import { describe, it, expect, beforeEach } from 'vitest';
import type { Database } from 'better-sqlite3';
import { createTestDb, createTestRepositories } from '../tests/testUtils.js';
import {
  PostsRepository,
  MessagesRepository,
  SuccessfulMessagesRepository,
  ConversationStateRepository,
} from '../src/database/repositories.js';
import { buildConversationState } from '../src/services/conversation-state.js';

describe('PostsRepository', () => {
  let postsRepo: PostsRepository;
  let messagesRepo: MessagesRepository;
  let db: Database;

  beforeEach(() => {
    const repos = createTestRepositories();
    postsRepo = repos.postsRepo;
    messagesRepo = repos.messagesRepo;
    db = repos.db;
  });

  it('inserts and retrieves a post by id', () => {
    postsRepo.insert({
      id: 'post1',
      subreddit: 'test',
      author: 'user1',
      title: 'Test Post',
      imageUrl: 'http://example.com/img.jpg',
      processedAt: Date.now(),
    });

    const post = postsRepo.getById('post1');
    expect(post).toBeDefined();
    expect(post!.id).toBe('post1');
    expect(post!.subreddit).toBe('test');
    expect(post!.author).toBe('user1');
    expect(post!.title).toBe('Test Post');
    expect(post!.imageUrl).toBe('http://example.com/img.jpg');
    expect(post!.messageSent).toBe(false);
    expect(post!.imageAnalysis).toBeNull();
    expect(post!.error).toBeNull();
  });

  it('checks if a post is processed', () => {
    expect(postsRepo.isProcessed('nonexistent')).toBe(false);

    postsRepo.insert({
      id: 'post2',
      subreddit: 'test',
      author: 'user2',
      title: 'Another Post',
      imageUrl: null,
      processedAt: Date.now(),
    });

    expect(postsRepo.isProcessed('post2')).toBe(true);
  });

  it('marks a message as sent', () => {
    postsRepo.insert({
      id: 'post3',
      subreddit: 'test',
      author: 'user3',
      title: 'Sent Post',
      imageUrl: 'http://example.com/img.jpg',
      processedAt: Date.now(),
    });

    postsRepo.markMessageSent('post3');
    const post = postsRepo.getById('post3');
    expect(post!.messageSent).toBe(true);
  });

  it('updates analysis and generated message', () => {
    postsRepo.insert({
      id: 'post4',
      subreddit: 'test',
      author: 'user4',
      title: 'Analysis Post',
      imageUrl: 'http://example.com/img.jpg',
      processedAt: Date.now(),
    });

    postsRepo.updateAnalysis('post4', 'Beautiful woman with blonde hair', 'Hey gorgeous...');
    const post = postsRepo.getById('post4');
    expect(post!.imageAnalysis).toBe('Beautiful woman with blonde hair');
    expect(post!.generatedMessage).toBe('Hey gorgeous...');
  });

  it('sets error on a post', () => {
    postsRepo.insert({
      id: 'post5',
      subreddit: 'test',
      author: 'user5',
      title: 'Error Post',
      imageUrl: 'http://example.com/img.jpg',
      processedAt: Date.now(),
    });

    postsRepo.setError('post5', 'Failed to download image');
    const post = postsRepo.getById('post5');
    expect(post!.error).toBe('Failed to download image');
  });

  it('gets posts by author (case insensitive)', () => {
    postsRepo.insert({ id: 'p1', subreddit: 'a', author: 'TestUser', title: 'T1', imageUrl: null, processedAt: Date.now() });
    postsRepo.insert({ id: 'p2', subreddit: 'b', author: 'testuser', title: 'T2', imageUrl: null, processedAt: Date.now() });
    postsRepo.insert({ id: 'p3', subreddit: 'c', author: 'TESTUSER', title: 'T3', imageUrl: null, processedAt: Date.now() });

    const results = postsRepo.getByAuthor('testuser');
    expect(results.length).toBe(3);
    // Should be ordered by processed_at DESC
    expect(results[0].id).toBe('p3');
    expect(results[2].id).toBe('p1');
  });

  it('limits getByAuthor to 10 results', () => {
    for (let i = 0; i < 15; i++) {
      postsRepo.insert({
        id: `pa${i}`,
        subreddit: 'test',
        author: 'bulkuser',
        title: `Bulk ${i}`,
        imageUrl: null,
        processedAt: Date.now() + i,
      });
    }
    const results = postsRepo.getByAuthor('bulkuser');
    expect(results.length).toBe(10);
  });

  it('returns undefined for non-existent post', () => {
    expect(postsRepo.getById('nonexistent')).toBeUndefined();
  });

