import { ScheduledJobMisfirePolicy } from '@n8n/constants';
import { testDb } from '@n8n/backend-test-utils';
import type {
	NewScheduledJob,
	ScheduledJob as ScheduledJobEntity,
	ScheduledTask as ScheduledTaskEntity,
	TerminalTaskStatus,
} from '@n8n/db';
import {
	DbConnectionOptions,
	ScheduledJobRepository,
	ScheduledTask,
	ScheduledTaskRepository,
} from '@n8n/db';
import { Container } from '@n8n/di';
import { DataSource, In } from '@n8n/typeorm';

import { selfOwned, workflowOwned } from './shared/job-factory';

// SKIP LOCKED and truly parallel writes only apply on Postgres; the local sqlite driver
// serializes every writer through a single lock. Tests that need real parallelism are
// gated to Postgres (CI/container runs set DB_TYPE=postgresdb).
const isPostgres = process.env.DB_TYPE === 'postgresdb';

// The scheduler's repositories drive the materializer's claim / record / advance steps; these
// exercise them directly against the database, opening transactions via the DataSource.
describe('scheduled repositories', () => {
	let dataSource: DataSource;
	let jobRepository: ScheduledJobRepository;
	let taskRepository: ScheduledTaskRepository;

	// Second DataSource with its own pool, used to hold a concurrent transaction open
	// against the same database. The main DataSource runs with poolSize=1 in CI
	// (set by setup-testcontainers.ts to surface pooling deadlocks), so it can't hand
	// out two connections at once; the disjoint-claim test needs both held open together.
	let secondaryDataSource: DataSource | undefined;

	beforeAll(async () => {
		await testDb.init();
		dataSource = Container.get(DataSource);
		jobRepository = Container.get(ScheduledJobRepository);
		taskRepository = Container.get(ScheduledTaskRepository);

		if (isPostgres) {
			// Full options (not just overrides) so the secondary DataSource registers the same
			// entities and table prefix, letting the repositories build queries on its manager.
			secondaryDataSource = new DataSource(Container.get(DbConnectionOptions).getOptions());
			await secondaryDataSource.initialize();
		}
	});

	beforeEach(async () => {
		await testDb.truncate(['ScheduledTask', 'ScheduledJob']);
	});

	afterAll(async () => {
		if (secondaryDataSource?.isInitialized) {
			await secondaryDataSource.destroy();
		}
		await testDb.terminate();
	});

	// `claimDue` judges due-ness against the database clock, so set nextRunAt relative
	// to now rather than a fixed instant we can't inject.
	const secondsFromNow = (seconds: number) => new Date(Date.now() + seconds * 1000);

	/** Insert a self-owned interval job, return the saved entity. */
	async function createJob(
		overrides: Partial<ScheduledJobEntity> = {},
	): Promise<ScheduledJobEntity> {
		const jobName = `job-${Math.random().toString(36).slice(2)}`;
		return await jobRepository.save(
			jobRepository.create({
				name: jobName,
				...selfOwned(jobName),
				taskType: 'scheduleTrigger',
				payload: {},
				kind: 'interval',
				intervalSeconds: 60,
				enabled: true,
				nextRunAt: secondsFromNow(-60),
				maxAttempts: 1,
				...overrides,
			}),
		);
	}

	/** A minimal interval job row; bookkeeping columns take their defaults. */
	const newJobRow = (name: string, overrides: Partial<NewScheduledJob> = {}): NewScheduledJob => ({
		name,
		misfirePolicy: ScheduledJobMisfirePolicy.Coalesce,
		misfireGraceSeconds: 60,
		...selfOwned(name),
		taskType: 'scheduleTrigger',
		payload: {},
		kind: 'interval',
		cronExpression: null,
		timezone: null,
		recurrenceUnit: null,
		recurrenceSize: null,
		intervalSeconds: 60,
		fireAt: null,
		nextRunAt: secondsFromNow(-60),
		maxAttempts: 1,
		...overrides,
	});

	/** Insert a task in a given lifecycle state; `scheduledFor` is made unique per row. */
	let taskSequence = 0;
	async function createTask(
		jobId: number,
		overrides: Partial<ScheduledTaskEntity> = {},
	): Promise<ScheduledTaskEntity> {
		const scheduledFor = secondsFromNow(-++taskSequence);
		return await taskRepository.save(
			taskRepository.create({
				jobId,
				taskType: 'scheduleTrigger',
				payload: {},
				scheduledFor,
				runAt: scheduledFor,
				maxAttempts: 1,
				...overrides,
			}),
		);
	}

	describe('transaction', () => {
		it('commits repository calls made through the transaction manager', async () => {
			const job = await createJob({ nextRunAt: secondsFromNow(-60) });
			const nextRunAt = secondsFromNow(3600);
			const scheduledFor = secondsFromNow(-60);

