import type { RuntimeEnvService } from '../../../../src/nest/app-config/runtime-env.service';
import { LlmContextOverflowError } from '../../../../src/nest/llm-parse/clients/context-overflow';
import type { LlmConfigResolver } from '../../../../src/nest/llm-parse/llm-config.resolver';
import type { LlmLocalService } from '../../../../src/nest/llm-parse/llm-local.service';
import { LlmParseService } from '../../../../src/nest/llm-parse/llm-parse.service';

import { describe, it, expect, vi, beforeEach } from 'vitest';

// LlmConfigResolver is constructor-injected — a stub instance instead of the
// old path mock (same behaviors as before the DI move).
const resolveLlmConfig = vi.fn();

const { createLlmClient, extract } = vi.hoisted(() => {
  const extract = vi.fn();
  return { createLlmClient: vi.fn(() => ({ extract })), extract };
});
vi.mock('../../../../src/nest/llm-parse/llm-client.factory', () => ({ createLlmClient }));

const { extractEnforced } = vi.hoisted(() => ({ extractEnforced: vi.fn() }));

const { renderPdfPages } = vi.hoisted(() => ({ renderPdfPages: vi.fn() }));
vi.mock('../../../../src/nest/llm-parse/image-input', async (orig) => {
  const actual = (await orig()) as Record<string, unknown>;
  return { ...actual, renderPdfPages };
});
vi.mock('../../../../src/nest/llm-parse/router/ollama-format.client', async (orig) => {
  const actual = (await orig()) as Record<string, unknown>;
  return { ...actual, extractEnforced };
});

const { extractText } = vi.hoisted(() => ({ extractText: vi.fn(async () => 'Flight AB123') }));
vi.mock('../../../../src/nest/llm-parse/text-extract', async (orig) => {
  const actual = (await orig()) as Record<string, unknown>;
  return { ...actual, extractText };
});

const { routeExtraction, routeImageExtraction, detectFlightNumbers } = vi.hoisted(() => ({
  routeExtraction: vi.fn(),
  routeImageExtraction: vi.fn(),
  detectFlightNumbers: vi.fn(() => [] as string[]),
}));
// The router's pure helpers stay real: the currency fallback reads the document's
// total through extractTotalPrice.
vi.mock('../../../../src/nest/llm-parse/router/extraction-router', async (orig) => {
  const actual = (await orig()) as Record<string, unknown>;
  return { ...actual, routeExtraction, routeImageExtraction, detectFlightNumbers };
});

const cfg = (over: Record<string, unknown> = {}) => ({ provider: 'openai', model: 'm', vision: 'off', ...over });
const llmConfigStub = { resolve: resolveLlmConfig } as unknown as LlmConfigResolver;
const modelCapabilities = vi.fn();
const svc = () =>
  new LlmParseService(
    llmConfigStub,
    { isManaged: () => false } as unknown as RuntimeEnvService,
    { modelCapabilities } as unknown as LlmLocalService,
  );
const file = (name: string, body = 'Flight AB123') => ({ buffer: Buffer.from(body), originalName: name });

/** The first bytes of a PNG that claims the given size: enough for the pixel cap to refuse it. */
function pngClaiming(w: number, h: number): Buffer {
  const out = Buffer.alloc(33);
  Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]).copy(out, 0);
  out.writeUInt32BE(13, 8);
  out.write('IHDR', 12, 'latin1');
  out.writeUInt32BE(w, 16);
  out.writeUInt32BE(h, 20);
  return out;
}

beforeEach(() => {
  vi.clearAllMocks();
  resolveLlmConfig.mockReturnValue(cfg());
  extract.mockResolvedValue([{ '@type': 'FlightReservation' }]);
  extractText.mockResolvedValue('Flight AB123');
  detectFlightNumbers.mockReturnValue([]);
  routeExtraction.mockResolvedValue({ kiItems: [{ '@type': 'LodgingReservation' }], warnings: [] });
  routeImageExtraction.mockResolvedValue({ kiItems: [{ '@type': 'TrainReservation' }], warnings: [] });
  modelCapabilities.mockResolvedValue(null);
  renderPdfPages.mockResolvedValue([]);
});