  it('maps database columns to camelCase correctly', () => {
    postsRepo.insert({
      id: 'post6',
      subreddit: 'camelcase',
      author: 'user6',
      title: 'Camel Case Test',
      imageUrl: 'http://example.com/test.png',
      processedAt: 1234567890,
    });

    const post = postsRepo.getById('post6');
    expect(post).toMatchObject({
      id: 'post6',
      subreddit: 'camelcase',
      author: 'user6',
      title: 'Camel Case Test',
      imageUrl: 'http://example.com/test.png',
      processedAt: 1234567890,
      messageSent: false,
      imageAnalysis: null,
      generatedMessage: null,
      error: null,
    });
  });
});

describe('MessagesRepository', () => {
  let postsRepo: PostsRepository;
  let messagesRepo: MessagesRepository;
  let db: Database;

  beforeEach(() => {
    const repos = createTestRepositories();
    postsRepo = repos.postsRepo;
    messagesRepo = repos.messagesRepo;
    db = repos.db;
  });

  it('returns only sent timestamps within a rolling window', () => {
    postsRepo.insert({ id: 'window-post', subreddit: 'test', author: 'window-user', title: 'window', imageUrl: null, processedAt: 1 });
    messagesRepo.insert({ postId: 'window-post', recipient: 'window-user', subject: 's', message: 'm', sentAt: 100 });
    messagesRepo.insert({ postId: 'window-post', recipient: 'window-user', subject: 's', message: 'm', sentAt: 200 });

    expect(messagesRepo.getSentTimestampsSince(150)).toEqual([200]);
  });

  it('insertChat stores a chat-originated send and getByChatRoomId returns it', () => {
    const id = messagesRepo.insertChat({
      recipient: 'alice',
      subject: 'alice',
      message: 'hey there',
      sentAt: 1700000000000,
      chatRoomId: '!room123:reddit.com',
    });
    expect(id).toBeGreaterThan(0);

    const row = messagesRepo.getByChatRoomId('!room123:reddit.com');
    expect(row).toBeDefined();
    expect(row!.postId).toBeNull();
    expect(row!.chatRoomId).toBe('!room123:reddit.com');
    expect(row!.recipient).toBe('alice');
    expect(row!.gotResponse).toBe(false);

    messagesRepo.markGotResponse(id);
    const updated = messagesRepo.getByChatRoomId('!room123:reddit.com');
    expect(updated!.gotResponse).toBe(true);
  });

  it('chat-originated rows appear in getRecent and contribute to stats', () => {
    messagesRepo.insertChat({
      recipient: 'bob',
      subject: 'bob',
      message: 'hi',
      sentAt: Date.now(),
      chatRoomId: '!r1:reddit.com',
    });
    const recent = messagesRepo.getRecent(10);
    expect(recent.some((m) => m.chatRoomId === '!r1:reddit.com')).toBe(true);
  });

  it('inserts and retrieves a message', () => {
    const messageId = messagesRepo.insert({
      postId: 'post1',
      recipient: 'recipient1',
      subject: 'Hello',
      message: 'Hey there!',
      sentAt: Date.now(),
      strategyId: 'variant-a',
    });

    expect(messageId).toBeGreaterThan(0);

    const msg = messagesRepo.getByPostId('post1');
    expect(msg).toBeDefined();
    expect(msg!.postId).toBe('post1');
    expect(msg!.recipient).toBe('recipient1');
    expect(msg!.subject).toBe('Hello');
    expect(msg!.message).toBe('Hey there!');
    expect(msg!.strategyId).toBe('variant-a');
    expect(msg!.gotResponse).toBe(false);
  });

  it('retrieves recent messages', () => {
    const baseTime = Date.now();
    for (let i = 0; i < 5; i++) {
      messagesRepo.insert({
        postId: `post${i}`,
        recipient: `recipient${i}`,
        subject: `Subject ${i}`,
        message: `Message ${i}`,
        // Later i => more recent sentAt, so msg4 should come back first.
        sentAt: baseTime + i * 1000,
      });
    }

    const recent = messagesRepo.getRecent(3);
    expect(recent.length).toBe(3);
    // Should be ordered by sent_at DESC
    expect(recent[0].recipient).toBe('recipient4');
  });

  it('marks a message as having gotten a response', () => {
    messagesRepo.insert({
      postId: 'post1',
      recipient: 'recipient1',
      subject: 'Hello',
      message: 'Hey!',
      sentAt: Date.now(),
    });

    const msg = messagesRepo.getByPostId('post1');
    expect(msg!.gotResponse).toBe(false);