			await dataSource.transaction(async (trx) => {
				await jobRepository.advanceMany(trx, [
					{ id: job.id, nextRunAt, lastFiredAt: scheduledFor },
				]);
				await taskRepository.insertIgnoringDuplicates(trx, [
					{
						jobId: job.id,
						taskType: 'scheduleTrigger',
						payload: {},
						scheduledFor,
						runAt: scheduledFor,
						maxAttempts: 1,
					},
				]);
			});

			const reloaded = await jobRepository.findOneByOrFail({ id: job.id });
			expect(reloaded.nextRunAt!.getTime()).toBe(nextRunAt.getTime());
			expect(await taskRepository.findBy({ jobId: job.id })).toHaveLength(1);
		});

		it('rolls back all writes when the callback throws', async () => {
			const nextRunAt = secondsFromNow(-60);
			const job = await createJob({ nextRunAt });
			const scheduledFor = secondsFromNow(-60);

			await expect(
				dataSource.transaction(async (trx) => {
					await taskRepository.insertIgnoringDuplicates(trx, [
						{
							jobId: job.id,
							taskType: 'scheduleTrigger',
							payload: {},
							scheduledFor,
							runAt: scheduledFor,
							maxAttempts: 1,
						},
					]);
					await jobRepository.advanceMany(trx, [
						{ id: job.id, nextRunAt: secondsFromNow(3600), lastFiredAt: scheduledFor },
					]);
					throw new Error('boom');
				}),
			).rejects.toThrow('boom');

			// Neither the occurrence nor the schedule advance survived.
			expect(await taskRepository.findBy({ jobId: job.id })).toHaveLength(0);
			const reloaded = await jobRepository.findOneByOrFail({ id: job.id });
			expect(reloaded.nextRunAt!.getTime()).toBe(nextRunAt.getTime());
			expect(reloaded.lastFiredAt).toBeNull();
		});

		it('rejects insertIgnoringDuplicates when called outside a transaction', async () => {
			const job = await createJob();
			const scheduledFor = secondsFromNow(-60);

			// The plain DataSource manager has no queryRunner, which is how the guard
			// detects a call made outside `dataSource.transaction`.
			await expect(
				taskRepository.insertIgnoringDuplicates(dataSource.manager, [
					{
						jobId: job.id,
						taskType: 'scheduleTrigger',
						payload: {},
						scheduledFor,
						runAt: scheduledFor,
						maxAttempts: 1,
					},
				]),
			).rejects.toThrow('insertIgnoringDuplicates must run within a transaction');

			expect(await taskRepository.findBy({ jobId: job.id })).toHaveLength(0);
		});
	});

	describe('ScheduledJobRepository.claimDue', () => {
		it('returns due jobs ordered by nextRunAt, capped at limit', async () => {
			// Insert out of nextRunAt order so the result proves ORDER BY, not insertion order.
			const dueLate = await createJob({ nextRunAt: secondsFromNow(-60) });
			const dueEarly = await createJob({ nextRunAt: secondsFromNow(-120) });
			await createJob({ nextRunAt: secondsFromNow(-30) }); // due, but past the limit

			const claimed = await dataSource.transaction(
				async (trx) => await jobRepository.claimDue(trx, 2),
			);

			expect(claimed?.jobs.map((j) => j.id)).toEqual([dueEarly.id, dueLate.id]);
		});

		it('claims a not-yet-due job whose nextRunAt falls within the lookahead', async () => {
			// The materializer polls on a fixed tick, so a job due just after a tick would
			// otherwise wait a whole interval to be noticed. Claiming ahead of due lets the
			// job be planned before its window lapses. Default (0) lookahead ignores it.
			const soon = await createJob({ nextRunAt: secondsFromNow(5) });

			const strict = await dataSource.transaction(
				async (trx) => await jobRepository.claimDue(trx, 100),
			);
			expect(strict).toBeUndefined();

			const withLookahead = await dataSource.transaction(
				async (trx) => await jobRepository.claimDue(trx, 100, 10_000),
			);
			expect(withLookahead?.jobs.map((j) => j.id)).toEqual([soon.id]);
		});

		it('still excludes a job whose nextRunAt is beyond the lookahead', async () => {
			await createJob({ nextRunAt: secondsFromNow(60) });

			const claimed = await dataSource.transaction(
				async (trx) => await jobRepository.claimDue(trx, 100, 10_000),
			);
			expect(claimed).toBeUndefined();
		});

		it('excludes disabled, future, and null-nextRunAt jobs', async () => {
			await createJob({ enabled: false, nextRunAt: secondsFromNow(-60) });
			await createJob({ nextRunAt: secondsFromNow(3600) });
			await createJob({ nextRunAt: null });

			const claimed = await dataSource.transaction(
				async (trx) => await jobRepository.claimDue(trx, 100),
			);

			expect(claimed).toBeUndefined();
		});

		it('persists and reads back each schedule kind from its columns', async () => {
			const dueAt = secondsFromNow(-60);
			const fireAt = secondsFromNow(-120);
			const cron = await createJob({
				kind: 'cron',
				cronExpression: '0 0 9 * * *',
				timezone: 'Europe/Berlin',
				intervalSeconds: null,
				nextRunAt: dueAt,
			});
			const interval = await createJob({ kind: 'interval', intervalSeconds: 30, nextRunAt: dueAt });
			const oneOff = await createJob({
				kind: 'one_off',
				intervalSeconds: null,
				fireAt,
				nextRunAt: dueAt,
			});

