/*
 * Copyright 2007 Netflix, Inc.
 *
 * 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 net.oauth;

import java.util.HashMap;
import java.util.Map;
import net.oauth.http.HttpMessage;
import net.oauth.http.HttpResponseMessage;

/**
 * Describes an OAuth-related problem, using a set of named parameters. One
 * parameter identifies the basic problem, and the others provide supplementary
 * diagnostic information. This can be used to capture information from a
 * response that conforms to the OAuth <a
 * href="http://wiki.oauth.net/ProblemReporting">Problem Reporting
 * extension</a>.
 * 
 * @author John Kristian
 * @hide
 */
public class OAuthProblemException extends OAuthException {

    public static final String OAUTH_PROBLEM = "oauth_problem";

    public OAuthProblemException() {
    }

    public OAuthProblemException(String problem) {
        super(problem);
        if (problem != null) {
            parameters.put(OAUTH_PROBLEM, problem);
        }
    }

    private final Map<String, Object> parameters = new HashMap<String, Object>();

    @Override
    public String getMessage() {
        String msg = super.getMessage();
        if (msg != null)
            return msg;
        msg = getProblem();
        if (msg != null)
            return msg;
        Object response = getParameters().get(HttpMessage.RESPONSE);
        if (response != null) {
            msg = response.toString();
            int eol = msg.indexOf("\n");
            if (eol < 0) {
                eol = msg.indexOf("\r");
            }
            if (eol >= 0) {
                msg = msg.substring(0, eol);
            }
            msg = msg.trim();
            if (msg.length() > 0) {
                return msg;
            }
        }
        response = getHttpStatusCode();
        if (response != null) {
            return HttpResponseMessage.STATUS_CODE + " " + response;
        }
        return null;
    }

    public void setParameter(String name, Object value) {
        getParameters().put(name, value);
    }

    public Map<String, Object> getParameters() {
        return parameters;
    }

    public String getProblem() {
        return (String) getParameters().get(OAUTH_PROBLEM);
    }

    public int getHttpStatusCode() {
        Object code = getParameters().get(HttpResponseMessage.STATUS_CODE);
        if (code == null) {
            return 200;
        } else if (code instanceof Number) { // the usual case
            return ((Number) code).intValue();
        } else {
            return Integer.parseInt(code.toString());
        }
    }

    private static final long serialVersionUID = 1L;

}