import { INestApplication, Logger } from '@nestjs/common';
import * as bcrypt from 'bcryptjs';
import request from 'supertest';
import { App } from 'supertest/types';
import { PrismaService } from '../src/prisma/prisma.service';
import { NotificationsService } from '../src/notifications/notifications.service';
import { CalendarSyncSettingsService } from '../src/calendar-sync/calendar-sync-settings.service';
import { AutomationService } from '../src/automation/automation.service';
import { AutomationTriggerType, Prisma } from '../generated/prisma';
import { createTestApp } from './utils/create-test-app';
import { login } from './utils/api';
import { drainDomainEvents } from './utils/domain-events';

/**
 * Side effects of a committed write (automation rules, calendar sync,
 * webhooks) must never turn that write into an error response: the offline
 * queue would send the request again and store the record twice - for
 * treatments that is a duplicate entry in the Bestandsbuch. Producers that
 * record a domain event run none of them in the request; the handlers do,
 * and a failed handler is retried without repeating what already worked.
 */
describe('Post-commit side effects (e2e)', () => {
  let app: INestApplication<App>;
  let prisma: PrismaService;
  const suffix = `${Date.now()}-${Math.round(Math.random() * 1e6)}`;
  const email = `post-commit-e2e-${suffix}@example.com`;
  const password = 'SuperSecret123!';
  let token: string;
  let userId: string;
  let apiaryId: string;
  const colonyIds: string[] = [];
  const stockItemIds: string[] = [];

  const server = () => app.getHttpServer();
  const auth = () => ({ Authorization: `Bearer ${token}` });

  function post(path: string, body: object, idempotencyKey?: string) {
    const call = request(server()).post(path).set(auth());
    return (
      idempotencyKey === undefined
        ? call
        : call.set('Idempotency-Key', idempotencyKey)
    ).send(body);
  }

  async function createColony(code: string) {
    const colony = await prisma.colony.create({
      data: {
        code: `${code}-${suffix}`,
        apiaryId,
        colonyType: 'PRODUCTION_COLONY',
      },
    });
    colonyIds.push(colony.id);
    return colony;
  }

  /** Open or not: a rule suggestion that exists at all. */
  const suggestionCount = (ruleKey: AutomationTriggerType, relatedId: string) =>
    prisma.suggestion.count({ where: { ruleKey, relatedId } });

  const openSuggestionCount = (
    ruleKey: AutomationTriggerType,
    relatedId: string,
  ) =>
    prisma.suggestion.count({
      where: { ruleKey, relatedId, status: 'OPEN' },
    });

  /** The notifications written for the suggestions of the given objects. */
  async function suggestionNotifications(relatedIds: string[]) {
    const ids = (
      await prisma.suggestion.findMany({
        where: { relatedId: { in: relatedIds } },
        select: { id: true },
      })
    ).map((suggestion) => suggestion.id);
    return prisma.notification.findMany({
      where: { relatedType: 'Suggestion', relatedId: { in: ids } },
      select: { userId: true },
    });
  }

  /** Everything this file wrote, scoped by its own ids. */
  async function cleanUp(): Promise<void> {
    const byColony = {
      where: { colonyId: { in: colonyIds } },
      select: { id: true },
    };
    const recordIds = (
      await Promise.all([
        prisma.inspection.findMany(byColony),
        prisma.treatment.findMany(byColony),
        prisma.varroaMeasurement.findMany(byColony),
      ])
    )
      .flat()
      .map((record) => record.id);
    const relatedIds = [...colonyIds, ...stockItemIds];
    const suggestionIds = (
      await prisma.suggestion.findMany({
        where: { relatedId: { in: relatedIds } },
        select: { id: true },
      })
    ).map((suggestion) => suggestion.id);
    const aggregateIds = recordIds;
    // Deliveries go with their event (ON DELETE CASCADE).
    await prisma.domainEvent.deleteMany({
      where: { aggregateId: { in: aggregateIds } },
    });
    await prisma.calendarSyncOutboxEntry.deleteMany({
      where: { sourceId: { in: aggregateIds } },
    });
    // Rule suggestions and the rules' own entries are written without a user.
    await prisma.auditLog.deleteMany({
      where: {
        OR: [
          { userId },
          { entityType: 'Suggestion', entityId: { in: suggestionIds } },
          ...relatedIds.map((relatedId) => ({
            entityType: 'AutomationRule',
            afterData: { path: ['relatedId'], equals: relatedId },
          })),
        ],
      },
    });
    await prisma.notification.deleteMany({
      where: { relatedType: 'Suggestion', relatedId: { in: suggestionIds } },
    });
    await prisma.suggestion.deleteMany({
      where: { id: { in: suggestionIds } },
    });
    await prisma.inspection.deleteMany({ where: byColony.where });
    await prisma.treatment.deleteMany({ where: byColony.where });
    await prisma.varroaMeasurement.deleteMany({ where: byColony.where });
    await prisma.stockItem.deleteMany({ where: { id: { in: stockItemIds } } });
    await prisma.colony.deleteMany({ where: { id: { in: colonyIds } } });
    await prisma.apiary.deleteMany({ where: { id: apiaryId } });
    await prisma.idempotencyRecord.deleteMany({ where: { userId } });
    await prisma.refreshToken.deleteMany({ where: { userId } });
    await prisma.user.deleteMany({ where: { id: userId } });
  }