			const claimed = await dataSource.transaction(
				async (trx) => await jobRepository.claimDue(trx, 100),
			);
			expect(claimed).toBeDefined();
			const byId = new Map(claimed!.jobs.map((j) => [j.id, j]));

			expect(byId.get(cron.id)).toMatchObject({
				kind: 'cron',
				cronExpression: '0 0 9 * * *',
				timezone: 'Europe/Berlin',
			});
			expect(byId.get(interval.id)).toMatchObject({ kind: 'interval', intervalSeconds: 30 });
			expect(byId.get(oneOff.id)).toMatchObject({ kind: 'one_off', fireAt });
		});

		// Postgres only: with two transactions open at once, FOR UPDATE SKIP LOCKED must hand
		// each claimer a different job instead of letting both grab the same one. On sqlite
		// this can't be exercised: the single-writer lock won't let two write transactions
		// run at the same time.
		it.skipIf(!isPostgres)(
			'hands disjoint jobs to two claimers with transactions open at once',
			async () => {
				const older = await createJob({ nextRunAt: secondsFromNow(-120) });
				const newer = await createJob({ nextRunAt: secondsFromNow(-60) });

				// runnerB draws from the secondary pool so both transactions can be held open at
				// once; the main pool is capped at a single connection in CI.
				const runnerA = dataSource.createQueryRunner();
				const runnerB = secondaryDataSource!.createQueryRunner();
				try {
					await runnerA.connect();
					await runnerB.connect();
					await runnerA.startTransaction();
					await runnerB.startTransaction();

					// A claims first and holds its row locked; B, running while A is still open,
					// must skip A's row and take the other.
					const claimedA = await jobRepository.claimDue(runnerA.manager, 1);
					const claimedB = await jobRepository.claimDue(runnerB.manager, 1);

					await runnerA.commitTransaction();
					await runnerB.commitTransaction();

					const idsA = claimedA?.jobs.map((j) => j.id) ?? [];
					const idsB = claimedB?.jobs.map((j) => j.id) ?? [];

					expect(idsA).toEqual([older.id]);
					expect(idsB).toEqual([newer.id]);
					expect(idsA.filter((id) => idsB.includes(id))).toHaveLength(0);
				} finally {
					await runnerA.release();
					await runnerB.release();
				}
			},
		);
	});

	describe('ScheduledJobRepository.advanceMany', () => {
		it('persists nextRunAt and lastFiredAt', async () => {
			const job = await createJob({ nextRunAt: secondsFromNow(-60) });
			const nextRunAt = secondsFromNow(3600);
			const lastFiredAt = secondsFromNow(-60);

			await dataSource.transaction(
				async (trx) =>
					await jobRepository.advanceMany(trx, [{ id: job.id, nextRunAt, lastFiredAt }]),
			);

			const reloaded = await jobRepository.findOneByOrFail({ id: job.id });
			expect(reloaded.nextRunAt!.getTime()).toBe(nextRunAt.getTime());
			expect(reloaded.lastFiredAt!.getTime()).toBe(lastFiredAt.getTime());
		});

		it('clears nextRunAt so the job drops out of the due read', async () => {
			const job = await createJob({ nextRunAt: secondsFromNow(-60) });

			await dataSource.transaction(
				async (trx) =>
					await jobRepository.advanceMany(trx, [
						{ id: job.id, nextRunAt: null, lastFiredAt: secondsFromNow(-60) },
					]),
			);

			const reloaded = await jobRepository.findOneByOrFail({ id: job.id });
			expect(reloaded.nextRunAt).toBeNull();

			const claimed = await dataSource.transaction(
				async (trx) => await jobRepository.claimDue(trx, 100),
			);
			expect(claimed).toBeUndefined();
		});

		it('advances a batch larger than the chunk size across multiple statements', async () => {
			const jobs = await Promise.all(
				Array.from({ length: 5 }, async () => await createJob({ nextRunAt: secondsFromNow(-60) })),
			);
			const nextRunAt = secondsFromNow(3600);
			const advances = jobs.map((job) => ({
				id: job.id,
				nextRunAt,
				lastFiredAt: null,
			}));

