(function() {
  'use strict';

  const API = '/pos/api/supplier-catalog';
  const VEHICLE_API = '/pos/api/inventory/vehicles';
  const token = localStorage.getItem('pos_token') || '';

  let state = {
    q: '',
    category: '',
    make: '',
    model: '',
    year: '',
    engine: '',
    myeId: null,
    page: 1,
    perPage: 30,
    totalPages: 1,
    categories: [],
    items: []
  };

  function headers() {
    return { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' };
  }

  let scAbort = null;
  let scSeq = 0;

  async function apiFetch(url) {
    if (scAbort) {
      scAbort.abort();
      scAbort = null;
    }
    const ctrl = new AbortController();
    scAbort = ctrl;
    try {
      const resp = await fetch(url, { headers: headers(), signal: ctrl.signal });
      if (resp.status === 401) { window.location.href = '/pos/login'; return null; }
      if (!resp.ok) { console.error('API error', url, resp.status); return null; }
      return resp.json();
    } catch (e) {
      if (e.name === 'AbortError') return null;
      console.error('API error', url, e);
      return null;
    }
  }

  async function apiFetchSeq(url) {
    const mySeq = ++scSeq;
    const data = await apiFetch(url);
    if (!data || scSeq !== mySeq) return null;
    return data;
  }

  // ─── Categories ─────────────────────────────────────────────
  async function loadCategories() {
    const data = await apiFetch(API + '/categories');
    if (!data) return;
    state.categories = data.categories || [];
    renderCategories();
  }

  function renderCategories() {
    const el = document.getElementById('categoriesGrid');
    if (!el) return;
    let html = '<div class="sc-cat-card' + (state.category === '' ? ' active' : '') + '" onclick="selectCategory(\'\')">' +
      '<div>Todas</div><div class="count">' + state.categories.reduce((a,c)=>a+c.count,0) + ' items</div></div>';
    state.categories.forEach(function(c) {
      html += '<div class="sc-cat-card' + (state.category === c.name ? ' active' : '') + '" onclick="selectCategory(\'' + escapeHtml(c.name) + '\')">' +
        '<div>' + escapeHtml(c.name) + '</div><div class="count">' + c.count + ' items</div></div>';
    });
    el.innerHTML = html;
  }

  window.selectCategory = function(name) {
    state.category = name;
    state.page = 1;
    renderCategories();
    doSearch();
  };

  // ─── Vehicle filters ────────────────────────────────────────
  async function loadMakes() {
    const data = await apiFetch(VEHICLE_API + '/makes');
    if (!data) return;
    const sel = document.getElementById('filterMake');
    sel.innerHTML = '<option value="">Marca vehiculo</option>';
    (data.data || []).forEach(function(m) {
      sel.innerHTML += '<option value="' + escapeHtml(m.name_brand) + '">' + escapeHtml(m.name_brand) + '</option>';
    });
  }

  window.onMakeChange = async function() {
    const sel = document.getElementById('filterMake');
    state.make = sel.value;
    state.model = ''; state.year = ''; state.engine = ''; state.myeId = null;
    document.getElementById('filterModel').disabled = true;
    document.getElementById('filterYear').disabled = true;
    document.getElementById('filterEngine').disabled = true;
    if (!state.make) { doSearch(); return; }

    const makes = await apiFetchSeq(VEHICLE_API + '/makes');
    if (!makes) return;
    const brand = (makes.data || []).find(function(m) { return m.name_brand === state.make; });
    if (!brand) { doSearch(); return; }

    const models = await apiFetchSeq(VEHICLE_API + '/models?brand_id=' + brand.id_brand);
    if (!models) return;
    const msel = document.getElementById('filterModel');
    msel.innerHTML = '<option value="">Modelo</option>';
    (models.data || []).forEach(function(m) {
      msel.innerHTML += '<option value="' + m.id_model + '">' + escapeHtml(m.name_model) + '</option>';
    });
    msel.disabled = false;
    doSearch();
  };

