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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.plugins.pipelineprocessor.functions;

import org.graylog.plugins.pipelineprocessor.EvaluationContext;
import org.graylog.plugins.pipelineprocessor.ast.functions.AbstractFunction;
import org.graylog.plugins.pipelineprocessor.ast.functions.FunctionArgs;
import org.graylog.plugins.pipelineprocessor.ast.functions.FunctionDescriptor;
import org.graylog.plugins.pipelineprocessor.ast.functions.ParameterDescriptor;
import org.graylog.plugins.pipelineprocessor.rulebuilder.RuleBuilderFunctionGroup;

import static com.google.common.collect.ImmutableList.of;

public class IsNotNull extends AbstractFunction {

    public static final String NAME = "is_not_null";
    private final ParameterDescriptor valueParam;

    public IsNotNull() {
        valueParam = ParameterDescriptor.type("value", Object.class).ruleBuilderVariable().description("The value to check").build();
    }

    @Override
    public Boolean evaluate(FunctionArgs args, EvaluationContext context) {
        try {
            final Object value = valueParam.required(args, context);
            return value != null;
        } catch (Exception e) {
            return false;
        }
    }

    @Override
    public FunctionDescriptor descriptor() {
        return FunctionDescriptor.builder()
                .name(NAME)
                .returnType(Boolean.class)
                .params(of(valueParam))
                .description("Checks whether a value is not 'null'")
                .ruleBuilderEnabled(false)
                .ruleBuilderName("Check if not null")
                .ruleBuilderTitle("Check if value is not null")
                .ruleBuilderFunctionGroup(RuleBuilderFunctionGroup.BOOLEAN)
                .build();
    }
}