import { describe, it, expect, beforeAll, beforeEach } from 'vitest';
import request from 'supertest';
import { setup } from './helpers.js';
import * as spacesRepo from '../../lib/db/repos/spaces.js';
import * as projectsRepo from '../../lib/db/repos/projects.js';
import * as pagesRepo from '../../lib/db/repos/pages.js';

let app, ownerHeaders, space, project, page;
const owner = { kind: 'user', id: null };

beforeAll(async () => { ({ app, ownerHeaders } = await setup()); });
beforeEach(async () => {
  space = await spacesRepo.create({ slug: `s-${Date.now()}-${Math.random().toString(36).slice(2,5)}`, name: 'S' }, owner);
  project = await projectsRepo.create({ space_id: space.id, slug: 'p', name: 'P' }, owner);
  page = await pagesRepo.create({ space_id: space.id, slug: 'pg', title: 'PG' }, owner);
});

describe('links routes', () => {
  it('POST creates link with default relation', async () => {
    const res = await request(app).post('/api/links').set(ownerHeaders).send({
      from_type: 'project', from_id: project.id,
      to_type: 'page', to_id: page.id
    });
    expect(res.status).toBe(201);
    expect(res.body.relation).toBe('attached');
    expect(res.body.from_id).toBe(project.id);
    expect(res.body.to_id).toBe(page.id);
  });

  it('POST is idempotent on the unique tuple', async () => {
    const a = await request(app).post('/api/links').set(ownerHeaders).send({
      from_type: 'project', from_id: project.id,
      to_type: 'page', to_id: page.id, relation: 'mentions'
    });
    const b = await request(app).post('/api/links').set(ownerHeaders).send({
      from_type: 'project', from_id: project.id,
      to_type: 'page', to_id: page.id, relation: 'mentions'
    });
    expect(a.body.id).toBe(b.body.id);
  });

  it('GET /from/:type/:id and /to/:type/:id', async () => {
    await request(app).post('/api/links').set(ownerHeaders).send({
      from_type: 'project', from_id: project.id,
      to_type: 'page', to_id: page.id, relation: 'mentions'
    });
    const from = await request(app).get(`/api/links/from/project/${project.id}`).set(ownerHeaders);
    expect(from.status).toBe(200);
    expect(from.body).toHaveLength(1);
    expect(from.body[0].to_id).toBe(page.id);

    const to = await request(app).get(`/api/links/to/page/${page.id}`).set(ownerHeaders);
    expect(to.status).toBe(200);
    expect(to.body).toHaveLength(1);
    expect(to.body[0].from_id).toBe(project.id);
  });

  it('DELETE /:id removes the link', async () => {
    const created = await request(app).post('/api/links').set(ownerHeaders).send({
      from_type: 'project', from_id: project.id,
      to_type: 'page', to_id: page.id
    });
    const del = await request(app).delete(`/api/links/${created.body.id}`).set(ownerHeaders);
    expect(del.status).toBe(204);
    const after = await request(app).get(`/api/links/from/project/${project.id}`).set(ownerHeaders);
    expect(after.body).toHaveLength(0);
  });

  it('POST with unknown entity_type → 400', async () => {
    const res = await request(app).post('/api/links').set(ownerHeaders).send({
      from_type: 'widget', from_id: project.id,
      to_type: 'page', to_id: page.id
    });
    expect(res.status).toBe(400);
  });

  it('GET /from with unknown type → 400', async () => {
    const res = await request(app).get(`/api/links/from/widget/${project.id}`).set(ownerHeaders);
    expect(res.status).toBe(400);
  });

  it('unauthenticated → 401', async () => {
    const res = await request(app).post('/api/links').send({
      from_type: 'project', from_id: project.id,
      to_type: 'page', to_id: page.id
    });
    expect(res.status).toBe(401);
  });
});