package com.omniture.android.dashboard.viewer.model.user;

import java.io.UnsupportedEncodingException;
import java.security.NoSuchAlgorithmException;

import com.omniture.android.dashboard.viewer.utilities.Base64Coder;
import com.omniture.android.dashboard.viewer.utilities.ISOUtilities;
import com.omniture.android.dashboard.viewer.utilities.SimpleMD5;
import com.omniture.android.dashboard.viewer.utilities.SimpleSHA1;

public class AuthHelper {

  String mUser_login;
	String mCompany;
	String mHashed_password;
	String mApp_key;
	String mApp_shared_secret;
	OMUser mUser;

	public AuthHelper(OMUser user, String mUserLogin, String mCompany, String mHashedPassword, String mAppKey, String mAppSharedSecret) {
		super();
		this.mUser = user;
		this.mUser_login = mUserLogin;
		this.mCompany = mCompany;
		this.mHashed_password = mHashedPassword;
		this.mApp_key = mAppKey;
		this.mApp_shared_secret = mAppSharedSecret;
	}

	// creates and fills an authParams object with one time use properties.
	public AuthParams getOneTimeAuthParams() {
		AuthParams auth_params = new AuthParams();

		String nonce = generateNonce();
		String appnonce = generateNonce();

		try {
			String timestamp = ISOUtilities.formatDateTime();
			String tempDigest = nonce + timestamp + mHashed_password;
			String tempDigestSHA1 = SimpleSHA1.SHA1Hex(tempDigest);
			String tempAppDigest = appnonce + mApp_shared_secret;
			String tempAppDigestSHA1 = SimpleSHA1.SHA1Hex(tempAppDigest);

			auth_params.setmAuth_username(mUser_login + ":" + mCompany);
			auth_params.setmAuth_nonce(nonce);
			auth_params.setmAuth_created(timestamp);
			auth_params.setmAuth_digest(Base64Coder.encodeString(tempDigestSHA1));
			auth_params.setmAppdigest(Base64Coder.encodeString(tempAppDigestSHA1));
			auth_params.setmAppnonce(appnonce);
			auth_params.setmAppkey(mApp_key);
		} catch (NoSuchAlgorithmException ne) {
			ne.printStackTrace();
			return null;
		} catch (UnsupportedEncodingException uce) {
			uce.printStackTrace();
			return null;
		}

		return auth_params;
	}

	// Generates a unique hash based on epoch date.
	public String generateNonce() {
		String nonce = ISOUtilities.milliDateTime();

		try{
			nonce = SimpleMD5.MD5(nonce);
			return nonce;
		} catch (NoSuchAlgorithmException ne) {
			ne.printStackTrace();
			return null;
		} catch (UnsupportedEncodingException uce) {
			uce.printStackTrace();
			return null;
		}
	}

}