describe('LlmParseService', () => {
  it('isAvailable reflects whether a config resolves', async () => {
    resolveLlmConfig.mockReturnValueOnce(null);
    expect(await svc().isAvailable(1)).toBe(false);
    expect(await svc().isAvailable(1)).toBe(true);
  });

  it('returns a not-configured warning when no config resolves', async () => {
    resolveLlmConfig.mockReturnValue(null);
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toEqual([]);
    expect(res.warnings[0]).toMatch(/not configured/i);
    expect(extract).not.toHaveBeenCalled();
  });

  it('sends extracted text for a text-like file', async () => {
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toEqual([{ '@type': 'FlightReservation' }]);
    const input = extract.mock.calls[0][0];
    expect(input.text).toBe('Flight AB123');
    expect(input.file).toBeUndefined();
  });

  it('extracts text for a pdf on the OpenAI-compatible/local path (no native bytes)', async () => {
    extractText.mockResolvedValue('Hotel X');
    await svc().parse(file('a.pdf', '%PDF'), 1);
    const input = extract.mock.calls[0][0];
    expect(input.text).toBe('Hotel X');
    expect(input.file).toBeUndefined();
  });

  it('sends a pdf as native bytes only for Anthropic', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'anthropic' }));
    await svc().parse(file('a.pdf', '%PDF'), 1);
    const input = extract.mock.calls[0][0];
    expect(input.file).toEqual({ mimeType: 'application/pdf', data: expect.any(Buffer) });
    expect(input.text).toBeUndefined();
    // Read only to check a repeated booking total against (#2651); the model never sees it.
    expect(extractText).toHaveBeenCalledTimes(1);
  });

  it('warns when a pdf yields no readable text (e.g. a scan)', async () => {
    extractText.mockResolvedValue('   ');
    const res = await svc().parse(file('a.pdf', '%PDF'), 1);
    expect(res.kiItems).toEqual([]);
    expect(res.warnings[0]).toMatch(/no readable text/i);
    expect(extract).not.toHaveBeenCalled();
  });

  it('folds flattened type fields into reservationFor (small-model output)', async () => {
    extract.mockResolvedValue([
      {
        '@type': 'FlightReservation',
        reservationNumber: 'ABC',
        flightNumber: 'EZY1357',
        airline: { iataCode: 'EG' },
        departureAirport: { iataCode: 'GEG' },
        arrivalAirport: { iataCode: 'AMS' },
        departureTime: '2026-06-11T10:00:00',
      },
    ]);
    const res = await svc().parse(file('a.txt'), 1);
    const item = res.kiItems[0] as any;
    expect(item.reservationNumber).toBe('ABC');
    expect(item.reservationFor).toMatchObject({ flightNumber: 'EZY1357', departureAirport: { iataCode: 'GEG' } });
    // root-level keys are not duplicated into reservationFor
    expect(item.reservationFor.reservationNumber).toBeUndefined();
  });

  it('leaves already-nested reservationFor untouched', async () => {
    extract.mockResolvedValue([{ '@type': 'FlightReservation', reservationFor: { flightNumber: 'X1' } }]);
    const res = await svc().parse(file('a.txt'), 1);
    expect((res.kiItems[0] as any).reservationFor).toEqual({ flightNumber: 'X1' });
  });

  it('drops nodes without a string @type and warns', async () => {
    extract.mockResolvedValue([{ '@type': 'FlightReservation' }, { foo: 'bar' }]);
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toEqual([{ '@type': 'FlightReservation' }]);
    expect(res.warnings.some((w) => /unrecognized/i.test(w))).toBe(true);
  });

  it('degrades to a warning when the client throws', async () => {
    extract.mockRejectedValue(new Error('boom'));
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toEqual([]);
    expect(res.warnings[0]).toMatch(/AI parsing failed/i);
  });

  it('logs the swallowed client error to console.error', async () => {
    const spy = vi.spyOn(console, 'error').mockImplementation(() => {});
    extract.mockRejectedValue(new Error('boom'));
    await svc().parse(file('a.txt'), 1);
    expect(spy).toHaveBeenCalledWith(expect.stringContaining('[llm-parse]'), 'boom');
    spy.mockRestore();
  });