  window.onModelChange = async function() {
    const sel = document.getElementById('filterModel');
    const modelId = sel.value;
    state.model = modelId ? sel.options[sel.selectedIndex].text : '';
    state.year = ''; state.engine = ''; state.myeId = null;
    document.getElementById('filterYear').disabled = true;
    document.getElementById('filterEngine').disabled = true;
    if (!modelId) { doSearch(); return; }

    const years = await apiFetchSeq(VEHICLE_API + '/years?model_id=' + modelId);
    if (!years) return;
    const ysel = document.getElementById('filterYear');
    ysel.innerHTML = '<option value="">Año</option>';
    (years.data || []).forEach(function(y) {
      ysel.innerHTML += '<option value="' + y.id_year + '">' + y.year_car + '</option>';
    });
    ysel.disabled = false;
    doSearch();
  };

  window.onYearChange = async function() {
    const sel = document.getElementById('filterYear');
    const yearId = sel.value;
    const modelId = document.getElementById('filterModel').value;
    state.year = yearId ? sel.options[sel.selectedIndex].text : '';
    state.engine = ''; state.myeId = null;
    document.getElementById('filterEngine').disabled = true;
    if (!yearId || !modelId) { doSearch(); return; }

    const engines = await apiFetchSeq(VEHICLE_API + '/engines?model_id=' + modelId + '&year_id=' + yearId);
    if (!engines) return;
    const esel = document.getElementById('filterEngine');
    esel.innerHTML = '<option value="">Motorizacion</option>';
    (engines.data || []).forEach(function(e) {
      const label = escapeHtml(e.name_engine) + (e.trim_level ? ' (' + escapeHtml(e.trim_level) + ')' : '');
      esel.innerHTML += '<option value="' + e.id_mye + '">' + label + '</option>';
    });
    esel.disabled = false;
    doSearch();
  };

  // ─── Search ─────────────────────────────────────────────────
  window.doSearch = async function() {
    state.q = document.getElementById('searchInput').value.trim();
    const engineSel = document.getElementById('filterEngine');
    state.myeId = engineSel.value || null;

    let url = API + '/search?page=' + state.page + '&per_page=' + state.perPage;
    if (state.q) url += '&q=' + encodeURIComponent(state.q);
    if (state.category) url += '&category=' + encodeURIComponent(state.category);
    if (state.myeId) {
      url += '&mye_id=' + state.myeId;
    } else {
      if (state.make) url += '&make=' + encodeURIComponent(state.make);
      if (state.model) url += '&model=' + encodeURIComponent(state.model);
      if (state.year) url += '&year=' + encodeURIComponent(state.year);
    }

    const data = await apiFetch(url);
    if (!data) return;
    state.items = data.data || [];
    state.totalPages = (data.pagination || {}).total_pages || 1;
    renderItems();
    renderPagination();
  };

  window.clearFilters = function() {
    document.getElementById('searchInput').value = '';
    document.getElementById('filterMake').value = '';
    document.getElementById('filterModel').innerHTML = '<option value="">Modelo</option>'; document.getElementById('filterModel').disabled = true;
    document.getElementById('filterYear').innerHTML = '<option value="">Año</option>'; document.getElementById('filterYear').disabled = true;
    document.getElementById('filterEngine').innerHTML = '<option value="">Motorizacion</option>'; document.getElementById('filterEngine').disabled = true;
    state.q = ''; state.category = ''; state.make = ''; state.model = ''; state.year = ''; state.engine = ''; state.myeId = null; state.page = 1;
    renderCategories();
    doSearch();
  };

