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package com.cybersource.authsdk.payloaddigest;

import java.security.MessageDigest;
import java.util.Base64;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.cybersource.authsdk.core.MerchantConfig;
import com.cybersource.authsdk.util.GlobalLabelParameters;

public class PayloadDigest {
	private static Logger logger = LogManager.getLogger(PayloadDigest.class);

	private String bluePrint = null, messageBody = null;
	private MerchantConfig merchantConfig = null;
	private String sha256 = GlobalLabelParameters.SHA_256;

	/**
	 * @param merchantConfig - contains all information for merchant
	 */
	public PayloadDigest(MerchantConfig merchantConfig) {
		this.merchantConfig = merchantConfig;
	}

	/**
	 * @return generated digest from requestBody
	 */
	private String digestGeneration() {

		/*
		 * This method return Digest value which is SHA-256 hash of payload that is
		 * BASE64 encoded
		 */
		String messageBody = payloadGeneration();
		MessageDigest digestString;
		byte[] digestBytes = null;
		try {
			digestString = MessageDigest.getInstance(sha256);
			digestBytes = digestString.digest(messageBody.getBytes("UTF-8"));
		} catch (Exception e) {
			logger.fatal(GlobalLabelParameters.DIGEST_GEN_FAILED);
			logger.error(e);
			return null;
		}
		bluePrint = Base64.getEncoder().encodeToString(digestBytes);
		bluePrint = sha256 + "=" + bluePrint;
		return bluePrint;
	}

	/**
	 * Reads the Payload data present in the request json file, if present, else
	 * reads form the merchant config object.
	 * 
	 * @return generated payLoad from request body.
	 */
	private String payloadGeneration() {
		messageBody = merchantConfig.getRequestData();
		return messageBody;
	}

	/**
	 * @return payLoad generated.
	 */
	public String getPayLoad() {
		payloadGeneration();
		return messageBody;
	}

	/**
	 * @return Digest generated from payload.
	 */
	public String getDigest() {
		digestGeneration();
		return bluePrint;
	}

	/**
	 * @return messageBody for request.
	 */
	public String getMessageBody() {
		return messageBody;
	}
}