  it('routes the local provider through the extraction router instead of the single-shot client', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local', baseUrl: 'http://ollama:11434/v1', apiKey: 'k' }));
    extractText.mockResolvedValue('Hotel booking');
    routeExtraction.mockResolvedValue({ kiItems: [{ '@type': 'LodgingReservation' }], warnings: ['note'] });
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toEqual([{ '@type': 'LodgingReservation' }]);
    expect(res.warnings).toEqual(['note']);
    expect(extract).not.toHaveBeenCalled();
    expect(routeExtraction).toHaveBeenCalledWith('Hotel booking', {
      baseUrl: 'http://ollama:11434/v1',
      model: 'm',
      apiKey: 'k',
    });
  });

  it('keeps the wide text cap (16k) for a local flight itinerary but tightens it (6k) otherwise', async () => {
    const long = 'x'.repeat(7000);
    extractText.mockResolvedValue(long);

    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local' }));
    detectFlightNumbers.mockReturnValue(['AB123']);
    await svc().parse(file('flights.txt'), 1);
    expect(routeExtraction.mock.calls[0][0]).toHaveLength(7000); // under the 16k cap, untouched

    vi.clearAllMocks();
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local' }));
    extractText.mockResolvedValue(long);
    detectFlightNumbers.mockReturnValue([]);
    routeExtraction.mockResolvedValue({ kiItems: [], warnings: [] });
    const res = await svc().parse(file('hotel.txt'), 1);
    // single booking → tighter cap, keeping the start and the end
    const sent = routeExtraction.mock.calls[0][0] as string;
    expect(sent).toBe(`${'x'.repeat(4500)}
[... 1000 characters omitted ...]
${'x'.repeat(1500)}`);
    expect(res.warnings).toEqual(['hotel.txt: long document, the middle part was not read']);
  });

  it('degrades to a warning when the local router throws', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local' }));
    routeExtraction.mockRejectedValue(new Error('ollama down'));
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toEqual([]);
    expect(res.warnings[0]).toMatch(/AI parsing failed/i);
  });

  it('logs the swallowed router error to console.error', async () => {
    const spy = vi.spyOn(console, 'error').mockImplementation(() => {});
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local' }));
    routeExtraction.mockRejectedValue(new Error('ollama down'));
    await svc().parse(file('a.txt'), 1);
    expect(spy).toHaveBeenCalledWith(expect.stringContaining('[llm-parse]'), 'ollama down');
    spy.mockRestore();
  });

  it('warns when the file cannot be read (text extraction throws)', async () => {
    extractText.mockRejectedValue(new Error('corrupt pdf'));
    const res = await svc().parse(file('a.pdf', '%PDF'), 1);
    expect(res.kiItems).toEqual([]);
    expect(res.warnings[0]).toMatch(/could not read file/i);
    expect(res.warnings[0]).toContain('corrupt pdf');
  });
});

/**
 * What a schema-bound provider answered for one Booking.com stay (#2477): the
 * same node twice, and a currency the model made up. Synthetic values in the
 * reporter's shape.
 */
describe('LlmParseService: cleaning up an AI answer (#2477)', () => {
  const stay = (over: Record<string, unknown> = {}) => ({
    '@type': 'LodgingReservation',
    checkinTime: '2026-09-06T13:00:00',
    checkoutTime: '2026-09-07T11:00:00',
    price: 89.35,
    priceCurrency: 'EURials',
    reservationFor: { name: 'Harbour View Inn', address: 'Example Road 1' },
    ...over,
  });
  const PRINT = ['Harbour View Inn', 'PREIS', '1 Zimmer € 74,46', 'Preis', '(für 2 Gäste)', '€ 89,35'].join('\n');

  it('collapses exact duplicate nodes from one AI answer', async () => {
    extractText.mockResolvedValue(PRINT);
    extract.mockResolvedValue([stay(), stay()]);
    const res = await svc().parse(file('Bestätigung_1.pdf', '%PDF'), 1);
    expect(res.kiItems).toHaveLength(1);
    expect(res.warnings).toEqual([]);
  });