			// 5 advances at 2/chunk forces three statements, exercising the loop.
			await dataSource.transaction(
				async (trx) => await jobRepository.advanceMany(trx, advances, 2),
			);

			for (const job of jobs) {
				const reloaded = await jobRepository.findOneByOrFail({ id: job.id });
				expect(reloaded.nextRunAt!.getTime()).toBe(nextRunAt.getTime());
			}
		});

		it('advances a batch larger than the default chunk without overflowing', async () => {
			// insertMany seeds the rows in bulk; the default advanceMany chunk on sqlite is 200,
			// so 600 advances span multiple chunks. Built as one statement, the CASE would overflow
			// SQLite's expression-depth cap, so this guards the dialect-aware chunk default.
			const ids = await dataSource.transaction(
				async (trx) =>
					await jobRepository.insertMany(
						trx,
						Array.from({ length: 600 }, (_, i) => newJobRow(`wf:node:${i}`)),
					),
			);
			const nextRunAt = secondsFromNow(3600);

			await dataSource.transaction(
				async (trx) =>
					await jobRepository.advanceMany(
						trx,
						ids.map((id) => ({ id, nextRunAt, lastFiredAt: null })),
					),
			);

			const reloaded = await jobRepository.findBy({ id: In(ids) });
			expect(reloaded).toHaveLength(600);
			expect(reloaded.every((row) => row.nextRunAt?.getTime() === nextRunAt.getTime())).toBe(true);
		});

		it('clamps an oversized chunk size to the dialect maximum', async () => {
			const ids = await dataSource.transaction(
				async (trx) =>
					await jobRepository.insertMany(
						trx,
						Array.from({ length: 600 }, (_, i) => newJobRow(`wf:node:${i}`)),
					),
			);
			const nextRunAt = secondsFromNow(3600);

			// A chunk far past the driver's limit must be clamped, not run as one statement: on
			// sqlite an unclamped 600-branch CASE would overflow the expression-depth cap.
			await dataSource.transaction(
				async (trx) =>
					await jobRepository.advanceMany(
						trx,
						ids.map((id) => ({ id, nextRunAt, lastFiredAt: null })),
						10_000_000,
					),
			);

			const reloaded = await jobRepository.findBy({ id: In(ids) });
			expect(reloaded).toHaveLength(600);
			expect(reloaded.every((row) => row.nextRunAt?.getTime() === nextRunAt.getTime())).toBe(true);
		});
	});

	describe('ScheduledJobRepository.insertMany', () => {
		it('inserts new rows and returns one id per input job, in input order', async () => {
			const jobs = [newJobRow('wf:node:0'), newJobRow('wf:node:1')];

			const ids = await dataSource.transaction(
				async (trx) => await jobRepository.insertMany(trx, jobs),
			);

			expect(ids).toHaveLength(2);
			// The returned ids must line up with the input order by name, so the caller's
			// index-based zip attributes each id to the right job.
			const stored = await jobRepository.findBy({ name: In(['wf:node:0', 'wf:node:1']) });
			const idByName = new Map(stored.map((row) => [row.name, row.id]));
			expect(ids).toEqual([idByName.get('wf:node:0'), idByName.get('wf:node:1')]);
		});

		it('returns the existing id for a name already taken, without duplicating the row', async () => {
			// A prior writer already holds `wf:node:0`; a second provisioning run inserts it
			// again alongside a fresh name. orIgnore skips the taken row, and the read-back by
			// name still yields the taken row's id rather than a gap.
			const [firstId] = await dataSource.transaction(
				async (trx) => await jobRepository.insertMany(trx, [newJobRow('wf:node:0')]),
			);

			const ids = await dataSource.transaction(
				async (trx) =>
					await jobRepository.insertMany(trx, [newJobRow('wf:node:0'), newJobRow('wf:node:1')]),
			);

			expect(ids[0]).toBe(firstId);
			expect(ids[1]).not.toBe(firstId);
			// Only one row named `wf:node:0`: the second insert converged on the first's row.
			expect(await jobRepository.countBy({ name: 'wf:node:0' })).toBe(1);
			expect(await jobRepository.countBy({ name: 'wf:node:1' })).toBe(1);
		});

		// Postgres only: two transactions inserting the same name at once. The unique index
		// lets exactly one row win; both callers read the winner's id back by name rather than
		// the loser getting a gap from the skipped RETURNING row.
		//
		// runnerB draws from the secondary pool so both transactions are genuinely held open at
		// once (the main pool is capped at a single connection in CI). A inserts and holds the
		// new row's uncommitted unique-index entry; B's insert of the same name blocks on it
		// until A commits, then `orIgnore` skips and B reads A's row back by name.
		it.skipIf(!isPostgres)(
			'converges on a single row when two transactions insert the same name at once',
			async () => {
				const runnerA = dataSource.createQueryRunner();
				const runnerB = secondaryDataSource!.createQueryRunner();
				let first: number[];
				let second: number[];
				try {
					await runnerA.connect();
					await runnerB.connect();
					await runnerA.startTransaction();
					await runnerB.startTransaction();

					first = await jobRepository.insertMany(runnerA.manager, [newJobRow('wf:node:0')]);

