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/******************************************************************************* 
 * Copyright (c) 2016 Red Hat, Inc. 
 * Distributed under license by Red Hat, Inc. All rights reserved. 
 * This program is made available under the terms of the 
 * Eclipse Public License v1.0 which accompanies this distribution, 
 * and is available at http://www.eclipse.org/legal/epl-v10.html 
 * 
 * Contributors: 
 * Red Hat, Inc. - initial API and implementation 
 ******************************************************************************/

package com.openshift.internal.restclient.okhttp;

import java.io.IOException;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.openshift.internal.restclient.DefaultClient;
import com.openshift.internal.restclient.authorization.AuthorizationDetails;
import com.openshift.internal.restclient.model.Status;
import com.openshift.internal.util.URIUtils;
import com.openshift.restclient.BadRequestException;
import com.openshift.restclient.IClient;
import com.openshift.restclient.NotFoundException;
import com.openshift.restclient.OpenShiftException;
import com.openshift.restclient.authorization.ResourceForbiddenException;
import com.openshift.restclient.authorization.UnauthorizedException;
import com.openshift.restclient.http.IHttpConstants;
import com.openshift.restclient.model.IStatus;

import okhttp3.Interceptor;
import okhttp3.Response;

/**
 * Interpret response codes and handle accordingly
 *
 */
public class ResponseCodeInterceptor implements Interceptor, IHttpConstants {

    private static final Logger LOGGER = LoggerFactory.getLogger(ResponseCodeInterceptor.class);

    public static final String X_OPENSHIFT_IGNORE_RCI = "X-OPENSHIFT-IGNORE-RCI";

    private IClient client;
    
    /**
     * If a request tag() implements this interface, HTTP errors will not throw
     * OpenShift exceptions.
     */
    public interface Ignore {
    }

    @Override
    public Response intercept(Chain chain) throws IOException {
        Response response = chain.proceed(chain.request());
        if (!response.isSuccessful()
                && StringUtils.isBlank(response.request().header(X_OPENSHIFT_IGNORE_RCI))) {
            switch (response.code()) {
            case STATUS_UPGRADE_PROTOCOL:
            case STATUS_MOVED_PERMANENTLY:
                break;
            case STATUS_MOVED_TEMPORARILY:
                response = makeSuccessIfAuthorized(response);
                break;
            default:
                if (!isIgnoreTagged(response)) {
                    throw createOpenShiftException(client, response, null);
                }
            }
        }
        return response;
    }

    private boolean isIgnoreTagged(Response response) {
        return response.request().tag() instanceof Ignore;
    }

    private Response makeSuccessIfAuthorized(final Response response) {
        Response returnedResponse = response;
        String location = response.header(PROPERTY_LOCATION);
        if (StringUtils.isNotBlank(location)
                && URIUtils.splitFragment(location).containsKey(IHttpConstants.PROPERTY_ACCESS_TOKEN)) {
            returnedResponse = response.newBuilder()
                    .request(response.request())
                    .code(STATUS_OK)
                    .headers(response.headers())
                    .build();
            response.close();
        }
        return returnedResponse;
    }

    public void setClient(DefaultClient client) {
        this.client = client;
    }

    public static IStatus getStatus(String response) {
        if (response != null && response.startsWith("{")) {
            return new Status(response);
        }
        return null;
    }

    private static OpenShiftException createOpenShiftException(IClient client, Response response, Throwable e)
            throws IOException {
        LOGGER.debug(response.toString(), e);
        IStatus status = getStatus(response.body().string());
        int responseCode = response.code();
        if (status != null && status.getCode() != 0) {
            responseCode = status.getCode();
        }
        switch (responseCode) {
        case STATUS_BAD_REQUEST:
            return new BadRequestException(e, status, response.request().url().toString());
        case STATUS_FORBIDDEN:
            return new ResourceForbiddenException(
                    status != null ? status.getMessage() : "Resource Forbidden", status, e);
        case STATUS_UNAUTHORIZED:
            String link = String.format("%s/oauth/token/request", client.getBaseURL());
            AuthorizationDetails details = new AuthorizationDetails(response.headers(), link);
            return new UnauthorizedException(details, status);
        case IHttpConstants.STATUS_NOT_FOUND:
            return new NotFoundException(e, status, status == null ? "Not Found" : status.getMessage());
        default:
            return new OpenShiftException(e, status, "Exception trying to %s %s response code: %s",
                    response.request().method(), response.request().url().toString(), responseCode);
        }
    }

    public static OpenShiftException createOpenShiftException(IClient client, int responseCode, String message,
            String response, Throwable e) {
        LOGGER.debug(response, e);
        IStatus status = getStatus(response);
        if (status != null && status.getCode() != 0) {
            responseCode = status.getCode();
        }
        switch (responseCode) {
        case STATUS_BAD_REQUEST:
            return new BadRequestException(e, status, response);
        case STATUS_FORBIDDEN:
            return new ResourceForbiddenException(status != null ? status.getMessage() : "Resource Forbidden", status,
                    e);
        case STATUS_UNAUTHORIZED:
            return new UnauthorizedException(
                    client.getAuthorizationContext().getAuthorizationDetails(), status);
        case IHttpConstants.STATUS_NOT_FOUND:
            return new NotFoundException(status == null ? "Not Found" : status.getMessage());
        default:
            return new OpenShiftException(e, status, "Exception trying to fetch %s response code: %s", response,
                    responseCode);
        }
    }

}