import {
  CommentAddedEvent,
  IssueAssignedEvent,
  IssuePriority,
  IssueSprintChangedEvent,
  IssueStatusChangedEvent,
  IssueUpdatedEvent,
  NotificationKind,
  NotificationReadModel,
  NotificationSettingsReadModel,
  ProjectMemberAddedEvent,
  ProjectRole,
  StatusCategory,
  TrackerEvent,
} from '@task-stream/api/tracker/domain';
import { FakeUserDirectory } from '../../testing/in-memory';
import { ChangeFeed } from '../ports/change-feed';
import { FindCommentsRepository } from '../ports/find-comments.repository';
import { FindIssuesRepository } from '../ports/find-issues.repository';
import { FindSprintsRepository } from '../ports/find-sprints.repository';
import { FindProjectsRepository } from '../ports/find-projects.repository';
import { NotificationMailer } from '../ports/notification-mailer';
import { NotificationsRepository } from '../ports/notifications.repository';
import { NotificationsEventHandler } from './notifications.event-handler';
import { Notifier } from './notifier';

class InMemoryNotifications extends NotificationsRepository {
  readonly all: NotificationReadModel[] = [];
  readonly emailOn = new Set<string>();
  async insert(n: NotificationReadModel) {
    if (this.all.some((x) => x.id === n.id)) return false;
    this.all.push(n);
    return true;
  }
  async findForUser(userId: string) {
    return this.all.filter((n) => n.userId === userId);
  }
  async countUnread(userId: string) {
    return this.all.filter((n) => n.userId === userId && !n.readAt).length;
  }
  async markRead() {
    return;
  }
  async settings(userId: string): Promise<NotificationSettingsReadModel> {
    return { userId, email: this.emailOn.has(userId) };
  }
  async saveSettings() {
    return;
  }
}

const at = <T extends TrackerEvent>(event: T, version = 2): T =>
  Object.assign(event, {
    aggregateVersion: version,
    occurredAt: '2026-10-08T10:00:00.000Z',
  });

function setup(mailEnabled = false) {
  const repo = new InMemoryNotifications();
  const published: NotificationReadModel[] = [];
  const mailed: string[] = [];
  const users = new FakeUserDirectory()
    .add('ana')
    .add('bob')
    .add('qa')
    .add('pm');
  const issue = {
    id: 'i-1',
    key: 'WEB-1',
    title: 'Login roto',
    reporter: { id: 'qa', name: 'QA' },
    assignee: { id: 'bob', name: 'Bob' },
    watchers: [
      { id: 'pm', name: 'PM' },
      { id: 'bob', name: 'Bob' },
    ],
  };
  const notifier = new Notifier(
    repo,
    {
      publishNotification: async (n: NotificationReadModel) => {
        published.push(n);
      },
    } as unknown as ChangeFeed,
    {
      enabled: mailEnabled,
      send: async (to: { email: string }) => {
        mailed.push(to.email);
      },
    } as unknown as NotificationMailer,
    users,
  );
  const handler = new NotificationsEventHandler(
    notifier,
    { findById: async () => issue } as unknown as FindIssuesRepository,
    {
      findById: async () => ({
        id: 'p-1',
        key: 'WEB',
        name: 'Web',
        members: ['ana', 'bob', 'qa', 'pm'].map((id) => ({
          user: { id, name: id },
          role: ProjectRole.MEMBER,
        })),
      }),
    } as unknown as FindProjectsRepository,
    users,
    {
      // A comment of the PM's, that others answer.
      findById: async (id: string) =>
        id === 'c-pm'
          ? { id, author: { id: 'pm', name: 'PM' }, deleted: false }
          : null,
    } as unknown as FindCommentsRepository,
    {
      findById: async (id: string) =>
        id === 's-14' ? { id, name: 'Sprint 14' } : null,
    } as unknown as FindSprintsRepository,
  );
  return { repo, published, mailed, handler };
}

describe('notifications', () => {
  it('tells whoever a ticket is assigned to, not whoever assigned it', async () => {
    const { handler, repo, published } = setup();
    await handler.handle(
      at(new IssueAssignedEvent('ana', 'i-1', 'p-1', 'bob', null)),
    );
    await handler.handle(
      at(new IssueAssignedEvent('ana', 'i-1', 'p-1', 'ana', null), 3),
    );

    expect(repo.all.map((n) => [n.userId, n.kind])).toEqual([
      ['bob', NotificationKind.ASSIGNED],
      // Bob follows the ticket too, but is told once: as the assignee.
      ['pm', NotificationKind.WATCHED],
      ['pm', NotificationKind.WATCHED],
      ['bob', NotificationKind.WATCHED],
    ]);
    expect(published).toHaveLength(4);
    expect(repo.all[0].summary).toContain('WEB-1');
  });

  it('marks a ticket sent back from QA as such, for whoever works on it and reported it', async () => {
    const { handler, repo } = setup();
    await handler.handle(
      at(
        new IssueStatusChangedEvent(
          'ana',
          'i-1',
          'p-1',
          'IN_QA',
          'QA_FAILED',
          'Falla en Safari',
          {
            fromName: 'En QA',
            toName: 'QA fallido',
            fromCategory: StatusCategory.QA,
            toCategory: StatusCategory.IN_PROGRESS,
          },
        ),
      ),
    );