  it("collapses the reporter's two nodes without a venue into one as well", async () => {
    extractText.mockResolvedValue(PRINT);
    const bare = {
      '@type': 'LodgingReservation',
      checkinTime: '2026-09-06T13:00:00',
      checkoutTime: '2026-09-07T11:00:00',
      price: 89.35,
      priceCurrency: 'EURials',
    };
    extract.mockResolvedValue([bare, { ...bare }]);
    const res = await svc().parse(file('Bestätigung_1.pdf', '%PDF'), 1);
    expect(res.kiItems).toEqual([{ ...bare, priceCurrency: 'EUR' }]);
  });

  it('treats the same fields in another key order as the same node', async () => {
    const a = stay();
    const b = {
      reservationFor: { address: 'Example Road 1', name: 'Harbour View Inn' },
      priceCurrency: 'EURials',
      price: 89.35,
      checkoutTime: a.checkoutTime,
      checkinTime: a.checkinTime,
      '@type': a['@type'],
    };
    extract.mockResolvedValue([a, b]);
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toHaveLength(1);
  });

  it('keeps distinct nodes that only look alike', async () => {
    extract.mockResolvedValue([
      stay(),
      stay({ checkinTime: '2026-09-07T13:00:00', checkoutTime: '2026-09-08T11:00:00' }),
    ]);
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toHaveLength(2);
  });

  it('turns a garbled priceCurrency into the code it starts with', async () => {
    extract.mockResolvedValue([stay()]);
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems[0].priceCurrency).toBe('EUR');
  });

  it("falls back to the document's currency symbol when the model named no currency", async () => {
    extractText.mockResolvedValue(PRINT);
    extract.mockResolvedValue([
      stay({ priceCurrency: 'ZZZ' }),
      stay({ priceCurrency: undefined, checkinTime: '2026-10-01T15:00:00' }),
    ]);
    const res = await svc().parse(file('b.pdf', '%PDF'), 1);
    expect(res.kiItems.map((n) => n.priceCurrency)).toEqual(['EUR', 'EUR']);
  });

  it('drops the currency when neither the model nor the document names one', async () => {
    extractText.mockResolvedValue('Harbour View Inn, 89.35 total');
    extract.mockResolvedValue([stay({ priceCurrency: 'ZZZ' })]);
    const res = await svc().parse(file('b.txt'), 1);
    expect(res.kiItems[0]).not.toHaveProperty('priceCurrency');
    expect(res.kiItems[0].price).toBe(89.35);
  });

  it('asks the document only when the node has a price', async () => {
    extractText.mockResolvedValue(PRINT);
    extract.mockResolvedValue([stay({ price: undefined, priceCurrency: 'Pesos' })]);
    const res = await svc().parse(file('b.pdf', '%PDF'), 1);
    expect(res.kiItems[0]).not.toHaveProperty('priceCurrency');
  });

  it('has no document to ask on the native PDF path', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'anthropic' }));
    extract.mockResolvedValue([stay({ priceCurrency: 'ZZZ' })]);
    const res = await svc().parse(file('b.pdf', '%PDF'), 1);
    // The text read for the total check is not a document the currency is asked from.
    expect(extract.mock.calls[0][0].text).toBeUndefined();
    expect(res.kiItems[0]).not.toHaveProperty('priceCurrency');
  });

  it('leaves a node without price and currency as it came', async () => {
    const plain = { '@type': 'FlightReservation', reservationFor: { flightNumber: 'X1' } };
    extract.mockResolvedValue([plain]);
    const res = await svc().parse(file('a.txt'), 1);
    expect(res.kiItems).toEqual([plain]);
  });
});

describe('LlmParseService: a photo', () => {
  it('readsImages follows on and off whatever the provider, and never asks a server for them', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local', vision: 'on' }));
    await expect(svc().readsImages(1)).resolves.toBe(true);
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local', vision: 'off' }));
    await expect(svc().readsImages(1)).resolves.toBe(false);
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'openai', vision: 'on' }));
    await expect(svc().readsImages(1)).resolves.toBe(true);
    expect(modelCapabilities).not.toHaveBeenCalled();
  });

