import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { buildApp } from '@/app';
import { prismaClient } from '@/infrastructure/database';
import { FastifyInstance } from 'fastify';
import {
  encryptCredential,
  generateCredentialSecret,
  issueIntegrationToken,
} from '@/modules/catalog/products';
import { sessionsService } from '@/modules/ai-support/sessions';

/** Covers specs/005-ai-support/quickstart.md Scenario 2 — requires a real ANTHROPIC_API_KEY. */
const hasRealApiKey = /^sk-ant-/.test(process.env.ANTHROPIC_API_KEY ?? '');

describe.skipIf(!hasRealApiKey)('AI clarification loop (User Story 2)', () => {
  let app: FastifyInstance;
  const externalProductId = `TEST_AI_ASK_PROD_${Date.now()}`;
  let secret: string;

  beforeAll(async () => {
    app = await buildApp();
    const product = await prismaClient.product.create({
      data: { externalProductId, name: 'AI Ask Test Product', status: 'active' },
    });
    secret = generateCredentialSecret();
    await prismaClient.productIntegration.create({
      data: {
        productId: product.id,
        credentialRef: encryptCredential(secret),
        authMechanism: 'signed_token',
        allowedScope: { tenantIds: ['tenant-1'] },
        status: 'active',
        rateLimitPerMinute: 1000,
        rateLimitPerUserPerMinute: 1000,
      },
    });
    const created = await app.inject({
      method: 'POST',
      url: `/admin/products/${externalProductId}/knowledge`,
      payload: {
        code: `KB-ASK-${Date.now()}`,
        type: 'faq',
        problem: 'Vague, ambiguous problem report scenarios.',
      },
    });
    await app.inject({
      method: 'PATCH',
      url: `/admin/knowledge/${created.json().data.code}/publish`,
    });
    // Force the "ask" band deterministically: an impossibly narrow high/low gap makes almost any
    // confidence land in "ask", and a generous question budget lets the loop actually run.
    await app.inject({
      method: 'PUT',
      url: `/admin/products/${externalProductId}/ai-policy`,
      payload: { highThreshold: 0.999, lowThreshold: 0.001, maxClarifyingQuestions: 1 },
    });
  });

  afterAll(async () => {
    const product = await prismaClient.product.findUnique({ where: { externalProductId } });
    if (product) {
      const tickets = await prismaClient.ticket.findMany({ where: { productId: product.id } });
      const ticketIds = tickets.map((t) => t.id);
      const sessions = await prismaClient.aISupportSession.findMany({
        where: { ticketId: { in: ticketIds } },
      });
      const sessionIds = sessions.map((s) => s.id);
      await prismaClient.aIKnowledgeReference.deleteMany({
        where: { sessionId: { in: sessionIds } },
      });
      await prismaClient.aIDiagnosis.deleteMany({ where: { sessionId: { in: sessionIds } } });
      await prismaClient.aIInteraction.deleteMany({ where: { sessionId: { in: sessionIds } } });
      await prismaClient.aISupportSession.deleteMany({ where: { id: { in: sessionIds } } });
      await prismaClient.ticketMessage.deleteMany({ where: { ticketId: { in: ticketIds } } });
      await prismaClient.ticket.deleteMany({ where: { productId: product.id } });
      await prismaClient.problem.deleteMany({ where: { productId: product.id } });
      await prismaClient.knowledgeEntry.deleteMany({ where: { productId: product.id } });
      await prismaClient.aIConfidencePolicy.deleteMany({ where: { productId: product.id } });
    }
    await prismaClient.productIntegration.deleteMany({ where: { product: { externalProductId } } });
    await prismaClient.product.deleteMany({ where: { externalProductId } });
    await app.close();
  });

  it('an "ask" outcome posts a customer-visible question, and a reply produces a new diagnosis', async () => {
    const token = issueIntegrationToken(secret, {
      externalProductId,
      tenantId: 'tenant-1',
      userId: 'user-1',
    });
    const created = await app.inject({
      method: 'POST',
      url: '/v1/support/requests',
      headers: { authorization: `Bearer ${token}` },
      payload: {
        productId: externalProductId,
        tenantId: 'tenant-1',
        userId: 'user-1',
        source: 'test',
        problem: 'It broke.',
      },
    });
    const ticketId = created.json().data.ticketId;
    await sessionsService.runFirstTurn(ticketId);

    const beforeReply = await app.inject({ method: 'GET', url: `/tickets/${ticketId}/ai-session` });
    const beforeStatus: string = beforeReply.json().data.status;
    const diagnosesBefore = beforeReply.json().data.diagnosis;

    if (beforeStatus === 'escalated') {
      // The very first diagnosis already escalated (e.g. FR-006/provider failure) — the "ask"
      // path specifically wasn't exercised this run; nothing further to assert here.
      return;
    }

    const messagesResponse = await app.inject({
      method: 'GET',
      url: `/tickets/${ticketId}/messages`,
    });
    const aiMessages = messagesResponse
      .json()
      .data.filter((m: { type: string }) => m.type === 'AI_MESSAGE');
    expect(aiMessages.length).toBeGreaterThan(0);

    const replyResponse = await app.inject({
      method: 'POST',
      url: `/tickets/${ticketId}/ai-session/messages`,
      payload: {
        message: 'The problem happens specifically when I try to load the dashboard page.',
      },
    });
    expect(replyResponse.statusCode).toBe(200);

    const afterReply = await app.inject({ method: 'GET', url: `/tickets/${ticketId}/ai-session` });
    // A new diagnosis must exist and be distinguishable from the first (different createdAt) —
    // proving re-diagnosis happened rather than reusing the original.
    expect(afterReply.json().data.diagnosis.id).not.toBe(diagnosesBefore?.id);
  }, 90000);
});

/** No LLM call involved — runs unconditionally, unlike the rest of this file. */
describe('AI session message routing guard (contracts/ai-support-contract.md guarantee 1)', () => {
  let app: FastifyInstance;

  beforeAll(async () => {
    app = await buildApp();
  });

  afterAll(async () => {
    await app.close();
  });

  it('404s replying to a ticket with no active AI session', async () => {
    const response = await app.inject({
      method: 'POST',
      url: `/tickets/nonexistent-ticket-id/ai-session/messages`,
      payload: { message: 'hello' },
    });
    expect(response.statusCode).toBe(404);
  });
});