/* ─────────────────────────────────────────────────────────────
   Repertory – frontend app
   Plain JS, no build step, no framework.
───────────────────────────────────────────────────────────── */

// ── State ────────────────────────────────────────────────────
let allTunes      = [];
let allSources    = [];
let allMusicians  = [];
let allInstruments = [];
let allTunings    = [];
let sortCol       = 'name';
let sortDir       = 'asc';

// editing state
let editingTuneId  = null;   // null = add mode
let editingEntryId = null;   // null = no existing instrument entry

// notes modal state
let notesTuneId  = null;
let notesEntryId = null;

let unlocked = false;

// ── DOM refs ─────────────────────────────────────────────────
const $  = id => document.getElementById(id);
const $$ = sel => document.querySelectorAll(sel);

const statusEl         = $('status');
const tbody            = $('tune-tbody');
const emptyMsg         = $('empty-msg');
const tuneModal        = $('tune-modal');
const notesModal       = $('notes-modal');
const tuneForm         = $('tune-form');
const refsList         = $('refs-list');
const btnUnlock        = $('btn-unlock');
const btnAddTune       = $('btn-add-tune');
const sourceInput      = $('source-input');
const sourceDatalist   = $('source-list');
const musicianDatalist = $('musician-list');
const instrumentSelect = $('instrument-select');
const tuningDatalist   = $('tuning-list');
const btnDeleteTune    = $('btn-delete-tune');
const btnEditNotes     = $('btn-edit-notes');

// ── Config ───────────────────────────────────────────────────
const _cfg = window.REPERTORY_CONFIG || {};

function getApiKey() {
  return _cfg.apiKey || sessionStorage.getItem('apiKey') || '';
}

// ── Unlock ───────────────────────────────────────────────────
if (getApiKey()) setUnlocked(true);

btnUnlock.addEventListener('click', () => {
  const key = prompt('API key:');
  if (!key) return;
  sessionStorage.setItem('apiKey', key);
  if (!_cfg.apiUrl) {
    const url = prompt('API URL (e.g. https://your-server:5000):');
    if (url) sessionStorage.setItem('apiUrl', url.replace(/\/$/, ''));
  }
  setUnlocked(true);
});

function setUnlocked(val) {
  unlocked = val;
  btnUnlock.hidden = val;
  btnAddTune.hidden = !val;
  // Show/hide edit column header and edit buttons
  const editHeader = document.querySelector('.edit-col');
  if (editHeader) editHeader.hidden = !val;
  $$('.btn-edit-row').forEach(b => { b.hidden = !val; });
  $$('.note-edit-controls').forEach(el => { el.hidden = !val; });
  $('btn-add-tune-note').hidden = !val;
  $('btn-add-inst-note').hidden = !val;
}

// ── API helpers ───────────────────────────────────────────────
function resolvedApiUrl() {
  return (_cfg.apiUrl || sessionStorage.getItem('apiUrl') || '').replace(/\/$/, '');
}

async function apiFetch(path, options = {}) {
  const url = resolvedApiUrl() + path;
  const headers = { 'Content-Type': 'application/json', ...(options.headers || {}) };
  if (options.method && options.method !== 'GET') {
    headers['X-API-Key'] = getApiKey();
  }
  const res = await fetch(url, { ...options, headers });
  if (!res.ok) {
    const text = await res.text();
    throw new Error(`${res.status} ${res.statusText}: ${text}`);
  }
  return res.json();
}

function setStatus(msg, isError = false) {
  statusEl.textContent = msg;
  statusEl.style.color = isError ? '#eb5757' : '#6fcf97';
}