    messagesRepo.markGotResponse(msg!.id);
    const updated = messagesRepo.getByPostId('post1');
    expect(updated!.gotResponse).toBe(true);
    expect(updated!.responseCheckedAt).toBeDefined();
  });

  it('marks a message as checked without response', () => {
    messagesRepo.insert({
      postId: 'post1',
      recipient: 'recipient1',
      subject: 'Hello',
      message: 'Hey!',
      sentAt: Date.now(),
    });

    const msg = messagesRepo.getByPostId('post1');
    messagesRepo.markChecked(msg!.id);

    const updated = messagesRepo.getByPostId('post1');
    expect(updated!.gotResponse).toBe(false);
    expect(updated!.responseCheckedAt).toBeDefined();
  });

  it('gets the latest sent message by recipient with joined post info', () => {
    postsRepo.insert({
      id: 'post-a',
      subreddit: 'gonewild',
      author: 'alice',
      title: 'First post',
      imageUrl: null,
      processedAt: Date.now(),
    });
    postsRepo.insert({
      id: 'post-b',
      subreddit: 'gonewild',
      author: 'alice',
      title: 'Second post',
      imageUrl: null,
      processedAt: Date.now(),
    });

    const base = Date.now();
    messagesRepo.insert({ postId: 'post-a', recipient: 'alice', subject: 's', message: 'm', sentAt: base });
    messagesRepo.insert({ postId: 'post-b', recipient: 'alice', subject: 's', message: 'm', sentAt: base + 1000 });

    const latest = messagesRepo.getLatestByRecipient('alice');
    expect(latest).toBeDefined();
    expect(latest!.postId).toBe('post-b');
    expect(latest!.subreddit).toBe('gonewild');
    expect(latest!.postTitle).toBe('Second post');

    expect(messagesRepo.getLatestByRecipient('ALICE')).toBeDefined();
    expect(messagesRepo.getLatestByRecipient('nobody')).toBeUndefined();
  });

  it('checks if a message has been sent to a recipient', () => {
    expect(messagesRepo.hasSentTo('someone')).toBe(false);

    messagesRepo.insert({
      postId: 'post1',
      recipient: 'recipient1',
      subject: 'Hello',
      message: 'Hey!',
      sentAt: Date.now(),
    });

    expect(messagesRepo.hasSentTo('recipient1')).toBe(true);
    expect(messagesRepo.hasSentTo('someone')).toBe(false);
  });

  it('gets strategy stats from database', () => {
    const now = Date.now();

    messagesRepo.insert({ postId: 'p1', recipient: 'r1', subject: 's', message: 'm', sentAt: now, strategyId: 'variant-a' });
    messagesRepo.insert({ postId: 'p2', recipient: 'r2', subject: 's', message: 'm', sentAt: now, strategyId: 'variant-a' });
    messagesRepo.insert({ postId: 'p3', recipient: 'r3', subject: 's', message: 'm', sentAt: now, strategyId: 'variant-b' });

    messagesRepo.markGotResponse(1);
    messagesRepo.markGotResponse(3);

    const stats = messagesRepo.getStrategyStats();
    expect(stats.length).toBe(2);

    const variantA = stats.find(s => s.strategyId === 'variant-a');
    expect(variantA!.totalSent).toBe(2);
    expect(variantA!.totalResponses).toBe(1);
    expect(variantA!.responseRate).toBe(50);

    const variantB = stats.find(s => s.strategyId === 'variant-b');
    expect(variantB!.totalSent).toBe(1);
    expect(variantB!.totalResponses).toBe(1);
    expect(variantB!.responseRate).toBe(100);
  });

  it('excludes messages without strategy_id from stats', () => {
    messagesRepo.insert({ postId: 'p1', recipient: 'r1', subject: 's', message: 'm', sentAt: Date.now() });

    const stats = messagesRepo.getStrategyStats();
    expect(stats.length).toBe(0);
  });

  it('calculates 0 response rate when no messages sent', () => {
    // No messages inserted
    const stats = messagesRepo.getStrategyStats();
    expect(stats.length).toBe(0);
  });

  it('gets unchecked messages with correct time filters', () => {
    const now = Date.now();

    // Old message (2 hours ago, no check) - should be returned
    messagesRepo.insert({ postId: 'p1', recipient: 'r1', subject: 's', message: 'm', sentAt: now - 2 * 3600000 });

    // Recent message (30 min ago) - should NOT be returned (too young)
    messagesRepo.insert({ postId: 'p2', recipient: 'r2', subject: 's', message: 'm', sentAt: now - 30 * 60000 });

