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package in.s8.rsa.controller;

import in.s8.rsa.Service.DecryptionService;
import in.s8.rsa.constant.S8Constant;
import in.s8.rsa.impl.DecryptImpl;
import in.s8.rsa.implService.DecryptService;
import org.springframework.stereotype.Component;

import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.xml.bind.DatatypeConverter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.ObjectInputStream;
import java.security.InvalidKeyException;
import java.security.PrivateKey;

/**
 * Utility to decrypt the Data.
 * Created by Sourabh_Sethi on 4/26/2016.
 *
 * @Author - Sourabh Sethi
 */

@Component("decryptionService")
public class DecryptController implements DecryptionService {

    DecryptService decryptService = new DecryptImpl();

    public String decryption(String encryptedTxt) {

        ObjectInputStream inputStream = null;
        String plainText = null;

        try {

            inputStream = new ObjectInputStream(new FileInputStream(S8Constant.PRIVATE_KEY_FILE));

            final PrivateKey privateKey = (PrivateKey) inputStream.readObject();
            String cipherText = encryptedTxt;

            plainText = decryptService.decrypt(DatatypeConverter.parseHexBinary(cipherText), privateKey);
        } catch (FileNotFoundException e) {

            System.out.println("Please check the public key and Private Key Path");
            System.out.println("Path Should be ./private.key");

        } catch (Exception e) {
            e.printStackTrace();

        }

        return plainText;

    }

    @Deprecated
    public String decryptionSetup(String encryptedTxt, String privateKeyLocation) {

        ObjectInputStream inputStream = null;
        String plainText = null;

        try {

            inputStream = new ObjectInputStream(new FileInputStream(privateKeyLocation));

            final PrivateKey privateKey = (PrivateKey) inputStream.readObject();
            String cipherText = encryptedTxt;

            plainText = decryptService.decrypt(DatatypeConverter.parseHexBinary(cipherText), privateKey);
        } catch (FileNotFoundException e) {

            System.out.println("Please check the public key and Private Key Path");
            System.out.println("please provide the private key path");

        } catch (Exception e) {
            e.printStackTrace();

        }

        return plainText;

    }

    /**
     * @param encryptedString
     * @param privateKey
     * @return decrypted String.
     * @desc Decryption Service - used to Decrypted the string
     */
    public String decryption(String encryptedString, PrivateKey privateKey) throws NoSuchPaddingException, BadPaddingException {

        String plainText = null;
        try {

            plainText = decryptService.decrypt(DatatypeConverter.parseHexBinary(encryptedString), privateKey);

        } catch (NoSuchPaddingException e) {

            System.out.println("No such  Padding !! Warning Please check the It may be Malicious Attempt to decrypt");
            System.out.println("or please provide valid private key");

        } catch (BadPaddingException e) {

            System.out.println("Incorrect Padding !! Warning Please check the It may be Malicious Attempt to decrypt");
            System.out.println("or please provide valid private key");

        } catch (InvalidKeyException e) {

            System.out.println("or please provide valid private key");

        } catch (IllegalBlockSizeException e) {

            System.out.println("Please check the block Size of Encrypted String and provided private Key");

        } catch (Exception e) {
            e.printStackTrace();
        }
        return plainText;
    }


}