					// Start B's insert while A's transaction is still open; it blocks on A's
					// uncommitted row, so don't await it until A has committed.
					const secondPromise = jobRepository.insertMany(runnerB.manager, [newJobRow('wf:node:0')]);
					await runnerA.commitTransaction();
					second = await secondPromise;
					await runnerB.commitTransaction();
				} finally {
					// Free the runners (runnerA holds the single main-pool connection) before the
					// assertions below query through the main DataSource.
					await runnerA.release();
					await runnerB.release();
				}

				expect(await jobRepository.countBy({ name: 'wf:node:0' })).toBe(1);
				const stored = await jobRepository.findOneByOrFail({ name: 'wf:node:0' });
				// Neither caller came back empty; both point at the surviving row.
				expect(first).toEqual([stored.id]);
				expect(second).toEqual([stored.id]);
			},
		);

		it('rejects a call made outside a transaction', async () => {
			// The plain DataSource manager has no queryRunner, which is how the guard detects
			// a call made outside `dataSource.transaction`.
			await expect(
				jobRepository.insertMany(dataSource.manager, [newJobRow('wf:node:0')]),
			).rejects.toThrow('insertMany must run within a transaction');

			expect(await jobRepository.countBy({ name: 'wf:node:0' })).toBe(0);
		});

		it('inserts and reads back a batch larger than both chunk sizes', async () => {
			// 1500 jobs spans two insert chunks (1000) and, on sqlite, three read-back chunks
			// (500). A single read-back `name IN (...)` this long would overflow SQLite's
			// expression-depth cap, so this guards the chunked read-back.
			const jobs = Array.from({ length: 1500 }, (_, i) => newJobRow(`wf:node:${i}`));

			const ids = await dataSource.transaction(
				async (trx) => await jobRepository.insertMany(trx, jobs),
			);

			expect(ids).toHaveLength(1500);
			// Every job got a distinct id back: no name was dropped or duplicated by the chunking.
			expect(new Set(ids).size).toBe(1500);
			expect(await jobRepository.count()).toBe(1500);
			// Spot-check that ids come back in input order: index i belongs to that job's name.
			for (const i of [0, 750, 1499]) {
				const stored = await jobRepository.findOneByOrFail({ name: `wf:node:${i}` });
				expect(ids[i]).toBe(stored.id);
			}
		});
	});

	describe('ScheduledJobRepository.updateMisfirePolicy', () => {
		it('rewrites the policy and grace of the given jobs only', async () => {
			const updated = await createJob({
				misfirePolicy: ScheduledJobMisfirePolicy.Coalesce,
				misfireGraceSeconds: 60,
			});
			const untouched = await createJob({
				misfirePolicy: ScheduledJobMisfirePolicy.Coalesce,
				misfireGraceSeconds: 60,
			});

			await dataSource.transaction(
				async (trx) =>
					await jobRepository.updateMisfirePolicy(trx, [updated.id], {
						misfirePolicy: ScheduledJobMisfirePolicy.Skip,
						misfireGraceSeconds: 120,
					}),
			);

			const after = await jobRepository.findOneByOrFail({ id: updated.id });
			expect(after.misfirePolicy).toBe(ScheduledJobMisfirePolicy.Skip);
			expect(after.misfireGraceSeconds).toBe(120);
			expect(after.intervalSeconds).toBe(updated.intervalSeconds);
			expect(after.nextRunAt).toEqual(updated.nextRunAt);

			const other = await jobRepository.findOneByOrFail({ id: untouched.id });
			expect(other.misfirePolicy).toBe(ScheduledJobMisfirePolicy.Coalesce);
			expect(other.misfireGraceSeconds).toBe(60);
		});

		it('leaves the queued occurrences of an updated job in place', async () => {
			const job = await createJob();
			await createTask(job.id);

			await dataSource.transaction(
				async (trx) =>
					await jobRepository.updateMisfirePolicy(trx, [job.id], {
						misfirePolicy: ScheduledJobMisfirePolicy.Skip,
						misfireGraceSeconds: 60,
					}),
			);

			expect(await taskRepository.countBy({ jobId: job.id })).toBe(1);
		});

		it('does nothing when given no jobs', async () => {
			const job = await createJob();

			await dataSource.transaction(
				async (trx) =>
					await jobRepository.updateMisfirePolicy(trx, [], {
						misfirePolicy: ScheduledJobMisfirePolicy.Skip,
						misfireGraceSeconds: 120,
					}),
			);

			const after = await jobRepository.findOneByOrFail({ id: job.id });
			expect(after.misfirePolicy).toBe(ScheduledJobMisfirePolicy.Coalesce);
		});
	});

	describe('ScheduledJobRepository.findQuarantinedByOwnerIds', () => {
		it('returns at most `limit` jobs', async () => {
			const owner = workflowOwned('wf-quarantined', 'node');
			for (let i = 0; i < 3; i++) {
				await createJob({ ...owner, ownerMemberId: `node-${i}`, orphanedAt: new Date() });
			}

			const found = await jobRepository.findQuarantinedByOwnerIds(
				owner.ownerType,
				[owner.ownerId],
				2,
			);

			expect(found).toHaveLength(2);
		});
	});

	describe('ScheduledJobRepository.liftQuarantineByOwner', () => {
		it('rejects a call made outside a transaction', async () => {
			const owner = workflowOwned('wf-lift', 'node');
			const job = await createJob({ ...owner, enabled: false, orphanedAt: new Date() });

