import { describe, expect, it, vi } from 'vitest';
import { ConversationAutomationService } from '../src/services/conversation-automation.js';
import type { ConversationState } from '../src/services/conversation-state.js';

function harness(
  sellerKeywords: string[] = [],
  sellerDomains: string[] = [],
  openerSentAt: number | null = 0,
  subredditConversation?: { mode: 'legacy' | 'r4r' | 'manual'; maxAutomatedTurns: number },
) {
  let saved: ConversationState | undefined;
  const chat = {
    refreshTopChats: vi.fn().mockResolvedValue(undefined),
    getCachedConversations: vi.fn().mockResolvedValue([]),
    sendChatMessage: vi.fn().mockResolvedValue(true),
  };
  const ai = {
    generateMediaAsk: vi.fn().mockResolvedValue('Would you be comfortable sharing a selfie?'),
    generateReply: vi.fn().mockResolvedValue('That sounds fun. What got you into it?'),
  };
  const states = {
    get: vi.fn(() => saved),
    save: vi.fn((_id: string, state: ConversationState) => { saved = structuredClone(state); }),
  };
  const openers = {
    getByChatRoomId: vi.fn(() => openerSentAt === null
      ? undefined
      : { sentAt: openerSentAt, subreddit: 'r4r' }),
  };
  const claims = {
    tryClaim: vi.fn(() => true),
    markSent: vi.fn(() => true),
  };
  const rateLimiter = {
    throttle: vi.fn(async (operation: () => Promise<boolean>) => operation()),
  };
  const logger = { info: vi.fn() };
  const service = new ConversationAutomationService(
    chat as never, ai as never, states as never, openers as never, claims, rateLimiter as never, logger as never,
    false, sellerKeywords, sellerDomains,
    () => subredditConversation ? [{
      name: 'r4r', enabled: true, type: 'chat', tone: 'default', conversation: subredditConversation,
    }] : [],
  );
  return { service, chat, ai, states, openers, claims, getSaved: () => saved };
}

function incoming(turn: number, text = `reply ${turn}`, media?: Array<{ originalUrl: string; localPath: string; fileName: string }>) {
  return {
    username: 'alice', roomName: 'alice', roomId: 'room-alice', url: '/room/room-alice',
    lastMessageTime: turn, lastMessageSnippet: text, isFromUs: false, unread: true,
    messages: [
      { eventId: `out-${turn}`, sender: 'me', text: 'hello', timestamp: turn * 2, isSelf: true },
      { eventId: `in-${turn}`, sender: 'alice', text, timestamp: turn * 2 + 1, isSelf: false, media },
    ],
  };
}

describe('conversation automation', () => {
  it('sends once per inbound turn and flags human handoff after the third send', async () => {
    const { service, chat, getSaved } = harness();

    expect((await service.processConversation(incoming(1)))?.remainingTurns).toBe(2);
    expect((await service.processConversation(incoming(2)))?.remainingTurns).toBe(1);
    const third = await service.processConversation(incoming(3));

    expect(third).toMatchObject({ kind: 'human-required', remainingTurns: 0 });
    expect(chat.sendChatMessage).toHaveBeenCalledTimes(3);
    expect(getSaved()?.automation).toMatchObject({ turnsUsed: 3, status: 'human-required' });
    expect(getSaved()?.automation.aiMessageFingerprints).toHaveLength(3);
    expect(await service.processConversation(incoming(3))).toBeNull();
  });

  it('stops without sending when the user declines images', async () => {
    const { service, chat, getSaved } = harness();
    const result = await service.processConversation(incoming(1, "No thanks, I don't send photos."));

    expect(result?.kind).toBe('boundary');
    expect(chat.sendChatMessage).not.toHaveBeenCalled();
    expect(getSaved()?.automation.status).toBe('boundary');
  });

  it('flags a potential upsell for human handoff without generating a reply', async () => {
    const { service, chat, ai, getSaved } = harness(['onlyfans'], ['fansly.com']);
    const result = await service.processConversation(incoming(1, 'My Fansly is https://www.fansly.com/example'));

    expect(result).toMatchObject({ kind: 'human-required', remainingTurns: 0 });
    expect(ai.generateMediaAsk).not.toHaveBeenCalled();
    expect(chat.sendChatMessage).not.toHaveBeenCalled();
    expect(getSaved()?.automation).toMatchObject({
      status: 'human-required',
      handoffReason: 'Potential upsell detected (domain: fansly.com).',
    });
  });

  it('completes when an inbound image is received', async () => {
    const { service, chat, getSaved } = harness();
    const result = await service.processConversation(incoming(1, '[Image]', [{
      originalUrl: 'mxc://image', localPath: 'image.jpg', fileName: 'image.jpg',
    }]));

    expect(result?.kind).toBe('image-received');
    expect(chat.sendChatMessage).not.toHaveBeenCalled();
    expect(getSaved()?.automation.status).toBe('image-received');
  });

  it('does not generate or send after a human has overridden the thread', async () => {
    const { service, chat, ai, states } = harness();
    const conversation = incoming(1);
    await service.processConversation(conversation);
    const state = states.save.mock.calls.at(-1)?.[1] as ConversationState;
    state.automation.status = 'user-overridden';
    states.save('room-alice', state);

