import { pool } from '../services/db.service';
import { resolve } from 'node:path';

/**
 * Genera el esquema de la base de datos automáticamente
 */
async function generateSchema() {
  try {
    const rows = await pool.query(`
      SELECT 
        TABLE_NAME as t, 
        COLUMN_NAME as f, 
        DATA_TYPE as T, 
        COLUMN_TYPE as fT, 
        EXTRA as e, 
        COLUMN_KEY as k 
      FROM information_schema.columns 
      WHERE table_schema = DATABASE() 
      ORDER BY TABLE_NAME, ORDINAL_POSITION
    `);

    const data = rows.reduce((acc, { t, f, T, fT, e, k }) => {
      if (!acc[t]) acc[t] = {};

      // Mapeo de tipos
      let type = 'text';
      
      if (['int', 'decimal', 'float', 'double'].includes(T)) {
        type = 'numeric';
      } else if (['date', 'datetime', 'timestamp'].includes(T)) {
        type = T === 'date' ? 'date' : 'datetime';
      } else if (T === 'tinyint' && fT.includes('(1)')) {
        type = 'boolean';
      } else if (T === 'enum') {
        type = 'select'; 
      }

      const hide = f.startsWith('id') || f === 'password' || f === 'token';
      const virt = e.toLowerCase().includes('generated');
      const key = k === 'PRI' ? 'PK' : k === 'UNI' ? 'UK' : k === 'MUL' ? 'FK' : false;

      acc[t][f] = { 
        field: f, 
        header: f.replace(/_/g, ' ').toUpperCase(), 
        type, 
        hide, 
        virt, 
        key, 
        editable: !(hide || key === 'PK' || virt) 
      };

      return acc;
    }, {});

    const outPath = resolve('./server/lib/schema.json');

    // JSON compacto para ahorrar bytes pero manteniendo legibilidad por tabla
    const json = JSON.stringify(data, null, 2)
      .replace(/\{\n\s+"field":[\s\S]+?\n\s+\}/g, m => m.replace(/\s*\n\s*/g, ' '));

    await Bun.write(outPath, json);

    console.log(`✅ Esquema generado: ${outPath}`);
    console.log(`📊 Tablas: ${Object.keys(data).length}`);

  } catch (error) {
    console.error('❌ Error:', error);
  } finally {
    await pool.end();
    process.exit(0);
  }
}

generateSchema();