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/**
 * 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 net.logstash.logback.composite.loggingevent;

import java.io.IOException;

import net.logstash.logback.argument.StructuredArgument;
import net.logstash.logback.composite.AbstractFieldJsonProvider;
import org.apache.juli.logging.ch.qos.logback.classic.spi.ILoggingEvent;

import com.fasterxml.jackson.core.JsonGenerator;

/**
 * Include the logging event's {@link ILoggingEvent#getArgumentArray()} in the JSON output.
 * 
 *
 * Arguments that are an instance of {@link StructuredArgument} will be output
 * as specified by {@link StructuredArgument#writeTo(JsonGenerator)}.
 * 

 * 
 * Non-{@link StructuredArgument}s will be omitted unless {@link #includeNonStructuredArguments} is true.
 * When true, they will be included in the JSON output as separate fields
 * whose names are {@link #nonStructuredArgumentsFieldPrefix} plus the argument index.
 * (For example, "arg0").
 * 
 *
 * If the fieldName is non-null, then the arguments will be written to that field as a subobject.
 * Otherwise, the arguments are written inline.
 */
public class ArgumentsJsonProvider extends AbstractFieldJsonProvider {

    private boolean includeNonStructuredArguments;
    private String nonStructuredArgumentsFieldPrefix = "arg";

    @Override
    public void writeTo(JsonGenerator generator, ILoggingEvent event) throws IOException {

        Object[] args = event.getArgumentArray();

        if (args == null || args.length == 0) {
            return;
        }

        boolean hasWrittenFieldName = false;
        
        for (int argIndex = 0; argIndex < args.length; argIndex++) {

            Object arg = args[argIndex];

            if (arg instanceof StructuredArgument) {
                if (!hasWrittenFieldName && getFieldName() != null) {
                    generator.writeObjectFieldStart(getFieldName());
                    hasWrittenFieldName = true;
                }
                StructuredArgument structuredArgument = (StructuredArgument) arg;
                structuredArgument.writeTo(generator);
            } else if (includeNonStructuredArguments) {
                if (!hasWrittenFieldName && getFieldName() != null) {
                    generator.writeObjectFieldStart(getFieldName());
                    hasWrittenFieldName = true;
                }
                String fieldName = nonStructuredArgumentsFieldPrefix + argIndex;
                generator.writeObjectField(fieldName, arg);
            }
        }

        if (hasWrittenFieldName) {
            generator.writeEndObject();
        }
    }

    public boolean isIncludeNonStructuredArguments() {
        return includeNonStructuredArguments;
    }

    public void setIncludeNonStructuredArguments(boolean includeArgumentWithNoKey) {
        this.includeNonStructuredArguments = includeArgumentWithNoKey;
    }

    public String getNonStructuredArgumentsFieldPrefix() {
        return nonStructuredArgumentsFieldPrefix;
    }

    public void setNonStructuredArgumentsFieldPrefix(String argumentWithNoKeyPrefix) {
        this.nonStructuredArgumentsFieldPrefix = argumentWithNoKeyPrefix;
    }
}