import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { buildApp } from '@/app';
import { prismaClient } from '@/infrastructure/database';
import { FastifyInstance } from 'fastify';
import { loginAs, authHeader } from '../helpers/auth';
import {
  encryptCredential,
  generateCredentialSecret,
  issueIntegrationToken,
} from '@/modules/catalog/products';
import { escalationService } from '@/modules/orchestration/escalation';

/**
 * specs/016-load-concurrency-testing User Story 3 / FR-003 / SC-003: the same escalation
 * trigger delivered more than once for the same ticket (e.g. two overlapping breach-sweep
 * passes, or a re-delivered job) must result in exactly one EscalationEvent and exactly one
 * resulting reassignment — never two. Before research.md §3's fix (the
 * `escalation_events_ticket_rule_unique` partial unique index plus
 * EscalationEventRepository.create's catch-and-absorb), `EscalationService.fire` unconditionally
 * created a new event and reassigned on every call, with no dedup mechanism at all.
 */
describe('Escalation idempotency (User Story 3)', () => {
  let app: FastifyInstance;
  let authToken: string;
  const externalProductId = `TEST_ESCALATION_IDEMPOTENCY_PROD_${Date.now()}`;
  const skillTag = `escalation_idempotency_skill_${Date.now()}`;
  let productId: string;
  let teamId: string;
  let agentId: string;
  let nodeId: string;
  let policyId: string;
  let escalationPolicyId: string;
  let secret: string;
  const createdTicketIds: string[] = [];

  async function createTicketAndAssign(): 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: `Escalation idempotency test ${Date.now()}-${Math.random()}`,
      },
    });
    expect(created.statusCode).toBe(202);
    const ticketId = created.json().data.ticketId as string;
    createdTicketIds.push(ticketId);

    const ticket = await prismaClient.ticket.findUniqueOrThrow({ where: { id: ticketId } });
    await app.inject({
      method: 'PATCH',
      url: `/tickets/${ticketId}/status`,
      headers: authHeader(authToken),
      payload: { status: 'HUMAN_ESCALATION', expectedVersion: ticket.version },
    });

    // Force the run overdue — the concrete condition handleBreach fires for in production, via
    // the breach sweep.
    await prismaClient.sLARun.update({
      where: { ticketId },
      data: { resolutionDueAt: new Date(Date.now() - 60_000) },
    });

    return ticketId;
  }

  beforeAll(async () => {
    app = await buildApp();
    authToken = await loginAs(app, 'ADMIN');

    const product = await prismaClient.product.create({
      data: { externalProductId, name: 'Escalation Idempotency Test Product', status: 'active' },
    });
    productId = product.id;
    secret = generateCredentialSecret();
    await prismaClient.productIntegration.create({
      data: {
        productId,
        credentialRef: encryptCredential(secret),
        authMechanism: 'signed_token',
        allowedScope: { tenantIds: ['tenant-1'] },
        status: 'active',
        rateLimitPerMinute: 1000,
        rateLimitPerUserPerMinute: 1000,
      },
    });

    const team = await app.inject({
      method: 'POST',
      url: '/admin/teams',
      headers: authHeader(authToken),
      payload: { name: `Escalation Idempotency Team ${Date.now()}` },
    });
    teamId = team.json().data.id;

    const agent = await app.inject({
      method: 'POST',
      url: `/admin/teams/${teamId}/agents`,
      headers: authHeader(authToken),
      payload: { name: 'Escalation Idempotency Agent' },
    });
    agentId = agent.json().data.id;
    await app.inject({
      method: 'PUT',
      url: `/admin/agents/${agentId}/skills/${skillTag}`,
      headers: authHeader(authToken),
      payload: { level: 3 },
    });

    const node = await app.inject({
      method: 'POST',
      url: '/admin/hierarchy-nodes',
      headers: authHeader(authToken),
      payload: {
        name: 'Escalation Idempotency Node',
        order: 0,
        productScope: [externalProductId],
        skills: [skillTag],
        assignmentStrategy: 'ROUND_ROBIN',
      },
    });
    nodeId = node.json().data.id;

