import { describe, expect, test } from "bun:test";
import { AsyncJobManager } from "@oh-my-pi/pi-coding-agent/async/job-manager";

describe("AsyncJobManager", () => {
	test("forwards progress updates and delivers completion", async () => {
		const progressEvents: Array<{ text: string; details?: Record<string, unknown> }> = [];
		const completions: Array<{ jobId: string; text: string }> = [];
		const manager = new AsyncJobManager({
			onJobComplete: async (jobId, text) => {
				completions.push({ jobId, text });
			},
		});

		const jobId = manager.register(
			"bash",
			"echo hi",
			async ({ reportProgress }) => {
				await reportProgress("running step", { async: { state: "running" } });
				return "final output";
			},
			{
				onProgress: async (text, details) => {
					progressEvents.push({ text, details });
				},
			},
		);

		await manager.waitForAll();
		await manager.drainDeliveries({ timeoutMs: 2_000 });

		expect(progressEvents).toEqual([{ text: "running step", details: { async: { state: "running" } } }]);
		expect(completions).toEqual([{ jobId, text: "final output" }]);
		expect(manager.getJob(jobId)?.status).toBe("completed");
	});

	test("swallows progress callback errors without failing the job", async () => {
		const completions: Array<{ jobId: string; text: string }> = [];
		const manager = new AsyncJobManager({
			onJobComplete: async (jobId, text) => {
				completions.push({ jobId, text });
			},
		});

		const jobId = manager.register(
			"task",
			"agent task",
			async ({ reportProgress }) => {
				await reportProgress("subagent started");
				return "task done";
			},
			{
				onProgress: async () => {
					throw new Error("progress renderer exploded");
				},
			},
		);

		await manager.waitForAll();
		await manager.drainDeliveries({ timeoutMs: 2_000 });

		expect(completions).toEqual([{ jobId, text: "task done" }]);
		expect(manager.getJob(jobId)?.status).toBe("completed");
	});

	test("delivers error text when run fails", async () => {
		const completions: Array<{ jobId: string; text: string }> = [];
		const manager = new AsyncJobManager({
			onJobComplete: async (jobId, text) => {
				completions.push({ jobId, text });
			},
		});

		const jobId = manager.register("bash", "bad command", async () => {
			throw new Error("command failed");
		});

		await manager.waitForAll();
		await manager.drainDeliveries({ timeoutMs: 2_000 });

		expect(completions).toEqual([{ jobId, text: "command failed" }]);
		expect(manager.getJob(jobId)?.status).toBe("failed");
		expect(manager.getJob(jobId)?.errorText).toBe("command failed");
	});

	test("cancels a running job by id", async () => {
		const completions: Array<{ jobId: string; text: string }> = [];
		const manager = new AsyncJobManager({
			onJobComplete: async (jobId, text) => {
				completions.push({ jobId, text });
			},
		});

		const jobId = manager.register("bash", "sleep", async ({ signal }) => {
			await new Promise<never>((_resolve, reject) => {
				signal.addEventListener(
					"abort",
					() => {
						reject(new Error("aborted"));
					},
					{ once: true },
				);
			});
			throw new Error("unreachable");
		});

		expect(manager.cancel(jobId)).toBe(true);
		expect(manager.cancel(jobId)).toBe(false);

		await manager.waitForAll();
		await manager.drainDeliveries({ timeoutMs: 2_000 });

		expect(manager.getJob(jobId)?.status).toBe("cancelled");
		expect(completions).toHaveLength(0);
	});

	test("enforces maxRunningJobs cap", () => {
		const manager = new AsyncJobManager({
			maxRunningJobs: 1,
			onJobComplete: async () => {},
		});

		const firstJobId = manager.register("bash", "first", async ({ signal }) => {
			await new Promise<void>(resolve => {
				signal.addEventListener("abort", () => resolve(), { once: true });
			});
			return "done";
		});

		expect(() =>
			manager.register("bash", "second", async () => {
				return "second";
			}),
		).toThrow(/Background job limit reached/);

