/*
    Copyright 2014 LinkedIn Corp.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

package com.linkedin.platform;

import android.util.Log;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.Serializable;

public class AccessToken implements Serializable {

    private static final String ACCESS_TOKEN_VALUE = "accessTokenValue";
    private static final String EXPIRES_ON = "expiresOn";
    private static final String TAG = AccessToken.class.getSimpleName();

    private final String accessTokenValue;
    private final long expiresOn;

    /**
     * build an accessToken from a previously retrieved value
     * @param accessToken obtained by calling {@link AccessToken#toString()}
     * @return
     */
    public synchronized static AccessToken buildAccessToken(String accessToken) {
        if (accessToken == null || "".equals(accessToken)) {
            return null;
        }
        try {
            JSONObject jsonObject = new JSONObject(accessToken);
            return new AccessToken(jsonObject);
        } catch (JSONException e) {
            Log.d(TAG, e.getMessage());
            return null;
        }
    }

    public synchronized static AccessToken buildAccessToken(JSONObject accessToken) {
        if (accessToken == null) {
            return null;
        }
        try {
            return new AccessToken(accessToken);
        } catch (JSONException e) {
            Log.d(TAG, e.getMessage());
            return null;
        }
    }

    private AccessToken(JSONObject accessTokenJson) throws JSONException {
        accessTokenValue = accessTokenJson.getString(ACCESS_TOKEN_VALUE);
        expiresOn = accessTokenJson.getLong(EXPIRES_ON);
    }

    public AccessToken(String accessTokenValue, long expiresOn) {
        this.accessTokenValue = accessTokenValue;
        this.expiresOn = expiresOn;
    }

    public String getValue() {
        return accessTokenValue;
    }

    /**
     * @return the time when this AccessToken expires
     */
    public long getExpiresOn() {
        return expiresOn;
    }

    /**
     * @return true if access token is expired; false otherwise
     */
    public boolean isExpired() {
        return  System.currentTimeMillis() > getExpiresOn();
    }

    @Override
    public String toString() {
        try {
            JSONObject json = new JSONObject();
            json.put(ACCESS_TOKEN_VALUE, accessTokenValue);
            json.put(EXPIRES_ON, expiresOn);
            return json.toString();
        } catch (JSONException e) {
        }
        return null;
    }
}