// Tests fuer Sync-Queue
// Phase 4.3

import { describe, it, expect, beforeEach } from 'vitest';

// Mock localStorage vor dem Import (das Modul nutzt es zur Initialisierung)
const store = new Map<string, string>();
(globalThis as any).localStorage = {
  getItem: (key: string) => store.get(key) ?? null,
  setItem: (key: string, value: string) => { store.set(key, value); },
  removeItem: (key: string) => { store.delete(key); },
  clear: () => { store.clear(); },
  key: (i: number) => Array.from(store.keys())[i] ?? null,
  get length() { return store.size; },
};

import {
  enqueueSync,
  dequeueSync,
  loadQueue,
  clearQueue,
  saveQueue,
} from '../webapp/src/sync-queue';

describe('Sync-Queue', () => {
  beforeEach(() => {
    clearQueue();
  });

  it('Startzustand: leere Queue', () => {
    expect(loadQueue()).toEqual([]);
  });

  it('enqueue fuegt Element hinzu', () => {
    enqueueSync('note1.md', '# Inhalt 1');
    const queue = loadQueue();
    expect(queue.length).toBe(1);
    expect(queue[0].noteId).toBe('note1.md');
    expect(queue[0].content).toBe('# Inhalt 1');
    expect(typeof queue[0].timestamp).toBe('number');
  });

  it('enqueue fuegt mehrere Elemente hinzu (FIFO)', () => {
    enqueueSync('a.md', 'A');
    enqueueSync('b.md', 'B');
    enqueueSync('c.md', 'C');
    const queue = loadQueue();
    expect(queue.length).toBe(3);
    expect(queue.map((q) => q.noteId)).toEqual(['a.md', 'b.md', 'c.md']);
  });

  it('dequeue entfernt Element nach noteId', () => {
    enqueueSync('a.md', 'A');
    enqueueSync('b.md', 'B');
    dequeueSync('a.md');
    const queue = loadQueue();
    expect(queue.length).toBe(1);
    expect(queue[0].noteId).toBe('b.md');
  });

  it('dequeue unbekannter noteId ist no-op', () => {
    enqueueSync('a.md', 'A');
    dequeueSync('nicht-da.md');
    expect(loadQueue().length).toBe(1);
  });

  it('clearQueue leert komplett', () => {
    enqueueSync('a.md', 'A');
    enqueueSync('b.md', 'B');
    clearQueue();
    expect(loadQueue()).toEqual([]);
  });

  it('saveQueue/loadQueue roundtrip mit localStorage', () => {
    const queue = [
      { noteId: 'a.md', content: 'A', timestamp: 1000 },
      { noteId: 'b.md', content: 'B', timestamp: 2000 },
    ];
    saveQueue(queue);
    const loaded = loadQueue();
    expect(loaded).toEqual(queue);
  });

  it('kaputtes JSON in localStorage wird als leere Queue behandelt', () => {
    store.set('mindomat-pending-syncs', '{invalid json');
    expect(loadQueue()).toEqual([]);
  });
});