/* App-Controller — UI-Bindings, State-Sync, Excel */
/* global window, document */

(() => {
  const { Calc, Store, Excel } = window;

  /** @type {Array} */
  let projects = Store.load();
  let currentId = Store.getCurrentId();

  const $ = (sel) => document.querySelector(sel);
  const $$ = (sel) => Array.from(document.querySelectorAll(sel));

  const fmtEur = (v) =>
    new Intl.NumberFormat('de-DE', {
      style: 'currency', currency: 'EUR', minimumFractionDigits: 2,
    }).format(v || 0);

  const ensureProject = () => {
    if (projects.length === 0) {
      const p = Store.makeDefault('Neues Projekt');
      projects.push(p);
      currentId = p.id;
      Store.save(projects);
      Store.setCurrentId(currentId);
    } else if (!currentId || !projects.find((p) => p.id === currentId)) {
      currentId = projects[0].id;
      Store.setCurrentId(currentId);
    }
  };

  const getCurrent = () => projects.find((p) => p.id === currentId);

  const renderProjects = () => {
    const nav = $('#projects');
    nav.innerHTML = '';
    projects.forEach((p) => {
      const el = document.createElement('div');
      el.className = 'project-item' + (p.id === currentId ? ' active' : '');
      el.textContent = p.projectName || 'Unbenannt';
      el.title = p.projectName || '';
      el.addEventListener('click', () => {
        currentId = p.id;
        Store.setCurrentId(currentId);
        renderProjects();
        syncFormFromState();
        recalc();
      });
      nav.appendChild(el);
    });
  };

  const syncFormFromState = () => {
    const p = getCurrent();
    if (!p) return;
    Store.FIELDS.forEach((f) => {
      const el = document.querySelector(`[data-field="${f}"]`);
      if (!el) return;
      el.value = p[f] ?? '';
    });
    $('#current-project-name').textContent = p.projectName || 'Unbenanntes Projekt';
  };

  const syncStateFromForm = () => {
    const p = getCurrent();
    if (!p) return;
    Store.FIELDS.forEach((f) => {
      const el = document.querySelector(`[data-field="${f}"]`);
      if (!el) return;
      const raw = el.value;
      if (el.type === 'number') {
        p[f] = raw === '' ? 0 : parseFloat(raw);
      } else {
        p[f] = raw;
      }
    });
    p.updatedAt = new Date().toISOString();
    Store.save(projects);
    $('#current-project-name').textContent = p.projectName || 'Unbenanntes Projekt';
  };

  const recalc = () => {
    const p = getCurrent();
    if (!p) return;
    const r = Calc.calculate(p);
    $('#r-unitNet').textContent = fmtEur(r.unitNet);
    $('#r-unitGross').textContent = fmtEur(r.unitGross);
    $('#r-totalGross').textContent = fmtEur(r.totalGross);
    $('#r-margin').textContent = fmtEur(r.margin);
    $('#r-c1').textContent = fmtEur(r.materialCost);
    $('#r-c2').textContent = fmtEur(r.machineCost);
    $('#r-c3').textContent = fmtEur(r.energyCost);
    $('#r-c4').textContent = fmtEur(r.postCost);
    $('#r-c5').textContent = fmtEur(r.totalProduction);
    $('#r-c6').textContent = fmtEur(r.scrapSurcharge);
    $('#r-c7').textContent = fmtEur(r.subtotalNet);
    $('#r-c9').textContent = fmtEur(r.customerNet);
  };

  const attachFieldListeners = () => {
    $$('[data-field]').forEach((el) => {
      el.addEventListener('input', () => {
        syncStateFromForm();
        if (el.dataset.field !== 'projectName') {
          recalc();
        } else {
          renderProjects();
        }
      });
    });
  };

  const newProject = () => {
    const p = Store.makeDefault('Neues Projekt ' + (projects.length + 1));
    projects.push(p);
    currentId = p.id;
    Store.save(projects);
    Store.setCurrentId(currentId);
    renderProjects();
    syncFormFromState();
    recalc();
  };

