import { BadRequestException, Logger, NotFoundException } from '@nestjs/common';
import { WebhooksService } from './webhooks.service';
import { PrismaService } from '../prisma/prisma.service';
import { AuditLogService } from '../audit/audit-log.service';
import { DbClient } from '../prisma/db-client';
import { openWebhookSecret } from './webhook-secret';

interface DeliveryRowInput {
  subscriptionId: string;
  event: string;
  body: string;
}

describe('WebhooksService', () => {
  let service: WebhooksService;
  let prisma: {
    webhookSubscription: {
      findMany: jest.Mock;
      findUnique: jest.Mock;
      create: jest.Mock;
      update: jest.Mock;
      delete: jest.Mock;
    };
    webhookDelivery: {
      createMany: jest.Mock;
      findMany: jest.Mock;
    };
    $executeRaw: jest.Mock;
  };
  let auditLog: { record: jest.Mock };

  beforeEach(() => {
    process.env.JWT_ACCESS_SECRET = 'unit-test-jwt-access-secret-0123456789';
    prisma = {
      webhookSubscription: {
        findMany: jest.fn().mockResolvedValue([]),
        findUnique: jest.fn(),
        create: jest.fn(),
        update: jest.fn(),
        delete: jest.fn(),
      },
      webhookDelivery: {
        createMany: jest
          .fn()
          .mockImplementation(({ data }: { data: DeliveryRowInput[] }) =>
            Promise.resolve({ count: data.length }),
          ),
        findMany: jest.fn().mockResolvedValue([]),
      },
      $executeRaw: jest.fn().mockResolvedValue(1),
    };
    auditLog = { record: jest.fn().mockResolvedValue(undefined) };
    service = new WebhooksService(
      prisma as unknown as PrismaService,
      auditLog as unknown as AuditLogService,
    );
  });

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

  const db = () => prisma as unknown as DbClient;

  it('create generates a random secret and stores it', async () => {
    prisma.webhookSubscription.create.mockImplementation(
      ({ data }: { data: Record<string, unknown> }) => ({
        id: 'wh-1',
        ...data,
      }),
    );

    const subscription = await service.create(
      { url: 'https://203.0.113.10/hook', events: ['colony.created'] },
      'user-1',
    );

    expect(subscription.secret).toHaveLength(64);
    const [[createArg]] = prisma.webhookSubscription.create.mock.calls as [
      [
        {
          data: {
            url: string;
            events: string[];
            createdByUserId: string;
            secret: string;
          };
        },
      ],
    ];
    // Stored encrypted, shown in plain only in this one response.
    expect(createArg.data.secret).not.toContain(subscription.secret);
    expect(openWebhookSecret(createArg.data.secret)).toBe(subscription.secret);
    expect(createArg.data.url).toBe('https://203.0.113.10/hook');
    expect(createArg.data.events).toEqual(['colony.created']);
    expect(createArg.data.createdByUserId).toBe('user-1');
  });

  it('delete throws NotFoundException when the subscription is missing', async () => {
    prisma.webhookSubscription.findUnique.mockResolvedValue(null);
    await expect(service.delete('missing', 'user-1')).rejects.toBeInstanceOf(
      NotFoundException,
    );
  });

  describe('enqueueDeliveries', () => {
    it('enqueueDeliveries writes one row per active subscription for the event and wakes the worker', async () => {
      prisma.webhookSubscription.findMany.mockResolvedValueOnce([
        { id: 'wh-1' },
        { id: 'wh-2' },
      ]);
      const payload = { id: 'colony-1', code: 'V-1' };

      await expect(
        service.enqueueDeliveries(db(), 'colony.created', payload),
      ).resolves.toBe(2);

