var ursa = require('ursa');
var fs = require('fs');

var DecryptServ = {};

DecryptServ.decrypter = false;

DecryptServ.whenOk = function (cb) {
    if (this.encrypter) {
        cb();
    } else {
        this.prepare(cb);
    }
};

DecryptServ.prepare = function (cb) {
    fs.readFile('config/ci_com.pem', function (err, data) {
        if (err) {
            throw err;
        }
        this.decrypter = ursa.createPrivateKey(data);
        cb();
    });
};

DecryptServ.preload = function (cb) {
    this.whenOk(cb);
};

DecryptServ.decrypt = function (string, cb) {
    this.whenOk(function () {
        cb(this.decrypter.decrypt(string, 'base64', 'utf8', ursa.RSA_PKCS1_PADDING));
    });
};

module.exports = DecryptServ;