import { INestApplication } from '@nestjs/common';
import * as bcrypt from 'bcryptjs';
import { App } from 'supertest/types';
import { addDays } from '../src/common/dates';
import { DomainEventsService } from '../src/domain-events/domain-events.service';
import type { AnyDomainEventEnvelope } from '../src/domain-events/domain-event-types';
import { PrismaService } from '../src/prisma/prisma.service';
import { DigestService } from '../src/reminders/digest.service';
import { TaskDueHandlers } from '../src/reminders/task-due.handlers';
import { createTestApp } from './utils/create-test-app';
import { drainDomainEvents } from './utils/domain-events';

const d = (day: string): Date => new Date(`${day}T00:00:00.000Z`);

/**
 * Fixed day in 2001 on which the swarm season begins by calendar
 * (KIRSCHE 15 April), so an apiary's segment starts "today". Other files
 * share the database: assertions only look at the rows and lines of this
 * file's own users, apiary and tasks.
 */
const TODAY = '2001-04-15';
const YESTERDAY = '2001-04-14';

/** The digest window of a run at 04:30 (UTC, for the test) on `day`. */
const windowOf = (day: string) => ({
  from: new Date(`${addDays(day, -1)}T02:30:00.000Z`),
  until: new Date(`${day}T02:30:00.000Z`),
});

describe('Reminders (e2e)', () => {
  let app: INestApplication<App>;
  let prisma: PrismaService;
  let digests: DigestService;
  const suffix = `${Date.now()}-${Math.round(Math.random() * 1e6)}`;
  const roleIds: string[] = [];
  const userIds: string[] = [];
  const taskIds: string[] = [];
  const colonyIds: string[] = [];
  let apiaryId: string;
  let apiaryName: string;
  const users = {} as Record<
    'full' | 'noInspection' | 'completer' | 'off' | 'nothing',
    string
  >;

  async function createUser(
    label: string,
    permissions: string[],
  ): Promise<string> {
    const role = await prisma.role.create({
      data: {
        key: `REMINDERS_${label.toUpperCase()}_${suffix}`,
        name: `Reminders ${label}`,
        permissions: {
          create: permissions.map((key) => ({
            permission: { connect: { key } },
          })),
        },
      },
    });
    roleIds.push(role.id);
    const user = await prisma.user.create({
      data: {
        email: `reminders-e2e-${label}-${suffix}@example.com`,
        passwordHash: await bcrypt.hash('SuperSecret123!', 4),
        name: `Reminders ${label}`,
        role: { connect: { id: role.id } },
      },
    });
    userIds.push(user.id);
    return user.id;
  }

  async function createTask(
    title: string,
    assignedUserId: string | null,
    dueDate: string,
  ): Promise<string> {
    const task = await prisma.task.create({
      data: { title, assignedUserId, dueDate: d(dueDate) },
    });
    taskIds.push(task.id);
    return task.id;
  }

  async function recordTaskDue(taskId: string, dueOn: string): Promise<void> {
    await prisma.$transaction((tx) =>
      app.get(DomainEventsService).record(tx, {
        type: 'TaskDue',
        aggregateType: 'Task',
        aggregateId: taskId,
        payload: { dueOn },
        dedupeKey: `TaskDue:${taskId}:${dueOn}`,
      }),
    );
  }

  const notificationsOf = (userId: string, relatedId: string) =>
    prisma.notification.findMany({ where: { userId, relatedId } });

  const digestOf = (userId: string) =>
    prisma.notification.findMany({
      where: { userId, dedupeKey: `digest:${TODAY}:${userId}` },
    });