      expect(prisma.webhookSubscription.findMany).toHaveBeenCalledWith({
        where: { active: true, events: { has: 'colony.created' } },
        select: { id: true },
      });
      // The body is fixed here, so every retry sends the same bytes.
      const body = JSON.stringify({ event: 'colony.created', data: payload });
      expect(prisma.webhookDelivery.createMany).toHaveBeenCalledWith({
        data: [
          { subscriptionId: 'wh-1', event: 'colony.created', body },
          { subscriptionId: 'wh-2', event: 'colony.created', body },
        ],
      });
      expect(prisma.$executeRaw).toHaveBeenCalledTimes(1);
      const [[strings, ...values]] = prisma.$executeRaw.mock.calls as [
        [TemplateStringsArray, ...unknown[]],
      ];
      expect(strings.join('$')).toBe("SELECT pg_notify($, '')");
      expect(values).toEqual(['webhook_delivery']);
    });

    it('writes nothing and wakes nobody without a matching subscription', async () => {
      await expect(
        service.enqueueDeliveries(db(), 'task.created', { id: 't1' }),
      ).resolves.toBe(0);

      expect(prisma.webhookDelivery.createMany).not.toHaveBeenCalled();
      expect(prisma.$executeRaw).not.toHaveBeenCalled();
    });

    it('works on the client it is given, e.g. a handler transaction', async () => {
      const tx = {
        webhookSubscription: {
          findMany: jest.fn().mockResolvedValue([{ id: 'wh-1' }]),
        },
        webhookDelivery: {
          createMany: jest.fn().mockResolvedValue({ count: 1 }),
        },
        $executeRaw: jest.fn().mockResolvedValue(1),
      };

      await service.enqueueDeliveries(
        tx as unknown as DbClient,
        'stock.changed',
        { bottlingBatchIds: ['b1'], productIds: [] },
      );

      expect(tx.webhookDelivery.createMany).toHaveBeenCalledTimes(1);
      expect(tx.$executeRaw).toHaveBeenCalledTimes(1);
      expect(prisma.webhookDelivery.createMany).not.toHaveBeenCalled();
      expect(prisma.$executeRaw).not.toHaveBeenCalled();
    });
  });

  describe('dispatch (legacy path)', () => {
    it('enqueues on the root client after the commit and sends nothing itself', async () => {
      prisma.webhookSubscription.findMany.mockResolvedValueOnce([
        { id: 'wh-1' },
      ]);

      await expect(
        service.dispatch('colony.created', { id: 'colony-1' }),
      ).resolves.toBeUndefined();

      expect(prisma.webhookSubscription.findMany).toHaveBeenCalledWith({
        where: { active: true, events: { has: 'colony.created' } },
        select: { id: true },
      });
      expect(prisma.webhookDelivery.createMany).toHaveBeenCalledWith({
        data: [
          {
            subscriptionId: 'wh-1',
            event: 'colony.created',
            body: '{"event":"colony.created","data":{"id":"colony-1"}}',
          },
        ],
      });
      expect(prisma.$executeRaw).toHaveBeenCalledTimes(1);
    });

    // dispatch() runs after the event's record is committed: a failure must
    // not fail that request (the client would retry and store it twice).
    describe('when enqueuing fails', () => {
      let errorSpy: jest.SpyInstance;

      beforeEach(() => {
        errorSpy = jest
          .spyOn(Logger.prototype, 'error')
          .mockImplementation(() => undefined);
      });

      it('dispatch never throws when enqueuing fails (legacy path)', async () => {
        prisma.webhookSubscription.findMany.mockResolvedValueOnce([
          { id: 'wh-1' },
        ]);
        prisma.webhookDelivery.createMany.mockRejectedValueOnce(
          new Error('db down'),
        );

        await expect(
          service.dispatch('colony.created', { id: 'colony-1' }),
        ).resolves.toBeUndefined();

        expect(errorSpy).toHaveBeenCalledTimes(1);
        const [message] = errorSpy.mock.calls[0] as [string];
        expect(message).toContain('colony.created colony-1');
        expect(message).toContain('db down');
      });

      it('never throws when the subscriptions cannot be loaded and logs the record', async () => {
        prisma.webhookSubscription.findMany.mockRejectedValueOnce(
          new Error('db down'),
        );

        await expect(
          service.dispatch('colony.created', { id: 'colony-1' }),
        ).resolves.toBeUndefined();

