/**
 * @fileoverview Claude transcript normalization tests for the response viewer.
 *
 * Uses app.inject() with a temporary HOME; no real ports or user transcripts.
 * Port: N/A
 */

import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import Fastify, { type FastifyInstance } from 'fastify';
import fastifyCookie from '@fastify/cookie';
import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { installRouteErrorHandler } from '../../src/web/route-error-handler.js';
import { registerSessionRoutes } from '../../src/web/routes/session-routes.js';
import { ApiErrorCode, httpStatusForErrorCode } from '../../src/types.js';
import { createMockRouteContext, type MockRouteContext } from '../mocks/index.js';

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

async function createEnvelopeHarness(): Promise<LocalHarness> {
  const app = Fastify({ logger: false });
  await app.register(fastifyCookie);
  const ctx = createMockRouteContext();
  registerSessionRoutes(app, ctx);

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

  installRouteErrorHandler(app);
  await app.ready();
  return { app, ctx };
}

const userEntry = (text: string, extras: Record<string, unknown> = {}) => ({
  type: 'user',
  timestamp: '2026-07-21T00:00:00Z',
  message: { content: [{ type: 'text', text }] },
  ...extras,
});

const assistantEntry = (text: string, timestamp: string) => ({
  type: 'assistant',
  timestamp,
  message: { content: [{ type: 'text', text }] },
});

describe('GET /api/sessions/:id/last-response (claude)', () => {
  let harness: LocalHarness;
  let testHome: string;
  let previousHome: string | undefined;

  beforeEach(async () => {
    testHome = mkdtempSync(join(tmpdir(), 'codeman-claude-rv-'));
    previousHome = process.env.HOME;
    process.env.HOME = testHome;
    harness = await createEnvelopeHarness();
  });

  afterEach(async () => {
    if (previousHome === undefined) delete process.env.HOME;
    else process.env.HOME = previousHome;
    rmSync(testHome, { recursive: true, force: true });
    await harness.app.close();
  });

  function writeTranscript(sessionId: string, entries: unknown[]): void {
    const projectDir = join(testHome, '.claude', 'projects', '-workspace');
    mkdirSync(projectDir, { recursive: true });
    writeFileSync(join(projectDir, `${sessionId}.jsonl`), entries.map((entry) => JSON.stringify(entry)).join('\n'));
  }

  async function getLastResponse(sessionId: string, full = false) {
    const response = await harness.app.inject({
      method: 'GET',
      url: `/api/sessions/${sessionId}/last-response${full ? '?context=full' : ''}`,
    });
    return { response, body: JSON.parse(response.body) };
  }

  it('recovers a placeholder tmux session by UUID prefix and groups JSONL fragments into turns', async () => {
    const restoredId = 'restored-40568a29';
    const conversationId = '40568a29-d4eb-4eb6-b671-8401428e4f39';
    const session = harness.ctx._session as typeof harness.ctx._session & {
      claudeSessionId: string;
      adoptClaudeSessionId: ReturnType<typeof vi.fn>;
    };
    harness.ctx.sessions.delete(session.id);
    session.id = restoredId;
    session.mode = 'claude';
    session.workingDir = '/wrong/recovered/cwd';
    session.claudeSessionId = restoredId;
    session.adoptClaudeSessionId = vi.fn((newId: string) => {
      session.claudeSessionId = newId;
    });
    harness.ctx.sessions.set(restoredId, session);

    writeTranscript(conversationId, [
      userEntry('first prompt'),
      userEntry('first prompt'), // restore replay before any assistant output
      { type: 'assistant', message: { content: [{ type: 'thinking', thinking: 'hidden' }] } },
      assistantEntry('Checking the files.', '2026-07-21T00:00:01Z'),
      { type: 'assistant', message: { content: [{ type: 'tool_use', id: 'tool-1' }] } },
      { type: 'user', message: { content: [{ type: 'tool_result', tool_use_id: 'tool-1' }] } },
      assistantEntry('Checking the files.', '2026-07-21T00:00:02Z'), // replayed snapshot
      assistantEntry('The first result is ready.', '2026-07-21T00:00:03Z'),
      userEntry('[Image dimensions generated by the CLI]', { isMeta: true }),
      userEntry('<command-name>/status</command-name>'),
      userEntry('Another Claude session sent a message: <teammate-message>done</teammate-message>'),
      userEntry('<task-notification>background agent completed</task-notification>'),
      userEntry('This session is being continued from a previous conversation', { isCompactSummary: true }),
      userEntry('second prompt'),
      assistantEntry('First half.', '2026-07-21T00:00:04Z'),
      { ...assistantEntry('sidechain text', '2026-07-21T00:00:05Z'), isSidechain: true },
      assistantEntry('Second half.', '2026-07-21T00:00:06Z'),
    ]);

    const full = await getLastResponse(restoredId, true);
    expect(full.response.statusCode).toBe(200);
    expect(full.body.data).toEqual({
      text: 'Second half.',
      timestamp: '2026-07-21T00:00:06Z',
      messages: [
        { role: 'user', text: 'first prompt', timestamp: '2026-07-21T00:00:00Z' },
        {
          role: 'assistant',
          text: 'Checking the files.\n\nThe first result is ready.',
          timestamp: '2026-07-21T00:00:03Z',
        },
        { role: 'user', text: 'second prompt', timestamp: '2026-07-21T00:00:00Z' },
        { role: 'assistant', text: 'First half.\n\nSecond half.', timestamp: '2026-07-21T00:00:06Z' },
      ],
    });
    expect(session.adoptClaudeSessionId).toHaveBeenCalledWith(conversationId);

    const brief = await getLastResponse(restoredId);
    expect(brief.body.data).toEqual({ text: 'Second half.', timestamp: '2026-07-21T00:00:06Z' });
  });

  it('keeps an identical user prompt when it occurs again after an assistant response', async () => {
    const sessionId = harness.ctx._session.id;
    const session = harness.ctx._session as typeof harness.ctx._session & {
      claudeSessionId: string;
      adoptClaudeSessionId: ReturnType<typeof vi.fn>;
    };
    session.claudeSessionId = sessionId;
    session.adoptClaudeSessionId = vi.fn();
    writeTranscript(sessionId, [
      userEntry('continue'),
      assistantEntry('First answer.', '2026-07-21T00:00:01Z'),
      userEntry('continue'),
      assistantEntry('Second answer.', '2026-07-21T00:00:02Z'),
    ]);

    const { body } = await getLastResponse(sessionId, true);
    expect(body.data.messages.map((message: { role: string; text: string }) => [message.role, message.text])).toEqual([
      ['user', 'continue'],
      ['assistant', 'First answer.'],
      ['user', 'continue'],
      ['assistant', 'Second answer.'],
    ]);
  });
});