// 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.
//
// New API: reorderParticipants is async, takes ctx last, writes encounter +
// log internally, returns newEnc. A blocked move (cross-init / same id /
// cross-pointer) returns the SAME enc ref (no write). Missing id rejects.

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

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 upward inserts before target (1-list model, pre-combat)', async () => {
    const { ctx } = mockCtx();
    const ps = [p('a', 10), p('b', 20), p('c', 20)]; // b,c tie
    let e = enc(ps); // pre-combat, no pointer
    const newEnc = await reorderParticipants(e, 'c', 'b', ctx);
    // drag c upward onto b: insert before b → [a,c,b]
    expect(newEnc.participants.map(p => p.id)).toEqual(['a', 'c', 'b']);
  });

  test('drag downward inserts after target (1-list model, pre-combat)', async () => {
    const { ctx } = mockCtx();
    const ps = [p('a', 20), p('b', 20), p('c', 10)]; // a,b tie
    let e = enc(ps); // pre-combat, no pointer
    const newEnc = await reorderParticipants(e, 'a', 'b', ctx);
    // drag a downward onto b: insert after b → [b,a,c]
    expect(newEnc.participants.map(p => p.id)).toEqual(['b', 'a', 'c']);
  });

  test('cross-init drag blocked (no-op)', async () => {
    const { storage, ctx } = mockCtx();
    const ps = [p('a', 10), p('b', 20)];
    let e = enc(ps);
    e = await startEncounter(e, ctx); // [b,a]
    const before = storage.calls.filter(c => c.fn === 'updateDoc').length;
    const newEnc = await reorderParticipants(e, 'a', 'b', ctx);
    expect(newEnc).toBe(e); // same ref = no write
    expect(storage.calls.filter(c => c.fn === 'updateDoc')).toHaveLength(before); // no new write
  });

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

  test('paused combat allows reorder across current-turn pointer', async () => {
    const { ctx } = mockCtx();
    const ps = [p('a', 20), p('b', 20), p('c', 20), p('d', 20)];
    let e = await startEncounter(enc(ps), ctx); // current=a
    e = { ...e, isPaused: true };

    const newEnc = await reorderParticipants(e, 'd', 'a', ctx);

    expect(newEnc).not.toBe(e);
    expect(newEnc.participants.map(p => p.id)).toEqual(['d', 'a', 'b', 'c']);
    expect(newEnc.turnOrderIds).toEqual(['d', 'a', 'b', 'c']);
  });

  test('syncs turnOrderIds = participants order (1-list, fixes BUG-6)', async () => {
    const { ctx } = mockCtx();
    const ps = [p('a', 10), p('b', 20), p('c', 20)];
    let e = enc(ps);
    e = await startEncounter(e, ctx); // started, but reorder pre-pointer advance
    // startEncounter sets current=b (idx0). reorder c before b crosses pointer.
    // Use pre-combat to test syncTurnOrder.
    let pre = enc(ps);
    pre = await reorderParticipants(pre, 'c', 'b', ctx);
    expect(pre.turnOrderIds).toEqual(['a','c','b']);
    expect(pre.turnOrderIds).toEqual(pre.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 (pre-combat)', async () => {
    const { ctx } = mockCtx();
    const ps = [p('a', 10), p('b', 20), p('c', 20)];
    let e = enc(ps); // pre-combat, no pointer
    e = await reorderParticipants(e, 'c', 'b', ctx);
    expect(e.turnOrderIds).toEqual(['a', 'c', 'b']);
  });
});
