import { createHash } from 'node:crypto';
import { describe, expect, it, vi } from 'vitest';
import { Doc0UploadClient, Doc0UploadOutcomeUnknownError, Doc0InspectionUnavailableError, prepareDoc0UploadIdentity } from '../../src/document-workbench/doc0-upload-client';

const bytes = new TextEncoder().encode('source bytes');
const input = {
  tenantId: 'tenant-a',
  projectId: 'project-a',
  actorId: 'user-a',
  requestId: 'req-a',
  idempotencyKey: 'idem-a',
  filename: 'test.txt',
  mimeType: 'text/plain',
  classification: 'confidential' as const,
  bytes,
};
const receipt = {
  document: { documentId: 'doc-a', tenantId: 'tenant-a', projectId: 'project-a', currentVersionId: 'v1' },
  currentVersion: {
    versionId: 'v1',
    tenantId: 'tenant-a',
    documentId: 'doc-a',
    checksumSha256: createHash('sha256').update(bytes).digest('hex'),
    sizeBytes: bytes.length,
    pipelineStage: 'parsed',
  },
};

describe('DOC0 upload client', () => {
  it('validates the receipt against the original scope even if the caller mutates its input during dispatch', async () => {
    const mutable = { ...input, bytes: new Uint8Array(input.bytes) };
    const fetchImpl = async () => {
      mutable.tenantId = 'tenant-b';
      mutable.projectId = 'project-b';
      return Response.json({ ...receipt,
        document: { ...receipt.document, tenantId: 'tenant-b', projectId: 'project-b' },
        currentVersion: { ...receipt.currentVersion, tenantId: 'tenant-b' },
      }, { status: 201 });
    };
    const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl });
    await expect(client.upload(mutable)).rejects.toBeInstanceOf(Doc0UploadOutcomeUnknownError);
  });
  it('accepts a matching receipt for the bytes and scope actually dispatched', async () => {
    const mutable = { ...input, bytes: new Uint8Array(input.bytes) };
    const fetchImpl = async (_url: string | URL | Request, init?: RequestInit) => {
      mutable.tenantId = 'tenant-b';
      mutable.bytes.fill(0);
      const sentFile = (init?.body as FormData).get('file') as Blob;
      expect(await sentFile.text()).toBe('source bytes');
      return Response.json(receipt, { status: 201 });
    };
    const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl });
    await expect(client.upload(mutable)).resolves.toMatchObject({ documentId: 'doc-a' });
  });
  it('pins validated client configuration rather than trusting later mutations', async () => {
    const fetchImpl = vi.fn(async (_url: string | URL | Request, init?: RequestInit) => {
      expect(new Headers(init?.headers).get('authorization')).toBe('Bearer test');
      return Response.json(receipt, { status: 201 });
    });
    const config = { baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, timeoutMs: 1000, fetchImpl };
    const client = new Doc0UploadClient(config);
    config.serviceToken = 'changed';
    config.maxBytes = 1;
    config.timeoutMs = 0;
    await expect(client.upload(input)).resolves.toMatchObject({ documentId: 'doc-a' });
  });
  it('sends real bytes and validates a tenant-scoped checksum-bound receipt', async () => {
    const fetchImpl = vi.fn(async (_url: string | URL | Request, init?: RequestInit) => {
      expect(new Headers(init?.headers).get('x-tenant-id')).toBe('tenant-a');
      expect(new Headers(init?.headers).get('x-idempotency-key')).toBe('idem-a');
      expect(init?.redirect).toBe('error');
      const form = init?.body as FormData;
      expect(await (form.get('file') as Blob).text()).toBe('source bytes');
      return new Response(JSON.stringify(receipt), { status: 201 });
    });
    const client = new Doc0UploadClient({
      baseUrl: 'https://doc0.test',
      serviceToken: 'test',
      maxBytes: 100,
      fetchImpl: fetchImpl as typeof fetch,
    });
