(function() {
  const BrandCatalog = {
    currentBrand: null,
    currentCategory: null,
    state: 'brands',
    _lastItems: [],

    el: function(id) { return document.getElementById(id); },

    show: function() {
      this.el('brandCatalogOverlay').style.display = 'block';
      document.body.style.overflow = 'hidden';
      this.loadBrands();
    },

    hide: function() {
      this.el('brandCatalogOverlay').style.display = 'none';
      document.body.style.overflow = '';
      this.reset();
    },

    reset: function() {
      this.currentBrand = null;
      this.currentCategory = null;
      this.state = 'brands';
      this._lastItems = [];
    },

    loading: function(on) {
      this.el('brandCatalogLoading').style.display = on ? 'block' : 'none';
    },

    setContent: function(html) {
      this.el('brandCatalogContent').innerHTML = html;
    },

    setBreadcrumb: function(html) {
      this.el('brandCatalogBreadcrumb').innerHTML = html;
    },

    loadBrands: function() {
      this.loading(true);
      this.state = 'brands';
      this.setBreadcrumb('<strong>Marcas de vehiculo</strong>');
      fetch('/pos/api/catalog/vehicle-brands')
        .then(r => r.json())
        .then(data => {
          this.loading(false);
          if (!data.brands || !data.brands.length) {
            this.setContent('<p style="grid-column:1/-1;text-align:center;color:var(--color-text-muted);">No se encontraron marcas.</p>');
            return;
          }
          let html = '';
          data.brands.forEach(b => {
            html += '<div class="catalog-category-card" onclick="BrandCatalog.selectBrand(' + JSON.stringify(b.name) + ')">' +
              '<div style="font-size:var(--text-h4);font-family:var(--font-heading);margin-bottom:4px;">' + escapeHtml(b.name) + '</div>' +
              '<div style="font-size:var(--text-body-sm);color:var(--color-text-muted);">' + (b.part_count || 0) + ' refacciones</div>' +
              '</div>';
          });
          this.setContent(html);
        })
        .catch(err => {
          this.loading(false);
          this.setContent('<p style="grid-column:1/-1;text-align:center;color:var(--color-error);">Error al cargar marcas: ' + escapeHtml(err.message) + '</p>');
        });
    },

    selectBrand: function(brandName) {
      this.currentBrand = brandName;
      this.loadCategories(brandName);
    },

    loadCategories: function(brandName) {
      this.loading(true);
      this.state = 'categories';
      this.setBreadcrumb(
        '<a href="javascript:void(0)" onclick="BrandCatalog.loadBrands()" style="color:var(--color-primary);text-decoration:none;">Marcas</a> &rsaquo; <strong>' + escapeHtml(brandName) + '</strong>'
      );
      fetch('/pos/api/catalog/brand-categories?brand=' + encodeURIComponent(brandName))
        .then(r => r.json())
        .then(data => {
          this.loading(false);
          if (!data.categories || !data.categories.length) {
            this.setContent('<p style="grid-column:1/-1;text-align:center;color:var(--color-text-muted);">No se encontraron categorias para esta marca.</p>');
            return;
          }
          let html = '';
          data.categories.forEach(c => {
            html += '<div class="catalog-category-card" onclick="BrandCatalog.selectCategory(' + c.id + ', ' + JSON.stringify(c.name) + ')">' +
              '<div style="font-size:var(--text-h4);font-family:var(--font-heading);margin-bottom:4px;">' + escapeHtml(c.name) + '</div>' +
              '<div style="font-size:var(--text-body-sm);color:var(--color-text-muted);">' + c.part_count + ' refacciones</div>' +
              '</div>';
          });
          this.setContent(html);
        })
        .catch(err => {
          this.loading(false);
          this.setContent('<p style="grid-column:1/-1;text-align:center;color:var(--color-error);">Error al cargar categorias: ' + escapeHtml(err.message) + '</p>');
        });
    },

    selectCategory: function(catId, catName) {
      this.currentCategory = { id: catId, name: catName };
      this.loadParts(this.currentBrand, catId);
    },

