import { TestBed } from '@angular/core/testing';
import { describe, it, expect } from 'vitest';
import { Result, ok } from '@shared/kernel/fp';
import { BLOB_PRESENTER, BlobPresenter } from '@shared/application/blob-presenter';
import { StamRow, StamTable, toJson } from '@beheer/domain/stamdata';
import { StamdataAdapter } from '@beheer/infrastructure/stamdata.adapter';
import { StamdataStore } from './stamdata.store';

const table: StamTable = {
  id: 'professions',
  label: 'Opleiding → beroep',
  temporal: false,
  columns: [
    { name: 'program', type: 'text', isKey: true, options: [] },
    { name: 'beroep', type: 'text', isKey: false, options: [] },
  ],
};
const rows: StamRow[] = [{ program: 'geneeskunde', beroep: 'Arts' }];

/** A recording fake of BLOB_PRESENTER — records every call instead of touching the DOM,
    which is what TE-006's seam is for: the store's success path becomes assertable. */
function fakeBlobPresenter() {
  const opened: Blob[] = [];
  const downloaded: { blob: Blob; filename: string }[] = [];
  const presenter: BlobPresenter = {
    open: (blob) => opened.push(blob),
    download: (blob, filename) => downloaded.push({ blob, filename }),
  };
  return { presenter, opened, downloaded };
}

function setup(blobPresenter?: BlobPresenter): StamdataStore {
  const adapter: Partial<StamdataAdapter> = {
    list: (): Promise<Result<string, StamTable[]>> => Promise.resolve(ok([table])),
    load: (): Promise<Result<string, { table: StamTable; rows: StamRow[] }>> =>
      Promise.resolve(ok({ table, rows: rows.map((r) => ({ ...r })) })),
  };
  TestBed.configureTestingModule({
    providers: [
      { provide: StamdataAdapter, useValue: adapter },
      ...(blobPresenter ? [{ provide: BLOB_PRESENTER, useValue: blobPresenter }] : []),
    ],
  });
  return TestBed.inject(StamdataStore);
}

describe('StamdataStore undo/redo (WP-32)', () => {
  it('records a cell edit, undoes and redoes it', async () => {
    const store = setup();
    await store.load();
    expect(store.canUndo()).toBe(false);

    store.editCell(0, 'beroep', 'Chirurg');
    expect(store.rows()[0]['beroep']).toBe('Chirurg');
    expect(store.canUndo()).toBe(true);

    store.undo();
    expect(store.rows()[0]['beroep']).toBe('Arts');
    expect(store.canRedo()).toBe(true);

    store.redo();
    expect(store.rows()[0]['beroep']).toBe('Chirurg');
    expect(store.canRedo()).toBe(false);
  });

  it('records addRow and undoes it', async () => {
    const store = setup();
    await store.load();
    store.addRow();
    expect(store.rows().length).toBe(2);
    store.undo();
    expect(store.rows().length).toBe(1);
  });

  it('clears history when switching table', async () => {
    const store = setup();
    await store.load();
    store.addRow();
    expect(store.canUndo()).toBe(true);
    await store.selectTable('professions');
    expect(store.canUndo()).toBe(false);
  });
});

// --- RB-28 (TE-006): download() ends in BLOB_PRESENTER.download, not raw DOM calls,
// so the seam makes both the guard's branches and the success path assertable. ---

describe('StamdataStore.download (RB-28)', () => {
  it('does not call the presenter while the two-clause guard blocks (nothing dirty yet)', async () => {
    // Given a freshly loaded table with no edits — canDownload() is false.
    const { presenter, downloaded } = fakeBlobPresenter();
    const store = setup(presenter);
    await store.load();
    expect(store.canDownload()).toBe(false);

    // When download() is called...
    store.download();

    // Then the guard's true branch fires and the presenter is never reached.
    expect(downloaded).toHaveLength(0);
  });

  it('does not call the presenter while previewing a date, even with edits', async () => {
    // Given a loaded table with a real edit, but a preview date filter active.
    const { presenter, downloaded } = fakeBlobPresenter();
    const store = setup(presenter);
    await store.load();
    store.editCell(0, 'beroep', 'Chirurg');
    store.setPreviewDate('2024-01-01');
    expect(store.canDownload()).toBe(false);

    // When download() is called...
    store.download();

    // Then the guard still blocks it.
    expect(downloaded).toHaveLength(0);
  });

  it("passes toJson(...)'s exact output and the table id as the filename (success path)", async () => {
    // Given a loaded table with a valid, dirty edit — canDownload() is true.
    const { presenter, downloaded } = fakeBlobPresenter();
    const store = setup(presenter);
    await store.load();
    store.editCell(0, 'beroep', 'Chirurg');
    expect(store.canDownload()).toBe(true);
    const expectedJson = toJson(store.table()!, store.rows());

    // When download() is called...
    store.download();

    // Then the presenter receives exactly one call, with toJson's output reaching the
    // file byte-for-byte and the table id as the file name.
    expect(downloaded).toHaveLength(1);
    expect(downloaded[0].filename).toBe('professions.json');
    await expect(downloaded[0].blob.text()).resolves.toBe(expectedJson);
  });
});