    expect(await client.upload(input)).toMatchObject({
      documentId: 'doc-a',
      versionId: 'v1',
      pipelineStage: 'parsed',
    });
  });
  it.each(['rapport åäö.xlsx', 'folder/name.txt', 'Back\\path.txt', 'A"B.txt', 'row\r\nname.txt'])(
    'uses stable multipart metadata while retaining original name: %s', async (filename) => {
      const fixture = { ...input, filename, mimeType: 'APPLICATION/PDF' };
      const identity = prepareDoc0UploadIdentity(fixture);
      const fetchImpl = vi.fn(async (_url: string | URL | Request, init?: RequestInit) => {
        const form = init?.body as FormData;
        expect(JSON.parse(form.get('input') as string).displayName).toBe(filename);
        expect((form.get('file') as File).name).toBe(identity.wireFilename);
        expect((form.get('file') as File).type).toBe('application/pdf');
        return Response.json(receipt, { status: 201 });
      });
      await new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl }).upload(fixture);
      expect(identity.sourceSha256).toBe(receipt.currentVersion.checksumSha256);
      expect(identity.requestFingerprint).toMatch(/^[0-9a-f]{64}$/);
      expect(fetchImpl).toHaveBeenCalledOnce();
    },
  );
  it('rejects non-canonical identity headers before any upload', async () => {
    const fetchImpl = vi.fn();
    const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl });
    for (const tenantId of [' tenant-a', 'tenant-a ', 'tenant-å', 'tenant-\n']) {
      await expect(client.upload({ ...input, tenantId })).rejects.toThrow(/Invalid/);
    }
    expect(fetchImpl).not.toHaveBeenCalled();
  });
  it('rejects ambiguous MIME values before any upload', async () => {
    const fetchImpl = vi.fn();
    const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl });
    for (const mimeType of ['text/plain; charset=utf-8', 'text/å', ' text/plain', 'not-a-mime']) {
      await expect(client.upload({ ...input, mimeType })).rejects.toThrow(/MIME/);
    }
    expect(fetchImpl).not.toHaveBeenCalled();
  });
  it.each([
    { document: { ...receipt.document, tenantId: 'tenant-b' } },
    { document: { ...receipt.document, projectId: 'other' } },
    { currentVersion: { ...receipt.currentVersion, checksumSha256: 'bad' } },
    { currentVersion: { ...receipt.currentVersion, documentId: 'other' } },
  ])('rejects an incorrect receipt', async (change) => {
    const client = new Doc0UploadClient({
      baseUrl: 'https://doc0.test',
      serviceToken: 'test',
      maxBytes: 100,
      fetchImpl: async () => new Response(JSON.stringify({ ...receipt, ...change }), { status: 201 }),
    });
    await expect(client.upload(input)).rejects.toThrow(/receipt/);
  });
  it('rejects empty or oversized inputs before calling DOC0', async () => {
    const fetchImpl = vi.fn();
    const client = new Doc0UploadClient({
      baseUrl: 'https://doc0.test',
      serviceToken: 'test',
      maxBytes: 2,
      fetchImpl,
    });
    await expect(client.upload(input)).rejects.toThrow(/Invalid/);
    await expect(client.upload({ ...input, bytes: new Uint8Array() })).rejects.toThrow(/Invalid/);
    expect(fetchImpl).not.toHaveBeenCalled();
  });
  it('rejects insecure endpoints, embedded credentials and invalid timeouts', () => {
    const base = { serviceToken: 'test', maxBytes: 100 };
    for (const baseUrl of ['http://doc0.test', 'https://doc0.test?token=x', 'file:///tmp/doc0', 'not a URL']) {
      expect(() => new Doc0UploadClient({ ...base, baseUrl })).toThrow(/HTTPS/);
    }
    const credentialUrl = new URL('https://doc0.test');
    credentialUrl.username = 'fixture';
    credentialUrl.password = 'fixture';
    expect(() => new Doc0UploadClient({ ...base, baseUrl: credentialUrl.toString() })).toThrow(/HTTPS/);
    expect(() => new Doc0UploadClient({ ...base, baseUrl: 'https://doc0.test', timeoutMs: 0 })).toThrow(/limits/);
