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

const ROOT = path.join(__dirname, '..');

function readLogicSource(fileName) {
  const raw = fs.readFileSync(path.join(ROOT, 'logic', fileName), 'utf8');
  return raw
    // Remove a linha final "module.exports = {...}" -- as funcoes ficam soltas no escopo do node.
    .replace(/module\.exports\s*=\s*\{[\s\S]*?\};?\s*$/m, '')
    // Remove requires de outros modulos de logic/*.js -- quando inlined, a funcao requerida
    // ja esta no mesmo escopo (senao vira identificador duplicado: function X + const {X} = require(...)).
    .replace(/^const\s*\{[^}]*\}\s*=\s*require\(['"]\.\/[a-zA-Z0-9_-]+['"]\);?\s*$/gm, '')
    .trim();
}

function inlinedLogic(fileNames) {
  return fileNames.map(readLogicSource).join('\n\n');
}

function sqlAsJsTemplateLiteral(sqlRelativePath) {
  const sql = fs.readFileSync(path.join(ROOT, sqlRelativePath), 'utf8');
  const escaped = sql.replace(/\\/g, '\\\\').replace(/`/g, '\\`').replace(/\$\{/g, '\\${');
  return `\`${escaped}\``;
}

function buildDriverCode(driverRelativePath) {
  const driverPath = path.join(ROOT, 'n8n', 'nodes', driverRelativePath);
  let driver = fs.readFileSync(driverPath, 'utf8');

  const requiresMatch = driver.match(/^\/\/ @requires (.+)$/m);
  const requiredLogicFiles = requiresMatch ? requiresMatch[1].trim().split(/\s+/) : [];
  driver = driver.replace(/^\/\/ @requires .+\n/m, '');

  driver = driver.replace('/* __SQL_CANDIDATOS_V2__ */', sqlAsJsTemplateLiteral('sql/candidatos_v2_glpi.sql'));
  driver = driver.replace('/* __SQL_LEGADO_V1_VERBATIM__ */', sqlAsJsTemplateLiteral('sql/top_10_chamados_abertos_glpi.sql'));
  driver = driver.replace('/* __SQL_CONTEXTO__ */', sqlAsJsTemplateLiteral('sql/contexto_glpi.sql'));

  const logicBlock = requiredLogicFiles.length ? `${inlinedLogic(requiredLogicFiles)}\n\n` : '';
  return `${logicBlock}${driver.trim()}`;
}

function buildWorkflow() {
  const templatePath = path.join(ROOT, 'n8n', 'workflow.template.json');
  const template = JSON.parse(fs.readFileSync(templatePath, 'utf8'));

  for (const node of template.nodes) {
    if (node.type === 'n8n-nodes-base.code' && typeof node.parameters.jsCode === 'string') {
      const marker = node.parameters.jsCode.match(/^__BUILD__:(.+)$/);
      if (marker) {
        node.parameters.jsCode = buildDriverCode(marker[1].trim());
      }
    }
  }

  return template;
}

if (require.main === module) {
  process.stdout.write(JSON.stringify(buildWorkflow(), null, 2));
}

module.exports = { buildWorkflow, inlinedLogic, readLogicSource, sqlAsJsTemplateLiteral, buildDriverCode };