    const policy = await app.inject({
      method: 'POST',
      url: '/admin/sla-policies',
      headers: authHeader(authToken),
      payload: {
        name: 'Escalation Idempotency SLA Policy',
        productId,
        firstResponseMinutes: 30,
        resolutionMinutes: 240,
      },
    });
    policyId = policy.json().data.id;

    const escPolicy = await app.inject({
      method: 'POST',
      url: '/admin/escalation-policies',
      headers: authHeader(authToken),
      payload: { name: 'Escalation Idempotency Policy', productId },
    });
    escalationPolicyId = escPolicy.json().data.id;

    await app.inject({
      method: 'POST',
      url: `/admin/escalation-policies/${escalationPolicyId}/rules`,
      headers: authHeader(authToken),
      payload: {
        triggerType: 'resolution_breach',
        condition: {},
        targetNodeId: nodeId,
        notify: {},
      },
    });
  });

  afterAll(async () => {
    const ticketFilter = { ticketId: { in: createdTicketIds } };
    await prismaClient.escalationEvent.deleteMany({ where: ticketFilter });
    await prismaClient.escalationRule.deleteMany({ where: { targetNodeId: nodeId } });
    await prismaClient.escalationPolicy.deleteMany({ where: { id: escalationPolicyId } });
    await prismaClient.sLARun.deleteMany({ where: ticketFilter });
    await prismaClient.sLAPolicy.deleteMany({ where: { id: policyId } });
    await prismaClient.assignmentHistory.deleteMany({ where: ticketFilter });
    await prismaClient.assignment.deleteMany({ where: ticketFilter });
    await prismaClient.hierarchyNode.deleteMany({ where: { id: nodeId } });
    await prismaClient.agentSkill.deleteMany({ where: { agentId } });
    await prismaClient.agent.deleteMany({ where: { teamId } });
    await prismaClient.team.deleteMany({ where: { id: teamId } });
    await prismaClient.ticketMessage.deleteMany({ where: ticketFilter });
    await prismaClient.ticket.deleteMany({ where: { id: { in: createdTicketIds } } });
    await prismaClient.problem.deleteMany({ where: { productId } });
    await prismaClient.productIntegration.deleteMany({ where: { productId } });
    await prismaClient.product.deleteMany({ where: { id: productId } });
    await app.close();
  });

  it('results in exactly one escalation event and one assignment when the same trigger fires twice concurrently', async () => {
    const ticketId = await createTicketAndAssign();

    await Promise.all([
      escalationService.handleBreach(ticketId, 'resolution_breach'),
      escalationService.handleBreach(ticketId, 'resolution_breach'),
    ]);

    const events = await prismaClient.escalationEvent.findMany({ where: { ticketId } });
    expect(events.length).toBe(1);

    const currentAssignments = await prismaClient.assignment.findMany({
      where: { ticketId, isCurrent: true },
    });
    expect(currentAssignments.length).toBe(1);
  });

  it(
    'holds consistently across 10 repeated runs (SC-003: zero duplicate outcomes)',
    async () => {
      for (let run = 0; run < 10; run++) {
        const ticketId = await createTicketAndAssign();

        await Promise.all([
          escalationService.handleBreach(ticketId, 'resolution_breach'),
          escalationService.handleBreach(ticketId, 'resolution_breach'),
          escalationService.handleBreach(ticketId, 'resolution_breach'),
        ]);

        const events = await prismaClient.escalationEvent.findMany({ where: { ticketId } });
        expect(events.length).toBe(1);

        const currentAssignments = await prismaClient.assignment.findMany({
          where: { ticketId, isCurrent: true },
        });
        expect(currentAssignments.length).toBe(1);
      }
    },
    60000,
  );
});