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/*
 * Copyright (c) 2017. AxonIQ
 * 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 io.axoniq.axondb.client;

import io.axoniq.axondb.client.util.EventCipher;
import io.axoniq.platform.grpc.NodeInfo;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.NestedConfigurationProperty;
import org.springframework.context.annotation.Configuration;

import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 */
@Configuration
@ConfigurationProperties(prefix = "axoniq.axondb")
public class AxonDBConfiguration {
    private static final int DEFAULT_GRPC_PORT = 8123;

    /**
     * Comma seperated list of AxonDB servers. Each element is hostname or hostname:grpcPort. When no grpcPort is specified, default port 8123 is used.
     */
    private String servers;

    @NestedConfigurationProperty
    private FlowControl flowControl = new FlowControl();

    private String token;

    @NestedConfigurationProperty
    private AxonSSL ssl = new AxonSSL();

    /**
     * Wait time (in ms) between retrying to connect to AxonDB
     */
    private long connectionRetry = 2500;
    /**
     * Number of retries when connect to AxonDB fails
     */
    private int connectionRetryCount = 5;

    private EventCipher eventCipher = new EventCipher();
    /**
     * Bounded context that this AxonDB client connects to
     */
    private String context;

    /**
     * Interval (in ms) for keep alive requests, 0 is keep-alive disabled
     */
    private long keepAliveTime = 0;
    /**
     * Timeout (in ms) for keep alive requests
     */
    private long keepAliveTimeout = 5000;
    /**
     * Timeout (in ms) to wait for response on commit
     */
    private long commitTimeout = 10000;

    /**
     * Interval at which the server is requested to send a heartbeat on open event streams, when no
     * events are sent.
     */
    private int heartbeatInterval = 60000;

    public AxonDBConfiguration() {
    }

    public AxonDBConfiguration(EventCipher eventCipher) {
        this.eventCipher = eventCipher;
    }

    @Value("${axoniq.axondb.eventSecretKey:#{null}}")
    private void setEventSecretKey(String key) {
        if(key != null && key.length() > 0) {
            eventCipher = new EventCipher(key.getBytes(StandardCharsets.US_ASCII));
        }
    }

    public static Builder newBuilder(String servers) {
        return new Builder(servers);
    }

    public List serverNodes() {
        List serverNodes = new ArrayList<>();
        if (servers != null) {
            String[] serverArr = servers.split(",");
            Arrays.stream(serverArr).forEach(serverString -> {
                String[] hostPort = serverString.trim().split(":", 2);
                if( hostPort.length == 1) {
                    serverNodes.add(NodeInfo.newBuilder().setHostName(hostPort[0])
                                            .setGrpcPort(DEFAULT_GRPC_PORT)
                                            .build());
                } else {
                    NodeInfo nodeInfo = NodeInfo.newBuilder().setHostName(hostPort[0])
                                                .setGrpcPort(Integer.valueOf(hostPort[1]))
                                                .build();
                    serverNodes.add(nodeInfo);
                }
            });
        }
        return serverNodes;
    }

    public long getConnectionRetry() {
        return connectionRetry;
    }

    public int getConnectionRetryCount() {
        return connectionRetryCount;
    }

    public String getToken() {
        return token;
    }

    public Integer getInitialNrOfPermits() {
        return flowControl.getInitialNrOfPermits();
    }

    public Integer getNrOfNewPermits() {
        return flowControl.getNrOfNewPermits();
    }

    public Integer getNewPermitsThreshold() {
        return flowControl.getNewPermitsThreshold();
    }

    public String getCertFile() {
        return ssl.getCertFile();
    }

    public EventCipher eventCipher() {
        return eventCipher;
    }

    public boolean isSslEnabled() {
        return ssl.isEnabled();
    }

    public String getContext() {
        return context;
    }

    public void setServers(String servers) {
        this.servers = servers;
    }

    public void setFlowControl(FlowControl flowControl) {
        this.flowControl = flowControl;
    }

    public void setToken(String token) {
        this.token = token;
    }

    public void setSsl(AxonSSL ssl) {
        this.ssl = ssl;
    }

    public void setConnectionRetry(long connectionRetry) {
        this.connectionRetry = connectionRetry;
    }

