import fs from 'fs/promises';
import os from 'os';
import path from 'path';
import { afterEach, describe, expect, it, vi } from 'vitest';
import { ConversationOutcomesRepository, ConversationStateRepository } from '../src/database/repositories.js';
import { ChatCache } from '../src/services/chat/cache.js';
import { MatrixClient } from '../src/services/chat/matrix/client.js';
import type { MatrixSyncResponse } from '../src/services/chat/matrix/types.js';
import { ChatService } from '../src/services/chat/service.js';
import { createMockLogger } from './mockLogger.js';
import { authenticatedAccountAuth, createTestDb, createTestRepositories } from './testUtils.js';

const credentials = {
  homeserver: 'https://matrix.example.test',
  accessToken: 'token',
  userId: '@me:example.test',
  capturedAt: Date.now(),
};

const temporaryDirectories: string[] = [];
const openDatabases: Array<ReturnType<typeof createTestDb>> = [];

afterEach(async () => {
  for (const database of openDatabases.splice(0)) database.close();
  await Promise.all(temporaryDirectories.splice(0).map((directory) =>
    fs.rm(directory, { recursive: true, force: true })));
});

describe('ChatService inbound media notifications', () => {
  it('reports an inbound image exactly once, however often the chat re-syncs', async () => {
    const fixture = await createFixture({ inboundMediaCount: 2 });
    const received: unknown[] = [];
    fixture.service.setMediaReceivedListener((info) => received.push(info));

    await fixture.service.runStartupSync();

    expect(received).toEqual([{ conversationId: fixture.roomId, username: 'alice', count: 2 }]);
    expect(fixture.repos.messagesRepo.getByChatRoomId(fixture.roomId)).toMatchObject({ gotImage: true });

    await fixture.service.runStartupSync();
    expect(received).toHaveLength(1);
  });

  it('stays quiet for a text-only conversation', async () => {
    const fixture = await createFixture({ inboundMediaCount: 0 });
    const received: unknown[] = [];
    fixture.service.setMediaReceivedListener((info) => received.push(info));

    await fixture.service.runStartupSync();

    expect(received).toEqual([]);
  });

  it('records the image even when the listener throws', async () => {
    const fixture = await createFixture({ inboundMediaCount: 1 });
    fixture.service.setMediaReceivedListener(() => { throw new Error('notifier exploded'); });

    await fixture.service.runStartupSync();

    expect(fixture.repos.messagesRepo.getByChatRoomId(fixture.roomId)).toMatchObject({ gotImage: true });
  });
});

async function createFixture(options: { inboundMediaCount: number }) {
  const logger = createMockLogger();
  const directory = await fs.mkdtemp(path.join(os.tmpdir(), 'chat-media-notify-'));
  temporaryDirectories.push(directory);
  const cacheFile = path.join(directory, 'chat-cache.json');
  const db = createTestDb();
  openDatabases.push(db);
  const repos = createTestRepositories(db);
  const outcomes = new ConversationOutcomesRepository(db);
  const conversationStates = new ConversationStateRepository(db);
  const now = Date.now();
  const roomId = '!alice:example.test';

  repos.postsRepo.insert({
    id: 'source-post', subreddit: 'example', author: 'alice', title: 'Source',
    imageUrl: null, processedAt: now - 10_000,
  });
  repos.messagesRepo.insert({
    postId: 'source-post', recipient: 'alice', subject: 'alice', message: 'Hello',
    sentAt: now - 9_000, strategyId: 'direct', chatRoomId: roomId,
  });

  const media = Array.from({ length: options.inboundMediaCount }, (_unused, index) => ({
    originalUrl: `mxc://example.test/image-${index}`,
    localPath: `/data/media/image-${index}.jpg`,
    fileName: `image-${index}.jpg`,
  }));

  await fs.writeFile(cacheFile, JSON.stringify({
    version: 1,
    savedAt: now - 60_000,
    chats: [{
      username: 'alice',
      roomName: 'alice',
      lastMessageTime: now - 2_000,
      lastMessageSnippet: '[Image]',
      isFromUs: false,
      unread: false,
      roomId,
      messages: [
        { sender: 'Me', text: 'Hello', timestamp: now - 5_000, isSelf: true },
        {
          sender: 'alice',
          text: media.length > 0 ? '[Image]' : 'Thanks!',
          timestamp: now - 2_000,
          isSelf: false,
          ...(media.length > 0 ? { media } : {}),
        },
      ],
    }],
    nextBatch: 's1',
    lastFullSyncAt: now - 120_000,
    lastDeltaSyncAt: now - 60_000,
    cooldown: null,
  }), 'utf8');

  const matrix = new MatrixClient(credentials, logger, { minRequestIntervalMs: 0 });
  matrix.sync = vi.fn(async (): Promise<MatrixSyncResponse> => ({ next_batch: 's2' })) as typeof matrix.sync;
  const cache = new ChatCache(logger, cacheFile);
  const service = new ChatService(
    matrix,
    logger,
    repos.successfulMessagesRepo,
    undefined,
    undefined,
    undefined,
    cache,
    repos.messagesRepo,
    undefined,
    authenticatedAccountAuth,
    outcomes,
    conversationStates,
  );
  await service.loadCache();

  return { repos, roomId, service };
}