import { test } from 'node:test';
import assert from 'node:assert/strict';
import { emptySpec } from '../src/spec.js';
import {
  createSession, proposeAssignment, commitAssignment,
  undoLast, moveEntry, removeEntry,
} from '../src/session.js';

const s64 = () => ({ ...emptySpec(), capacityGb: 64, formFactor: 'LRDIMM', rank: '4DRx4', speed: 'PC4-2400', partNumber: 'M386A8K40BM1-CRC4Y' });
const s32 = () => ({ ...emptySpec(), capacityGb: 32, formFactor: 'RDIMM', rank: '2Rx4', speed: 'PC4-2666', partNumber: 'M393A4K40BB1-CTD' });

function scan(session, spec, source = 'barcode') {
  const plan = proposeAssignment(session, spec);
  return commitAssignment(session, spec, source, plan.stackId);
}

test('erster Scan legt Stapel A an', () => {
  const session = createSession();
  const plan = proposeAssignment(session, s64());
  assert.equal(plan.kind, 'new');
  assert.equal(plan.stackId, 'A');
});

test('gleiches Modul landet auf demselben Stapel', () => {
  const session = createSession();
  scan(session, s64());
  const plan = proposeAssignment(session, s64());
  assert.equal(plan.kind, 'match');
  assert.equal(plan.stackId, 'A');
});

test('anderes Modul legt Stapel B an', () => {
  const session = createSession();
  scan(session, s64());
  const plan = proposeAssignment(session, s32());
  assert.equal(plan.kind, 'new');
  assert.equal(plan.stackId, 'B');
});

test('eine Verwechslung erzeugt keinen Fast-Duplikat-Stapel', () => {
  const session = createSession();
  scan(session, s64());
  const verrauscht = { ...s64(), partNumber: 'M386A8K4OBM1-CRC4Y' };
  const plan = proposeAssignment(session, verrauscht);
  assert.equal(plan.kind, 'match');
  assert.equal(plan.stackId, 'A');
});

test('Scan ohne Teilenummer bei zwei passenden Stapeln ist mehrdeutig', () => {
  const session = createSession();
  scan(session, { ...s64(), partNumber: 'M386A8K40BM1-CRC4Y' });
  scan(session, { ...s64(), partNumber: 'HMAA8GL7AMR4N-UH' });
  const ohnePn = { ...s64(), partNumber: null };
  const plan = proposeAssignment(session, ohnePn);
  assert.equal(plan.kind, 'ambiguous');
  assert.deepEqual(plan.candidates, ['A', 'B']);
});

test('commitAssignment zaehlt den Stapel hoch und fuehrt die Liste', () => {
  const session = createSession();
  scan(session, s64());
  scan(session, s64());
  assert.equal(session.stacks.length, 1);
  assert.equal(session.stacks[0].count, 2);
  assert.equal(session.entries.length, 2);
});

test('undoLast nimmt den letzten Eintrag zurueck', () => {
  const session = createSession();
  scan(session, s64());
  scan(session, s64());
  const entfernt = undoLast(session);
  assert.equal(entfernt.stackId, 'A');
  assert.equal(session.stacks[0].count, 1);
  assert.equal(session.entries.length, 1);
});

test('undoLast entfernt einen leer gewordenen Stapel', () => {
  const session = createSession();
  scan(session, s64());
  undoLast(session);
  assert.equal(session.stacks.length, 0);
  assert.equal(undoLast(session), null);
});

test('moveEntry sortiert einen Eintrag um', () => {
  const session = createSession();
  const a = scan(session, s64());
  scan(session, s32());
  moveEntry(session, a.entryId, 'B');
  const stapelA = session.stacks.find((s) => s.id === 'A');
  const stapelB = session.stacks.find((s) => s.id === 'B');
  assert.equal(stapelA, undefined, 'leerer Stapel wird entfernt');
  assert.equal(stapelB.count, 2);
});

test('removeEntry entfernt einen einzelnen Eintrag', () => {
  const session = createSession();
  const a = scan(session, s64());
  scan(session, s64());
  removeEntry(session, a.entryId);
  assert.equal(session.entries.length, 1);
  assert.equal(session.stacks[0].count, 1);
});