// ── Load ──────────────────────────────────────────────────────
async function loadAll() {
  setStatus('Loading…');
  try {
    [allTunes, allSources, allMusicians, allInstruments, allTunings] = await Promise.all([
      apiFetch('/tunes/'),
      apiFetch('/sources/'),
      apiFetch('/musicians/'),
      apiFetch('/instruments'),
      apiFetch('/tunings/'),
    ]);
    populateFilterOptions();
    populateDatalist(sourceDatalist,   allSources);
    populateDatalist(musicianDatalist, allMusicians);
    populateDatalist(tuningDatalist,   allTunings);
    populateInstrumentSelect();
    renderTable();
    setStatus(`${allTunes.length} tunes loaded`);
  } catch (e) {
    setStatus(e.message, true);
  }
}

function populateDatalist(datalist, items) {
  datalist.innerHTML = '';
  items.forEach(item => {
    const opt = document.createElement('option');
    opt.value = item.name;
    datalist.appendChild(opt);
  });
}

function populateInstrumentSelect(selectedId = null) {
  instrumentSelect.innerHTML = '<option value="">— none —</option>';
  allInstruments.forEach(inst => {
    const opt = document.createElement('option');
    opt.value = inst.id;
    opt.textContent = inst.name;
    if (selectedId && inst.id === selectedId) opt.selected = true;
    instrumentSelect.appendChild(opt);
  });
}

function populateFilterOptions() {
  // Nothing to populate in DOM — popover dropdowns are built on demand
  // from allSources, allInstruments, allTunings in buildDropdownOptions()
}

// ── Quick-add ─────────────────────────────────────────────────
async function quickAdd(endpoint, promptText, list, datalist, onDone) {
  const name = prompt(promptText);
  if (!name) return null;
  try {
    const item = await apiFetch(endpoint, { method: 'POST', body: JSON.stringify({ name }) });
    list.push(item);
    list.sort((a, b) => a.name.localeCompare(b.name));
    if (datalist) populateDatalist(datalist, list);
    if (onDone) onDone(item);
    return item;
  } catch (e) {
    setStatus(e.message, true);
    return null;
  }
}

$('btn-quick-add-source').addEventListener('click', async () => {
  await quickAdd('/sources/', 'New source name:', allSources, sourceDatalist, item => {
    sourceInput.value = item.name;
    populateFilterOptions();
  });
});

$('btn-quick-add-musician').addEventListener('click', async () => {
  await quickAdd('/musicians/', 'New musician name:', allMusicians, musicianDatalist, item => {
    tuneForm.elements.inst_learned_from.value = item.name;
  });
});

$('btn-quick-add-tuning').addEventListener('click', async () => {
  await quickAdd('/tunings/', 'New tuning name:', allTunings, tuningDatalist, item => {
    tuneForm.elements.inst_tuning.value = item.name;
    populateFilterOptions();
  });
});

// ── Resolve name → id ─────────────────────────────────────────
function resolveSourceId(name) {
  if (!name) return null;
  return allSources.find(x => x.name.toLowerCase() === name.toLowerCase())?.id ?? null;
}

function resolveMusicianId(name) {
  if (!name) return null;
  return allMusicians.find(x => x.name.toLowerCase() === name.toLowerCase())?.id ?? null;
}

function resolveTuningId(name) {
  if (!name) return null;
  return allTunings.find(x => x.name.toLowerCase() === name.toLowerCase())?.id ?? null;
}

// ── Rows: one per instrument entry ────────────────────────────
// For tunes with no instrument entries, emit one row with empty instrument cols
function buildRows(tunes) {
  const rows = [];
  for (const tune of tunes) {
    if (tune.instruments.length === 0) {
      rows.push({ tune, entry: null });
    } else {
      for (const entry of tune.instruments) {
        rows.push({ tune, entry });
      }
    }
  }
  return rows;
}