  beforeAll(async () => {
    app = await createTestApp();
    prisma = app.get(PrismaService);
    userId = (
      await prisma.user.create({
        data: {
          email,
          passwordHash: await bcrypt.hash(password, 12),
          name: 'Post Commit',
          role: { connect: { key: 'ADMIN' } },
        },
      })
    ).id;
    token = (await login(app, email, password)).accessToken;
    apiaryId = (
      await prisma.apiary.create({ data: { name: `Post Commit ${suffix}` } })
    ).id;
  });

  afterEach(() => {
    jest.restoreAllMocks();
  });

  afterAll(async () => {
    await cleanUp();
    await app.close();
  });

  describe('when a side effect fails', () => {
    let errorLog: jest.SpyInstance;

    /** The error lines the automation's legacy path logged for one record. */
    const automationFailuresFor = (entityType: string, entityId: string) =>
      errorLog.mock.calls
        .map(([message]) => String(message))
        .filter((message) =>
          message.startsWith(
            `Automation rule evaluation failed for ${entityType} ${entityId}:`,
          ),
        );

    /**
     * Every transaction still runs for real, but inside it the seeding of
     * the automation rules (ensureDefaults → tx.automationRule.createMany)
     * fails: the first write of every rule evaluation. A rule evaluated
     * inside the request's own transaction would turn it into a 500.
     */
    function failRuleSeedingInTransactions(): void {
      type Work = (tx: Prisma.TransactionClient) => Promise<unknown>;
      const runTransaction = prisma.$transaction.bind(prisma) as (
        work: Work,
        options?: unknown,
      ) => Promise<unknown>;
      const failingRules = (rules: object) =>
        new Proxy(rules, {
          get: (target, property): unknown =>
            property === 'createMany'
              ? () => Promise.reject(new Error('automation rules down'))
              : Reflect.get(target, property),
        });
      const withFailingRuleSeeding = (tx: Prisma.TransactionClient) =>
        new Proxy(tx, {
          get: (target, property): unknown =>
            property === 'automationRule'
              ? failingRules(target.automationRule)
              : Reflect.get(target, property),
        });
      jest
        .spyOn(prisma, '$transaction')
        .mockImplementation((work: unknown, options?: unknown) =>
          typeof work === 'function'
            ? runTransaction(
                (tx) => (work as Work)(withFailingRuleSeeding(tx)),
                options,
              )
            : runTransaction(work as Work, options),
        );
    }

    beforeEach(() => {
      errorLog = jest
        .spyOn(Logger.prototype, 'error')
        .mockImplementation(() => undefined);
      // Automation: the warning cannot be written.
      jest
        .spyOn(app.get(NotificationsService), 'recordForPermission')
        .mockRejectedValue(new Error('notifications down'));
      // Calendar sync: enqueue cannot read its settings.
      jest
        .spyOn(app.get(CalendarSyncSettingsService), 'get')
        .mockRejectedValue(new Error('calendar settings down'));
      // Webhooks: the subscriptions cannot be loaded.
      jest
        .spyOn(prisma.webhookSubscription, 'findMany')
        .mockRejectedValue(new Error('webhook subscriptions down'));
    });

    it('still answers 201 and replays on retry with the same Idempotency-Key (no side effect in the request)', async () => {
      const colony = await createColony('PC-INSP');
      const key = `post-commit-${suffix}-inspection`;
      const body = {
        colonyId: colony.id,
        date: '2026-07-01T00:00:00.000Z',
        queenSeen: false,
        eggsPresent: false,
      };

      const first = await post('/api/v1/inspections', body, key).expect(201);
      const retry = await post('/api/v1/inspections', body, key).expect(201);

      const inspectionId = (first.body as { id: string }).id;
      expect((retry.body as { id: string }).id).toBe(inspectionId);
      expect(
        await prisma.inspection.count({ where: { colonyId: colony.id } }),
      ).toBe(1);
      // The request only recorded its event - the replay not even that.
      const events = await prisma.domainEvent.findMany({
        where: { aggregateId: inspectionId },
      });
      expect(events).toEqual([
        expect.objectContaining({
          type: 'InspectionRecorded',
          status: 'PENDING',
          attempts: 0,
        }),
      ]);
      // No rule ran in the request, not even one that failed: the suggestion
      // follows when the handler runs.
      expect(automationFailuresFor('Inspection', inspectionId)).toEqual([]);
      expect(await suggestionCount('QUEENLESS_NO_EGGS', colony.id)).toBe(0);
      expect(await suggestionNotifications([colony.id])).toEqual([]);
    });