  it('readsImages on auto asks a local server, and answers no for a cloud provider', async () => {
    resolveLlmConfig.mockReturnValue(
      cfg({
        provider: 'local',
        vision: 'auto',
        baseUrl: 'http://ollama:11434/v1',
        model: 'qwen3.5:4b',
        apiKey: 'proxy-key',
      }),
    );
    modelCapabilities.mockResolvedValue(['completion', 'vision']);
    await expect(svc().readsImages(1)).resolves.toBe(true);
    // With the key the extraction sends, so an Ollama behind an auth proxy answers.
    expect(modelCapabilities).toHaveBeenCalledWith('http://ollama:11434/v1', 'qwen3.5:4b', 'proxy-key');
    modelCapabilities.mockResolvedValue(['completion']);
    await expect(svc().readsImages(1)).resolves.toBe(false);
    modelCapabilities.mockResolvedValue(null);
    await expect(svc().readsImages(1)).resolves.toBe(false);

    modelCapabilities.mockClear();
    for (const provider of ['openai', 'anthropic']) {
      resolveLlmConfig.mockReturnValue(cfg({ provider, vision: 'auto' }));
      await expect(svc().readsImages(1)).resolves.toBe(false);
    }
    expect(modelCapabilities).not.toHaveBeenCalled();
  });

  it('readsImages is false when AI parsing is not configured', async () => {
    resolveLlmConfig.mockReturnValue(null);
    await expect(svc().readsImages(1)).resolves.toBe(false);
  });

  it('refuses a photo the model cannot read, without calling it', async () => {
    const res = await svc().parse(file('ticket.jpg', 'jpeg'), 1);
    expect(res.kiItems).toEqual([]);
    expect(res.warnings[0]).toMatch(/does not read images/);
    expect(extract).not.toHaveBeenCalled();
    expect(extractText).not.toHaveBeenCalled();
  });

  it('sends a photo as an image to a cloud provider, with no text', async () => {
    for (const provider of ['openai', 'anthropic']) {
      extract.mockClear();
      resolveLlmConfig.mockReturnValue(cfg({ provider, vision: 'on' }));
      await svc().parse(file('ticket.PNG', 'not really a png'), 1);
      const input = extract.mock.calls[0][0];
      // Bytes that do not decode go as they came rather than being refused.
      expect(input.file).toEqual({ mimeType: 'image/png', data: Buffer.from('not really a png') });
      expect(input.text).toBeUndefined();
    }
    expect(extractText).not.toHaveBeenCalled();
  });

  it('sends a photo through the local router with the image attached', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local', vision: 'on', baseUrl: 'http://ollama:11434/v1' }));
    const res = await svc().parse(file('ticket.jpeg', 'jpeg bytes'), 1);
    expect(res.kiItems).toEqual([{ '@type': 'TrainReservation' }]);
    expect(routeImageExtraction).toHaveBeenCalledWith(
      [Buffer.from('jpeg bytes')],
      expect.objectContaining({ baseUrl: 'http://ollama:11434/v1' }),
    );
    expect(routeExtraction).not.toHaveBeenCalled();
    expect(extract).not.toHaveBeenCalled();
  });

  it('turns a photo too large to decode into a warning, not a throw', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'on' }));
    const res = await svc().parse({ buffer: pngClaiming(20000, 20000), originalName: 'ticket.png' }, 1);
    expect(res.kiItems).toEqual([]);
    expect(res.warnings[0]).toMatch(/^ticket\.png: could not read file .*20000 x 20000 pixels/);
    expect(extract).not.toHaveBeenCalled();
  });

  it('leaves a PDF on its text path when the model reads images', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'on' }));
    await svc().parse(file('a.pdf', '%PDF'), 1);
    expect(extract.mock.calls[0][0].file).toBeUndefined();
    expect(extractText).toHaveBeenCalled();
  });
});

describe('LlmParseService.readReceipt', () => {
  const RECEIPT = {
    merchant: 'Bäckerei',
    date: '2026-09-20',
    total: 7.5,
    currency: 'EUR',
    items: [{ name: 'Brezel', price: 2.5 }],
  };

