'use strict';

var x509 = module.exports;

var PEM = require('./pem-parser.js');
var EC = require('./x509-ec-parser.js');
var RSA = require('./x509-rsa-parser.js');

x509.parse = function (opts) {
  var pem = opts.pem;
  var der = opts.der;
  if ('string' === opts.key) {
    pem = opts.key;
  } else if (opts.key && opts.key.length) {
    der = opts.key;
  }
  if (pem) { pem = PEM.parseBlock(pem); }
  else { pem = { bytes: der, type: '' }; }
  der = pem.bytes;
  var typ = pem.type;
  var pub = /PUBLIC KEY/.test(typ);
  var prv = /PRIVATE KEY/.test(typ);
  var ec = /EC P/.test(typ);
  var rsa = /RSA P/.test(typ);

  // Try EC Private and Public keys
  if (!rsa && !pub) {
    try { return EC.parsePkcs8(der); } catch(e) { /*ignore*/ }
    try { return EC.parseSec1(der); } catch(e) { /*ignore*/ }
  } else if (!rsa && !prv) {
    try { return EC.parseSpki(der); } catch(e) { /*ignore*/ }
  }

  // Try RSA Private and Public keys
  if (!ec && !pub) {
    try { return RSA.parsePkcs8(der); } catch(e) { /*ignore*/ }
    try { return RSA.parsePkcs1(der); } catch(e) { /*ignore*/ }
  } else if (!ec && !prv) {
    try { return RSA.parseSpki(der); } catch(e) { /*ignore*/ }
    try { return RSA.parsePublicPkcs1(der); } catch(e) { /*ignore*/ }
  }

  throw new Error("Invalid or Unsupported key:\n"
    + "Tried ASN.1 PEM/DER PKCS1, SEC1, PKCS8, and SPKI/PKIX (RSA and EC Private and Public)");
};