    const result = await service.processConversation(incoming(2));

    expect(result).toBeNull();
    expect(chat.sendChatMessage).toHaveBeenCalledTimes(1);
    expect(ai.generateMediaAsk).toHaveBeenCalledTimes(1);
  });

  it('does not reply when the room has no recorded opener', async () => {
    const { service, chat, ai, claims } = harness([], [], null);

    expect(await service.processConversation(incoming(1))).toBeNull();
    expect(ai.generateMediaAsk).not.toHaveBeenCalled();
    expect(chat.sendChatMessage).not.toHaveBeenCalled();
    expect(claims.tryClaim).not.toHaveBeenCalled();
  });

  it('does not reply to an inbound event older than the recorded opener', async () => {
    const { service, chat, ai, claims } = harness([], [], 4);

    expect(await service.processConversation(incoming(1))).toBeNull();
    expect(ai.generateMediaAsk).not.toHaveBeenCalled();
    expect(chat.sendChatMessage).not.toHaveBeenCalled();
    expect(claims.tryClaim).not.toHaveBeenCalled();
  });

  it('claims an inbound event durably before sending and marks it sent afterwards', async () => {
    const { service, chat, claims } = harness();

    await service.processConversation(incoming(1));

    expect(claims.tryClaim).toHaveBeenCalledWith('room-alice', 'in-1');
    expect(claims.tryClaim.mock.invocationCallOrder[0])
      .toBeLessThan(chat.sendChatMessage.mock.invocationCallOrder[0]);
    expect(claims.markSent).toHaveBeenCalledWith('room-alice', 'in-1');
  });

  it('does not send when another worker already claimed the inbound event', async () => {
    const { service, chat, claims } = harness();
    claims.tryClaim.mockReturnValue(false);

    expect(await service.processConversation(incoming(1))).toBeNull();
    expect(chat.sendChatMessage).not.toHaveBeenCalled();
  });

  it('uses autonomous general replies and the configured turn limit for an r4r subreddit', async () => {
    const { service, ai, chat, getSaved } = harness([], [], 0, { mode: 'r4r', maxAutomatedTurns: 2 });

    expect((await service.processConversation(incoming(1)))?.kind).toBe('sent');
    const result = await service.processConversation(incoming(2));

    expect(result).toMatchObject({ kind: 'human-required', remainingTurns: 0 });
    expect(ai.generateReply).toHaveBeenCalledTimes(2);
    expect(ai.generateMediaAsk).not.toHaveBeenCalled();
    expect(chat.sendChatMessage).toHaveBeenCalledTimes(2);
    expect(getSaved()?.automation).toMatchObject({
      policyMode: 'r4r', policyVersion: 1, maxAutomatedTurns: 2, turnsUsed: 2,
    });
    expect(getSaved()?.askedForMedia).toBe(false);
  });

  it('snapshots the r4r policy so later configuration changes do not switch an active conversation', async () => {
    const behaviour: { mode: 'legacy' | 'r4r' | 'manual'; maxAutomatedTurns: number } = {
      mode: 'r4r', maxAutomatedTurns: 2,
    };
    const { service, ai, getSaved } = harness([], [], 0, behaviour);
    await service.processConversation(incoming(1));
    behaviour.mode = 'manual';

    await service.processConversation(incoming(2));

    expect(ai.generateReply).toHaveBeenCalledTimes(2);
    expect(getSaved()?.automation.policyMode).toBe('r4r');
  });

  it('marks manual conversations for human handling once without generating or sending', async () => {
    const { service, ai, chat, getSaved } = harness([], [], 0, { mode: 'manual', maxAutomatedTurns: 3 });

    const result = await service.processConversation(incoming(1));

    expect(result?.kind).toBe('human-required');
    expect(getSaved()?.automation).toMatchObject({ policyMode: 'manual', status: 'human-required' });
    expect(ai.generateReply).not.toHaveBeenCalled();
    expect(ai.generateMediaAsk).not.toHaveBeenCalled();
    expect(chat.sendChatMessage).not.toHaveBeenCalled();
    expect(await service.processConversation(incoming(1))).toBeNull();
  });

  it('hands r4r conversations to a human when age or contact safety gates trigger', async () => {
    const underage = harness([], [], 0, { mode: 'r4r', maxAutomatedTurns: 5 });
    const result = await underage.service.processConversation(incoming(1, "I'm 17, what about you?"));

    expect(result?.kind).toBe('human-required');
    expect(underage.getSaved()?.automation.handoffReason).toBe('The participant may be under 18.');
    expect(underage.chat.sendChatMessage).not.toHaveBeenCalled();
  });

  it('does not send an r4r generation that asks for media', async () => {
    const fixture = harness([], [], 0, { mode: 'r4r', maxAutomatedTurns: 5 });
    fixture.ai.generateReply.mockResolvedValue('Would you send me a nude?');

    const result = await fixture.service.processConversation(incoming(1));

    expect(result?.kind).toBe('human-required');
    expect(fixture.chat.sendChatMessage).not.toHaveBeenCalled();
    expect(fixture.getSaved()?.automation.handoffReason).toContain('failed autonomous safety checks');
  });
});