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/*
 * Copyright 2018 Proofpoint, 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 com.proofpoint.reporting;

import jakarta.annotation.Nullable;

import javax.management.MBeanException;
import javax.management.ReflectionException;
import java.lang.reflect.Method;

import static com.proofpoint.reporting.PrometheusBeanAttribute.ValueAndTimestamp.valueAndTimestamp;
import static com.proofpoint.reporting.ReflectionUtils.invoke;
import static com.proofpoint.reporting.SimplePrometheusValue.simplePrometheusValue;
import static java.util.Objects.requireNonNull;
import static java.util.Objects.requireNonNullElse;

class BooleanPrometheusBeanAttribute implements PrometheusBeanAttribute
{
    private final Object target;
    private final String name;
    private final Method getter;

    BooleanPrometheusBeanAttribute(String name, Object target, Method getter)
    {
        this.name = requireNonNull(name, "name is null");
        this.target = requireNonNull(target, "target is null");
        this.getter = requireNonNull(getter, "getter is null");
    }

    @Override
    public String getName()
    {
        return name;
    }

    @Override
    public ValueAndTimestamp getValue(@Nullable Object target)
            throws MBeanException, ReflectionException
    {
        Boolean value = (Boolean) invoke(requireNonNullElse(target, this.target), getter);
        if (value == null) {
            return null;
        }
        if (value) {
            return valueAndTimestamp(simplePrometheusValue(1), null);
        }
        return valueAndTimestamp(simplePrometheusValue(0), null);
    }
}