()` define the
 * run quiescence the task executor's barrier is built on.
 */
import { afterEach, beforeEach, describe, expect, it } from "bun:test";
import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";
import { Agent } from "@oh-my-pi/pi-agent-core";
import { createMockModel } from "@oh-my-pi/pi-ai/providers/mock";
import { getBundledModel } from "@oh-my-pi/pi-catalog/models";
import { AsyncJobManager } from "@oh-my-pi/pi-coding-agent/async";
import { ModelRegistry } from "@oh-my-pi/pi-coding-agent/config/model-registry";
import { Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
import { AgentSession } from "@oh-my-pi/pi-coding-agent/session/agent-session";
import { AuthStorage } from "@oh-my-pi/pi-coding-agent/session/auth-storage";
import { convertToLlm } from "@oh-my-pi/pi-coding-agent/session/messages";
import { SessionManager } from "@oh-my-pi/pi-coding-agent/session/session-manager";
import { removeSyncWithRetries, Snowflake } from "@oh-my-pi/pi-utils";

describe("AgentSession owner-routed async delivery", () => {
	let session: AgentSession;
	let tempDir: string;
	const authStorages: AuthStorage[] = [];

	beforeEach(() => {
		tempDir = path.join(os.tmpdir(), `pi-async-delivery-test-${Snowflake.next()}`);
		fs.mkdirSync(tempDir, { recursive: true });
	});

	afterEach(async () => {
		if (session) {
			await session.dispose();
		}
		for (const authStorage of authStorages.splice(0)) {
			authStorage.close();
		}
		if (tempDir && fs.existsSync(tempDir)) {
			removeSyncWithRetries(tempDir);
		}
		AsyncJobManager.resetForTests();
	});

	it("injects an owned completion as a follow-up turn and reaches quiescence", async () => {
		const model = getBundledModel("anthropic", "claude-sonnet-4-5")!;
		const mock = createMockModel({ handler: () => ({ content: ["Done"] }) });
		const agent = new Agent({
			getApiKey: () => "test-key",
			initialState: { model, systemPrompt: ["Test"], tools: [] },
			convertToLlm,
			streamFn: mock.stream,
		});
		const authStorage = await AuthStorage.create(path.join(tempDir, "auth.db"));
		authStorages.push(authStorage);
		authStorage.setRuntimeApiKey("anthropic", "test-key");
		const manager = new AsyncJobManager({});
		AsyncJobManager.setInstance(manager);

		session = new AgentSession({
			agent,
			sessionManager: SessionManager.inMemory(),
			settings: Settings.isolated(),
			modelRegistry: new ModelRegistry(authStorage),
			agentId: "SubAgent",
			asyncJobManager: manager,
		});

		const gate = Promise.withResolvers<string>();
		manager.register("bash", "gated job", () => gate.promise, { id: "sub-job", ownerId: "SubAgent" });

		// A running owned job holds the session out of quiescence.
		expect(session.hasPendingAsyncWork()).toBe(true);

		gate.resolve("job finished: ALL GREEN");
		await session.settleAsyncWork();

		// The completion routed to THIS session (not a global default sink) and
		// ran as a follow-up turn whose context carries the job result.
		expect(session.hasPendingAsyncWork()).toBe(false);
		const sawResult = mock.calls.some(call =>
			call.context.messages.some(message => {
				if (typeof message.content === "string") {
					return message.content.includes("ALL GREEN");
				}
				return (
					Array.isArray(message.content) &&
					message.content.some(content => content.type === "text" && content.text.includes("ALL GREEN"))
				);
			}),
		);
		expect(sawResult).toBe(true);
	});

	it("still reports pending async work while a delivered result awaits injection", async () => {
		const model = getBundledModel("anthropic", "claude-sonnet-4-5")!;
		const mock = createMockModel({ handler: () => ({ content: ["Done"] }) });
		const agent = new Agent({
			getApiKey: () => "test-key",
			initialState: { model, systemPrompt: ["Test"], tools: [] },
			convertToLlm,
			streamFn: mock.stream,
		});
		const authStorage = await AuthStorage.create(path.join(tempDir, "auth.db"));
		authStorages.push(authStorage);
		authStorage.setRuntimeApiKey("anthropic", "test-key");
		const manager = new AsyncJobManager({});
		AsyncJobManager.setInstance(manager);

		session = new AgentSession({
			agent,
			sessionManager: SessionManager.inMemory(),
			settings: Settings.isolated(),
			modelRegistry: new ModelRegistry(authStorage),
			agentId: "SubAgent",
			asyncJobManager: manager,
		});

		const gate = Promise.withResolvers<string>();
		manager.register("bash", "gated job", () => gate.promise, { id: "sub-job", ownerId: "SubAgent" });
		gate.resolve("job finished: QUEUED RESULT");
		await manager.waitForOwnerJobs("SubAgent");
		await manager.drainDeliveries({ filter: { ownerId: "SubAgent" } });

		// The manager has fully handed off — no running jobs, no queued or
		// in-flight deliveries — but the async-result follow-up still sits on
		// the session's yield queue awaiting the (delayed) idle flush / next
		// step boundary. A terminal yield observed in this window MUST still
		// count as pending async work, or the run driver terminates and the
		// delivered result is silently dropped from the final report.
		expect(session.hasPendingAsyncWork()).toBe(true);

		// Settling drains the queued follow-up into a real turn and only then
		// reaches quiescence.
		await session.settleAsyncWork();
		expect(session.hasPendingAsyncWork()).toBe(false);
	});
});