  beforeAll(async () => {
    app = await createTestApp();
    prisma = app.get(PrismaService);
    digests = app.get(DigestService);
    users.full = await createUser('full', [
      'tasks:read',
      'colonies:read',
      'inspections:read',
      'apiaries:read',
    ]);
    users.noInspection = await createUser('noinspection', [
      'tasks:read',
      'apiaries:read',
    ]);
    users.completer = await createUser('completer', [
      'tasks:read',
      'tasks:complete',
    ]);
    users.off = await createUser('off', ['tasks:read', 'apiaries:read']);
    users.nothing = await createUser('nothing', ['colonies:read']);
    await prisma.notificationPreference.create({
      data: { userId: users.off, taskDueEnabled: false, digestEnabled: false },
    });
    apiaryName = `Reminders e2e ${suffix}`;
    apiaryId = (await prisma.apiary.create({ data: { name: apiaryName } })).id;
    for (const code of ['A', 'B']) {
      const colony = await prisma.colony.create({
        data: {
          code: `REM-E2E-${suffix}-${code}`,
          apiaryId,
          colonyType: 'PRODUCTION_COLONY',
          createdAt: d('2001-03-01'),
        },
      });
      colonyIds.push(colony.id);
      await prisma.inspection.create({
        data: {
          colonyId: colony.id,
          userId: users.full,
          date: d('2001-03-10'),
        },
      });
    }
    // Two segment changes of the apiary: one before yesterday's digest
    // (reported then), one after it (reported today). Status DONE, so no
    // dispatcher touches them.
    const seasonEvent = (
      previousSegment: string,
      segment: string,
      occurredAt: string,
    ) =>
      prisma.domainEvent.create({
        data: {
          type: 'SeasonPhaseChanged',
          aggregateType: 'Apiary',
          aggregateId: apiaryId,
          payload: { apiaryId, previousSegment, segment },
          correlationId: `reminders-e2e-${suffix}`,
          occurredAt: new Date(occurredAt),
          status: 'DONE',
        },
      });
    await seasonEvent('FRUEHJAHR', 'SCHWARMZEIT', '2001-04-13T12:00:00.000Z');
    await seasonEvent('SCHWARMZEIT', 'SOMMER', '2001-04-14T12:00:00.000Z');
  });

  afterAll(async () => {
    await prisma.notification.deleteMany({
      where: {
        OR: [{ userId: { in: userIds } }, { relatedId: { in: taskIds } }],
      },
    });
    await prisma.domainEvent.deleteMany({
      where: { aggregateId: { in: [...taskIds, apiaryId] } },
    });
    await prisma.inspection.deleteMany({
      where: { colonyId: { in: colonyIds } },
    });
    await prisma.colony.deleteMany({ where: { id: { in: colonyIds } } });
    await prisma.apiary.delete({ where: { id: apiaryId } });
    await prisma.task.deleteMany({ where: { id: { in: taskIds } } });
    await prisma.refreshToken.deleteMany({
      where: { userId: { in: userIds } },
    });
    await prisma.auditLog.deleteMany({ where: { userId: { in: userIds } } });
    await prisma.user.deleteMany({ where: { id: { in: userIds } } });
    await prisma.role.deleteMany({ where: { id: { in: roleIds } } });
    await app.close();
  });

  it('TaskDue after draining yields exactly one notification per recipient, also after redelivery', async () => {
    const taskId = await createTask('Reminders e2e Waben', users.full, TODAY);
    await recordTaskDue(taskId, TODAY);

    await drainDomainEvents(app, [taskId]);

    const rows = await notificationsOf(users.full, taskId);
    expect(rows).toHaveLength(1);
    expect(rows[0]).toMatchObject({
      priority: 'HINWEIS',
      category: 'TASK_DUE',
      message: 'Fällig seit 15.04.: Reminders e2e Waben',
      link: '/tasks',
      relatedType: 'Task',
      dedupeKey: `task-due:${taskId}:${TODAY}:${users.full}`,
      requiredPermissions: ['tasks:read'],
    });
    // A redelivery runs the handler a second time.
    const envelope: AnyDomainEventEnvelope<'TaskDue'> = {
      id: 'redelivery',
      type: 'TaskDue',
      aggregateType: 'Task',
      aggregateId: taskId,
      payload: { dueOn: TODAY },
      actorUserId: null,
      correlationId: 'redelivery',
      occurredAt: new Date(),
      attempts: 1,
    };
    await prisma.$transaction((tx) =>
      app.get(TaskDueHandlers).taskDue(envelope, tx),
    );
    expect(await notificationsOf(users.full, taskId)).toHaveLength(1);
    for (const other of [users.noInspection, users.completer, users.nothing]) {
      expect(await notificationsOf(other, taskId)).toHaveLength(0);
    }
  });

