/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.so.cloudify.base.client;

import java.util.Properties;
import org.onap.so.cloudify.connector.http.HttpClientConnector;

public class CloudifyClient {

    protected String managerEndpoint;
    protected String tenant = "default_tenant"; // Note - only default_tenant supported in community edition

    protected CloudifyTokenProvider tokenProvider;

    protected static int AUTHENTICATION_RETRIES = 1;

    protected CloudifyClientConnector connector;

    protected Properties properties = new Properties();

    public CloudifyClient(String managerEndpoint) {
        this.managerEndpoint = managerEndpoint;
        this.connector = new HttpClientConnector();
    }

    public CloudifyClient(String managerEndpoint, String tenant) {
        this.managerEndpoint = managerEndpoint;
        this.tenant = tenant;
        this.connector = new HttpClientConnector();
    }

    public CloudifyClient(String managerEndpoint, CloudifyClientConnector connector) {
        this.managerEndpoint = managerEndpoint;
        this.connector = connector;
    }

    /**
     * Execute a Cloudify request by making the REST API call. Return the complete CloudifyResponse structure, which
     * includes the complete HTTP response.
     * 
     * @param request a CloudifyRequest object
     * @return a CloudifyResponse object
     */
    public <T> CloudifyResponse request(CloudifyRequest<T> request) {
        CloudifyResponseException authException = null;

        for (int i = 0; i <= AUTHENTICATION_RETRIES; i++) {
            request.endpoint(managerEndpoint);
            request.header("Tenant", tenant);
            if (tokenProvider != null)
                request.header("Authentication-Token", tokenProvider.getToken());

            try {
                return connector.request(request);
            } catch (CloudifyResponseException e) {
                if (e.getStatus() != CloudifyResponseStatus.NOT_AUTHORIZED || tokenProvider == null) {
                    throw e;
                }
                authException = e;
                tokenProvider.expireToken();
            }
        }

        if (authException != null) {
            throw authException;
        }

        return null;
    }

    /**
     * Execute a CloudifyRequest by sending the REST API call to the Cloudify Manager endpoint. The return type is a
     * JSON POJO object containing the response body entity.
     * 
     * @param request
     * @return a JSON POJO object specific to the request type
     */
    public <T> T execute(CloudifyRequest<T> request) {
        CloudifyResponse response = request(request);

        if (null == response) {
            return null;
        }

        return (request.returnType() != null && request.returnType() != Void.class)
                ? response.getEntity(request.returnType())
                : null;
    }

    public void property(String property, String value) {
        properties.put(property, value);
    }

    /**
     * Set a Token Provider. This class should be able to produce an authentication token on-demand.
     * 
     * @param tokenProvider
     */
    public void setTokenProvider(CloudifyTokenProvider tokenProvider) {
        this.tokenProvider = tokenProvider;
    }

    /**
     * Manually set the authentication token to use for this client.
     * 
     * @param token
     */
    public void setToken(String token) {
        setTokenProvider(new CloudifySimpleTokenProvider(token));
    }

    /**
     * Perform a simple GET request with no request message body
     * 
     * @param path
     * @param returnType
     * @return An object of Class <R>
     */
    public <R> CloudifyRequest<R> get(String path, Class<R> returnType) {
        return new CloudifyRequest<>(this, HttpMethod.GET, path, null, returnType);
    }

}