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

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

  // Try RSA Private and Public keys
  if (!ec) {
    if (!pub) {
      try {
        return RSA.parsePkcs8(der);
      } catch(e) {
        try {
          return RSA.parsePkcs1(der);
        } catch(e) {
          // ignore
        }
      }
    }
    if (!prv) {
      try {
        return RSA.parseSpki(der);
      } catch(e) {
        try {
          return RSA.parsePublicPkcs1(der);
        } catch(e) {
          // ignore
        }
      }
    }
  }
  throw new Error("doesn't appear to be a valid key file. Tried PKCS1, SEC1, PKCS8, and SPKI/PKIX");
};