// ── Filters (popover per column) ─────────────────────────────
const filters = {
  key:        null,
  source:     null,
  modal:      null,
  instrument: null,
  tuning:     null,
  callable:   null,
  review:     null,
  to_learn:   null,
  difficulty: null,
};

const popover      = $('filter-popover');
const popoverInner = $('filter-popover-inner');
let   activeFilterKey = null;

const BOOL_FILTERS     = new Set(['modal', 'callable', 'review', 'to_learn']);
const DROPDOWN_FILTERS = new Set(['source', 'instrument', 'tuning', 'difficulty']);

function openFilterPopover(key, thEl) {
  if (activeFilterKey === key) { closeFilterPopover(); return; }
  activeFilterKey = key;
  popoverInner.innerHTML = '';

  if (BOOL_FILTERS.has(key)) {
    const label = document.createElement('label');
    label.className = 'popover-checkbox-row';
    const cb = document.createElement('input');
    cb.type = 'checkbox';
    if (filters[key] === true)       { cb.checked = true;  cb.indeterminate = false; }
    else if (filters[key] === false) { cb.checked = false; cb.indeterminate = true;  }
    else                             { cb.checked = false; cb.indeterminate = false; }
    const names = { modal: 'Modal', callable: 'Callable', review: 'Needs review', to_learn: 'To learn' };
    label.appendChild(cb);
    label.appendChild(document.createTextNode(names[key] ?? key));
    popoverInner.appendChild(label);
    cb.addEventListener('change', () => {
      if (filters[key] === null)  { filters[key] = true;  cb.checked = true;  cb.indeterminate = false; }
      else if (filters[key] === true)  { filters[key] = false; cb.checked = false; cb.indeterminate = true;  }
      else                             { filters[key] = null;  cb.checked = false; cb.indeterminate = false; }
      updateFilterIndicators(); renderTable();
    });

  } else if (DROPDOWN_FILTERS.has(key)) {
    const sel = document.createElement('select');
    buildDropdownOptions(key).forEach(([val, lbl]) => {
      const opt = document.createElement('option');
      opt.value = val; opt.textContent = lbl;
      if (val === (filters[key] ?? '')) opt.selected = true;
      sel.appendChild(opt);
    });
    popoverInner.appendChild(sel);
    sel.addEventListener('change', () => {
      filters[key] = sel.value || null;
      updateFilterIndicators(); renderTable();
    });

  } else {
    // key — plain text
    const inp = document.createElement('input');
    inp.type = 'text'; inp.placeholder = 'Filter…'; inp.value = filters[key] ?? '';
    popoverInner.appendChild(inp);
    inp.addEventListener('input', () => {
      filters[key] = inp.value || null;
      updateFilterIndicators(); renderTable();
    });
    requestAnimationFrame(() => inp.focus());
  }

  const clr = document.createElement('button');
  clr.className = 'popover-clear'; clr.textContent = 'Clear';
  clr.addEventListener('click', () => {
    filters[key] = null; updateFilterIndicators(); renderTable(); closeFilterPopover();
  });
  popoverInner.appendChild(clr);

  const rect = thEl.getBoundingClientRect();
  popover.hidden = false;
  popover.style.top  = `${rect.bottom + 4}px`;
  popover.style.left = `${Math.min(rect.left, window.innerWidth - 200)}px`;
}

function closeFilterPopover() {
  popover.hidden = true;
  activeFilterKey = null;
}

function buildDropdownOptions(key) {
  const none = [['', '— all —']];
  if (key === 'source')     return [...none, ...allSources.map(s     => [String(s.id), s.name])];
  if (key === 'instrument') return [...none, ...allInstruments.map(i => [String(i.id), i.name])];
  if (key === 'tuning')     return [...none, ...allTunings.map(t     => [String(t.id), t.name])];
  if (key === 'difficulty') return [...none, ['easy', 'Easy'], ['hard', 'Hard']];
  return none;
}

function updateFilterIndicators() {
  $$('th[data-filter]').forEach(th => {
    th.classList.toggle('filter-active', filters[th.dataset.filter] !== null);
  });
  const anyActive = Object.values(filters).some(v => v !== null) || $('filter-search').value;
  $('btn-clear-filters').hidden = !anyActive;
}

$$('th[data-filter]').forEach(th => {
  th.addEventListener('click', e => { e.stopPropagation(); openFilterPopover(th.dataset.filter, th); });
});

document.addEventListener('click', e => {
  if (!popover.hidden && !popover.contains(e.target)) closeFilterPopover();
});
document.addEventListener('keydown', e => { if (e.key === 'Escape') closeFilterPopover(); });

