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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.xream.x7.common.util;

import org.springframework.expression.EvaluationContext;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.util.Assert;

public class KeyUtil {

    private KeyUtil() {
    }

    public static String makeKey(String prefix, String suffix, String condition, Object[] args) {

        Assert.notNull(condition, "condition can not null");
        if (args != null && args.length > 0 && condition.contains("#")) {

            Object obj = args[0];

            if (obj != null) {
                ExpressionParser parser = new SpelExpressionParser();

                int start = condition.indexOf("#") + 1;
                int end = 0;
                if (condition.contains(".")) {
                    end = condition.indexOf(".");
                } else {
                    end = condition.indexOf(" ");
                }

                String objName = condition.substring(start, end).trim();

                EvaluationContext ctx = new StandardEvaluationContext();
                ctx.setVariable(objName, obj);

                condition = parser.parseExpression(condition).getValue(ctx, String.class);
            }
        }

        String key = VerifyUtil.toMD5(prefix + condition) + suffix;

        return key;
    }
}