// Characterization for reorderParticipants correct usage.
// replay-combat.js calls it with wrong signature (swallowed by try/catch),
// so real behavior untested. Lock what it actually does.

const shared = require('@ttrpg/shared');
const { makeParticipant, startEncounter, nextTurn, reorderParticipants } = shared;

function p(id, init, extra = {}) {
  return makeParticipant({
    id, name: id, type: 'monster',
    initiative: init, maxHp: 100, currentHp: 100,
    ...extra,
  });
}
function enc(ps) {
  return { name:'t', participants:ps, isStarted:false, isPaused:false,
    round:0, currentTurnParticipantId:null, turnOrderIds:[] };
}

describe('reorderParticipants', () => {
  test('drag before target (1-list model)', () => {
    const ps = [p('a', 10), p('b', 20), p('c', 20)]; // b,c tie
    let e = enc(ps);
    e = { ...e, ...startEncounter(e).patch };
    // initial order: b,c,a (init 20,20,10)
    expect(e.turnOrderIds).toEqual(['b', 'c', 'a']);
    const r = reorderParticipants(e, 'c', 'b');
    // drag c before b: remove c → [b,a], insert before b → [c,b,a]
    expect(r.patch.participants.map(p => p.id)).toEqual(['c', 'b', 'a']);
  });

  test('cross-init drag allowed (1-list, DM override)', () => {
    const ps = [p('a', 10), p('b', 20)];
    let e = enc(ps);
    e = { ...e, ...startEncounter(e).patch }; // [b,a]
    const r = reorderParticipants(e, 'a', 'b');
    expect(r.patch.participants.map(p => p.id)).toEqual(['a', 'b']);
  });

  test('throws if id not found', () => {
    const ps = [p('a', 10), p('b', 20)];
    let e = enc(ps);
    e = { ...e, ...startEncounter(e).patch };
    expect(() => reorderParticipants(e, 'a', 'zzz')).toThrow();
  });

  test('syncs turnOrderIds = participants order (1-list, fixes BUG-6)', () => {
    const ps = [p('a', 10), p('b', 20), p('c', 20)];
    let e = enc(ps);
    e = { ...e, ...startEncounter(e).patch };
    const r = reorderParticipants(e, 'c', 'b');
    expect(r.patch.turnOrderIds).toEqual(['c', 'b', 'a']);
    expect(r.patch.turnOrderIds).toEqual(r.patch.participants.map(p => p.id));
  });

  // BUG-6 candidate: reorder should affect turnOrderIds so mid-combat
  // drag-drop changes who goes next within same-initiative tie.
  // Currently RED (turnOrderIds not in patch).
  test('reorder updates turnOrderIds to reflect new participant order', () => {
    const ps = [p('a', 10), p('b', 20), p('c', 20)];
    let e = enc(ps);
    e = { ...e, ...startEncounter(e).patch };
    // order: b,c,a
    e = { ...e, ...reorderParticipants(e, 'c', 'b').patch };
    expect(e.turnOrderIds).toEqual(['c', 'b', 'a']);
  });
});