    public void setConnectionRetryCount(int connectionRetryCount) {
        this.connectionRetryCount = connectionRetryCount;
    }

    public void setEventCipher(EventCipher eventCipher) {
        this.eventCipher = eventCipher;
    }

    public void setContext(String context) {
        this.context = context;
    }

    public String getServers() {
        return servers;
    }

    public FlowControl getFlowControl() {
        return flowControl;
    }

    public AxonSSL getSsl() {
        return ssl;
    }

    public long getKeepAliveTime() {
        return keepAliveTime;
    }

    public void setKeepAliveTime(long keepAliveTime) {
        this.keepAliveTime = keepAliveTime;
    }

    public long getKeepAliveTimeout() {
        return keepAliveTimeout;
    }

    public void setKeepAliveTimeout(long keepAliveTimeout) {
        this.keepAliveTimeout = keepAliveTimeout;
    }

    public long getCommitTimeout() {
        return commitTimeout;
    }

    public void setCommitTimeout(long commitTimeout) {
        this.commitTimeout = commitTimeout;
    }

    public int getHeartbeatInterval() {
        return heartbeatInterval;
    }

    public void setHeartbeatInterval(int heartbeatInterval) {
        this.heartbeatInterval = heartbeatInterval;
    }

    public static class Builder {
        private AxonDBConfiguration instance;

        public Builder(String servers) {
            instance = new AxonDBConfiguration();
            instance.servers = servers;
            instance.connectionRetry = 2500;
            instance.connectionRetryCount = 5;
        }

        public Builder ssl(String certificateFilePath) {
            instance.ssl.certFile = certificateFilePath;
            instance.ssl.enabled = certificateFilePath != null;
            return this;
        }

        public Builder token(String token) {
            instance.token = token;
            return this;
        }

        public Builder context(String context) {
            instance.context = context;
            return this;
        }

        public Builder connectionRetry(long connectionRetryTime, int attempts) {
            instance.connectionRetry = connectionRetryTime;
            instance.connectionRetryCount = attempts;
            return this;
        }

        public Builder flowControl(Integer initialNrOfPermits, Integer nrOfNewPermits, Integer newPermitsThreshold) {
            instance.flowControl.setInitialNrOfPermits(initialNrOfPermits);
            instance.flowControl.setNrOfNewPermits(nrOfNewPermits);
            instance.flowControl.setNewPermitsThreshold( newPermitsThreshold);
            return this;
        }

        public Builder setEventSecretKey(String key) {
            instance.setEventSecretKey(key);
            return this;
        }

        public Builder eventCipher(EventCipher eventCipher) {
            instance.eventCipher = eventCipher;
            return this;
        }

        public Builder heartbeatInterval(int heartbeatInterval) {
            instance.setHeartbeatInterval(heartbeatInterval);
            return this;
        }

        public AxonDBConfiguration build() {
            return instance;
        }

    }

    public static class AxonSSL {
        private String certFile;
        private boolean enabled;

        public String getCertFile() {
            return certFile;
        }

        public void setCertFile(String certFile) {
            this.certFile = certFile;
        }

        public boolean isEnabled() {
            return enabled;
        }

        public void setEnabled(boolean enabled) {
            this.enabled = enabled;
        }
    }

    /**
     * Author: marc
     */
    public static class FlowControl {

        private int initialNrOfPermits = 100000;
        private int nrOfNewPermits = 100000;
        private int newPermitsThreshold = 10000;

        public int getInitialNrOfPermits() {
            return initialNrOfPermits;
        }

        public void setInitialNrOfPermits(int initialNrOfPermits) {
            this.initialNrOfPermits = initialNrOfPermits;
        }

        public int getNrOfNewPermits() {
            return nrOfNewPermits;
        }

        public void setNrOfNewPermits(int nrOfNewPermits) {
            this.nrOfNewPermits = nrOfNewPermits;
        }

        public int getNewPermitsThreshold() {
            return newPermitsThreshold;
        }

        public void setNewPermitsThreshold(int newPermitsThreshold) {
            this.newPermitsThreshold = newPermitsThreshold;
        }
    }
}




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