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 1 — requires a real ANTHROPIC_API_KEY
 * (spec.md Assumptions: this feature integrates a real LLM provider, not a mock). Skipped
 * entirely, not failed, when no real key is configured — see README's "AI Support" section for
 * how to supply one locally.
 */
const hasRealApiKey = /^sk-ant-/.test(process.env.ANTHROPIC_API_KEY ?? '');

describe.skipIf(!hasRealApiKey)(
  'AI diagnosis — confidence decides the outcome (User Story 1)',
  () => {
    let app: FastifyInstance;
    const externalProductId = `TEST_AI_DIAG_PROD_${Date.now()}`;
    let secret: string;

    beforeAll(async () => {
      app = await buildApp();
      const product = await prismaClient.product.create({
        data: { externalProductId, name: 'AI Diagnosis 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,
        },
      });
      // FR-006's grounding: at least one published entry must exist for a diagnosis to ever
      // reach the confidence-band decision instead of escalating on "no knowledge".
      await app
        .inject({
          method: 'POST',
          url: `/admin/products/${externalProductId}/knowledge`,
          payload: {
            code: `KB-AITEST-${Date.now()}`,
            type: 'faq',
            problem: 'The application will not load past the loading screen.',
            recommendedSolution: 'Clear the browser cache and reload.',
          },
        })
        .then((r) => {
          const code = r.json().data.code;
          return app.inject({ method: 'PATCH', url: `/admin/knowledge/${code}/publish` });
        });
    });

    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();
    });

    async function createTicketAndRunFirstTurn(problem: string): Promise<string> {
      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,
        },
      });
      const ticketId = created.json().data.ticketId;
      // Bypass the queue — no worker runs during buildApp()-based tests, same convention as
      // ticket-attachments.test.ts's malware scanner call.
      await sessionsService.runFirstTurn(ticketId);
      return ticketId;
    }

    it('records a structured diagnosis with a confidence score, grounded in retrieved knowledge', async () => {
      const ticketId = await createTicketAndRunFirstTurn('The app is stuck on the loading screen.');
      const response = await app.inject({ method: 'GET', url: `/tickets/${ticketId}/ai-session` });
      expect(response.statusCode).toBe(200);
      const body = response.json().data;
      expect(body.diagnosis).not.toBeNull();
      expect(typeof body.diagnosis.confidence).toBe('number');
      expect(body.diagnosis.confidence).toBeGreaterThanOrEqual(0);
      expect(body.diagnosis.confidence).toBeLessThanOrEqual(1);
    }, 60000);

    it('escalates rather than diagnosing when no knowledge exists for the product', async () => {
      const noKnowledgeProduct = `TEST_AI_DIAG_NOKB_${Date.now()}`;
      const product = await prismaClient.product.create({
        data: { externalProductId: noKnowledgeProduct, name: 'No KB product', status: 'active' },
      });
      const noKbSecret = generateCredentialSecret();
      await prismaClient.productIntegration.create({
        data: {
          productId: product.id,
          credentialRef: encryptCredential(noKbSecret),
          authMechanism: 'signed_token',
          allowedScope: { tenantIds: ['tenant-1'] },
          status: 'active',
          rateLimitPerMinute: 1000,
          rateLimitPerUserPerMinute: 1000,
        },
      });
      const token = issueIntegrationToken(noKbSecret, {
        externalProductId: noKnowledgeProduct,
        tenantId: 'tenant-1',
        userId: 'user-1',
      });
      const created = await app.inject({
        method: 'POST',
        url: '/v1/support/requests',
        headers: { authorization: `Bearer ${token}` },
        payload: {
          productId: noKnowledgeProduct,
          tenantId: 'tenant-1',
          userId: 'user-1',
          source: 'test',
          problem: 'Something is broken.',
        },
      });
      const ticketId = created.json().data.ticketId;
      await sessionsService.runFirstTurn(ticketId);

      const response = await app.inject({ method: 'GET', url: `/tickets/${ticketId}/ai-session` });
      expect(response.json().data.status).toBe('escalated');

      await prismaClient.aIDiagnosis.deleteMany({
        where: { session: { ticketId } },
      });
      await prismaClient.aISupportSession.deleteMany({ where: { ticketId } });
      await prismaClient.ticketMessage.deleteMany({ where: { ticketId } });
      await prismaClient.ticket.deleteMany({ where: { id: ticketId } });
      await prismaClient.problem.deleteMany({ where: { productId: product.id } });
      await prismaClient.productIntegration.deleteMany({ where: { productId: product.id } });
      await prismaClient.product.deleteMany({ where: { externalProductId: noKnowledgeProduct } });
    }, 60000);

    it('a low highThreshold/lowThreshold makes the same diagnosis less likely to escalate on confidence alone', async () => {
      await app.inject({
        method: 'PUT',
        url: `/admin/products/${externalProductId}/ai-policy`,
        payload: { highThreshold: 0.01, lowThreshold: 0.0, maxClarifyingQuestions: 3 },
      });
      const ticketId = await createTicketAndRunFirstTurn(
        'The app is stuck on the loading screen again.',
      );
      const response = await app.inject({ method: 'GET', url: `/tickets/${ticketId}/ai-session` });
      // With lowThreshold at 0, "escalate" from confidence alone is impossible — any remaining
      // escalation would have to come from FR-006 (no knowledge), which doesn't apply here.
      expect(response.json().data.status).not.toBe('escalated');
    }, 60000);
  },
);