import { describe, it, expect, vi, beforeEach } from 'vitest';
import { OpenAiCompatibleClient } from '../../../../src/nest/llm-parse/clients/openai-compatible.client';
import { AnthropicClient } from '../../../../src/nest/llm-parse/clients/anthropic.client';
import type { LlmExtractionInput } from '../../../../src/nest/llm-parse/llm-provider.interface';

const baseInput: LlmExtractionInput = {
  prompt: 'system',
  jsonSchema: { type: 'object' },
  model: 'm',
  text: 'Flight AB123',
};

function mockFetch(impl: (url: string, init: RequestInit) => Promise<Response> | Response) {
  const fn = vi.fn(impl as any);
  vi.stubGlobal('fetch', fn);
  return fn;
}

function jsonResponse(body: unknown, ok = true, status = 200): Response {
  return { ok, status, json: async () => body, text: async () => JSON.stringify(body) } as unknown as Response;
}

beforeEach(() => vi.unstubAllGlobals());

describe('OpenAiCompatibleClient', () => {
  it('posts to {baseUrl}/chat/completions and returns the reservations array', async () => {
    const fetchFn = mockFetch(() =>
      jsonResponse({ choices: [{ message: { content: JSON.stringify({ reservations: [{ '@type': 'FlightReservation' }] }) } }] }),
    );
    const out = await new OpenAiCompatibleClient().extract({ ...baseInput, baseUrl: 'http://localhost:11434/v1/' });
    expect(out).toEqual([{ '@type': 'FlightReservation' }]);
    expect(fetchFn.mock.calls[0][0]).toBe('http://localhost:11434/v1/chat/completions');
  });

  it('tolerates code-fenced JSON', async () => {
    mockFetch(() =>
      jsonResponse({ choices: [{ message: { content: '```json\n{"reservations":[{"@type":"TrainReservation"}]}\n```' } }] }),
    );
    const out = await new OpenAiCompatibleClient().extract(baseInput);
    expect(out).toEqual([{ '@type': 'TrainReservation' }]);
  });

  it('returns [] on malformed content', async () => {
    mockFetch(() => jsonResponse({ choices: [{ message: { content: 'not json' } }] }));
    expect(await new OpenAiCompatibleClient().extract(baseInput)).toEqual([]);
  });

  it('throws on non-2xx', async () => {
    mockFetch(() => jsonResponse({ error: 'bad' }, false, 401));
    await expect(new OpenAiCompatibleClient().extract(baseInput)).rejects.toThrow(/401/);
  });

  it('sends an image natively as image_url but never a file/pdf part', async () => {
    const fetchFn = mockFetch(() => jsonResponse({ choices: [{ message: { content: '{"reservations":[]}' } }] }));
    await new OpenAiCompatibleClient().extract({ ...baseInput, file: { mimeType: 'image/png', data: Buffer.from('IMG') } });
    let parts = JSON.parse((fetchFn.mock.calls[0][1] as RequestInit).body as string).messages[1].content;
    expect(parts.some((p: any) => p.type === 'image_url')).toBe(true);
    expect(parts.some((p: any) => p.type === 'file')).toBe(false);

    // A PDF must NOT be sent as a content part (Ollama rejects it).
    await new OpenAiCompatibleClient().extract({ ...baseInput, file: { mimeType: 'application/pdf', data: Buffer.from('PDF') } });
    parts = JSON.parse((fetchFn.mock.calls[1][1] as RequestInit).body as string).messages[1].content;
    expect(parts.every((p: any) => p.type !== 'file' && p.type !== 'image_url')).toBe(true);
  });
});

describe('OpenAiCompatibleClient — NuExtract path', () => {
  it('inlines the template in one user message (no system, no response_format) and maps the flat result', async () => {
    const fetchFn = mockFetch(() =>
      jsonResponse({
        choices: [
          {
            message: {
              content: JSON.stringify({
                reservations: [
                  { type: 'hotel', name: 'B&B Hotel', booking_reference: '733', checkin_time: '2026-05-01T15:00:00', checkout_time: '2026-05-02T12:00:00' },
                ],
              }),
            },
          },
        ],
      }),
    );
    const out = await new OpenAiCompatibleClient().extract({ ...baseInput, model: 'hf.co/numind/NuExtract-2.0-2B-GGUF:latest', text: 'Hotel doc' });

    expect(out).toEqual([
      {
        '@type': 'LodgingReservation',
        reservationNumber: '733',
        reservationFor: { name: 'B&B Hotel' },
        checkinTime: '2026-05-01T15:00:00',
        checkoutTime: '2026-05-02T12:00:00',
      },
    ]);

    const body = JSON.parse((fetchFn.mock.calls[0][1] as RequestInit).body as string);
    expect(body.messages).toHaveLength(1);
    expect(body.messages[0].role).toBe('user');
    expect(body.messages[0].content[0].text.startsWith('# Template:')).toBe(true);
    expect(body.messages[0].content[0].text.endsWith('Hotel doc')).toBe(true);
    expect(body.temperature).toBe(0);
    expect(body.response_format).toBeUndefined();
  });

  it('keeps the system prompt and response_format for non-NuExtract models', async () => {
    const fetchFn = mockFetch(() => jsonResponse({ choices: [{ message: { content: '{"reservations":[]}' } }] }));
    await new OpenAiCompatibleClient().extract({ ...baseInput, model: 'qwen2.5:7b' });
    const body = JSON.parse((fetchFn.mock.calls[0][1] as RequestInit).body as string);
    expect(body.messages[0].role).toBe('system');
    expect(body.response_format).toBeDefined();
  });
});

describe('AnthropicClient', () => {
  it('forces the emit_reservations tool and reads its input', async () => {
    const fetchFn = mockFetch(() =>
      jsonResponse({ stop_reason: 'tool_use', content: [{ type: 'tool_use', name: 'emit_reservations', input: { reservations: [{ '@type': 'LodgingReservation' }] } }] }),
    );
    const out = await new AnthropicClient().extract(baseInput);
    expect(out).toEqual([{ '@type': 'LodgingReservation' }]);
    const body = JSON.parse((fetchFn.mock.calls[0][1] as RequestInit).body as string);
    expect(body.tool_choice).toEqual({ type: 'tool', name: 'emit_reservations' });
    expect(body.tools[0].name).toBe('emit_reservations');
  });

  it('throws on a refusal stop_reason', async () => {
    mockFetch(() => jsonResponse({ stop_reason: 'refusal', content: [] }));
    await expect(new AnthropicClient().extract(baseInput)).rejects.toThrow(/declined/i);
  });

  it('throws on non-2xx', async () => {
    mockFetch(() => jsonResponse({ error: 'bad' }, false, 500));
    await expect(new AnthropicClient().extract(baseInput)).rejects.toThrow(/500/);
  });

  it('sends a native pdf as a base64 document block', async () => {
    const fetchFn = mockFetch(() => jsonResponse({ content: [{ type: 'tool_use', name: 'emit_reservations', input: { reservations: [] } }] }));
    await new AnthropicClient().extract({ ...baseInput, file: { mimeType: 'application/pdf', data: Buffer.from('PDF') } });
    const body = JSON.parse((fetchFn.mock.calls[0][1] as RequestInit).body as string);
    const blocks = body.messages[0].content;
    expect(blocks.some((b: any) => b.type === 'document' && b.source.type === 'base64')).toBe(true);
  });
});