		manager.cancel(firstJobId);
	});

	test("evicts completed jobs after retention period", async () => {
		const manager = new AsyncJobManager({
			retentionMs: 25,
			onJobComplete: async () => {},
		});

		const jobId = manager.register("task", "short", async () => "done");
		await manager.waitForAll();
		await manager.drainDeliveries({ timeoutMs: 2_000 });

		expect(manager.getJob(jobId)?.status).toBe("completed");
		await Bun.sleep(60);
		expect(manager.getJob(jobId)).toBeUndefined();
	});

	test("cancelAll does not clear retention timers for already completed jobs", async () => {
		const manager = new AsyncJobManager({
			retentionMs: 30,
			onJobComplete: async () => {},
		});

		const completedJobId = manager.register("task", "completed", async () => "done");
		const runningJobId = manager.register("bash", "running", async ({ signal }) => {
			await new Promise<void>(resolve => {
				signal.addEventListener("abort", () => resolve(), { once: true });
			});
			throw new Error("aborted");
		});

		const completedDeadline = Date.now() + 2_000;
		while (manager.getJob(completedJobId)?.status === "running") {
			if (Date.now() >= completedDeadline) throw new Error("Timed out waiting for completed job");
			await Bun.sleep(5);
		}
		manager.cancelAll();
		await manager.waitForAll();
		await manager.drainDeliveries({ timeoutMs: 2_000 });

		expect(manager.getJob(completedJobId)?.status).toBe("completed");
		expect(manager.getJob(runningJobId)?.status).toBe("cancelled");

		await Bun.sleep(80);
		expect(manager.getJob(completedJobId)).toBeUndefined();
		expect(manager.getJob(runningJobId)).toBeUndefined();
	});

	test("acknowledgeDeliveries suppresses pending retries for completed jobs", async () => {
		let attempts = 0;
		const manager = new AsyncJobManager({
			onJobComplete: async () => {
				attempts += 1;
				throw new Error("delivery failed");
			},
		});

		const jobId = manager.register("task", "awaited-job", async () => "done");
		await manager.waitForAll();

		const firstAttemptDeadline = Date.now() + 2_000;
		while (attempts === 0) {
			if (Date.now() >= firstAttemptDeadline) throw new Error("Timed out waiting for first delivery attempt");
			await Bun.sleep(5);
		}

		expect(manager.hasPendingDeliveries()).toBe(true);
		const removed = manager.acknowledgeDeliveries([jobId]);
		expect(removed).toBeGreaterThanOrEqual(1);

		const drained = await manager.drainDeliveries({ timeoutMs: 200 });
		expect(drained).toBe(true);
		expect(manager.hasPendingDeliveries()).toBe(false);

		const attemptsAfterAck = attempts;
		await Bun.sleep(700);
		expect(attempts).toBe(attemptsAfterAck);
	});

	test("dispose clears jobs and pending deliveries", async () => {
		const manager = new AsyncJobManager({
			onJobComplete: async () => {
				throw new Error("delivery failed");
			},
		});

		manager.register("bash", "will-complete", async () => "output");
		await manager.waitForAll();
		expect(manager.hasPendingDeliveries()).toBe(true);

		const drained = await manager.dispose({ timeoutMs: 25 });
		expect(drained).toBe(false);
		expect(manager.getAllJobs()).toHaveLength(0);
		expect(manager.hasPendingDeliveries()).toBe(false);
	});

	test("uses custom id when provided and deduplicates collisions", async () => {
		const manager = new AsyncJobManager({
			onJobComplete: async () => {},
		});

		const first = manager.register("task", "alpha", async () => "ok", { id: "2-CheckRustCrate" });
		const second = manager.register("task", "beta", async () => "ok", { id: "2-CheckRustCrate" });

		expect(first).toBe("2-CheckRustCrate");
		expect(second).toBe("2-CheckRustCrate-2");

		await manager.waitForAll();
	});
});