    it('still answers 201 for a treatment when the rule evaluation would fail, and replays it', async () => {
      failRuleSeedingInTransactions();
      const colony = await createColony('PC-TREAT');
      const key = `post-commit-${suffix}-treatment`;
      const body = {
        colonyId: colony.id,
        date: '2026-08-01T00:00:00.000Z',
        product: 'Oxalsäure',
      };

      const first = await post('/api/v1/treatments', body, key).expect(201);
      const retry = await post('/api/v1/treatments', body, key).expect(201);

      expect((retry.body as { id: string }).id).toBe(
        (first.body as { id: string }).id,
      );
      expect(
        await prisma.treatment.count({ where: { colonyId: colony.id } }),
      ).toBe(1);
    });
  });

  describe('when an automation handler fails', () => {
    it('creates exactly one automation suggestion when the handler fails once and is retried', async () => {
      jest.spyOn(Logger.prototype, 'warn').mockImplementation(() => undefined);
      const colonyId = (await createColony('PC-RETRY')).id;
      jest
        .spyOn(app.get(NotificationsService), 'recordForPermission')
        .mockRejectedValueOnce(new Error('notifications down'));

      const { body } = (await post('/api/v1/inspections', {
        colonyId,
        date: '2026-07-01T00:00:00.000Z',
        queenSeen: false,
        eggsPresent: false,
      }).expect(201)) as { body: { id: string } };

      await drainDomainEvents(app, [body.id]);
      // The warning failed, so the whole evaluation rolled back.
      expect(await suggestionCount('QUEENLESS_NO_EGGS', colonyId)).toBe(0);
      expect(await suggestionNotifications([colonyId])).toEqual([]);

      // Due again now instead of after the 30 s backoff.
      await prisma.$executeRaw`UPDATE "DomainEvent" SET "availableAt" = now() WHERE "aggregateId" = ${body.id}`;
      await drainDomainEvents(app, [body.id]);
      expect(await suggestionCount('QUEENLESS_NO_EGGS', colonyId)).toBe(1);
      // One copy per recipient (everybody who may read tasks and
      // inspections), written once.
      const warnings = await suggestionNotifications([colonyId]);
      expect(warnings.length).toBeGreaterThan(0);
      expect(new Set(warnings.map((w) => w.userId)).size).toBe(warnings.length);

      const deliveries = await prisma.domainEventDelivery.findMany({
        where: { event: { aggregateId: body.id } },
      });
      expect(
        deliveries.find((d) => d.handler === 'automation.inspection-rules'),
      ).toMatchObject({ status: 'DONE', attempts: 2 });
      // What already worked did not run again.
      expect(
        deliveries.find((d) => d.handler === 'webhooks.forward'),
      ).toMatchObject({ status: 'DONE', attempts: 1 });
      await expect(
        prisma.domainEvent.findFirstOrThrow({
          where: { aggregateId: body.id },
        }),
      ).resolves.toMatchObject({ status: 'DONE', attempts: 1 });
    });
  });

  describe('automation suggestions', () => {
    it('leaves one open reorder suggestion when several triggers for the same stock item arrive at once', async () => {
      const automation = app.get(AutomationService);
      // The same object crossing the threshold on several pods/requests at
      // once: every evaluation sees "nothing open yet" unless checking and
      // creating are serialised.
      const item = await prisma.stockItem.create({
        data: {
          name: `Race ${suffix}`,
          category: 'CONSUMABLE',
          unit: 'Stück',
          quantity: 1,
          minThreshold: 5,
        },
      });
      stockItemIds.push(item.id);

      await Promise.all(
        Array.from({ length: 8 }, () => automation.evaluateStockItem(item)),
      );

      expect(await openSuggestionCount('STOCK_ITEM_LOW', item.id)).toBe(1);
    });

    it('leaves one open suggestion when several triggers for the same colony arrive at once', async () => {
      const colony = await createColony('PC-RACE');
      const measurement = {
        colonyId: colony.id,
        date: '2026-08-15T00:00:00.000Z',
        method: 'NATURAL_MITE_FALL',
        miteCount: 20,
        // One day on the board: 20 mites per day, above the default 10.
        durationMinutes: 24 * 60,
      };

      const responses = await Promise.all(
        Array.from({ length: 6 }, () =>
          post('/api/v1/varroa-measurements', measurement).expect(201),
        ),
      );
      // One worker each: the handlers evaluate the rule at the same moment.
      await Promise.all(
        responses.map(({ body }) =>
          drainDomainEvents(app, [(body as { id: string }).id]),
        ),
      );

      expect(await openSuggestionCount('VARROA_THRESHOLD', colony.id)).toBe(1);
    });
  });
});