$('filter-search').addEventListener('input', () => { updateFilterIndicators(); renderTable(); });

$('btn-clear-filters').addEventListener('click', () => {
  Object.keys(filters).forEach(k => { filters[k] = null; });
  $('filter-search').value = '';
  updateFilterIndicators(); renderTable(); closeFilterPopover();
});

// ── Match function ────────────────────────────────────────────
function rowMatchesFilters(tune, entry) {
  const search = $('filter-search').value.toLowerCase();
  if (search && !tune.name?.toLowerCase().includes(search)) return false;
  if (filters.key    && tune.key?.toLowerCase() !== filters.key.toLowerCase()) return false;
  if (filters.source && String(tune.source_id) !== filters.source) return false;
  if (filters.modal  !== null && tune.modal !== filters.modal) return false;

  if (filters.instrument && (!entry || String(entry.instrument_id) !== filters.instrument)) return false;
  if (entry) {
    if (filters.tuning     && String(entry.tuning_id) !== filters.tuning) return false;
    if (filters.callable   !== null && entry.callable  !== filters.callable)  return false;
    if (filters.review     !== null && entry.review    !== filters.review)    return false;
    if (filters.to_learn   !== null && entry.to_learn  !== filters.to_learn)  return false;
    if (filters.difficulty && entry.difficulty?.toLowerCase() !== filters.difficulty) return false;
  }
  return true;
}

// ── Sorting ───────────────────────────────────────────────────
function sortTunes(tunes) {
  return [...tunes].sort((a, b) => {
    let av = a[sortCol] ?? '';
    let bv = b[sortCol] ?? '';
    if (typeof av === 'string') av = av.toLowerCase();
    if (typeof bv === 'string') bv = bv.toLowerCase();
    if (av < bv) return sortDir === 'asc' ? -1 : 1;
    if (av > bv) return sortDir === 'asc' ?  1 : -1;
    return 0;
  });
}

$$('#tune-table thead th[data-col]').forEach(th => {
  th.addEventListener('click', () => {
    const col = th.dataset.col;
    sortDir = sortCol === col && sortDir === 'asc' ? 'desc' : 'asc';
    sortCol = col;
    $$('#tune-table thead th').forEach(t => t.classList.remove('sort-asc', 'sort-desc'));
    th.classList.add(sortDir === 'asc' ? 'sort-asc' : 'sort-desc');
    renderTable();
  });
});

// ── Render ────────────────────────────────────────────────────
function renderTable() {
  const sorted  = sortTunes(allTunes);
  const rows    = buildRows(sorted).filter(({ tune, entry }) => rowMatchesFilters(tune, entry));

  tbody.innerHTML = '';
  emptyMsg.hidden = rows.length > 0;

  rows.forEach(({ tune, entry }) => {
    const hasNotes = (tune.notes?.length > 0) || (entry?.notes?.length > 0);
    const tr = document.createElement('tr');
    tr.innerHTML = `
      <td>${esc(tune.name ?? '')}</td>
      <td>${esc(tune.key  ?? '')}</td>
      <td>${esc(tune.source?.name ?? '')}</td>
      <td>${tune.modal ? '<span class="pill pill-yes">Yes</span>' : '<span class="pill" style="background:#222">—</span>'}</td>
      <td>${esc(entry?.instrument_name ?? '')}</td>
      <td>${esc(entry?.tuning ?? '')}</td>
      <td>${pillBool(entry?.callable)}</td>
      <td>${pillBool(entry?.review, true)}</td>
      <td>${pillBool(entry?.to_learn, false, true)}</td>
      <td>${hasNotes
            ? `<button class="action-btn btn-notes" data-tune-id="${tune.id}" data-entry-id="${entry?.id ?? ''}">📝</button>`
            : ''}</td>
      <td><button class="action-btn btn-edit-row"
                  data-tune-id="${tune.id}"
                  data-entry-id="${entry?.id ?? ''}"
                  title="Edit"
                  ${unlocked ? '' : 'hidden'}>✏️</button></td>`;
    tbody.appendChild(tr);
  });