    loadParts: function(brandName, categoryId) {
      this.loading(true);
      this.state = 'parts';
      this.setBreadcrumb(
        '<a href="javascript:void(0)" onclick="BrandCatalog.loadBrands()" style="color:var(--color-primary);text-decoration:none;">Marcas</a> &rsaquo; ' +
        '<a href="javascript:void(0)" onclick="BrandCatalog.selectBrand(' + JSON.stringify(brandName) + ')" style="color:var(--color-primary);text-decoration:none;">' + escapeHtml(brandName) + '</a> &rsaquo; ' +
        '<strong>' + escapeHtml(this.currentCategory.name) + '</strong>'
      );
      fetch('/pos/api/catalog/brand-parts?brand=' + encodeURIComponent(brandName) + '&category_id=' + encodeURIComponent(categoryId))
        .then(r => r.json())
        .then(data => {
          this.loading(false);
          this._lastItems = data.items || [];
          if (!data.items || !data.items.length) {
            this.setContent('<p style="grid-column:1/-1;text-align:center;color:var(--color-text-muted);">No se encontraron refacciones.</p>');
            return;
          }
          let html = '<div style="grid-column:1/-1;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--space-3);">';
          data.items.forEach(p => {
            const price = p.local_price ? '$' + Number(p.local_price).toFixed(2) : 'Consultar precio';
            const img = '/pos/static/images/placeholder-part.png';
            html += '<div class="catalog-category-card" style="padding:0;overflow:hidden;">' +
              '<div style="height:160px;background:#f5f5f5;display:flex;align-items:center;justify-content:center;">' +
                '<img src="' + escapeHtml(img) + '" alt="" style="max-width:100%;max-height:100%;object-fit:contain;">' +
              '</div>' +
              '<div style="padding:var(--space-3);">' +
                '<div style="font-weight:600;font-size:var(--text-body);margin-bottom:4px;">' + escapeHtml(p.oem_part_number || 'N/A') + '</div>' +
                '<div style="font-size:var(--text-body-sm);color:var(--color-text-muted);margin-bottom:8px;min-height:36px;">' + escapeHtml(p.name || '') + '</div>' +
                '<div style="font-size:var(--text-h5);font-weight:700;color:var(--color-primary);margin-bottom:8px;">' + price + '</div>' +
                '<button class="btn btn--primary btn--sm" style="width:100%;" onclick="BrandCatalog.addToCart(' + p.id + ', event)">Agregar</button>' +
              '</div>' +
              '</div>';
          });
          html += '</div>';
          this.setContent(html);
        })
        .catch(err => {
          this.loading(false);
          this.setContent('<p style="grid-column:1/-1;text-align:center;color:var(--color-error);">Error al cargar refacciones: ' + escapeHtml(err.message) + '</p>');
        });
    },

    addToCart: function(partId, event) {
      if (event) event.stopPropagation();
      const part = this._lastItems.find(function(p) { return p.id === partId; });
      if (!part) {
        alert('Error: no se encontro la refaccion');
        return;
      }
      if (window.CatalogApp && CatalogApp.addToCart) {
        CatalogApp.addToCart({
          id: part.id,
          part_number: part.oem_part_number || 'N/A',
          name: part.name || 'Refaccion',
          brand: '',
          price: part.local_price || 0,
          tax_rate: 0.16,
          unit: 'PZA',
          stock: part.local_stock || 0,
          source: 'oem-brand',
          inventory_id: null
        }, 1);
        const btn = event.target;
        const oldText = btn.textContent;
        btn.textContent = 'Agregado!';
        btn.style.background = 'var(--color-success)';
        setTimeout(function() { btn.textContent = oldText; btn.style.background = ''; }, 1500);
        return;
      }
      alert('Carrito no disponible. Asegurate de que la pagina haya cargado completamente.');
    }
  };

  function escapeHtml(text) {
    if (!text) return '';
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
  }

  window.BrandCatalog = BrandCatalog;
})();