/**
 * Copyright © 2016-2018 The Thingsboard Authors
 *
 * 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.thingsboard.server.actors.plugin;

import akka.actor.ActorContext;
import akka.actor.ActorRef;
import akka.event.LoggingAdapter;
import com.fasterxml.jackson.core.JsonProcessingException;
import org.thingsboard.server.actors.ActorSystemContext;
import org.thingsboard.server.actors.shared.ComponentMsgProcessor;
import org.thingsboard.server.common.data.id.PluginId;
import org.thingsboard.server.common.data.id.TenantId;
import org.thingsboard.server.common.data.plugin.ComponentLifecycleState;
import org.thingsboard.server.common.data.plugin.ComponentType;
import org.thingsboard.server.common.data.plugin.PluginMetaData;
import org.thingsboard.server.common.msg.cluster.ClusterEventMsg;
import org.thingsboard.server.common.msg.cluster.ServerAddress;
import org.thingsboard.server.extensions.api.plugins.Plugin;
import org.thingsboard.server.extensions.api.plugins.PluginInitializationException;
import org.thingsboard.server.extensions.api.plugins.msg.FromDeviceRpcResponse;
import org.thingsboard.server.extensions.api.plugins.msg.TimeoutMsg;
import org.thingsboard.server.extensions.api.plugins.rest.PluginRestMsg;
import org.thingsboard.server.extensions.api.plugins.rpc.PluginRpcMsg;
import org.thingsboard.server.extensions.api.plugins.ws.msg.PluginWebsocketMsg;
import org.thingsboard.server.extensions.api.rules.RuleException;

/**
 * @author Andrew Shvayka
 */
public class PluginActorMessageProcessor extends ComponentMsgProcessor<PluginId> {

    private final SharedPluginProcessingContext pluginCtx;
    private final PluginProcessingContext trustedCtx;
    private PluginMetaData pluginMd;
    private Plugin pluginImpl;
    private ComponentLifecycleState state;


    protected PluginActorMessageProcessor(TenantId tenantId, PluginId pluginId, ActorSystemContext systemContext
            , LoggingAdapter logger, ActorRef parent, ActorRef self) {
        super(systemContext, logger, tenantId, pluginId);
        this.pluginCtx = new SharedPluginProcessingContext(systemContext, tenantId, pluginId, parent, self);
        this.trustedCtx = new PluginProcessingContext(pluginCtx, null);
    }

    @Override
    public void start() throws Exception {
        logger.info("[{}] Going to start plugin actor.", entityId);
        pluginMd = systemContext.getPluginService().findPluginById(entityId);
        if (pluginMd == null) {
            throw new PluginInitializationException("Plugin not found!");
        }
        if (pluginMd.getConfiguration() == null) {
            throw new PluginInitializationException("Plugin metadata is empty!");
        }
        state = pluginMd.getState();
        if (state == ComponentLifecycleState.ACTIVE) {
            logger.info("[{}] Plugin is active. Going to initialize plugin.", entityId);
            initComponent();
        } else {
            logger.info("[{}] Plugin is suspended. Skipping plugin initialization.", entityId);
        }
    }

    @Override
    public void stop() throws Exception {
        onStop();
    }

    private void initComponent() {
        try {
            pluginImpl = initComponent(pluginMd.getClazz(), ComponentType.PLUGIN, mapper.writeValueAsString(pluginMd.getConfiguration()));
        } catch (InstantiationException e) {
            throw new PluginInitializationException("No default constructor for plugin implementation!", e);
        } catch (IllegalAccessException e) {
            throw new PluginInitializationException("Illegal Access Exception during plugin initialization!", e);
        } catch (ClassNotFoundException e) {
            throw new PluginInitializationException("Plugin Class not found!", e);
        } catch (JsonProcessingException e) {
            throw new PluginInitializationException("Plugin Configuration is invalid!", e);
        } catch (Exception e) {
            throw new PluginInitializationException(e.getMessage(), e);
        }
    }

    public void onRuleToPluginMsg(RuleToPluginMsgWrapper msg) throws RuleException {
        if (state == ComponentLifecycleState.ACTIVE) {
            pluginImpl.process(trustedCtx, msg.getRuleTenantId(), msg.getRuleId(), msg.getMsg());
        } else {
            //TODO: reply with plugin suspended message
        }
    }

    public void onWebsocketMsg(PluginWebsocketMsg<?> msg) {
        if (state == ComponentLifecycleState.ACTIVE) {
            pluginImpl.process(new PluginProcessingContext(pluginCtx, msg.getSecurityCtx()), msg);
        } else {
            //TODO: reply with plugin suspended message
        }
    }

