// Add observational hooks to the verified S28 routing layout, without replacing routing or billing.
import { readFileSync, writeFileSync } from 'node:fs';
const [source, output] = process.argv.slice(2);
if (!source || !output) throw new Error('Usage: node instrument-caller-analytics.mjs source.cfg output.cfg');
let cfg = readFileSync(source, 'utf8').replaceAll('\r\n', '\n').replace(/^\uFEFF/, '');
if (cfg.includes('CRA_INSTRUMENTATION_VERSION=2')) throw new Error('Already instrumented at version 2');
function insert(marker, extra, after = false) {
  if (cfg.split(marker).length !== 2) throw new Error(`Unsupported routing layout: ${marker}`);
  cfg = cfg.replace(marker, after ? marker + extra : extra + marker);
}
const versionMarker = '# CRA_INSTRUMENTATION_VERSION=2\n';
const registerStats = () => insert('modparam("statistics", "variable", "s28_cdr_xadd_error_total/no_reset")', '\nmodparam("statistics", "variable", "cra_event_total/no_reset")', true);
const ackHook = `        if (is_method("ACK")) {\n            $var(cra_kind)="TALK_START"; $var(cra_code)=200; $var(cra_source)="dialog-acked"; route(CRA_EMIT_DLG);\n        }\n`;
if (cfg.includes('CRA1|')) {
  registerStats();
  insert('    if (has_totag()) {\n', ackHook, true);
  cfg = cfg
    .replace('$var(cra_kind)="END"; $var(cra_code)=$var(s28_reply_code); $var(cra_source)="platform-final"; route(CRA_EMIT_AVP);', '$var(cra_kind)="END"; $var(cra_code)=$var(s28_reply_code); $var(cra_source)="platform-final"; route(CRA_EMIT_AVP);\n    $var(cra_kind)="CLOSE"; $var(cra_source)="platform-closed"; route(CRA_EMIT_AVP);')
    .replace('$var(cra_kind)="END"; $var(cra_code)=200; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);', '$var(cra_kind)="END"; $var(cra_code)=200; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);\n    $var(cra_kind)="CLOSE"; $var(cra_source)="dialog-closed"; route(CRA_EMIT_DLG);')
    .replace('$var(cra_kind)="END"; $var(cra_code)=408; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);', '$var(cra_kind)="END"; $var(cra_code)=408; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);\n    $var(cra_kind)="CLOSE"; $var(cra_source)="dialog-timeout"; route(CRA_EMIT_DLG);')
    .replace('$var(cra_kind)="END"; $var(cra_code)=$T_reply_code; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);', '$var(cra_kind)="END"; $var(cra_code)=$T_reply_code; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);\n    $var(cra_kind)="CLOSE"; $var(cra_source)="attempts-exhausted"; route(CRA_EMIT_DLG);')
    .replaceAll('xlog("L_NOTICE", "CRA1|', 'update_stat("cra_event_total", 1);\n    xlog("L_NOTICE", "CRA1|');
  writeFileSync(output, versionMarker + cfg, 'utf8');
  console.log('Analytics observation hooks upgraded to version 2; OpenSIPS config validation is required before activation.');
  process.exit(0);
}
registerStats();
insert('    if (has_totag()) {\n', ackHook, true);
const metadata = {
  uid: '$ci + "~" + $ft + "~" + $TS', callid: '$ci', customer: '$var(s28_customer_id)',
  gateway: '$var(s28_gateway_id)', vendor: '$var(s28_vendor_id)', vendorGateway: '$var(s28_vendor_gateway_id)',
  caller: '$fU', landing: '$var(s28_landing_caller)', callee: '$var(s28_real_callee)',
  city: '$var(s28_callee_city_code)', carrier: '$var(s28_callee_operator)', startsec: '$Ts', startmicro: '$Tsm', attempt: '"none"'
};
const init = Object.entries(metadata).map(([k,v]) => `    $avp(cra_${k}) = ${v};`).join('\n');
insert('    if ($var(s28_decision) != "allow") {', `${init}\n    $var(cra_kind)="START"; $var(cra_code)=0; $var(cra_source)="opensips"; route(CRA_EMIT_AVP);\n\n`);
const bind = Object.keys(metadata).map(k => `    $dlg_val(cra_${k}) = $avp(cra_${k});`).join('\n');
insert('    $dlg_val(s28_customer_id) = $var(s28_customer_id);', `${bind}\n    dlg_on_hangup("CRA_HANGUP");\n    dlg_on_timeout("CRA_TIMEOUT");\n`);
insert('    t_on_reply("S28_REPLY");', '    $dlg_val(cra_attempt)="1"; $avp(cra_attempt)="1";\n    $var(cra_kind)="ATTEMPT"; $var(cra_code)=0; $var(cra_source)="opensips"; route(CRA_EMIT_DLG);\n    t_on_failure("CRA_FAILURE");\n');
insert('onreply_route[S28_REPLY] {', '\n    if ($rs==180 || $rs==183 || $rs==100 || $rs==181 || $rs==182) {\n        $var(cra_kind)="PROGRESS"; $var(cra_code)=$rs; $var(cra_source)="opensips"; route(CRA_EMIT_DLG);\n    }\n    if ($rs>=200 && $rs<300) {\n        $var(cra_kind)="ACCEPTED"; $var(cra_code)=$rs; $var(cra_source)="opensips"; route(CRA_EMIT_DLG);\n    }\n', true);
insert('route[S28_CDR_FAILURE] {', '\n    $var(cra_kind)="END"; $var(cra_code)=$var(s28_reply_code); $var(cra_source)="platform-final"; route(CRA_EMIT_AVP);\n    $var(cra_kind)="CLOSE"; $var(cra_source)="platform-closed"; route(CRA_EMIT_AVP);\n', true);
const fields = ['uid', 'callid', 'customer', 'gateway', 'vendor', 'vendorGateway', 'caller', 'landing', 'callee', 'city', 'carrier', 'attempt'];
function emitter(type, prefix) {
  const ref = k => `$${prefix}(cra_${k})`;
  const encoded = fields.map(k => `$(${prefix}(cra_${k}){s.b64encode})`).join('|');
  return `\nroute[CRA_EMIT_${type}] {\n    if (${ref('customer')}==NULL || ${ref('customer')}=="none") return;\n    update_stat("cra_event_total", 1);\n    xlog("L_NOTICE", "CRA1|$var(cra_kind)|$Ts|$Tsm|${ref('startsec')}|${ref('startmicro')}|$var(cra_code)|$var(cra_source)|${encoded}\\n");\n}\n`;
}
cfg += emitter('AVP', 'avp') + emitter('DLG', 'dlg_val') + `
route[CRA_HANGUP] {
    $var(cra_kind)="END"; $var(cra_code)=200; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);
    $var(cra_kind)="CLOSE"; $var(cra_source)="dialog-closed"; route(CRA_EMIT_DLG);
}
route[CRA_TIMEOUT] {
    $var(cra_kind)="END"; $var(cra_code)=408; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);
    $var(cra_kind)="CLOSE"; $var(cra_source)="dialog-timeout"; route(CRA_EMIT_DLG);
}
failure_route[CRA_FAILURE] {
    $var(cra_kind)="END"; $var(cra_code)=$T_reply_code; $var(cra_source)="verified-dialog-final"; route(CRA_EMIT_DLG);
    $var(cra_kind)="CLOSE"; $var(cra_source)="attempts-exhausted"; route(CRA_EMIT_DLG);
}
`;
writeFileSync(output, versionMarker + cfg, 'utf8');
console.log('Analytics observation hooks generated; OpenSIPS config validation is required before activation.');