import { describe, it, expect, beforeAll } from 'vitest';
import request from 'supertest';
import { pool } from '../../lib/db/pool.js';
import { createApp } from '../../server.js';
import { resetDb } from '../helpers/db.js';
import { migrateUp } from '../../lib/db/migrate.js';

let app, spaceId;
beforeAll(async () => {
  await resetDb(); await migrateUp();
  process.env.OWNER_TOKEN = 'test-token';
  ({ rows: [{ id: spaceId }] } = await pool.query(
    `INSERT INTO spaces(slug,name) VALUES('s','S') RETURNING id`));
  app = createApp();
  let step = 0;
  app.locals.callModel = async ({ onTextDelta }) => {
    if (step++ === 0) return { text: '', toolUses: [{ id: 't1', name: 'propose_change',
      input: { entity_type: 'task', action: 'create', payload: { space_id: spaceId, title: 'Validate CSV' } } }], stopReason: 'tool_use', usage: {} };
    for (const ch of 'Drafted a task.') onTextDelta?.(ch);
    return { text: 'Drafted a task.', toolUses: [], stopReason: 'end_turn', usage: { output_tokens: 3 } };
  };
});

const auth = (r) => r.set('Authorization', 'Bearer test-token');

describe('companion API', () => {
  it('GET creates the conversation and returns empty history', async () => {
    const res = await auth(request(app).get(`/api/spaces/${spaceId}/companion`));
    expect(res.status).toBe(200);
    expect(res.body.conversation_id).toBeTruthy();
    expect(res.body.messages).toEqual([]);
  });

  it('POST /turn streams SSE events and persists messages + draft', async () => {
    const res = await auth(request(app).post(`/api/spaces/${spaceId}/companion/turn`))
      .send({ text: 'make a task to validate the CSV' });
    expect(res.status).toBe(200);
    expect(res.headers['content-type']).toMatch(/text\/event-stream/);
    expect(res.text).toMatch(/event: tool/);
    expect(res.text).toMatch(/event: draft/);
    expect(res.text).toMatch(/event: delta/);
    expect(res.text).toMatch(/event: done/);

    const { rows: msgs } = await pool.query(
      `SELECT role, body, metadata FROM messages ORDER BY created_at`);
    expect(msgs.map(m => m.role)).toEqual(['user', 'assistant']);
    expect(msgs[1].body).toBe('Drafted a task.');
    expect(msgs[1].metadata.draft_ids).toHaveLength(1);

    const { rows: pc } = await pool.query(`SELECT * FROM pending_changes`);
    expect(pc).toHaveLength(1);
    expect(pc[0].status).toBe('pending');

    const { rows: tasks } = await pool.query(`SELECT * FROM tasks WHERE title='Validate CSV'`);
    expect(tasks).toHaveLength(0); // draft only, not applied
  });
});