// Unsaved edits of the editors (src/lib/edits.ts): one pending value per field, typing back to the saved value drops
// it, undo / redo (typing into one field within COALESCE_MS is one step), discard can be undone, areas and apps stay
// apart, and the ops sent to project.edit.
import { describe, expect, test } from 'bun:test';
import { COALESCE_MS, EditStore, keyOf } from '../src/lib/edits';

const sub = (value: string) => ({ kind: 'listing' as const, store: 'apple' as const, lang: 'en-US', field: 'subtitle', value });

describe('EditStore', () => {
  test('pending values, back to the saved value drops the edit', () => {
    let now = 0;
    const s = new EditStore(() => now);
    s.set('p1', sub('Tidy'), 'listings', 'Old');
    expect(s.count('p1')).toBe(1);
    expect(s.get('p1', keyOf(sub('')))!.op).toEqual(sub('Tidy'));
    now += 10;
    s.set('p1', sub('Old'), 'listings', 'Old');
    expect(s.count('p1')).toBe(0);
    expect(s.count('p2')).toBe(0);
  });
  test('undo / redo, one step per field burst', () => {
    let now = 0;
    const s = new EditStore(() => now);
    s.set('p', sub('T'), 'listings', 'Old');
    now += 100; s.set('p', sub('Ti'), 'listings', 'Old');
    now += 100; s.set('p', sub('Tid'), 'listings', 'Old');
    now += COALESCE_MS + 1;
    s.set('p', { kind: 'config', path: 'app.supportUrl', value: 'https://example.com/h' }, 'listings', 'https://example.com/s');
    expect(s.count('p')).toBe(2);
    s.undo('p');
    expect(s.count('p')).toBe(1);
    expect((s.get('p', keyOf(sub('')))!.op as { value: string }).value).toBe('Tid');
    s.undo('p');
    expect(s.count('p')).toBe(0);
    expect(s.canUndo('p')).toBe(false);
    s.redo('p');
    s.redo('p');
    expect(s.count('p')).toBe(2);
  });
  test('areas, discard (undoable), clear after a save, ops in a stable order', () => {
    const s = new EditStore(() => 0);
    s.set('p', sub('Tidy'), 'listings', 'Old');
    s.set('p', { kind: 'config', path: 'apple.info.free', value: false }, 'appinfo', true);
    expect(s.count('p', 'listings')).toBe(1);
    expect(s.ops('p', 'appinfo')).toEqual([{ kind: 'config', path: 'apple.info.free', value: false }]);
    expect(s.ops('p').map(keyOf)).toEqual(['config:apple.info.free', 'listing:apple:en-US:subtitle']);
    s.clear('p', 'listings', { undoable: true });
    expect(s.count('p')).toBe(1);
    s.undo('p');
    expect(s.count('p')).toBe(2);
    expect(s.dirtyProjects()).toEqual(['p']);
    s.clear('p');
    expect(s.dirtyProjects()).toEqual([]);
    expect(s.canUndo('p')).toBe(false);
  });
  test('subscribers hear every change', () => {
    const s = new EditStore(() => 0);
    let n = 0;
    const off = s.subscribe(() => { n++; });
    s.set('p', sub('x'), 'listings', '');
    s.undo('p');
    off();
    s.set('p', sub('y'), 'listings', '');
    expect(n).toBe(2);
    expect(s.snapshot()).toBe(3);
  });
});