  const duplicateProject = () => {
    const cur = getCurrent();
    if (!cur) return;
    const clone = { ...cur, id: 'p_' + Date.now() + '_' + Math.random().toString(36).slice(2, 7), projectName: (cur.projectName || 'Projekt') + ' (Kopie)', createdAt: new Date().toISOString(), updatedAt: new Date().toISOString() };
    projects.push(clone);
    currentId = clone.id;
    Store.save(projects);
    Store.setCurrentId(currentId);
    renderProjects();
    syncFormFromState();
    recalc();
  };

  const deleteProject = () => {
    if (projects.length === 0) return;
    const cur = getCurrent();
    const ok = confirm(`Projekt "${cur?.projectName || 'Unbenannt'}" wirklich loeschen?`);
    if (!ok) return;
    projects = projects.filter((p) => p.id !== currentId);
    if (projects.length === 0) {
      ensureProject();
    } else {
      currentId = projects[0].id;
      Store.setCurrentId(currentId);
    }
    Store.save(projects);
    renderProjects();
    syncFormFromState();
    recalc();
  };

  const exportCurrent = () => {
    const p = getCurrent();
    if (!p) return;
    const r = Calc.calculate(p);
    try {
      Excel.exportXlsx(p, r);
    } catch (e) {
      alert('Export fehlgeschlagen: ' + e.message);
    }
  };

  const importFile = async (file) => {
    try {
      const updates = await Excel.importXlsx(file);
      const p = getCurrent();
      if (!p) return;
      Object.entries(updates).forEach(([k, v]) => {
        if (Store.FIELDS.includes(k)) {
          if (typeof p[k] === 'number' || ['materialCostPerKg','materialUsageG','printTimeH','machineRate','powerKwh','powerPrice','postMin','postRate','packagingCost','shippingCost','setupCost','scrapPct','marginPct','quantity','individualAdjustment','vatPct'].includes(k)) {
            const n = parseFloat(v);
            p[k] = Number.isFinite(n) ? n : 0;
          } else {
            p[k] = String(v ?? '');
          }
        }
      });
      p.updatedAt = new Date().toISOString();
      Store.save(projects);
      renderProjects();
      syncFormFromState();
      recalc();
      $('#dropzone').classList.remove('visible');
    } catch (e) {
      alert('Import fehlgeschlagen: ' + e.message);
    }
  };

  const initDragDrop = () => {
    const dz = $('#dropzone');
    const show = () => dz.classList.add('visible');
    const hide = () => dz.classList.remove('visible');
    ['dragenter', 'dragover'].forEach((ev) => {
      window.addEventListener(ev, (e) => {
        if (e.dataTransfer && Array.from(e.dataTransfer.types).includes('Files')) {
          e.preventDefault();
          show();
          dz.classList.add('dragover');
        }
      });
    });
    ['dragleave', 'dragend'].forEach((ev) => {
      dz.addEventListener(ev, () => dz.classList.remove('dragover'));
    });
    dz.addEventListener('drop', (e) => {
      e.preventDefault();
      dz.classList.remove('dragover');
      hide();
      const f = e.dataTransfer?.files?.[0];
      if (f) importFile(f);
    });
    window.addEventListener('drop', (e) => { e.preventDefault(); hide(); });
    window.addEventListener('dragleave', (e) => {
      if (e.clientX === 0 && e.clientY === 0) hide();
    });
  };

  const initButtons = () => {
    $('#btn-new').addEventListener('click', newProject);
    $('#btn-duplicate').addEventListener('click', duplicateProject);
    $('#btn-delete').addEventListener('click', deleteProject);
    $('#btn-export').addEventListener('click', exportCurrent);
    $('#btn-import').addEventListener('click', () => $('#file-input').click());
    $('#file-input').addEventListener('change', (e) => {
      const f = e.target.files?.[0];
      if (f) importFile(f);
      e.target.value = '';
    });
  };

  const init = () => {
    ensureProject();
    renderProjects();
    syncFormFromState();
    attachFieldListeners();
    initButtons();
    initDragDrop();
    recalc();
  };

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();