  // ─── Render results ─────────────────────────────────────────
  function renderItems() {
    const el = document.getElementById('partsGrid');
    if (!el) return;
    if (!state.items.length) {
      el.innerHTML = '<div class="sc-empty" style="grid-column:1/-1;"><div style="font-size:48px;margin-bottom:var(--space-4);">🔍</div><h3>Sin resultados</h3><p>Intenta con otros filtros o terminos de busqueda.</p></div>';
      return;
    }
    el.innerHTML = state.items.map(function(it) {
      return '<div class="sc-card" onclick="openDetail(' + it.id + ')">' +
        '<div class="sc-card__sku">' + escapeHtml(it.sku) + '</div>' +
        '<div class="sc-card__name">' + escapeHtml(it.name) + '</div>' +
        '<div class="sc-card__meta">' +
          '<span class="sc-card__badge">' + escapeHtml(it.category || 'SIN CATEGORIA') + '</span>' +
          ' <span>' + escapeHtml(it.supplier_name) + '</span>' +
        '</div>' +
      '</div>';
    }).join('');
  }

  function renderPagination() {
    const el = document.getElementById('pagination');
    if (!el) return;
    if (state.totalPages <= 1) { el.innerHTML = ''; return; }
    let html = '<button ' + (state.page <= 1 ? 'disabled' : '') + ' onclick="goPage(' + (state.page - 1) + ')">Anterior</button>';
    html += '<span>Pagina ' + state.page + ' de ' + state.totalPages + '</span>';
    html += '<button ' + (state.page >= state.totalPages ? 'disabled' : '') + ' onclick="goPage(' + (state.page + 1) + ')">Siguiente</button>';
    el.innerHTML = html;
  }

  window.goPage = function(p) {
    state.page = p;
    doSearch();
  };

  // ─── Detail modal ───────────────────────────────────────────
  window.openDetail = async function(id) {
    const data = await apiFetch(API + '/items/' + id);
    if (!data) return;
    document.getElementById('modalTitle').textContent = escapeHtml(data.sku);
    let html = '';
    html += '<div><strong style="font-size:var(--text-h6);">' + escapeHtml(data.name) + '</strong></div>';
    html += '<div class="sc-modal__section"><h4>Informacion</h4>' +
      '<p>Proveedor: ' + escapeHtml(data.supplier_name) + '<br>Categoria: ' + escapeHtml(data.category || 'N/A') + '</p></div>';

    if (data.interchanges && data.interchanges.length) {
      html += '<div class="sc-modal__section"><h4>Intercambios</h4><div class="sc-interchange-list">' +
        data.interchanges.map(function(ix) {
          return '<span class="sc-interchange-chip">' + escapeHtml(ix.brand) + ' — ' + escapeHtml(ix.part_number) + '</span>';
        }).join('') + '</div></div>';
    }

    if (data.compatibilities && data.compatibilities.length) {
      var seenCompat = {};
      var uniqCompat = data.compatibilities.filter(function(c) {
        var key = (c.make || '') + '|' + (c.model || '') + '|' + (c.year || '') + '|' + (c.engine || '');
        if (seenCompat[key]) return false;
        seenCompat[key] = true;
        return true;
      });
      html += '<div class="sc-modal__section"><h4>Vehiculos compatibles (' + uniqCompat.length + ')</h4>' +
        '<div class="sc-compat-grid">' +
        uniqCompat.slice(0, 50).map(function(c) {
          return '<div class="sc-compat-item">' +
            '<strong>' + escapeHtml(c.make || '') + ' ' + escapeHtml(c.model || '') + '</strong><br>' +
            (c.year || '') + ' ' + escapeHtml(c.engine || '') +
          '</div>';
        }).join('') +
        (uniqCompat.length > 50 ? '<div style="grid-column:1/-1;text-align:center;color:var(--color-text-muted);">... y ' + (uniqCompat.length - 50) + ' mas</div>' : '') +
        '</div></div>';
    }

    document.getElementById('modalBody').innerHTML = html;
    document.getElementById('detailModal').classList.add('open');
  };

  window.closeModal = function() {
    document.getElementById('detailModal').classList.remove('open');
  };

  // ─── Utils ──────────────────────────────────────────────────
  function escapeHtml(s) {
    if (s == null) return '';
    return String(s).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
  }

  // ─── Init ───────────────────────────────────────────────────
  function init() {
    if (!token) { window.location.href = '/pos/login'; return; }
    loadCategories();
    loadMakes();
    doSearch().then(function() {
      var params = new URLSearchParams(window.location.search);
      var id = params.get('id');
      if (id) { openDetail(parseInt(id)); }
    });
  }

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