  it('says why when AI parsing is not set up, the file is not a photo, or the model reads no images', async () => {
    resolveLlmConfig.mockReturnValue(null);
    expect((await svc().readReceipt(file('r.jpg'), 1)).warnings[0]).toMatch(/not configured/);
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'on' }));
    expect(await svc().readReceipt(file('r.pdf'), 1)).toEqual({ receipt: null, warnings: ['r.pdf: not a photo'] });
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'off' }));
    expect((await svc().readReceipt(file('r.jpg'), 1)).warnings[0]).toMatch(/does not read images/);
    expect(extract).not.toHaveBeenCalled();
    expect(extractEnforced).not.toHaveBeenCalled();
  });

  it("reads through Ollama's native chat on a local provider, with the photo and the receipt schema", async () => {
    resolveLlmConfig.mockReturnValue(
      cfg({ provider: 'local', vision: 'on', baseUrl: 'http://ollama:11434/v1', model: 'qwen3.5:4b' }),
    );
    extractEnforced.mockResolvedValue(RECEIPT);
    await expect(svc().readReceipt(file('r.jpg', 'jpeg'), 1)).resolves.toEqual({ receipt: RECEIPT, warnings: [] });
    const call = extractEnforced.mock.calls[0][0];
    expect(call).toMatchObject({
      baseUrl: 'http://ollama:11434/v1',
      model: 'qwen3.5:4b',
      images: [Buffer.from('jpeg').toString('base64')],
    });
    expect(call.schema.required).toContain('total');
    // The grammar holds Ollama to one flat receipt, and the prompt says the same.
    expect(call.system).toContain('Return ONLY a JSON object of the form { "merchant"');
    expect(extract).not.toHaveBeenCalled();
  });

  it('asks a cloud client for a receipts list with the photo attached, and keeps the first', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'anthropic', vision: 'on' }));
    extract.mockResolvedValue([RECEIPT, { total: 1 }]);
    await expect(svc().readReceipt(file('r.png', 'png'), 1)).resolves.toEqual({ receipt: RECEIPT, warnings: [] });
    const input = extract.mock.calls[0][0];
    expect(input.rootKey).toBe('receipts');
    expect(input.file).toEqual({ mimeType: 'image/png', data: Buffer.from('png') });
    expect(input.text).toBeUndefined();
    expect(input.prompt).toContain('Return ONLY a JSON object of the form { "receipts": [');
  });

  it('refuses a photo too large to decode with a warning, before asking the model', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'on' }));
    const res = await svc().readReceipt({ buffer: pngClaiming(20000, 20000), originalName: 'r.png' }, 1);
    expect(res).toEqual({
      receipt: null,
      warnings: ['r.png: the photo is 20000 x 20000 pixels, more than the 40 megapixels TREK reads'],
    });
    expect(extract).not.toHaveBeenCalled();
  });

  it('answers a warning, not a throw, when the model fails or reads nothing', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'on' }));
    extract.mockRejectedValue(new Error('429'));
    const failed = await svc().readReceipt(file('r.jpg'), 1);
    expect(failed.receipt).toBeNull();
    expect(failed.warnings[0]).toMatch(/AI parsing failed — 429/);
    extract.mockResolvedValue([]);
    expect(await svc().readReceipt(file('r.jpg'), 1)).toEqual({
      receipt: null,
      warnings: ['r.jpg: no receipt could be read'],
    });
  });
});

describe('LlmParseService: a scanned PDF', () => {
  const page = (n: string) => ({ mimeType: 'image/jpeg', data: Buffer.from(n) });

  beforeEach(() => extractText.mockResolvedValue('   '));

  it('sends the pages as images when the text layer is empty and the model reads images', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'on' }));
    renderPdfPages.mockResolvedValue([page('p1'), page('p2')]);
    await svc().parse(file('scan.pdf', '%PDF'), 1);
    const input = extract.mock.calls[0][0];
    expect(input.file).toEqual(page('p1'));
    expect(input.pageImages).toEqual([page('p2')]);
    expect(input.text).toBeUndefined();
  });

