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/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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.zeebe.test.util;

import java.io.*;
import java.nio.charset.Charset;
import java.util.Map;
import java.util.regex.Matcher;

public class TestFileUtil
{

    /**
     * Ant-style property substitution
     */
    public static InputStream readAsTextFileAndReplace(InputStream inputStream, Charset charset, Map properties)
    {
        final String fileContent;
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, charset)))
        {
            final StringBuilder sb = new StringBuilder();

            reader.lines().forEach((line) ->
            {
                String replacingLine = line;

                for (Map.Entry replacement : properties.entrySet())
                {
                    final String property = "\\$\\{" + replacement.getKey() + "\\}";
                    replacingLine = replacingLine.replaceAll(property, Matcher.quoteReplacement(replacement.getValue()));
                }

                sb.append(replacingLine);
                sb.append("\n");
            });

            fileContent = sb.toString();
        }
        catch (IOException e)
        {
            throw new RuntimeException(e);
        }


        return new ByteArrayInputStream(fileContent.getBytes(charset));
    }
}