import { test } from 'node:test';
import assert from 'node:assert/strict';
import { saveSession, loadSession, clearSession } from '../src/storage.js';
import { createSession, commitAssignment } from '../src/session.js';
import { emptySpec } from '../src/spec.js';

function fakeStore() {
  const data = new Map();
  return {
    data,
    getItem: (key) => (data.has(key) ? data.get(key) : null),
    setItem: (key, value) => data.set(key, value),
    removeItem: (key) => data.delete(key),
  };
}

test('leerer Speicher liefert null', () => {
  assert.equal(loadSession(fakeStore()), null);
});

test('Sitzung ueberlebt Sichern und Laden', () => {
  const store = fakeStore();
  const session = createSession();
  commitAssignment(session, { ...emptySpec(), capacityGb: 64 }, 'barcode', 'A');
  saveSession(session, store);

  const wieder = loadSession(store);
  assert.equal(wieder.stacks.length, 1);
  assert.equal(wieder.stacks[0].count, 1);
  assert.equal(wieder.entries[0].spec.capacityGb, 64);
  assert.equal(wieder.nextEntryId, 2);
});

test('clearSession raeumt auf', () => {
  const store = fakeStore();
  saveSession(createSession(), store);
  clearSession(store);
  assert.equal(loadSession(store), null);
});

test('kaputter Inhalt liefert null statt einer Ausnahme', () => {
  const store = fakeStore();
  store.setItem('ram-sortierhilfe:session', '{kein json');
  assert.equal(loadSession(store), null);
});

test('Sichern ohne funktionierenden Speicher wirft nicht', () => {
  const kaputt = {
    getItem: () => null,
    setItem: () => { throw new Error('quota exceeded'); },
    removeItem: () => {},
  };
  assert.doesNotThrow(() => saveSession(createSession(), kaputt));
});