			await expect(jobRepository.liftQuarantineByOwner(dataSource.manager, owner)).rejects.toThrow(
				'liftQuarantineByOwner must run within a transaction',
			);

			expect(await jobRepository.findOneByOrFail({ id: job.id })).toMatchObject({
				enabled: false,
			});
		});

		it('clears the stamp and leaves enabled as it was', async () => {
			const owner = workflowOwned('wf-lift-disabled', 'node');
			const job = await createJob({ ...owner, enabled: false, orphanedAt: new Date() });

			const lifted = await dataSource.transaction(
				async (trx) => await jobRepository.liftQuarantineByOwner(trx, owner),
			);

			expect(lifted).toBe(1);
			expect(await jobRepository.findOneByOrFail({ id: job.id })).toMatchObject({
				enabled: false,
				orphanedAt: null,
			});
		});
	});

	describe('ScheduledTaskRepository.insertIgnoringDuplicates', () => {
		it('inserts occurrences and returns how many were recorded', async () => {
			const job = await createJob();
			const scheduledFor = secondsFromNow(-60);

			const result = await dataSource.transaction(
				async (trx) =>
					await taskRepository.insertIgnoringDuplicates(trx, [
						{
							jobId: job.id,
							taskType: 'scheduleTrigger',
							payload: { foo: 'bar' },
							scheduledFor,
							runAt: scheduledFor,
							maxAttempts: 1,
						},
					]),
			);

			expect(result.recorded).toBe(1);
			const stored = await taskRepository.findBy({ jobId: job.id });
			expect(stored).toHaveLength(1);
			expect(stored[0].scheduledFor.getTime()).toBe(scheduledFor.getTime());
		});

		// Postgres only: SQLite's driver never surfaces RETURNING rows from a raw
		// insert, so row identity for tracing is a Postgres-only capability.
		it.skipIf(!isPostgres)('returns the identity of each newly created row', async () => {
			const job = await createJob();
			const scheduledFor = secondsFromNow(-60);

			const result = await dataSource.transaction(
				async (trx) =>
					await taskRepository.insertIgnoringDuplicates(trx, [
						{
							jobId: job.id,
							taskType: 'scheduleTrigger',
							payload: {},
							scheduledFor,
							runAt: scheduledFor,
							maxAttempts: 1,
						},
					]),
			);

			expect(result.created).toHaveLength(1);
			const stored = await taskRepository.findOneByOrFail({ jobId: job.id });
			expect(result.created[0]).toEqual({
				id: stored.id,
				jobId: job.id,
				taskType: 'scheduleTrigger',
			});
		});

		it('is idempotent on (jobId, scheduledFor): a duplicate is skipped and not counted', async () => {
			const job = await createJob();
			const scheduledFor = secondsFromNow(-60);
			const occurrence = {
				jobId: job.id,
				taskType: 'scheduleTrigger',
				payload: {},
				scheduledFor,
				runAt: scheduledFor,
				maxAttempts: 1,
			};

			const first = await dataSource.transaction(
				async (trx) => await taskRepository.insertIgnoringDuplicates(trx, [occurrence]),
			);
			const second = await dataSource.transaction(
				async (trx) => await taskRepository.insertIgnoringDuplicates(trx, [occurrence]),
			);

			expect(first.recorded).toBe(1);
			expect(second.recorded).toBe(0);
			expect(await taskRepository.findBy({ jobId: job.id })).toHaveLength(1);
		});

		it('inserts a batch larger than the chunk size across multiple statements', async () => {
			const job = await createJob();
			const base = secondsFromNow(-5000);
			// 2500 rows forces three chunks at the default 1000/chunk, exercising the loop.
			const occurrences = Array.from({ length: 2500 }, (_, i) => {
				const when = new Date(base.getTime() + i * 1000);
				return {
					jobId: job.id,
					taskType: 'scheduleTrigger',
					payload: {},
					scheduledFor: when,
					runAt: when,
					maxAttempts: 1,
				};
			});

			const result = await dataSource.transaction(
				async (trx) => await taskRepository.insertIgnoringDuplicates(trx, occurrences),
			);

			expect(result.recorded).toBe(2500);
			expect(await taskRepository.countBy({ jobId: job.id })).toBe(2500);
		});

