/*
Copyright (c) 2015 Red Hat, 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 org.ovirt.engine.sdk4.internal.services;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.Map;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.util.EntityUtils;
import org.ovirt.api.metamodel.runtime.xml.XmlReader;
import org.ovirt.api.metamodel.runtime.xml.XmlWriter;
import org.ovirt.engine.sdk4.BaseRequest;
import org.ovirt.engine.sdk4.Error;
import org.ovirt.engine.sdk4.Service;
import org.ovirt.engine.sdk4.builders.ActionBuilder;
import org.ovirt.engine.sdk4.internal.HttpConnection;
import org.ovirt.engine.sdk4.internal.xml.XmlActionWriter;
import org.ovirt.engine.sdk4.internal.xml.XmlStepReader;
import org.ovirt.engine.sdk4.services.StatisticsService;
import org.ovirt.engine.sdk4.services.StepService;
import org.ovirt.engine.sdk4.types.Action;
import org.ovirt.engine.sdk4.types.Step;

public class StepServiceImpl extends MeasurableServiceImpl implements StepService {
    
    public StepServiceImpl(HttpConnection connection, String path) {
        super(connection, path);
    }
    
    private class EndRequestImpl extends BaseRequest<EndRequest, EndResponse> implements EndRequest {
        private Boolean async;
        public EndRequest async(Boolean async) {
            this.async = async;
            return this;
        }
        
        private Boolean force;
        public EndRequest force(Boolean force) {
            this.force = force;
            return this;
        }
        
        private Boolean succeeded;
        public EndRequest succeeded(Boolean succeeded) {
            this.succeeded = succeeded;
            return this;
        }
        
        public EndResponse send() {
            HttpPost request = new HttpPost(getConnection().getUrl() + getPath() + "/end");
            try (
              ByteArrayOutputStream output = new ByteArrayOutputStream();
              XmlWriter xmlWriter = new XmlWriter(output, true)
            ) {
                ActionBuilder action = new ActionBuilder();
                action.async(async);
                action.force(force);
                action.succeeded(succeeded);
                XmlActionWriter.writeOne(action.build(), xmlWriter);
                xmlWriter.flush();
                request.setEntity(new ByteArrayEntity(output.toByteArray()));
            }
            catch (IOException ex) {
                throw new Error("Failed to write request", ex);
            }
            
            if (headers != null) {
                for (Map.Entry<String, String> header : headers.entrySet()) {
                    request.setHeader(header.getKey(), header.getValue());
                }
            }
            
            HttpResponse response = getConnection().send(request);
            Action action = checkAction(response);
            EntityUtils.consumeQuietly(response.getEntity());
            return new EndResponseImpl();
        }
        
    }
    
    private class EndResponseImpl implements EndResponse {
    }
    
    public EndRequest end() {
        return new EndRequestImpl();
    }
    
    private class GetRequestImpl extends BaseRequest<GetRequest, GetResponse> implements GetRequest {
        private String follow;
        public GetRequest follow(String follow) {
            this.follow = follow;
            return this;
        }
        
        public GetResponse send() {
            HttpGet request = null;
            try {
                URIBuilder uriBuilder = new URIBuilder(getConnection().getUrl() + getPath());
                if (follow != null) {
                    uriBuilder.addParameter("follow", XmlWriter.renderString(follow));
                }
                if (query != null) {
                    for (Map.Entry<String, String> queryParam : query.entrySet()) {
                        uriBuilder.addParameter(queryParam.getKey(), queryParam.getValue());
                    }
                }
                request = new HttpGet(uriBuilder.build());
            }
            catch (URISyntaxException ex) {
                throw new Error("Failed to build URL", ex);
            }
            
            if (headers != null) {
                for (Map.Entry<String, String> header : headers.entrySet()) {
                    request.setHeader(header.getKey(), header.getValue());
                }
            }
            
            HttpResponse response = getConnection().send(request);
            if (
              response.getStatusLine().getStatusCode() == 200
            ) {
                try (
                  XmlReader reader = new XmlReader(response.getEntity().getContent())
                ) {
                    return new GetResponseImpl(XmlStepReader.readOne(reader));
                }
                catch (IOException ex) {
                    throw new Error("Failed to read response", ex);
                }
                finally {
                    EntityUtils.consumeQuietly(response.getEntity());
                }
            }
            else {
                checkFault(response);
                return new GetResponseImpl(null);
            }
        }
        
    }
    
    private class GetResponseImpl implements GetResponse {
        private Step step;
        
        public GetResponseImpl(Step step) {
            this.step = step;
        }
        
        public Step step() {
            return step;
        }
        
    }
    
    public GetRequest get() {
        return new GetRequestImpl();
    }
    
    public StatisticsService statisticsService() {
        return new StatisticsServiceImpl(getConnection(), getPath() + "/statistics");
    }
    
    public Service service(String path) {
        if (path == null) {
            return this;
        }
        
        if (path.equals("statistics")) {
            return statisticsService();
        }
        if (path.startsWith("statistics/")) {
            return statisticsService().service(path.substring(11));
        }
        throw new Error("The path " + path + " doesn't correspond to any service");
    }
    
    public String toString() {
        return "StepService:" + getPath();
    }
    
}

