/*
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.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpDelete;
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.builders.DiskBuilder;
import org.ovirt.engine.sdk4.internal.HttpConnection;
import org.ovirt.engine.sdk4.internal.xml.XmlActionWriter;
import org.ovirt.engine.sdk4.internal.xml.XmlSnapshotReader;
import org.ovirt.engine.sdk4.services.SnapshotCdromsService;
import org.ovirt.engine.sdk4.services.SnapshotDisksService;
import org.ovirt.engine.sdk4.services.SnapshotNicsService;
import org.ovirt.engine.sdk4.services.SnapshotService;
import org.ovirt.engine.sdk4.types.Action;
import org.ovirt.engine.sdk4.types.Disk;
import org.ovirt.engine.sdk4.types.Snapshot;

public class SnapshotServiceImpl extends ServiceImpl implements SnapshotService {
    
    public SnapshotServiceImpl(HttpConnection connection, String path) {
        super(connection, path);
    }
    
    private class GetRequestImpl extends BaseRequest<GetRequest, GetResponse> implements GetRequest {
        public GetResponse send() {
            HttpGet request = null;
            try {
                URIBuilder uriBuilder = new URIBuilder(getConnection().getUrl() + getPath());
                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(XmlSnapshotReader.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 Snapshot snapshot;
        
        public GetResponseImpl(Snapshot snapshot) {
            this.snapshot = snapshot;
        }
        
        public Snapshot snapshot() {
            return snapshot;
        }
        
    }
    
    public GetRequest get() {
        return new GetRequestImpl();
    }
    
    private class RemoveRequestImpl extends BaseRequest<RemoveRequest, RemoveResponse> implements RemoveRequest {
        private Boolean allContent;
        public RemoveRequest allContent(Boolean allContent) {
            this.allContent = allContent;
            return this;
        }
        
        private Boolean async;
        public RemoveRequest async(Boolean async) {
            this.async = async;
            return this;
        }
        
        public RemoveResponse send() {
            HttpDelete request = null;
            try {
                URIBuilder uriBuilder = new URIBuilder(getConnection().getUrl() + getPath());
                if (allContent != null) {
                    uriBuilder.addParameter("all_content", XmlWriter.renderBoolean(allContent));
                }
                if (async != null) {
                    uriBuilder.addParameter("async", XmlWriter.renderBoolean(async));
                }
                if (query != null) {
                    for (Map.Entry<String, String> queryParam : query.entrySet()) {
                        uriBuilder.addParameter(queryParam.getKey(), queryParam.getValue());
                    }
                }
                request = new HttpDelete(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
            ) {
                EntityUtils.consumeQuietly(response.getEntity());
                return new RemoveResponseImpl();
            }
            else {
                checkFault(response);
                return new RemoveResponseImpl();
            }
        }
        
    }
    
    private class RemoveResponseImpl implements RemoveResponse {
    }
    
    public RemoveRequest remove() {
        return new RemoveRequestImpl();
    }
    
    private class RestoreRequestImpl extends BaseRequest<RestoreRequest, RestoreResponse> implements RestoreRequest {
        private Boolean async;
        public RestoreRequest async(Boolean async) {
            this.async = async;
            return this;
        }
        
        private List<Disk> disks;
        public RestoreRequest disks(List<Disk> disks) {
            this.disks = disks;
            return this;
        }
        
        public RestoreRequest disks(Disk... disks) {
            this.disks = Arrays.asList(disks);
            return this;
        }
        
        public RestoreRequest disks(DiskBuilder... disks) {
            this.disks = new ArrayList<>(disks.length);
            for (DiskBuilder element : disks) {
                this.disks.add(element.build());
            }
            return this;
        }
        
        private Boolean restoreMemory;
        public RestoreRequest restoreMemory(Boolean restoreMemory) {
            this.restoreMemory = restoreMemory;
            return this;
        }
        
        public RestoreResponse send() {
            HttpPost request = new HttpPost(getConnection().getUrl() + getPath() + "/restore");
            try (
              ByteArrayOutputStream output = new ByteArrayOutputStream();
              XmlWriter xmlWriter = new XmlWriter(output, true)
            ) {
                ActionBuilder action = new ActionBuilder();
                action.async(async);
                action.disks(disks);
                action.restoreMemory(restoreMemory);
                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 RestoreResponseImpl();
        }
        
    }
    
    private class RestoreResponseImpl implements RestoreResponse {
    }
    
    public RestoreRequest restore() {
        return new RestoreRequestImpl();
    }
    
    public SnapshotCdromsService cdromsService() {
        return new SnapshotCdromsServiceImpl(getConnection(), getPath() + "/cdroms");
    }
    
    public SnapshotDisksService disksService() {
        return new SnapshotDisksServiceImpl(getConnection(), getPath() + "/disks");
    }
    
    public SnapshotNicsService nicsService() {
        return new SnapshotNicsServiceImpl(getConnection(), getPath() + "/nics");
    }
    
    public Service service(String path) {
        if (path == null) {
            return this;
        }
        
        if (path.equals("cdroms")) {
            return cdromsService();
        }
        if (path.startsWith("cdroms/")) {
            return cdromsService().service(path.substring(7));
        }
        if (path.equals("disks")) {
            return disksService();
        }
        if (path.startsWith("disks/")) {
            return disksService().service(path.substring(6));
        }
        if (path.equals("nics")) {
            return nicsService();
        }
        if (path.startsWith("nics/")) {
            return nicsService().service(path.substring(5));
        }
        throw new Error("The path " + path + " doesn't correspond to any service");
    }
    
    public String toString() {
        return "SnapshotService:" + getPath();
    }
    
}