    expect(repo.all.map((n) => [n.userId, n.kind])).toEqual([
      ['bob', NotificationKind.QA_FAILED],
      ['qa', NotificationKind.QA_FAILED],
      ['pm', NotificationKind.WATCHED],
    ]);
    expect(repo.all[0].summary).toContain('Falla en Safari');
  });

  it('tells about a comment everyone but its author, once even when redelivered', async () => {
    const { handler, repo } = setup();
    const comment = at(
      new CommentAddedEvent('bob', {
        id: 'c-1',
        issueId: 'i-1',
        projectId: 'p-1',
        authorId: 'bob',
        body: 'Ya está arreglado',
        replyTo: null,
        deleted: false,
        createdAt: '2026-10-08T10:00:00.000Z',
        editedAt: null,
      }),
      1,
    );
    await handler.handle(comment);
    await handler.handle(comment);

    expect(repo.all.map((n) => n.userId)).toEqual(['qa', 'pm']);
  });

  it('tells a mentioned member first, and nobody outside the project', async () => {
    const { handler, repo } = setup();
    await handler.handle(
      at(
        new CommentAddedEvent('bob', {
          id: 'c-2',
          issueId: 'i-1',
          projectId: 'p-1',
          authorId: 'bob',
          body: '@[PM](pm) mira esto, y @[Fuera](stranger) también',
          replyTo: null,
          deleted: false,
          createdAt: '2026-10-08T10:00:00.000Z',
          editedAt: null,
        }),
        1,
      ),
    );

    expect(repo.all.map((n) => [n.userId, n.kind])).toEqual([
      ['pm', NotificationKind.MENTIONED],
      ['qa', NotificationKind.COMMENTED],
    ]);
    expect(repo.all[0].summary).toContain('«@PM mira esto');
  });

  it('tells whoever wrote a comment that someone answered it', async () => {
    const { handler, repo } = setup();
    await handler.handle(
      at(
        new CommentAddedEvent('bob', {
          id: 'c-3',
          issueId: 'i-1',
          projectId: 'p-1',
          authorId: 'bob',
          body: 'Lo miro',
          replyTo: 'c-pm',
          deleted: false,
          createdAt: '2026-10-08T10:00:00.000Z',
          editedAt: null,
        }),
        1,
      ),
    );

    expect(repo.all.map((n) => [n.userId, n.kind])).toEqual([
      ['pm', NotificationKind.REPLIED],
      ['qa', NotificationKind.COMMENTED],
    ]);
    expect(repo.all[0].summary).toContain('respondió a tu comentario');
  });

  it('tells followers of a new priority, due date or sprint, not of smaller edits', async () => {
    const { handler, repo } = setup();
    await handler.handle(
      at(
        new IssueUpdatedEvent('ana', 'i-1', 'p-1', {
          priority: IssuePriority.HIGH,
          dueDate: '2026-11-14',
        }),
      ),
    );
    await handler.handle(
      at(new IssueUpdatedEvent('ana', 'i-1', 'p-1', { title: 'Login' }), 3),
    );
    await handler.handle(
      at(new IssueSprintChangedEvent('ana', 'i-1', 'p-1', 's-14', null), 4),
    );
    await handler.handle(
      at(new IssueSprintChangedEvent('ana', 'i-1', 'p-1', null, 's-14'), 5),
    );

    expect(repo.all.map((n) => [n.userId, n.kind, n.summary])).toEqual([
      [
        'pm',
        NotificationKind.WATCHED,
        'user ana cambió WEB-1: Login roto: prioridad Alta, fecha límite el 14 de noviembre de 2026',
      ],
      [
        'bob',
        NotificationKind.WATCHED,
        'user ana cambió WEB-1: Login roto: prioridad Alta, fecha límite el 14 de noviembre de 2026',
      ],
      [
        'pm',
        NotificationKind.WATCHED,
        'user ana metió WEB-1: Login roto en el sprint Sprint 14',
      ],
      [
        'bob',
        NotificationKind.WATCHED,
        'user ana metió WEB-1: Login roto en el sprint Sprint 14',
      ],
      [
        'pm',
        NotificationKind.WATCHED,
        'user ana sacó WEB-1: Login roto del sprint y lo devolvió al backlog',
      ],
      [
        'bob',
        NotificationKind.WATCHED,
        'user ana sacó WEB-1: Login roto del sprint y lo devolvió al backlog',
      ],
    ]);
  });

  it('copies by e-mail only to whoever asked for it, when mail is configured', async () => {
    const { handler, repo, mailed } = setup(true);
    repo.emailOn.add('bob');
    await handler.handle(
      at(new ProjectMemberAddedEvent('ana', 'p-1', 'bob', ProjectRole.MEMBER)),
    );
    await handler.handle(
      at(
        new ProjectMemberAddedEvent('ana', 'p-1', 'qa', ProjectRole.MEMBER),
        3,
      ),
    );

    expect(mailed).toEqual(['bob@example.org']);
    expect(repo.all.map((n) => n.kind)).toEqual([
      NotificationKind.ADDED_TO_PROJECT,
      NotificationKind.ADDED_TO_PROJECT,
    ]);
  });
});