const fs = require('fs');
const path = require('path');

// For Node.js environments that support TextDecoder
// Using iconv-lite or manual Shift-JIS decoding
const sjis = require('encoding');

const csvDir = './MoneyForwardエクスポート';

const files = fs.readdirSync(csvDir).filter(f => f.endsWith('.csv'));

const categories = new Map(); // key: "大項目|中項目", value: {institutions: Set, hasNonTransfer: boolean}
const institutions = new Set();

files.forEach(file => {
  const filePath = path.join(csvDir, file);
  const buffer = fs.readFileSync(filePath);
  
  // Try to decode from Shift-JIS
  let content;
  try {
    // Using Node.js built-in Buffer (assumes UTF-8, may fail)
    content = buffer.toString('utf8');
  } catch (e) {
    console.error(`Could not decode file: ${file}`);
    return;
  }
  
  const lines = content.split('\n');
  
  // Parse header
  const headerLine = lines[0];
  const headers = headerLine.split(',');
  
  const indices = {
    大項目: headers.indexOf('大項目'),
    中項目: headers.indexOf('中項目'),
    保有金融機関: headers.indexOf('保有金融機関'),
    振替: headers.indexOf('振替')
  };
  
  console.log(`File: ${file}`);
  console.log(`Headers found:`, indices);
  
  // Parse data rows
  for (let i = 1; i < lines.length; i++) {
    const line = lines[i].trim();
    if (!line) continue;
    
    const fields = line.split(',');
    if (fields.length < Math.max(...Object.values(indices)) + 1) continue;
    
    const category = fields[indices.大項目];
    const subCategory = fields[indices.中項目];
    const institution = fields[indices.保有金融機関];
    const transfer = fields[indices.振替];
    
    if (!category || !subCategory) continue;
    
    const key = `${category}|${subCategory}`;
    
    if (!categories.has(key)) {
      categories.set(key, { institutions: new Set(), hasNonTransfer: false });
    }
    
    categories.get(key).institutions.add(institution);
    if (transfer === '0') {
      categories.get(key).hasNonTransfer = true;
    }
    
    institutions.add(institution);
  }
});

console.log('\n=== UNIQUE CATEGORIES ===\n');
console.log('大項目 | 中項目 | Institutions | Has Non-Transfer');
console.log('-'.repeat(80));

const sortedCategories = Array.from(categories.entries()).sort();
sortedCategories.forEach(([key, data]) => {
  const [大項目, 中項目] = key.split('|');
  const instList = Array.from(data.institutions).join('; ');
  console.log(`${大項目} | ${中項目} | ${instList} | ${data.hasNonTransfer ? 'Yes' : 'No'}`);
});

console.log('\n=== INSTITUTIONS ===\n');
Array.from(institutions).sort().forEach(inst => console.log(inst));