import { describe, it, expect, vi } from 'vitest';
import { PhotoUploadStore } from '../../src/lib/client/photo-upload.svelte';

const validRecipe = {
  id: null,
  title: 'T',
  description: 'D',
  source_url: null,
  source_domain: null,
  image_path: null,
  servings_default: null,
  servings_unit: null,
  prep_time_min: null,
  cook_time_min: null,
  total_time_min: null,
  cuisine: null,
  category: null,
  ingredients: [],
  steps: [{ position: 1, text: 'S' }],
  tags: []
};

function fakeFetch(responses: Response[]): typeof fetch {
  let i = 0;
  return vi.fn(async () => responses[i++]) as unknown as typeof fetch;
}

function mkFile(): File {
  return new File([new Uint8Array([1, 2, 3])], 'x.jpg', { type: 'image/jpeg' });
}

describe('PhotoUploadStore', () => {
  it('starts in idle', () => {
    const s = new PhotoUploadStore();
    expect(s.status).toBe('idle');
  });

  it('transitions loading → success on happy path', async () => {
    const s = new PhotoUploadStore({
      fetchImpl: fakeFetch([
        new Response(JSON.stringify({ recipe: validRecipe }), { status: 200 })
      ])
    });
    await s.upload(mkFile());
    expect(s.status).toBe('success');
    expect(s.recipe?.title).toBe('T');
  });

  it('transitions to error with code on 422', async () => {
    const s = new PhotoUploadStore({
      fetchImpl: fakeFetch([
        new Response(
          JSON.stringify({ code: 'NO_RECIPE_IN_IMAGE', message: 'nope' }),
          { status: 422 }
        )
      ])
    });
    await s.upload(mkFile());
    expect(s.status).toBe('error');
    expect(s.errorCode).toBe('NO_RECIPE_IN_IMAGE');
  });

  it('reset() brings store back to idle', async () => {
    const s = new PhotoUploadStore({
      fetchImpl: fakeFetch([new Response('{"code":"X"}', { status: 503 })])
    });
    await s.upload(mkFile());
    expect(s.status).toBe('error');
    s.reset();
    expect(s.status).toBe('idle');
    expect(s.errorCode).toBeNull();
    expect(s.lastFile).toBeNull();
  });

  it('retry re-uploads lastFile', async () => {
    const s = new PhotoUploadStore({
      fetchImpl: fakeFetch([
        new Response('{"code":"X"}', { status: 503 }),
        new Response(JSON.stringify({ recipe: validRecipe }), { status: 200 })
      ])
    });
    await s.upload(mkFile());
    expect(s.status).toBe('error');
    await s.retry();
    expect(s.status).toBe('success');
  });
});