  it('hands the local router every page', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local', vision: 'on' }));
    renderPdfPages.mockResolvedValue([page('p1'), page('p2')]);
    await svc().parse(file('scan.pdf', '%PDF'), 1);
    expect(routeImageExtraction).toHaveBeenCalledWith([Buffer.from('p1'), Buffer.from('p2')], expect.anything());
    expect(routeExtraction).not.toHaveBeenCalled();
  });

  it('keeps the warning, and draws nothing, when the model reads no images', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'off' }));
    const res = await svc().parse(file('scan.pdf', '%PDF'), 1);
    expect(res.warnings[0]).toMatch(/no readable text found \(a scanned PDF needs a model that reads images\)/);
    expect(renderPdfPages).not.toHaveBeenCalled();
    expect(extract).not.toHaveBeenCalled();
  });

  it('keeps the warning when no page could be drawn', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'on' }));
    const res = await svc().parse(file('scan.pdf', '%PDF'), 1);
    expect(res.warnings[0]).toMatch(/no readable text found/);
    expect(extract).not.toHaveBeenCalled();
  });

  it('does not draw an empty text file', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ vision: 'on' }));
    await svc().parse(file('empty.txt', ''), 1);
    expect(renderPdfPages).not.toHaveBeenCalled();
  });
});

/**
 * A long confirmation keeps its total near the end (#2652): two Example Airways
 * legs up top, then itinerary and footer text, then the payment block. Synthetic.
 */
describe('LlmParseService: a long document', () => {
  const legs = [
    'Example Airways booking confirmation',
    'Booking reference: EX4Y2Z',
    'EX 101  Lisbon (LIS) to Porto (OPO)  2026-11-03 08:10 - 09:05',
    'EX 102  Porto (OPO) to Lisbon (LIS)  2026-11-07 19:40 - 20:35',
  ].join('\n');
  const filler = (chars: number) =>
    'Baggage, check-in and fare conditions apply as published. '.repeat(Math.ceil(chars / 58)).slice(0, chars);
  const confirmation = (fillerChars: number) =>
    `${legs}\n${filler(fillerChars)}\nPayment summary\nTotal paid: USD 200.00\nThank you for flying with us.`;

  it('sends an early total and leaves a short document untouched, without a warning', async () => {
    const doc = `${legs}\nTotal paid: USD 200.00\n${filler(1500)}`;
    extractText.mockResolvedValue(doc);
    const res = await svc().parse(file('confirmation.txt'), 1);
    expect(extract.mock.calls[0][0].text).toBe(doc);
    expect(res.warnings).toEqual([]);
  });

  it('sends a total that sits past the first 4,000 characters to a cloud model', async () => {
    const doc = confirmation(6000);
    expect(doc.indexOf('Total paid')).toBeGreaterThan(4000);
    extractText.mockResolvedValue(doc);
    const res = await svc().parse(file('confirmation.txt'), 1);
    const sent = extract.mock.calls[0][0].text as string;
    expect(sent).toBe(doc);
    expect(sent).toContain('Total paid: USD 200.00');
    expect(res.warnings).toEqual([]);
  });

  it('keeps the start and the end of a document longer than the window, and says so', async () => {
    const doc = confirmation(60_000);
    extractText.mockResolvedValue(doc);
    const res = await svc().parse(file('confirmation.txt'), 1);
    const sent = extract.mock.calls[0][0].text as string;
    expect(sent.length).toBeLessThan(doc.length);
    expect(sent.startsWith(legs)).toBe(true);
    expect(sent).toContain('Total paid: USD 200.00');
    expect(sent.endsWith('Thank you for flying with us.')).toBe(true);
    expect(sent).toMatch(/\[\.\.\. \d+ characters omitted \.\.\.\]/);
    expect(res.warnings).toEqual(['confirmation.txt: long document, the middle part was not read']);
  });

  it('keeps the start and the end for a local model too, inside its own window', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'local' }));
    routeExtraction.mockResolvedValue({ kiItems: [{ '@type': 'FlightReservation' }], warnings: ['note'] });
    const doc = confirmation(9000);
    extractText.mockResolvedValue(doc);
    const res = await svc().parse(file('confirmation.txt'), 1);
    const sent = routeExtraction.mock.calls[0][0] as string;
    expect(sent.startsWith(legs)).toBe(true);
    expect(sent).toContain('Total paid: USD 200.00');
    expect(sent).toMatch(/\[\.\.\. \d+ characters omitted \.\.\.\]/);
    expect(res.warnings).toEqual(['confirmation.txt: long document, the middle part was not read', 'note']);
  });
});

