/*!
 * Tectum
 * Copyright © 2026 Machiel Heinen.
 * Alle rechten voorbehouden. Gebruik uitsluitend met schriftelijke toestemming.
 * Zie LICENTIE.md.
 */
// ============================================================
// cost/cost-settings.js — CostSettings: venster "Kosten & tijden". Bouwt
// het formulier automatisch uit COST_DEFAULTS (elk item een invoerveld),
// opslaan via CostModel.saveSettings (localStorage). Exporteren/importeren
// als JSON-bestand; "Standaard" zet alle velden terug op cost-defaults.js.
// Alleen UI; de rekenregels staan in CostModel.
// ============================================================

window.CostSettings = (() => {
  let overlay = null;

  const esc = UI.esc;

  function build() {
    overlay = document.createElement('div');
    overlay.id = 'cost-settings-overlay';
    overlay.innerHTML = `
      <div id="cost-settings-modal">
        <div class="modal-header">
          <h2>Kosten &amp; tijden</h2>
          <button type="button" class="modal-close-x" data-cs="cancel">&times;</button>
        </div>
        <div class="cs-body"></div>
        <div class="material-info">Bedragen excl. btw. Opslaan bewaart in deze browser én downloadt een JSON-bestand; een gewijzigd veld is gemarkeerd. Standaardwaarden staan in js/cost/cost-defaults.js.</div>
        <div class="modal-footer">
          <button type="button" class="io-btn" data-cs="reset">Standaard</button>
          <button type="button" class="io-btn" data-cs="export">Exporteren&hellip;</button>
          <button type="button" class="io-btn" data-cs="import">Importeren&hellip;</button>
          <span style="flex:1"></span>
          <button type="button" class="io-btn" data-cs="cancel">Annuleren</button>
          <button type="button" class="material-toggle-btn active" data-cs="save" style="flex:none; padding:6px 18px;">Opslaan</button>
        </div>
        <input type="file" accept=".json,application/json" style="display:none">
      </div>`;
    document.body.appendChild(overlay);
    overlay.addEventListener('click', (e) => {
      if (e.target === overlay) return close();
      const btn = e.target.closest('[data-cs]');
      if (!btn) return;
      const a = btn.dataset.cs;
      if (a === 'cancel') close();
      else if (a === 'save') { // ook als JSON-bestand (om te delen/bewaren)
        const v = readForm();
        CostModel.saveSettings(v);
        download(CostModel.exportJson(v));
        close();
      }
      else if (a === 'reset') fill(CostModel.defaultValues());
      else if (a === 'export') download(CostModel.exportJson(readForm()));
      else if (a === 'import') overlay.querySelector('input[type=file]').click();
    });
    overlay.addEventListener('input', markChanged);
    overlay.querySelector('input[type=file]').addEventListener('change', (e) => {
      const file = e.target.files[0];
      e.target.value = '';
      if (!file) return;
      file.text().then(txt => fill(CostModel.importJson(JSON.parse(txt))))
        .catch(err => alert('Importeren mislukt: ' + err.message));
    });
  }

  function renderForm() {
    const body = overlay.querySelector('.cs-body');
    body.innerHTML = Object.entries(window.COST_DEFAULTS).map(([g, grp]) => `
      <section class="cs-group">
        <h3>${esc(grp.label)}</h3>
        ${Object.entries(grp.items).map(([k, it]) => `
          <label class="cs-row">
            <span class="cs-label">${esc(it.label)}</span>
            ${it.options
              ? `<select data-g="${g}" data-k="${k}">${Object.entries(it.options).map(([v, t]) => `<option value="${esc(v)}">${esc(t)}</option>`).join('')}</select>`
              : `<input type="number" step="any" data-g="${g}" data-k="${k}">`}
            <span class="cs-unit">${esc(it.unit || '')}</span>
          </label>`).join('')}
      </section>`).join('');
  }

  function fill(values) {
    overlay.querySelectorAll('[data-g]').forEach(el => { el.value = values[el.dataset.g][el.dataset.k]; });
    markChanged();
  }
  function readForm() {
    const v = CostModel.getSettings();
    overlay.querySelectorAll('[data-g]').forEach(el => {
      const it = window.COST_DEFAULTS[el.dataset.g].items[el.dataset.k];
      const val = it.options ? el.value : parseFloat(el.value);
      if (it.options || isFinite(val)) v[el.dataset.g][el.dataset.k] = val;
    });
    return v;
  }
  // Afwijkend van de standaard: gemarkeerd.
  function markChanged() {
    const def = CostModel.defaultValues();
    overlay.querySelectorAll('[data-g]').forEach(el => {
      const d = def[el.dataset.g][el.dataset.k];
      el.closest('.cs-row').classList.toggle('changed', typeof d === 'number' ? parseFloat(el.value) !== d : el.value !== d);
    });
  }

  function download(obj) {
    const blob = new Blob([JSON.stringify(obj, null, 2)], { type: 'application/json' });
    const a = document.createElement('a');
    a.href = URL.createObjectURL(blob);
    a.download = `tectum-kosten-${new Date().toISOString().slice(0, 10)}.json`;
    a.click();
    setTimeout(() => URL.revokeObjectURL(a.href), 1000);
  }

  function open() {
    if (!overlay) build();
    renderForm(); // opnieuw: nieuwe items in cost-defaults.js verschijnen vanzelf
    fill(CostModel.getSettings());
    overlay.classList.add('open');
  }
  function close() { if (overlay) overlay.classList.remove('open'); }

  return { open, close };
})();