  tbody.querySelectorAll('.btn-notes').forEach(b =>
    b.addEventListener('click', () => openNotesModal(+b.dataset.tuneId, b.dataset.entryId ? +b.dataset.entryId : null)));
  tbody.querySelectorAll('.btn-edit-row').forEach(b =>
    b.addEventListener('click', () => openEdit(+b.dataset.tuneId, b.dataset.entryId ? +b.dataset.entryId : null)));
}

function pillBool(val, warnIfTrue = false, neutralIfTrue = false) {
  if (val === null || val === undefined) return '<span class="pill" style="background:#222">—</span>';
  if (val === true) {
    if (neutralIfTrue || warnIfTrue) return '<span class="pill pill-warn">Yes</span>';
    return '<span class="pill pill-yes">Yes</span>';
  }
  return '<span class="pill pill-no">No</span>';
}

// ── Add / Edit modal ──────────────────────────────────────────
btnAddTune.addEventListener('click', openAdd);

function openAdd() {
  editingTuneId  = null;
  editingEntryId = null;
  $('modal-title').textContent = 'Add tune';
  tuneForm.reset();
  refsList.innerHTML = '';
  sourceInput.value  = '';
  populateInstrumentSelect();
  instrumentSelect.value = '';
  btnDeleteTune.hidden = true;
  btnEditNotes.hidden  = true;
  tuneModal.showModal();
}

function openEdit(tuneId, entryId) {
  editingTuneId  = tuneId;
  editingEntryId = entryId;

  const tune  = allTunes.find(t => t.id === tuneId);
  const entry = entryId ? tune?.instruments.find(e => e.id === entryId) : null;

  $('modal-title').textContent = `Edit: ${tune?.name ?? ''}`;
  tuneForm.reset();

  tuneForm.elements.name.value    = tune?.name  ?? '';
  tuneForm.elements.key.value     = tune?.key   ?? '';
  tuneForm.elements.modal.checked = !!tune?.modal;
  sourceInput.value = tune?.source?.name ?? '';

  // Instrument entry
  populateInstrumentSelect(entry?.instrument_id ?? null);
  if (entry) {
    tuneForm.elements.inst_tuning.value        = entry.tuning       ?? '';
    tuneForm.elements.inst_learned_from.value  = entry.learned_from ?? '';
    tuneForm.elements.inst_date_learned.value  = entry.date_learned ?? '';
    tuneForm.elements.inst_callable.checked    = !!entry.callable;
    tuneForm.elements.inst_review.checked      = !!entry.review;
    tuneForm.elements.inst_to_learn.checked    = !!entry.to_learn;
    tuneForm.elements.inst_difficulty.value    = entry.difficulty   ?? '';
  }

  // References
  refsList.innerHTML = '';
  (tune?.references ?? []).forEach(r => addRefRow(r.link, r.site, r.id));

  btnDeleteTune.hidden = false;
  btnEditNotes.hidden  = false;
  tuneModal.showModal();
}

// ── Reference rows ────────────────────────────────────────────
$('btn-add-ref').addEventListener('click', () => addRefRow());

function addRefRow(link = '', site = '', refId = null) {
  const row = document.createElement('div');
  row.className = 'ref-row';
  row.dataset.refId = refId ?? '';
  row.innerHTML = `<input type="text" placeholder="URL"  value="${esc(link)}" class="ref-link" />
                   <input type="text" placeholder="Site" value="${esc(site)}" class="ref-site" style="max-width:100px" />
                   <button type="button" class="remove-btn">✕</button>`;
  row.querySelector('.remove-btn').addEventListener('click', () => row.remove());
  refsList.appendChild(row);
}