/** Too long for a small self-hosted server, and a total shared by two flights (#2651, #2652). */
describe('LlmParseService: a server that runs out of context, and a shared booking total', () => {
  const legs =
    'Example Airways\nBooking reference: DEMO77\nEX100 LIS-OPO 2031-02-05 12:00\nEX101 OPO-LIS 2031-02-08 07:00';
  const doc = `${legs}\n${'Fare conditions apply.\n'.repeat(1500)}Payment summary\nTotal paid: USD 200.00\n`;
  const flight = (n: string, dep: string) => ({
    '@type': 'FlightReservation',
    reservationNumber: 'DEMO77',
    price: 200,
    priceCurrency: 'USD',
    reservationFor: { '@type': 'Flight', flightNumber: n, departureTime: dep },
  });

  it('asks once more with the compact window when the server says the prompt does not fit', async () => {
    extractText.mockResolvedValue(doc);
    extract
      .mockRejectedValueOnce(
        new LlmContextOverflowError("LLM request failed (400): This model's maximum context length is 8192 tokens"),
      )
      .mockResolvedValueOnce([{ '@type': 'FlightReservation' }]);
    const res = await svc().parse(file('confirmation.txt'), 1);
    expect(extract).toHaveBeenCalledTimes(2);
    const second = extract.mock.calls[1][0].text as string;
    expect(second.length).toBeLessThan(8_100);
    expect(second.startsWith(legs)).toBe(true);
    expect(second).toContain('Total paid: USD 200.00');
    expect(res.kiItems).toHaveLength(1);
    expect(res.warnings).toEqual(['confirmation.txt: long document, the middle part was not read']);
  });

  it('does not retry a PDF read natively, which has no text window to shorten', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'anthropic' }));
    extractText.mockResolvedValue(doc);
    extract.mockRejectedValueOnce(new LlmContextOverflowError('Anthropic request failed (400): prompt is too long'));
    const res = await svc().parse(file('ticket.pdf', '%PDF'), 1);
    expect(extract).toHaveBeenCalledTimes(1);
    expect(res.warnings).toHaveLength(1);
    expect(res.warnings[0]).toMatch(/AI parsing failed/);
  });

  it('does not retry any other failure', async () => {
    extractText.mockResolvedValue(doc);
    extract.mockRejectedValueOnce(new Error('LLM request failed (401): bad key'));
    const res = await svc().parse(file('confirmation.txt'), 1);
    expect(extract).toHaveBeenCalledTimes(1);
    expect(res.warnings[0]).toMatch(/AI parsing failed/);
  });

  it('keeps a total both flights repeat on the first to depart only', async () => {
    extractText.mockResolvedValue(doc);
    extract.mockResolvedValue([flight('EX101', '2031-02-08T07:00:00'), flight('EX100', '2031-02-05T12:00:00')]);
    const res = await svc().parse(file('confirmation.txt'), 1);
    const [late, early] = res.kiItems as unknown as Record<string, unknown>[];
    expect(early).toMatchObject({ price: 200, priceCurrency: 'USD' });
    expect(late).not.toHaveProperty('price');
    expect(late).not.toHaveProperty('priceCurrency');
  });

  it('checks a native PDF against its text too, without sending that text', async () => {
    resolveLlmConfig.mockReturnValue(cfg({ provider: 'anthropic' }));
    extractText.mockResolvedValue(doc);
    extract.mockResolvedValue([flight('EX100', '2031-02-05T12:00:00'), flight('EX101', '2031-02-08T07:00:00')]);
    const res = await svc().parse(file('ticket.pdf', '%PDF'), 1);
    expect(extract.mock.calls[0][0].text).toBeUndefined();
    const [first, second] = res.kiItems as unknown as Record<string, unknown>[];
    expect(first).toHaveProperty('price', 200);
    expect(second).not.toHaveProperty('price');
  });
});