        const [message] = errorSpy.mock.calls[0] as [string];
        expect(message).toContain('colony.created colony-1');
        expect(message).toContain('db down');
      });

      it('also logs a payload without its own id', async () => {
        prisma.webhookSubscription.findMany.mockRejectedValueOnce(
          new Error('db down'),
        );

        await service.dispatch('stock.changed', {
          bottlingBatchIds: ['b-1'],
          productIds: [],
        });

        const [message] = errorSpy.mock.calls[0] as [string];
        expect(message).toContain('stock.changed');
        expect(message).toContain('db down');
      });
    });
  });

  describe('findDeliveries', () => {
    it('lists the newest deliveries of a subscription without their body', async () => {
      prisma.webhookSubscription.findUnique.mockResolvedValueOnce({
        id: 'wh-1',
      });
      const rows = [{ id: 'd2' }, { id: 'd1' }];
      prisma.webhookDelivery.findMany.mockResolvedValueOnce(rows);

      await expect(service.findDeliveries('wh-1', 20)).resolves.toBe(rows);

      expect(prisma.webhookDelivery.findMany).toHaveBeenCalledWith({
        where: { subscriptionId: 'wh-1' },
        orderBy: [{ createdAt: 'desc' }, { id: 'desc' }],
        take: 20,
        select: {
          id: true,
          event: true,
          status: true,
          attempts: true,
          lastStatusCode: true,
          lastError: true,
          createdAt: true,
          deliveredAt: true,
        },
      });
    });

    it('throws NotFoundException for an unknown subscription', async () => {
      prisma.webhookSubscription.findUnique.mockResolvedValueOnce(null);

      await expect(
        service.findDeliveries('missing', 50),
      ).rejects.toBeInstanceOf(NotFoundException);
      expect(prisma.webhookDelivery.findMany).not.toHaveBeenCalled();
    });
  });

  describe('update', () => {
    const existing = {
      id: 'wh-1',
      url: 'https://203.0.113.10/hook',
      events: ['colony.created'],
      secret: 'a'.repeat(64),
      createdByUserId: 'user-1',
    };

    it('applies the SSRF guard to a changed URL, so an edit is no way around it', async () => {
      prisma.webhookSubscription.findUnique.mockResolvedValue(existing);

      await expect(
        service.update('wh-1', { url: 'http://localhost/hook' }, 'user-1'),
      ).rejects.toBeInstanceOf(BadRequestException);
      expect(prisma.webhookSubscription.update).not.toHaveBeenCalled();
    });

    it('keeps the signing secret so a working receiver does not break', async () => {
      prisma.webhookSubscription.findUnique.mockResolvedValue(existing);
      prisma.webhookSubscription.update.mockResolvedValue({
        ...existing,
        events: ['colony.created', 'harvest.created'],
      });

      await service.update(
        'wh-1',
        { events: ['colony.created', 'harvest.created'] },
        'user-1',
      );

      const [[updateArgs]] = prisma.webhookSubscription.update.mock.calls as [
        [{ data: Record<string, unknown> }],
      ];
      expect(updateArgs.data).not.toHaveProperty('secret');
    });

    it('keeps the secret out of the audit log', async () => {
      prisma.webhookSubscription.findUnique.mockResolvedValue(existing);
      prisma.webhookSubscription.update.mockResolvedValue(existing);

      await service.update('wh-1', { events: ['colony.created'] }, 'user-1');

      const [[auditArgs]] = auditLog.record.mock.calls as [
        [
          {
            beforeData: Record<string, unknown>;
            afterData: Record<string, unknown>;
          },
        ],
      ];
      expect(auditArgs.beforeData).not.toHaveProperty('secret');
      expect(auditArgs.afterData).not.toHaveProperty('secret');
    });

    it('throws NotFoundException for an unknown subscription', async () => {
      prisma.webhookSubscription.findUnique.mockResolvedValue(null);

      await expect(
        service.update('missing', { events: ['colony.created'] }, 'user-1'),
      ).rejects.toBeInstanceOf(NotFoundException);
    });
  });
});