    public void onRestMsg(PluginRestMsg msg) {
        if (state == ComponentLifecycleState.ACTIVE) {
            pluginImpl.process(new PluginProcessingContext(pluginCtx, msg.getSecurityCtx()), msg);
        }
    }

    public void onRpcMsg(PluginRpcMsg msg) {
        if (state == ComponentLifecycleState.ACTIVE) {
            pluginImpl.process(trustedCtx, msg.getRpcMsg());
        } else {
            //TODO: reply with plugin suspended message
        }
    }

    public void onPluginCallbackMsg(PluginCallbackMessage msg) {
        if (state == ComponentLifecycleState.ACTIVE) {
            if (msg.isSuccess()) {
                msg.getCallback().onSuccess(trustedCtx, msg.getV());
            } else {
                msg.getCallback().onFailure(trustedCtx, msg.getE());
            }
        } else {
            //TODO: reply with plugin suspended message
        }
    }


    public void onTimeoutMsg(ActorContext context, TimeoutMsg<?> msg) {
        if (state == ComponentLifecycleState.ACTIVE) {
            pluginImpl.process(trustedCtx, msg);
        }
    }


    public void onDeviceRpcMsg(FromDeviceRpcResponse response) {
        if (state == ComponentLifecycleState.ACTIVE) {
            pluginImpl.process(trustedCtx, response);
        }
    }

    @Override
    public void onClusterEventMsg(ClusterEventMsg msg) {
        if (state == ComponentLifecycleState.ACTIVE) {
            ServerAddress address = msg.getServerAddress();
            if (msg.isAdded()) {
                logger.debug("[{}] Going to process server add msg: {}", entityId, address);
                pluginImpl.onServerAdded(trustedCtx, address);
            } else {
                logger.debug("[{}] Going to process server remove msg: {}", entityId, address);
                pluginImpl.onServerRemoved(trustedCtx, address);
            }
        }
    }

    @Override
    public void onCreated(ActorContext context) {
        logger.info("[{}] Going to process onCreated plugin.", entityId);
    }

    @Override
    public void onUpdate(ActorContext context) throws Exception {
        PluginMetaData oldPluginMd = pluginMd;
        pluginMd = systemContext.getPluginService().findPluginById(entityId);
        boolean requiresRestart = false;
        logger.info("[{}] Plugin configuration was updated from {} to {}.", entityId, oldPluginMd, pluginMd);
        if (!oldPluginMd.getClazz().equals(pluginMd.getClazz())) {
            logger.info("[{}] Plugin requires restart due to clazz change from {} to {}.",
                    entityId, oldPluginMd.getClazz(), pluginMd.getClazz());
            requiresRestart = true;
        } else if (!oldPluginMd.getConfiguration().equals(pluginMd.getConfiguration())) {
            logger.info("[{}] Plugin requires restart due to configuration change from {} to {}.",
                    entityId, oldPluginMd.getConfiguration(), pluginMd.getConfiguration());
            requiresRestart = true;
        }
        if (requiresRestart) {
            this.state = ComponentLifecycleState.SUSPENDED;
            if (pluginImpl != null) {
                pluginImpl.stop(trustedCtx);
            }
            start();
        }
    }

    @Override
    public void onStop(ActorContext context) {
        onStop();
        scheduleMsgWithDelay(context, new PluginTerminationMsg(entityId), systemContext.getPluginActorTerminationDelay());
    }

    private void onStop() {
        logger.info("[{}] Going to process onStop plugin.", entityId);
        this.state = ComponentLifecycleState.SUSPENDED;
        if (pluginImpl != null) {
            pluginImpl.stop(trustedCtx);
        }
    }

    @Override
    public void onActivate(ActorContext context) throws Exception {
        logger.info("[{}] Going to process onActivate plugin.", entityId);
        this.state = ComponentLifecycleState.ACTIVE;
        if (pluginImpl != null) {
            pluginImpl.resume(trustedCtx);
            logger.info("[{}] Plugin resumed.", entityId);
        } else {
            start();
        }
    }

    @Override
    public void onSuspend(ActorContext context) {
        logger.info("[{}] Going to process onSuspend plugin.", entityId);
        this.state = ComponentLifecycleState.SUSPENDED;
        if (pluginImpl != null) {
            pluginImpl.suspend(trustedCtx);
        }
    }

}