		// Postgres only: two transactions inserting the same (jobId, scheduledFor) at once.
		// The unique index lets exactly one win; the other's ON CONFLICT DO NOTHING records 0.
		it.skipIf(!isPostgres)(
			'records a single row when two transactions insert the same occurrence at once',
			async () => {
				const job = await createJob();
				const scheduledFor = secondsFromNow(-60);
				const occurrence = {
					jobId: job.id,
					taskType: 'scheduleTrigger',
					payload: {},
					scheduledFor,
					runAt: scheduledFor,
					maxAttempts: 1,
				};

				const [first, second] = await Promise.all([
					dataSource.transaction(
						async (trx) => await taskRepository.insertIgnoringDuplicates(trx, [occurrence]),
					),
					dataSource.transaction(
						async (trx) => await taskRepository.insertIgnoringDuplicates(trx, [occurrence]),
					),
				]);

				expect(first.recorded + second.recorded).toBe(1);
				expect(await taskRepository.findBy({ jobId: job.id })).toHaveLength(1);
			},
		);
	});

	describe('ScheduledTaskRepository.deleteFinishedOlderThan', () => {
		const HOUR_MS = 60 * 60 * 1000;

		it('deletes only rows in the given statuses finished before the cutoff', async () => {
			const job = await createJob();
			await createTask(job.id, { status: 'succeeded', finishedAt: secondsFromNow(-7200) });
			await createTask(job.id, { status: 'cancelled', finishedAt: secondsFromNow(-7200) });
			const freshSucceeded = await createTask(job.id, {
				status: 'succeeded',
				finishedAt: secondsFromNow(-60),
			});
			const oldFailed = await createTask(job.id, {
				status: 'failed',
				finishedAt: secondsFromNow(-7200),
			});
			const pending = await createTask(job.id, { status: 'pending' });
			const running = await createTask(job.id, {
				status: 'running',
				claimedBy: 'main-1',
				leaseExpiresAt: secondsFromNow(-7200),
			});

			const deleted = await taskRepository.deleteFinishedOlderThan({
				statuses: ['succeeded', 'cancelled'],
				olderThanMs: HOUR_MS,
				limit: 100,
			});

			// Both expired clean rows went; the fresh one, other statuses, and
			// live rows (no finishedAt) survived.
			expect(deleted).toBe(2);
			const survivors = new Set((await taskRepository.find()).map((t) => t.id));
			expect(survivors).toEqual(new Set([freshSucceeded.id, oldFailed.id, pending.id, running.id]));
		});

		it('deletes the oldest rows first when the limit caps a batch', async () => {
			const job = await createJob();
			await createTask(job.id, { status: 'succeeded', finishedAt: secondsFromNow(-4 * 3600) });
			await createTask(job.id, { status: 'succeeded', finishedAt: secondsFromNow(-3 * 3600) });
			const youngest = await createTask(job.id, {
				status: 'succeeded',
				finishedAt: secondsFromNow(-2 * 3600),
			});

			const deleted = await taskRepository.deleteFinishedOlderThan({
				statuses: ['succeeded'],
				olderThanMs: HOUR_MS,
				limit: 2,
			});

			expect(deleted).toBe(2);
			const remaining = await taskRepository.find();
			expect(remaining.map((t) => t.id)).toEqual([youngest.id]);
		});

		it('never deletes a terminal row missing finishedAt', async () => {
			const job = await createJob();
			// Transitions always set finishedAt; a row without it has no provable
			// age, so retention must leave it alone rather than guess.
			const untimed = await createTask(job.id, { status: 'succeeded', finishedAt: null });

			const deleted = await taskRepository.deleteFinishedOlderThan({
				statuses: ['succeeded'],
				olderThanMs: 0,
				limit: 100,
			});

			expect(deleted).toBe(0);
			expect((await taskRepository.find()).map((t) => t.id)).toEqual([untimed.id]);
		});

		it('deletes nothing when no statuses are given', async () => {
			const job = await createJob();
			await createTask(job.id, { status: 'succeeded', finishedAt: secondsFromNow(-7200) });

			const deleted = await taskRepository.deleteFinishedOlderThan({
				statuses: [],
				olderThanMs: HOUR_MS,
				limit: 100,
			});

			expect(deleted).toBe(0);
			expect(await taskRepository.count()).toBe(1);
		});

		it('rejects live statuses before touching any row', async () => {
			const job = await createJob();
			const oldPending = await createTask(job.id, { status: 'pending' });

			// The type already forbids this; the cast simulates a value smuggled
			// past it (an untyped caller), which the runtime guard must stop.
			await expect(
				taskRepository.deleteFinishedOlderThan({
					statuses: ['pending' as TerminalTaskStatus, 'succeeded'],
					olderThanMs: 0,
					limit: 100,
				}),
			).rejects.toThrow('only deletes terminal tasks, got: pending');
			expect((await taskRepository.find()).map((t) => t.id)).toEqual([oldPending.id]);
		});

		it('rejects a non-integer limit before touching any row', async () => {
			const job = await createJob();
			await createTask(job.id, { status: 'succeeded', finishedAt: secondsFromNow(-7200) });

			await expect(
				taskRepository.deleteFinishedOlderThan({
					statuses: ['succeeded'],
					olderThanMs: HOUR_MS,
					limit: 1.5,
				}),
			).rejects.toThrow('needs an integer limit, got: 1.5');
			expect(await taskRepository.count()).toBe(1);
		});

		it('treats a non-positive limit as a no-op batch', async () => {
			const job = await createJob();
			await createTask(job.id, { status: 'succeeded', finishedAt: secondsFromNow(-7200) });

			const deleted = await taskRepository.deleteFinishedOlderThan({
				statuses: ['succeeded'],
				olderThanMs: HOUR_MS,
				limit: 0,
			});

			expect(deleted).toBe(0);
			expect(await taskRepository.count()).toBe(1);
		});