    // Already checked message - should NOT be returned
    messagesRepo.insert({ postId: 'p3', recipient: 'r3', subject: 's', message: 'm', sentAt: now - 2 * 3600000 });
    messagesRepo.markChecked(3);

    const unchecked = messagesRepo.getUncheckedMessages(60 * 60 * 1000, 6 * 60 * 60 * 1000, 10);
    expect(unchecked.length).toBe(1);
    expect(unchecked[0].postId).toBe('p1');
  });

  it('maps sent_at as number and response_checked_at as number | null', () => {
    messagesRepo.insert({
      postId: 'post1',
      recipient: 'r1',
      subject: 's',
      message: 'm',
      sentAt: 1234567890,
    });

    const msg = messagesRepo.getByPostId('post1');
    expect(typeof msg!.sentAt).toBe('number');
    expect(msg!.responseCheckedAt).toBeNull();
  });

  it('returns optional fields as undefined when not present', () => {
    messagesRepo.insert({
      postId: 'post1',
      recipient: 'r1',
      subject: 's',
      message: 'm',
      sentAt: Date.now(),
    });

    const msg = messagesRepo.getByPostId('post1');
    expect(msg!.subreddit).toBeUndefined();
    expect(msg!.postTitle).toBeUndefined();
    expect(msg!.postImageUrl).toBeUndefined();
  });
});

describe('SuccessfulMessagesRepository', () => {
  let successfulMessagesRepo: SuccessfulMessagesRepository;
  let db: Database;

  beforeEach(() => {
    const repos = createTestRepositories();
    successfulMessagesRepo = repos.successfulMessagesRepo;
    db = repos.db;
  });

  it('inserts and retrieves a successful message', () => {
    successfulMessagesRepo.insert({
      sentMessageId: 1,
      originalMessage: 'Hey gorgeous!',
      imageAnalysis: 'Blonde woman, rating 8/10',
      postTitle: 'My selfie',
      responseSnippet: 'Aww thanks!',
      subreddit: 'gonewild',
    });

    const recent = successfulMessagesRepo.getRecent(5);
    expect(recent.length).toBe(1);
    expect(recent[0].originalMessage).toBe('Hey gorgeous!');
    expect(recent[0].imageAnalysis).toBe('Blonde woman, rating 8/10');
    expect(recent[0].postTitle).toBe('My selfie');
    expect(recent[0].responseSnippet).toBe('Aww thanks!');
    expect(recent[0].subreddit).toBe('gonewild');
  });

  it('checks if a message already exists', () => {
    successfulMessagesRepo.insert({
      sentMessageId: 1,
      originalMessage: 'Unique message',
      imageAnalysis: null,
      postTitle: null,
      responseSnippet: null,
      subreddit: null,
    });

    expect(successfulMessagesRepo.existsByMessage('Unique message')).toBe(true);
    expect(successfulMessagesRepo.existsByMessage('Non-existent')).toBe(false);
  });

  it('gets weighted examples for a subreddit', () => {
    successfulMessagesRepo.insert({ sentMessageId: 1, originalMessage: 'Msg 1', imageAnalysis: null, postTitle: null, responseSnippet: null, subreddit: 'gonewild' });
    successfulMessagesRepo.insert({ sentMessageId: 2, originalMessage: 'Msg 2', imageAnalysis: null, postTitle: null, responseSnippet: null, subreddit: 'gonewild' });
    successfulMessagesRepo.insert({ sentMessageId: 3, originalMessage: 'Msg 3', imageAnalysis: null, postTitle: null, responseSnippet: null, subreddit: 'homemadesfW' });

    const examples = successfulMessagesRepo.getWeightedExamples('gonewild', 3);
    // Returns up to `limit` examples weighted toward the target subreddit but
    // including off-subreddit fallback rows when there's headroom.
    expect(examples.length).toBe(3);
    expect(examples[0].subreddit).toBe('gonewild');
    expect(examples[1].subreddit).toBe('gonewild');
  });

  it('falls back to recent when no subreddit match', () => {
    successfulMessagesRepo.insert({ sentMessageId: 1, originalMessage: 'Msg 1', imageAnalysis: null, postTitle: null, responseSnippet: null, subreddit: 'gonewild' });
    successfulMessagesRepo.insert({ sentMessageId: 2, originalMessage: 'Msg 2', imageAnalysis: null, postTitle: null, responseSnippet: null, subreddit: 'other' });

    const examples = successfulMessagesRepo.getWeightedExamples('nonexistent', 3);
    expect(examples.length).toBe(2);
  });

  it('counts successful messages', () => {
    expect(successfulMessagesRepo.count()).toBe(0);

