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/**
 * Copyright © 2014-2021 The SiteWhere 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 com.sitewhere.microservice.grpc;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sitewhere.spi.SiteWhereException;
import com.sitewhere.spi.SiteWhereSystemException;
import com.sitewhere.spi.error.ErrorCode;
import com.sitewhere.spi.microservice.multitenant.TenantEngineNotAvailableException;

import io.grpc.MethodDescriptor;
import io.grpc.Status;
import io.grpc.Status.Code;
import io.grpc.StatusException;
import io.grpc.stub.StreamObserver;

public class GrpcUtils {

    /** Static logger instance */
    private static Logger LOGGER = LoggerFactory.getLogger(GrpcUtils.class);

    /**
     * Handle server exception by logging it, then converting to a format that can
     * be passed back across the wire to a client.
     * 
     * @param method
     * @param t
     * @param observer
     */
    public static void handleServerMethodException(MethodDescriptor method, Throwable t,
	    StreamObserver observer) {
	LOGGER.error("Server exception in call to " + method.getFullMethodName() + ".", t);
	Throwable thrown = convertServerException(t);
	observer.onError(thrown);
    }

    /**
     * Convert server exception to one that can be passed back via GRPC.
     * 
     * @param t
     * @return
     */
    public static StatusException convertServerException(Throwable t) {
	StatusException thrown = null;
	if (t instanceof SiteWhereSystemException) {
	    SiteWhereSystemException sysex = (SiteWhereSystemException) t;
	    Status status = Status.fromCode(Code.FAILED_PRECONDITION)
		    .withDescription(sysex.getCode().getCode() + ":" + sysex.getCode().getMessage());
	    thrown = status.asException();
	} else if (t instanceof TenantEngineNotAvailableException) {
	    TenantEngineNotAvailableException sw = (TenantEngineNotAvailableException) t;
	    Status status = Status.fromCode(Code.UNAVAILABLE).withDescription(sw.getMessage());
	    thrown = status.asException();
	} else if (t instanceof SiteWhereException) {
	    SiteWhereException sw = (SiteWhereException) t;
	    Status status = Status.fromCode(Code.FAILED_PRECONDITION)
		    .withDescription(ErrorCode.Error.getCode() + ":" + sw.getMessage());
	    thrown = status.asException();
	} else {
	    thrown = Status.fromThrowable(t).asException();
	}
	return thrown;
    }
}