		// Postgres only: while another transaction holds eligible rows locked,
		// FOR UPDATE SKIP LOCKED must hand the concurrent batch the remaining rows
		// instead of blocking on (or double-deleting) the locked ones. On sqlite
		// the single-writer lock serializes the two, so there is nothing to skip.
		it.skipIf(!isPostgres)(
			'skips rows another transaction holds locked and deletes the rest',
			async () => {
				const job = await createJob();
				const lockedOlder = await createTask(job.id, {
					status: 'succeeded',
					finishedAt: secondsFromNow(-4 * 3600),
				});
				const lockedNewer = await createTask(job.id, {
					status: 'succeeded',
					finishedAt: secondsFromNow(-3 * 3600),
				});
				await createTask(job.id, {
					status: 'succeeded',
					finishedAt: secondsFromNow(-2 * 3600),
				});

				// The holder draws from the secondary pool so its transaction stays
				// open while the delete runs on the main pool.
				const runner = secondaryDataSource!.createQueryRunner();
				try {
					await runner.connect();
					await runner.startTransaction();
					await runner.manager
						.getRepository(ScheduledTask)
						.createQueryBuilder('task')
						.setLock('pessimistic_write')
						.whereInIds([lockedOlder.id, lockedNewer.id])
						.getMany();

					const deleted = await taskRepository.deleteFinishedOlderThan({
						statuses: ['succeeded'],
						olderThanMs: HOUR_MS,
						limit: 10,
					});

					// Only the unlocked row went, even though the locked ones are older.
					expect(deleted).toBe(1);
					const survivors = new Set((await taskRepository.find()).map((t) => t.id));
					expect(survivors).toEqual(new Set([lockedOlder.id, lockedNewer.id]));

					await runner.rollbackTransaction();
				} finally {
					await runner.release();
				}

				// With the lock released, the next batch reaps what was skipped.
				const rest = await taskRepository.deleteFinishedOlderThan({
					statuses: ['succeeded'],
					olderThanMs: HOUR_MS,
					limit: 10,
				});
				expect(rest).toBe(2);
				expect(await taskRepository.count()).toBe(0);
			},
		);
	});

	describe('ScheduledTaskRepository.getMetricSnapshot', () => {
		it('reports queue depth counts and the oldest due pending age', async () => {
			const job = await createJob();
			const now = new Date();

			// Two due pending rows (runAt in the past) and one not-yet-due pending row.
			const dueOld = await createTask(job.id, {
				status: 'pending',
				runAt: new Date(now.getTime() - 120_000),
			});
			await createTask(job.id, { status: 'pending', runAt: new Date(now.getTime() - 30_000) });
			await createTask(job.id, { status: 'pending', runAt: new Date(now.getTime() + 3_600_000) });
			// A running row, plus terminal rows that must not be counted.
			await createTask(job.id, {
				status: 'running',
				claimedBy: 'main-1',
				leaseExpiresAt: new Date(now.getTime() + 60_000),
			});
			await createTask(job.id, { status: 'succeeded', finishedAt: secondsFromNow(-60) });
			await createTask(job.id, { status: 'failed', finishedAt: secondsFromNow(-60) });

			const snapshot = await taskRepository.getMetricSnapshot();

			expect(snapshot.pending).toBe(3); // both due rows plus the future one
			expect(snapshot.due).toBe(2); // only the two past-runAt rows are actionable
			expect(snapshot.running).toBe(1);
			// Lag tracks the oldest DUE pending row, not the future one. Measured against
			// DB-now, so it's at least the row's age at seed time, plus the small elapsed
			// time until the query ran.
			const seededAgeMs = now.getTime() - dueOld.runAt.getTime();
			expect(snapshot.oldestPendingAgeMs).toBeGreaterThanOrEqual(seededAgeMs);
			expect(snapshot.oldestPendingAgeMs).toBeLessThan(seededAgeMs + 60_000);
		});

		it('returns a null oldest age when no pending row is due', async () => {
			const job = await createJob();
			const now = new Date();

			await createTask(job.id, { status: 'pending', runAt: new Date(now.getTime() + 3_600_000) });
			await createTask(job.id, {
				status: 'running',
				claimedBy: 'main-1',
				leaseExpiresAt: new Date(now.getTime() + 60_000),
			});

			const snapshot = await taskRepository.getMetricSnapshot();

			expect(snapshot.pending).toBe(1);
			expect(snapshot.due).toBe(0);
			expect(snapshot.running).toBe(1);
			expect(snapshot.oldestPendingAgeMs).toBeNull();
		});

		it('reports all-zero counts and a null age on an empty queue', async () => {
			const snapshot = await taskRepository.getMetricSnapshot();

			expect(snapshot).toEqual({ pending: 0, due: 0, running: 0, oldestPendingAgeMs: null });
		});
	});
});