    successfulMessagesRepo.insert({ sentMessageId: 1, originalMessage: 'Msg 1', imageAnalysis: null, postTitle: null, responseSnippet: null, subreddit: null });
    successfulMessagesRepo.insert({ sentMessageId: 2, originalMessage: 'Msg 2', imageAnalysis: null, postTitle: null, responseSnippet: null, subreddit: null });

    expect(successfulMessagesRepo.count()).toBe(2);
  });

  it('handles null fields correctly', () => {
    successfulMessagesRepo.insert({
      sentMessageId: null,
      originalMessage: 'No context',
      imageAnalysis: null,
      postTitle: null,
      responseSnippet: null,
      subreddit: null,
    });

    const recent = successfulMessagesRepo.getRecent(1);
    expect(recent[0].sentMessageId).toBeNull();
    expect(recent[0].imageAnalysis).toBeNull();
    expect(recent[0].postTitle).toBeNull();
    expect(recent[0].responseSnippet).toBeNull();
    expect(recent[0].subreddit).toBeNull();
  });

  it('returns most recent examples first', () => {
    for (let i = 0; i < 5; i++) {
      successfulMessagesRepo.insert({
        sentMessageId: i,
        originalMessage: `Msg ${i}`,
        imageAnalysis: null,
        postTitle: null,
        responseSnippet: null,
        subreddit: null,
      });
    }

    const recent = successfulMessagesRepo.getRecent(3);
    expect(recent[0].originalMessage).toBe('Msg 4');
    expect(recent[2].originalMessage).toBe('Msg 2');
  });
});

describe('ConversationStateRepository', () => {
  it('persists state by room id and replaces it on later saves', () => {
    const db = createTestDb();
    const repo = new ConversationStateRepository(db);
    const original = buildConversationState([{ sender: 'Me', text: '32M UK, married.', isSelf: true }]);
    repo.save('!room:reddit.com', original);

    expect(repo.get('!room:reddit.com')).toMatchObject({
      persona: { age: 32, location: 'UK', relationshipStatus: 'married' },
    });

    const updated = buildConversationState([{ sender: 'Me', text: '34M UK.', isSelf: true }]);
    repo.save('!room:reddit.com', updated);
    expect(repo.get('!room:reddit.com')?.persona.age).toBe(34);
    expect(repo.get('missing')).toBeUndefined();
  });
});

describe('Repository edge cases', () => {
  it('handles special characters in post titles', () => {
    const repos = createTestRepositories();
    repos.postsRepo.insert({
      id: 'special',
      subreddit: 'test',
      author: "user's \"quotes\"",
      title: 'Title with <html> & "special" chars',
      imageUrl: null,
      processedAt: Date.now(),
    });

    const post = repos.postsRepo.getById('special');
    expect(post!.author).toBe("user's \"quotes\"");
    expect(post!.title).toBe('Title with <html> & "special" chars');
  });

  it('handles very long messages', () => {
    const repos = createTestRepositories();
    const longMessage = 'x'.repeat(10000);

    repos.messagesRepo.insert({
      postId: 'post1',
      recipient: 'r1',
      subject: 's',
      message: longMessage,
      sentAt: Date.now(),
    });

    const msg = repos.messagesRepo.getByPostId('post1');
    expect(msg!.message.length).toBe(10000);
  });

  it('handles empty string fields', () => {
    const repos = createTestRepositories();
    repos.postsRepo.insert({
      id: 'empty',
      subreddit: '',
      author: '',
      title: '',
      imageUrl: '',
      processedAt: Date.now(),
    });

    const post = repos.postsRepo.getById('empty');
    expect(post!.subreddit).toBe('');
    expect(post!.author).toBe('');
    expect(post!.title).toBe('');
  });

  it('handles duplicate post insert (should throw due to PRIMARY KEY)', () => {
    const repos = createTestRepositories();
    repos.postsRepo.insert({ id: 'dup', subreddit: 't', author: 'a', title: 't', imageUrl: null, processedAt: Date.now() });

    expect(() => {
      repos.postsRepo.insert({ id: 'dup', subreddit: 't', author: 'a', title: 't', imageUrl: null, processedAt: Date.now() });
    }).toThrow();
  });

  it('handles messages with strategy_id null', () => {
    const repos = createTestRepositories();
    const id = repos.messagesRepo.insert({
      postId: 'p1',
      recipient: 'r1',
      subject: 's',
      message: 'm',
      sentAt: Date.now(),
    });

    const msg = repos.messagesRepo.getByPostId('p1');
    expect(msg!.strategyId).toBeNull();
  });
});