import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { buildApp } from '@/app';
import { prismaClient } from '@/infrastructure/database';
import { FastifyInstance } from 'fastify';

/** Covers specs/005-ai-support/contracts/ai-support-contract.md's confidence-policy admin
 * surface (FR-005) — no LLM call involved, so this runs unconditionally against a real
 * Postgres, unlike the AI-diagnosis/reasoning tests in this same directory. */
describe('AI confidence policy — admin config (FR-005)', () => {
  let app: FastifyInstance;
  const externalProductId = `TEST_AI_POLICY_PROD_${Date.now()}`;

  beforeAll(async () => {
    app = await buildApp();
    await prismaClient.product.create({
      data: { externalProductId, name: 'AI Policy Test Product', status: 'active' },
    });
  });

  afterAll(async () => {
    const product = await prismaClient.product.findUnique({ where: { externalProductId } });
    if (product) {
      await prismaClient.aIConfidencePolicy.deleteMany({ where: { productId: product.id } });
    }
    await prismaClient.product.deleteMany({ where: { externalProductId } });
    await app.close();
  });

  it('rejects a highThreshold at or below lowThreshold', async () => {
    const response = await app.inject({
      method: 'PUT',
      url: `/admin/products/${externalProductId}/ai-policy`,
      payload: { highThreshold: 0.4, lowThreshold: 0.4, maxClarifyingQuestions: 2 },
    });
    expect(response.statusCode).toBe(400);
  });

  it('upserts a product-wide policy and reflects it on GET, alongside the system defaults', async () => {
    const putResponse = await app.inject({
      method: 'PUT',
      url: `/admin/products/${externalProductId}/ai-policy`,
      payload: { highThreshold: 0.8, lowThreshold: 0.3, maxClarifyingQuestions: 3 },
    });
    expect(putResponse.statusCode).toBe(200);
    expect(putResponse.json().data.highThreshold).toBe(0.8);

    const getResponse = await app.inject({
      method: 'GET',
      url: `/admin/products/${externalProductId}/ai-policy`,
    });
    expect(getResponse.statusCode).toBe(200);
    const body = getResponse.json().data;
    expect(body.configured).toHaveLength(1);
    expect(body.configured[0].highThreshold).toBe(0.8);
    expect(body.systemDefaults).toHaveProperty('highThreshold');
    expect(body.systemDefaults).toHaveProperty('lowThreshold');
    expect(body.systemDefaults).toHaveProperty('maxClarifyingQuestions');
  });

  it('a second PUT for the same product (no category) updates the existing row rather than creating a duplicate', async () => {
    await app.inject({
      method: 'PUT',
      url: `/admin/products/${externalProductId}/ai-policy`,
      payload: { highThreshold: 0.9, lowThreshold: 0.2, maxClarifyingQuestions: 1 },
    });
    const getResponse = await app.inject({
      method: 'GET',
      url: `/admin/products/${externalProductId}/ai-policy`,
    });
    const configured = getResponse.json().data.configured;
    expect(configured).toHaveLength(1);
    expect(configured[0].highThreshold).toBe(0.9);
  });

  it('404s for an unregistered product', async () => {
    const response = await app.inject({
      method: 'PUT',
      url: `/admin/products/TEST_NEVER_REGISTERED_${Date.now()}/ai-policy`,
      payload: { highThreshold: 0.8, lowThreshold: 0.3, maxClarifyingQuestions: 2 },
    });
    expect(response.statusCode).toBe(404);
  });
});