/**
 * @fileoverview Tests for hook-event-routes route handlers.
 *
 * Uses app.inject() — no real HTTP ports needed.
 * Port: N/A (app.inject doesn't open ports)
 *
 * These tests assert the UNIFORM response envelope (stable HTTP contract):
 *   success -> 2xx, { success: true, data: <payload> }
 *   error   -> 4xx/5xx, { success: false, error, errorCode }
 * The production server applies this via a preSerialization hook (server.ts).
 * The shared route harness doesn't install it, so we build a local harness here
 * that mirrors production: the same preSerialization envelope hook + the shared
 * route error handler, so assertions match the real wire format.
 */

import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import Fastify, { type FastifyInstance } from 'fastify';
import fastifyCookie from '@fastify/cookie';
import { createMockRouteContext, type MockRouteContext } from '../mocks/index.js';
import { installRouteErrorHandler } from '../../src/web/route-error-handler.js';
import { ApiErrorCode, httpStatusForErrorCode } from '../../src/types.js';
import { registerHookEventRoutes } from '../../src/web/routes/hook-event-routes.js';

interface LocalHarness {
  app: FastifyInstance;
  ctx: MockRouteContext;
}

/**
 * Build a Fastify instance that mirrors production's uniform-envelope behavior
 * (server.ts preSerialization hook) so the test wire format matches the contract:
 * bare payloads become { success: true, data }, and { success:false } error
 * envelopes get the conventional HTTP status from their errorCode.
 */
async function createEnvelopeHarness(
  registerFn: (app: FastifyInstance, ctx: MockRouteContext) => void
): Promise<LocalHarness> {
  const app = Fastify({ logger: false });
  await app.register(fastifyCookie);

  const ctx = createMockRouteContext();
  registerFn(app, ctx);

  // Mirror production uniform response envelope (server.ts).
  app.addHook('preSerialization', (req, reply, payload: unknown, done) => {
    if (!req.url.startsWith('/api')) return done(null, payload);
    if (payload === null || typeof payload !== 'object') return done(null, payload);
    if (Buffer.isBuffer(payload) || typeof (payload as { pipe?: unknown }).pipe === 'function') {
      return done(null, payload);
    }
    const p = payload as { success?: unknown; errorCode?: unknown };
    if (p.success === false) {
      if (reply.statusCode === 200 && typeof p.errorCode === 'string') {
        reply.code(httpStatusForErrorCode(p.errorCode as ApiErrorCode));
      }
      return done(null, payload);
    }
    if (p.success === true) return done(null, payload);
    return done(null, { success: true, data: payload });
  });

  installRouteErrorHandler(app);
  await app.ready();

  return { app, ctx };
}

describe('hook-event-routes', () => {
  let harness: LocalHarness;

  beforeEach(async () => {
    harness = await createEnvelopeHarness(registerHookEventRoutes);
  });

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

  // ========== POST /api/hook-event ==========

  describe('POST /api/hook-event', () => {
    it('accepts a valid hook event and broadcasts it', async () => {
      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'stop',
          sessionId: harness.ctx._sessionId,
          data: null,
        },
      });
      expect(res.statusCode).toBe(200);
      const body = JSON.parse(res.body);
      expect(body.success).toBe(true);
      expect(harness.ctx.broadcast).toHaveBeenCalledWith(
        'hook:stop',
        expect.objectContaining({ sessionId: harness.ctx._sessionId })
      );
    });

    it('sends push notifications for hook events', async () => {
      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'idle_prompt',
          sessionId: harness.ctx._sessionId,
          data: null,
        },
      });
      expect(res.statusCode).toBe(200);
      expect(harness.ctx.sendPushNotifications).toHaveBeenCalledWith(
        'hook:idle_prompt',
        expect.objectContaining({ sessionId: harness.ctx._sessionId })
      );
    });

    it('returns 404 for unknown session', async () => {
      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'stop',
          sessionId: 'nonexistent-session',
          data: null,
        },
      });
      expect(res.statusCode).toBe(404);
      const body = JSON.parse(res.body);
      expect(body.success).toBe(false);
      expect(body.error).toBeDefined();
    });

    it('rejects invalid event type', async () => {
      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'invalid_event_type',
          sessionId: harness.ctx._sessionId,
          data: null,
        },
      });
      expect(res.statusCode).toBe(400);
      const body = JSON.parse(res.body);
      expect(body.success).toBe(false);
    });

    it('rejects missing sessionId', async () => {
      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'stop',
        },
      });
      expect(res.statusCode).toBe(400);
      const body = JSON.parse(res.body);
      expect(body.success).toBe(false);
    });

    it('signals respawn controller on stop event', async () => {
      const mockController = {
        signalStopHook: vi.fn(),
        signalElicitation: vi.fn(),
        signalIdlePrompt: vi.fn(),
      };
      harness.ctx.respawnControllers.set(harness.ctx._sessionId, mockController as never);

      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'stop',
          sessionId: harness.ctx._sessionId,
          data: null,
        },
      });
      expect(res.statusCode).toBe(200);
      expect(mockController.signalStopHook).toHaveBeenCalled();
    });

    it('signals respawn controller on elicitation_dialog event', async () => {
      const mockController = {
        signalStopHook: vi.fn(),
        signalElicitation: vi.fn(),
        signalIdlePrompt: vi.fn(),
      };
      harness.ctx.respawnControllers.set(harness.ctx._sessionId, mockController as never);

      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'elicitation_dialog',
          sessionId: harness.ctx._sessionId,
          data: null,
        },
      });
      expect(res.statusCode).toBe(200);
      expect(mockController.signalElicitation).toHaveBeenCalled();
    });

    it('signals respawn controller on idle_prompt event', async () => {
      const mockController = {
        signalStopHook: vi.fn(),
        signalElicitation: vi.fn(),
        signalIdlePrompt: vi.fn(),
      };
      harness.ctx.respawnControllers.set(harness.ctx._sessionId, mockController as never);

      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'idle_prompt',
          sessionId: harness.ctx._sessionId,
          data: null,
        },
      });
      expect(res.statusCode).toBe(200);
      expect(mockController.signalIdlePrompt).toHaveBeenCalled();
    });

    it('records hook event in run summary tracker', async () => {
      const mockTracker = { recordHookEvent: vi.fn() };
      harness.ctx.runSummaryTrackers.set(harness.ctx._sessionId, mockTracker as never);

      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'stop',
          sessionId: harness.ctx._sessionId,
          data: { tool_name: 'bash' },
        },
      });
      expect(res.statusCode).toBe(200);
      expect(mockTracker.recordHookEvent).toHaveBeenCalledWith('stop', expect.any(Object));
    });

    it('starts transcript watcher when transcript_path is provided', async () => {
      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'stop',
          sessionId: harness.ctx._sessionId,
          data: { transcript_path: '/home/user/.claude/transcript.jsonl' },
        },
      });
      expect(res.statusCode).toBe(200);
      expect(harness.ctx.startTranscriptWatcher).toHaveBeenCalledWith(
        harness.ctx._sessionId,
        '/home/user/.claude/transcript.jsonl'
      );
    });

    it('accepts valid data payload with extra fields', async () => {
      const res = await harness.app.inject({
        method: 'POST',
        url: '/api/hook-event',
        payload: {
          event: 'permission_prompt',
          sessionId: harness.ctx._sessionId,
          data: { tool_name: 'bash', command: 'ls -la' },
        },
      });
      expect(res.statusCode).toBe(200);
      const body = JSON.parse(res.body);
      expect(body.success).toBe(true);
    });
  });
});