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/*
 * Copyright (c) 2022 nosqlbench
 *
 * 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 io.nosqlbench.virtdata.library.basics.shared.unary_int;

import io.nosqlbench.virtdata.api.annotations.Categories;
import io.nosqlbench.virtdata.api.annotations.Category;
import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
import io.nosqlbench.virtdata.library.basics.core.MVELExpr;
import io.nosqlbench.virtdata.library.basics.core.threadstate.SharedState;
import org.mvel2.MVEL;

import java.io.Serializable;
import java.util.HashMap;
import java.util.function.IntUnaryOperator;

@ThreadSafeMapper
@Categories({Category.functional})
public class Expr implements IntUnaryOperator {

    private final String expr;
    private final Serializable compiledExpr;

    public Expr(String expr) {
        this.expr = expr;
        this.compiledExpr = MVELExpr.compile(int.class, "cycle", expr);
    }

    @Override
    public int applyAsInt(int operand) {
        HashMap map = SharedState.tl_ObjectMap.get();
        map.put("cycle",operand);
        int result = MVEL.executeExpression(compiledExpr, map, int.class);
        return result;
    }
}