const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const EXCEL_SOURCE_FILES = [
  path.join(process.cwd(), 'data/source/high-voltage.xlsx'),
  path.join(process.cwd(), 'data/source/medium-voltage-KM.xlsx'),
  path.join(process.cwd(), 'data/source/low-voltage-KM.xlsx'),
  path.join(process.cwd(), 'data/source/solar-cables.xlsx'),
];

function normalizeExcelKey(value) {
  return String(value || '')
    .toUpperCase()
    .replace(/-\d+$/g, '')
    .replace(/[^A-Z0-9]+/g, '');
}

function loadExcelRows(filePath) {
  const out = execSync(`npx -y xlsx-cli -j "${filePath}"`, { encoding: 'utf8', stdio: ['ignore', 'pipe', 'ignore'] });
  const trimmed = out.trim();
  const jsonStart = trimmed.indexOf('[');
  if (jsonStart < 0) return [];
  const jsonText = trimmed.slice(jsonStart);
  try {
    return JSON.parse(jsonText);
  } catch {
    return [];
  }
}

function getExcelIndex() {
  const idx = new Map();
  for (const file of EXCEL_SOURCE_FILES) {
    if (!fs.existsSync(file)) continue;
    const rows = loadExcelRows(file);
    console.log(`[excel] loaded ${rows.length} rows from ${path.relative(process.cwd(), file)}`);

    const unitsRow = rows.find(r => r && r['Part Number'] === 'Units') || null;
    const units = {};
    if (unitsRow) {
      for (const [k, v] of Object.entries(unitsRow)) {
        if (k === 'Part Number') continue;
        const unit = String(v ?? '').trim();
        if (unit) units[k] = unit;
      }
    }

    for (const r of rows) {
      const pn = r?.['Part Number'];
      if (!pn || pn === 'Units') continue;
      const key = normalizeExcelKey(String(pn));
      if (!key) continue;
      const cur = idx.get(key);
      if (!cur) {
        idx.set(key, { rows: [r], units });
      } else {
        cur.rows.push(r);
        if (Object.keys(cur.units).length < Object.keys(units).length) cur.units = units;
      }
    }
  }
  return idx;
}

const idx = getExcelIndex();
console.log('\n=== Excel Index Keys ===');
for (const [key, match] of idx.entries()) {
  console.log(`Key: ${key} | Rows: ${match.rows.length}`);
  if (match.rows.length > 0) {
    console.log('  Sample columns:', Object.keys(match.rows[0]).slice(0, 10).join(', '));
  }
}

// Test specific products
const products = JSON.parse(fs.readFileSync('data/processed/products.json', 'utf8'));
const testProducts = ['na2xsfl2y-3', 'h1z2z2-k', 'na2xsfl2y', 'h1z2z2k'];

console.log('\n=== Product Lookup Tests ===');
testProducts.forEach(slug => {
  const product = products.find(p => p.slug === slug);
  if (product) {
    const candidates = [
      product.name,
      product.slug ? product.slug.replace(/-\d+$/g, '') : '',
      product.sku,
      product.translationKey,
    ].filter(Boolean);
    
    const keys = candidates.map(c => normalizeExcelKey(c));
    const matches = keys.map(k => idx.get(k)).filter(Boolean);
    
    console.log(`\nProduct: ${slug} (${product.name})`);
    console.log(`  Candidates: ${candidates.join(', ')}`);
    console.log(`  Keys: ${keys.join(', ')}`);
    console.log(`  Excel matches: ${matches.length}`);
    if (matches.length > 0) {
      console.log(`  Rows found: ${matches[0].rows.length}`);
    }
  }
});