  });
  it('treats transport failure and non-success responses as unknown outcomes without retrying', async () => {
    for (const response of [new Error('connection reset'), new Response('unavailable', { status: 503 })]) {
      const fetchImpl = vi.fn(async () => { if (response instanceof Error) throw response; return response; });
      const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl });
      await expect(client.upload(input)).rejects.toBeInstanceOf(Doc0UploadOutcomeUnknownError);
      expect(fetchImpl).toHaveBeenCalledOnce();
    }
  });
  it('rejects broken, malformed and oversized receipts as unknown outcomes', async () => {
    const broken = new ReadableStream<Uint8Array>({ start(controller) { controller.error(new Error('broken')); } });
    const locked = new Response('{}');
    const lock = locked.body!.getReader();
    for (const response of [new Response(broken), new Response('{'), new Response('x'.repeat(128 * 1024 + 1)), locked]) {
      const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl: async () => response });
      await expect(client.upload(input)).rejects.toBeInstanceOf(Doc0UploadOutcomeUnknownError);
    }
    lock.releaseLock();
  });
});

describe('DOC0 upload inspection', () => {
  const inspection = { tenantId: 'tenant-a', projectId: 'project-a', actorId: 'actor-a', requestId: 'req-a', idempotencyKey: 'idem-a', sourceSha256: 'a'.repeat(64), sourceSizeBytes: 12, requestFingerprint: 'b'.repeat(64) };
  it('sends only scoped metadata and returns the recorded journal state without retry', async () => {
    const fetchImpl = vi.fn(async (_url: string | URL | Request, init?: RequestInit) => {
      expect(init?.redirect).toBe('error');
      expect(init?.cache).toBe('no-store');
      expect(new Headers(init?.headers).get('x-idempotency-key')).toBe('idem-a');
      expect(JSON.parse(String(init?.body))).toEqual({ projectId: 'project-a', sourceSha256: 'a'.repeat(64), sourceSizeBytes: 12, requestFingerprint: 'b'.repeat(64) });
      return Response.json({ status: 'completed_recorded', documentId: 'doc', versionId: 'v1' });
    });
    const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl });
    expect(await client.inspect(inspection)).toEqual({ status: 'completed_recorded', documentId: 'doc', versionId: 'v1' });
    expect(fetchImpl).toHaveBeenCalledOnce();
  });
  it('preserves weaker states without turning them into successful uploads', async () => {
    for (const status of ['not_found', 'in_progress', 'reconciliation_required'] as const) {
      const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl: async () => Response.json({ status }) });
      expect(await client.inspect(inspection)).toEqual({ status });
    }
  });
  it('fails closed on unknown, malformed, excessive or unavailable responses', async () => {
    const responses = [Response.json({ status: 'completed' }), Response.json({ status: 'completed_recorded', documentId: 'doc' }), Response.json({ status: 'not_found', documentId: 'unexpected' }), new Response('x'.repeat(128 * 1024 + 1)), new Response('unavailable', { status: 503 })];
    for (const response of responses) {
      const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl: async () => response });
      await expect(client.inspect(inspection)).rejects.toBeInstanceOf(Doc0InspectionUnavailableError);
    }
  });
  it('rejects invalid fingerprints before sending a request', async () => {
    const fetchImpl = vi.fn();
    const client = new Doc0UploadClient({ baseUrl: 'https://doc0.test', serviceToken: 'test', maxBytes: 100, fetchImpl });
    await expect(client.inspect({ ...inspection, requestFingerprint: 'bad' })).rejects.toThrow(/Invalid/);
    expect(fetchImpl).not.toHaveBeenCalled();
  });
});