import { afterEach, describe, expect, it, vi } from 'vitest';
import { HttpProjectStore } from '../../src/core/store/HttpProjectStore';
import { HttpFileStore } from '../../src/core/store/HttpFileStore';
import { StaleRevisionError } from '../../src/core/store/ProjectStore';
import { makeProject } from '../helpers';

const FILE = `${'a'.repeat(64)}.png`;
/** What nginx answers when it refuses a request body larger than its 1 MB limit. */
const NGINX_413 = '<html><head><title>413 Request Entity Too Large</title></head><body></body></html>';

/** Replaces `fetch` with one that always answers the same way; the mock records the request. */
function stubFetch(body: BodyInit | null, init: ResponseInit) {
  const mock = vi.fn<typeof fetch>(() => Promise.resolve(new Response(body, init)));
  vi.stubGlobal('fetch', mock);
  return mock;
}

afterEach(() => {
  vi.unstubAllGlobals();
});

describe('HttpProjectStore', () => {
  it('reads a JSON body and keeps the server message on failure', async () => {
    stubFetch(JSON.stringify([{ id: 'p', name: 'P', revision: 1, updatedAt: 'now' }]), { status: 200 });
    await expect(new HttpProjectStore('/api').list()).resolves.toHaveLength(1);

    stubFetch(JSON.stringify({ error: 'Project not found' }), { status: 404 });
    await expect(new HttpProjectStore('/api').load('p')).rejects.toThrow(/Project not found \(404\)/);
  });

  it('explains a non-JSON error body by its status instead of calling it invalid JSON', async () => {
    stubFetch(NGINX_413, { status: 413, statusText: 'Request Entity Too Large' });
    const { project } = makeProject();
    await expect(new HttpProjectStore('/api').save(project, 1)).rejects.toThrow(/too large \(413\)/i);
  });

  it('still reports a successful response that is not JSON as a defect', async () => {
    stubFetch('<html>hello</html>', { status: 200 });
    await expect(new HttpProjectStore('/api').list()).rejects.toThrow(/invalid JSON \(200\)/);
  });

  it('turns a 409 into a StaleRevisionError', async () => {
    stubFetch(JSON.stringify({ error: 'Project was modified elsewhere', revision: 7 }), { status: 409 });
    const { project } = makeProject();
    await expect(new HttpProjectStore('/api').save(project, 3)).rejects.toBeInstanceOf(StaleRevisionError);
  });
});

describe('HttpFileStore', () => {
  it('uploads the raw bytes and returns what the server stored', async () => {
    const mock = stubFetch(JSON.stringify({ file: FILE, width: 2, height: 3, bytes: 4 }), { status: 201 });
    const bytes = new Blob([new Uint8Array([1, 2, 3, 4])]);
    const stored = await new HttpFileStore('/api', 'textures').upload(bytes, 'image/png');

    expect(stored).toEqual({ file: FILE, width: 2, height: 3, bytes: 4 });
    const [url, init] = mock.mock.calls[0]!;
    expect(url).toBe('/api?r=textures');
    expect(init?.method).toBe('POST');
    // The body *is* the image: no multipart wrapper, no JSON.
    expect(init?.body).toBe(bytes);
    expect(init?.headers).toEqual({ 'Content-Type': 'image/png' });
  });

  it('sends the file name beside the route, and omits it when there is none', async () => {
    const answer = JSON.stringify({ file: FILE, name: 'hero idle.png', width: 2, height: 3, bytes: 4 });
    const bytes = new Blob([new Uint8Array(4)]);

    let mock = stubFetch(answer, { status: 201 });
    await new HttpFileStore('/api', 'textures').upload(bytes, 'image/png', 'hero idle.png');
    // The body stays the raw image, so the name travels in the query – encoded, not as a path.
    expect(mock.mock.calls[0]![0]).toBe('/api?r=textures&name=hero%20idle.png');

    mock = stubFetch(answer, { status: 201 });
    await new HttpFileStore('/api', 'textures').upload(bytes, 'image/png');
    expect(mock.mock.calls[0]![0]).toBe('/api?r=textures');
  });

  it('reports the nginx size limit as a size problem', async () => {
    stubFetch(NGINX_413, { status: 413, statusText: 'Request Entity Too Large' });
    const bytes = new Blob([new Uint8Array(8)]);
    await expect(new HttpFileStore('/api', 'textures').upload(bytes, 'image/png')).rejects.toThrow(
      /too large \(413\)/i,
    );
  });

  it('lists and deletes', async () => {
    stubFetch(JSON.stringify([{ file: FILE, width: 8, height: 4, bytes: 12, updatedAt: 'now' }]), {
      status: 200,
    });
    await expect(new HttpFileStore('/api', 'textures').list()).resolves.toEqual([
      { file: FILE, width: 8, height: 4, bytes: 12, updatedAt: 'now' },
    ]);

    const mock = stubFetch(null, { status: 204 });
    await new HttpFileStore('/api', 'textures').delete(FILE);
    expect(mock.mock.calls[0]![0]).toBe(`/api?r=${encodeURIComponent(`textures/${FILE}`)}`);
    expect(mock.mock.calls[0]![1]?.method).toBe('DELETE');
  });
});