// ── Save ──────────────────────────────────────────────────────
$('btn-save-tune').addEventListener('click', saveTune);
$('btn-cancel').addEventListener('click', () => tuneModal.close());

async function saveTune() {
  const f = tuneForm.elements;

  const tuneBody = {
    name:      f.name.value  || null,
    key:       f.key.value   || null,
    modal:     f.modal.checked,
    source_id: resolveSourceId(sourceInput.value),
  };

  const instId    = instrumentSelect.value ? parseInt(instrumentSelect.value) : null;
  const instBody  = instId ? {
    instrument_id:   instId,
    tuning_id:       resolveTuningId(f.inst_tuning.value),
    learned_from_id: resolveMusicianId(f.inst_learned_from.value),
    date_learned:    f.inst_date_learned.value || null,
    callable:        f.inst_callable.checked,
    review:          f.inst_review.checked,
    to_learn:        f.inst_to_learn.checked,
    difficulty:      f.inst_difficulty.value   || null,
  } : null;

  const references = [...refsList.querySelectorAll('.ref-row')]
    .map(row => ({
      link: row.querySelector('.ref-link').value || null,
      site: row.querySelector('.ref-site').value || null,
    }))
    .filter(r => r.link || r.site);

  try {
    let tuneId = editingTuneId;

    if (tuneId === null) {
      // Create tune
      const created = await apiFetch('/tunes/', {
        method: 'POST',
        body: JSON.stringify({ ...tuneBody, references }),
      });
      tuneId = created.id;
      // Add instrument entry if selected
      if (instBody) {
        await apiFetch(`/tunes/${tuneId}/instruments`, {
          method: 'POST', body: JSON.stringify(instBody),
        });
      }
    } else {
      // Update tune core
      await apiFetch(`/tunes/${tuneId}`, { method: 'PATCH', body: JSON.stringify(tuneBody) });
      // Update or create instrument entry
      if (instBody) {
        if (editingEntryId) {
          await apiFetch(`/tunes/${tuneId}/instruments/${editingEntryId}`, {
            method: 'PATCH', body: JSON.stringify(instBody),
          });
        } else {
          await apiFetch(`/tunes/${tuneId}/instruments`, {
            method: 'POST', body: JSON.stringify(instBody),
          });
        }
      }
    }

    tuneModal.close();
    await loadAll();
  } catch (e) {
    setStatus(e.message, true);
  }
}

// ── Delete ────────────────────────────────────────────────────
btnEditNotes.addEventListener('click', () => {
  tuneModal.close();
  openNotesModal(editingTuneId, editingEntryId);
});

btnDeleteTune.addEventListener('click', async () => {
  const tune = allTunes.find(t => t.id === editingTuneId);
  if (!confirm(`Delete "${tune?.name ?? editingTuneId}" and all its data?`)) return;
  try {
    await apiFetch(`/tunes/${editingTuneId}`, { method: 'DELETE' });
    tuneModal.close();
    await loadAll();
  } catch (e) {
    setStatus(e.message, true);
  }
});

// ── Notes modal ───────────────────────────────────────────────
async function openNotesModal(tuneId, entryId) {
  notesTuneId  = tuneId;
  notesEntryId = entryId;

  const tune  = allTunes.find(t => t.id === tuneId);
  const entry = entryId ? tune?.instruments.find(e => e.id === entryId) : null;

  $('notes-modal-title').textContent = `Notes — ${tune?.name ?? ''}`;
  $('inst-notes-heading').textContent = entry
    ? `${entry.instrument_name} notes`
    : 'Instrument notes';
  $('inst-notes-section').hidden = !entry;

  renderTuneNotes(tune?.notes ?? []);
  renderInstNotes(entry?.notes ?? []);

