#!/usr/bin/env node
/**
 * postinstall.js - Aplica patches de compatibilidade no node-firebird
 * após npm install, garantindo compatibilidade com Node.js 22+.
 */
const fs = require('fs');
const path = require('path');

const connPath = path.resolve(__dirname, '../node_modules/node-firebird/lib/wire/connection.js');

if (!fs.existsSync(connPath)) {
  console.log('[patch] connection.js not found, skipping');
  process.exit(0);
}

let content = fs.readFileSync(connPath, 'utf8');
let patched = false;

// ============================================================
// Patch 1: SRP empty buffer (Firebird 3.0 Legacy_Auth)
// ============================================================
const srpOld = (
  '                            // TODO : Fallback Srp256 to Srp ?\n' +
  '                            /*if (!d.buffer) {\n' +
  '                                cnx.sendOpContAuth(\n' +
  '                                    cnx.clientKeys.public.toString(16),\n' +
  '                                    DEFAULT_ENCODING,\n' +
  '                                    accept.pluginName\n' +
  '                                );\n' +
  '\n' +
  '                                return cb(new Error(\'login\'));\n' +
  '                            }*/\n' +
  '\n' +
  '                            // Check buffer contains salt\n' +
  '                            var saltLen = d.buffer.readUInt16LE(0);'
);

const srpNew = (
  '                            // No auth data from server - server accepted the connection\n' +
  '                            // without requiring SRP. This happens with Firebird 3.0 when\n' +
  '                            // the server already validated the client.\n' +
  '                            if (!d || !d.buffer) {\n' +
  "                                accept.authData = '';\n" +
  "                                accept.sessionKey = '';\n" +
  '                            } else {\n' +
  '                                // Check buffer contains salt\n' +
  '                                var saltLen = d.buffer.readUInt16LE(0);'
);

if (content.includes(srpOld)) {
  content = content.replace(srpOld, srpNew);
  patched = true;
  console.log('[patch] Patch 1 (SRP) applied');
}

// ============================================================
// Patch 2: Missing closing brace (Node.js 22+ syntax)
// ============================================================
const syntaxOld = (
  '                            accept.authData = proof.authData.toString(16);\n' +
  '                            accept.sessionKey = proof.clientSessionKey;\n' +
  '                        } else if (accept.pluginName === Const.AUTH_PLUGIN_LEGACY) {'
);

const syntaxNew = (
  '                            accept.authData = proof.authData.toString(16);\n' +
  '                            accept.sessionKey = proof.clientSessionKey;\n' +
  '                            } // fecha o else do if (!d || !d.buffer)\n' +
  '                        } else if (accept.pluginName === Const.AUTH_PLUGIN_LEGACY) {'
);

if (content.includes(syntaxOld)) {
  content = content.replace(syntaxOld, syntaxNew);
  patched = true;
  console.log('[patch] Patch 2 (syntax Node22) applied');
}

if (patched) {
  fs.writeFileSync(connPath, content, 'utf8');
  console.log('[patch] node-firebird patched successfully');
} else {
  console.log('[patch] node-firebird already patched or not needed');
}