  it('a task without an assignee reaches holders of tasks:complete and not users who switched it off', async () => {
    const taskId = await createTask('Reminders e2e offen', null, TODAY);
    await recordTaskDue(taskId, TODAY);

    await drainDomainEvents(app, [taskId]);

    expect(await notificationsOf(users.completer, taskId)).toHaveLength(1);
    for (const other of [users.full, users.noInspection, users.off]) {
      expect(await notificationsOf(other, taskId)).toHaveLength(0);
    }
  });

  it('writes nothing for a task that was completed before delivery', async () => {
    const taskId = await createTask(
      'Reminders e2e erledigt',
      users.full,
      TODAY,
    );
    await prisma.task.update({
      where: { id: taskId },
      data: { status: 'DONE', completedAt: new Date() },
    });
    await recordTaskDue(taskId, TODAY);

    await drainDomainEvents(app, [taskId]);

    expect(await notificationsOf(users.full, taskId)).toHaveLength(0);
  });

  it('running the digest step twice yields one digest per user', async () => {
    // Plus the open task of the first test: three due, one overdue.
    await createTask('Reminders e2e heute', users.full, TODAY);
    await createTask('Reminders e2e ueberfaellig', users.full, '2001-04-10');
    const own = [
      users.full,
      users.noInspection,
      users.completer,
      users.off,
      users.nothing,
    ];

    const first = await digests.runFor(TODAY, own, windowOf(TODAY));
    const second = await digests.runFor(TODAY, own, windowOf(TODAY));

    expect(first).toBeGreaterThanOrEqual(2);
    expect(second).toBe(0);
    for (const userId of own) {
      expect((await digestOf(userId)).length).toBeLessThanOrEqual(1);
    }
    const [full] = await digestOf(users.full);
    expect(full).toMatchObject({
      priority: 'INFO',
      category: 'DIGEST',
      link: '/dashboard',
    });
    const lines = full.message.split('\n');
    expect(lines[0]).toBe('Guten Morgen. Heute für dich:');
    expect(lines).toContain('3 Aufgaben fällig, 1 davon überfällig.');
    expect(lines).toContain(
      `Durchsicht fällig: 2 Völker am Stand ${apiaryName}.`,
    );
    expect(lines).toContain(
      `Stand ${apiaryName}: Sommer beginnt. Durchsicht alle 14 Tage.`,
    );
    // The change before yesterday's digest is not repeated.
    expect(full.message).not.toContain('Schwarmzeit beginnt');
    expect(full.requiredPermissions).toEqual(
      expect.arrayContaining([
        'tasks:read',
        'colonies:read',
        'inspections:read',
        'apiaries:read',
      ]),
    );
  });

  it('the digest of the day before reports the change of its own window', async () => {
    await digests.runFor(YESTERDAY, [users.full], windowOf(YESTERDAY));

    const [yesterday] = await prisma.notification.findMany({
      where: {
        userId: users.full,
        dedupeKey: `digest:${YESTERDAY}:${users.full}`,
      },
    });
    expect(yesterday.message).toContain(
      `Stand ${apiaryName}: Schwarmzeit beginnt. Durchsicht alle 7 Tage.`,
    );
    expect(yesterday.message).not.toContain('Sommer beginnt');
  });

  it('the digest of a user without varroa or inspection rights has no such line', async () => {
    await digests.runFor(TODAY, [users.noInspection], windowOf(TODAY));

    const [digest] = await digestOf(users.noInspection);
    expect(digest.message).toContain(`Stand ${apiaryName}: Sommer`);
    expect(digest.message).not.toContain('Durchsicht fällig');
    expect(digest.requiredPermissions).not.toContain('inspections:read');
    expect(digest.requiredPermissions).not.toContain('colonies:read');
  });

  it('builds no digest for a user who can see nothing in it, and none for a user who switched it off', async () => {
    await digests.runFor(TODAY, [users.nothing, users.off], windowOf(TODAY));

    expect(await digestOf(users.nothing)).toHaveLength(0);
    expect(await digestOf(users.off)).toHaveLength(0);
  });
});