  $('btn-add-tune-note').hidden = !unlocked;
  $('btn-add-inst-note').hidden = !unlocked || !entry;

  notesModal.showModal();
}

function renderTuneNotes(notes) {
  const list = $('tune-notes-list');
  list.innerHTML = '';
  notes.forEach(n => {
    const row = document.createElement('div');
    row.className = 'note-row';
    row.innerHTML = `<span class="note-text">${esc(n.note)}</span>
      <span class="note-edit-controls" ${unlocked ? '' : 'hidden'}>
        <button class="action-btn btn-edit-note" data-id="${n.id}">✏️</button>
        <button class="action-btn btn-delete-note remove-btn" data-id="${n.id}">✕</button>
      </span>`;
    row.querySelector('.btn-edit-note')?.addEventListener('click', () => editTuneNote(n));
    row.querySelector('.btn-delete-note')?.addEventListener('click', () => deleteTuneNote(n.id));
    list.appendChild(row);
  });
}

function renderInstNotes(notes) {
  const list = $('inst-notes-list');
  list.innerHTML = '';
  notes.forEach(n => {
    const row = document.createElement('div');
    row.className = 'note-row';
    row.innerHTML = `<span class="note-text">${esc(n.note)}</span>
      <span class="note-edit-controls" ${unlocked ? '' : 'hidden'}>
        <button class="action-btn btn-edit-note" data-id="${n.id}">✏️</button>
        <button class="action-btn btn-delete-note remove-btn" data-id="${n.id}">✕</button>
      </span>`;
    row.querySelector('.btn-edit-note')?.addEventListener('click', () => editInstNote(n));
    row.querySelector('.btn-delete-note')?.addEventListener('click', () => deleteInstNote(n.id));
    list.appendChild(row);
  });
}

$('btn-add-tune-note').addEventListener('click', async () => {
  const text = prompt('Note:');
  if (!text) return;
  try {
    await apiFetch(`/tunes/${notesTuneId}/notes`, { method: 'POST', body: JSON.stringify({ note: text }) });
    await reloadNotesModal();
  } catch (e) { setStatus(e.message, true); }
});

$('btn-add-inst-note').addEventListener('click', async () => {
  const text = prompt('Note:');
  if (!text) return;
  try {
    await apiFetch(`/tunes/${notesTuneId}/instruments/${notesEntryId}/notes`,
                   { method: 'POST', body: JSON.stringify({ note: text }) });
    await reloadNotesModal();
  } catch (e) { setStatus(e.message, true); }
});

async function editTuneNote(n) {
  const text = prompt('Edit note:', n.note);
  if (text === null) return;
  try {
    await apiFetch(`/tunes/${notesTuneId}/notes/${n.id}`,
                   { method: 'PATCH', body: JSON.stringify({ note: text }) });
    await reloadNotesModal();
  } catch (e) { setStatus(e.message, true); }
}

async function deleteTuneNote(noteId) {
  if (!confirm('Delete this note?')) return;
  try {
    await apiFetch(`/tunes/${notesTuneId}/notes/${noteId}`, { method: 'DELETE' });
    await reloadNotesModal();
  } catch (e) { setStatus(e.message, true); }
}

async function editInstNote(n) {
  const text = prompt('Edit note:', n.note);
  if (text === null) return;
  try {
    await apiFetch(`/tunes/${notesTuneId}/instruments/${notesEntryId}/notes/${n.id}`,
                   { method: 'PATCH', body: JSON.stringify({ note: text }) });
    await reloadNotesModal();
  } catch (e) { setStatus(e.message, true); }
}

async function deleteInstNote(noteId) {
  if (!confirm('Delete this note?')) return;
  try {
    await apiFetch(`/tunes/${notesTuneId}/instruments/${notesEntryId}/notes/${noteId}`,
                   { method: 'DELETE' });
    await reloadNotesModal();
  } catch (e) { setStatus(e.message, true); }
}

async function reloadNotesModal() {
  await loadAll();
  const tune  = allTunes.find(t => t.id === notesTuneId);
  const entry = notesEntryId ? tune?.instruments.find(e => e.id === notesEntryId) : null;
  renderTuneNotes(tune?.notes ?? []);
  renderInstNotes(entry?.notes ?? []);
}

$('btn-notes-close').addEventListener('click', () => notesModal.close());

// ── Utility ───────────────────────────────────────────────────
function esc(str) {
  if (str === null || str === undefined) return '';
  return String(str)
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;');
}

// ── Boot ─────────────────────────────────────────────────────
loadAll();