/**
 * ROLLCALC IMPROVEMENTS V14
 * Article selection + automatic weight calculation
 */

function populateArticleDropdowns_v14() {
  const data = window.ARTICLE_DATA || [];
  console.log('[ArticleDropdown] Populating with', data.length, 'articles');
  
  ['d-art', 'e-art'].forEach(function(inputId) {
    const dl = document.getElementById(inputId + '-list');
    if (!dl) return;
    
    data.forEach(function(article) {
      const displayText = article.nr + ' – ' + article.name;
      const opt = document.createElement('option');
      opt.value = displayText;
      opt.dataset.articleNr = article.nr;
      opt.dataset.thickness = article.thickness || 0;
      opt.dataset.areaWeight = article.area_weight || 0;
      opt.dataset.width = extractWidthFromName(article.name) || 0;
      opt.dataset.stddev_thickness = article.thickness_stddev || 0;
      opt.dataset.stddev_areaweight = article.area_weight_stddev || 0;
      dl.appendChild(opt);
    });
  });
  
  const dArt = document.getElementById('d-art');
  if (dArt) {
    dArt.addEventListener('input', function() {
      const inputVal = dArt.value.trim();
      const match = data.find(function(a) {
        const displayText = a.nr + ' – ' + a.name;
        return displayText === inputVal || inputVal.startsWith(a.nr + ' –') || inputVal === a.nr;
      });
      
      if (match) {
        document.getElementById('d-th').value = match.thickness || 0;
        document.getElementById('d-th').dataset.stddev = match.thickness_stddev || 0;
        
        if (match.area_weight && match.area_weight > 0) {
          document.getElementById('d-aw').value = match.area_weight;
          document.getElementById('d-aw').dataset.stddev = match.area_weight_stddev || 0;
        }
        
        const extractedWidth = extractWidthFromName(match.name);
        if (extractedWidth > 0) {
          document.getElementById('de-wi').value = extractedWidth;
        }
        
        setTimeout(function() {
          triggerAutoWeightCalculation();
        }, 100);
      }
    });
  }
  
  document.querySelectorAll('.core-preset-btn').forEach(function(btn) {
    btn.addEventListener('click', function() {
      const coreVal = btn.dataset.core;
      const pane = btn.closest('.tab-pane');
      if (pane) {
        const inp = pane.querySelector('input[id$="-co"]');
        if (inp) {
          inp.value = coreVal;
          pane.querySelectorAll('.core-preset-btn').forEach(function(b) { b.classList.remove('active'); });
          btn.classList.add('active');
        }
      }
    });
  });
}

function extractWidthFromName(productName) {
  if (!productName) return 0;
  const match = productName.match(/(\d+[,\.]\d+)\s*x\s*\d+\s*m/i);
  if (match && match[1]) {
    const widthStr = match[1].replace(',', '.');
    const width = parseFloat(widthStr);
    if (width > 0 && width < 100) return width;
  }
  return 0;
}

function triggerAutoWeightCalculation() {
  const wiEl = document.getElementById('de-wi');
  const awEl = document.getElementById('d-aw');
  const LEL = document.getElementById('d-le');
  const resultEl = document.getElementById('d-wo');
  
  if (!wiEl || !awEl || !LEL || !resultEl) return;
  
  const wi = parseFloat(wiEl.value) || 0;
  const aw = parseFloat(awEl.value) || 0;
  const L = parseFloat(LEL.value) || 0;
  
  if (wi > 0 && aw > 0 && L > 0) {
    const weight = (aw * L * wi / 1000).toFixed(1);
    resultEl.value = weight;
    console.log('[AutoCalc] Weight: ' + weight + ' kg');
    return true;
  }
  return false;
}

function setupWeightCalculationListeners() {
  const inputIds = ['de-wi', 'd-aw', 'd-le'];
  inputIds.forEach(function(id) {
    const el = document.getElementById(id);
    if (el) {
      el.addEventListener('change', triggerAutoWeightCalculation);
      el.addEventListener('blur', triggerAutoWeightCalculation);
    }
  });
}

window.RollCalcV14 = {
  populateArticleDropdowns_v14: populateArticleDropdowns_v14,
  triggerAutoWeightCalculation: triggerAutoWeightCalculation,
  extractWidthFromName: extractWidthFromName
};

document.addEventListener('DOMContentLoaded', function() {
  if (window.ARTICLE_DATA && window.ARTICLE_DATA.length > 0) {
    populateArticleDropdowns_v14();
    setupWeightCalculationListeners();
  }
});