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package org.netbeans.modules.php.phpunit.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.netbeans.api.annotations.common.CheckForNull;
import org.netbeans.api.extexecution.ExecutionDescriptor;
import org.netbeans.api.extexecution.base.input.InputProcessor;
import org.netbeans.api.extexecution.base.input.InputProcessors;
import org.netbeans.api.extexecution.base.input.LineProcessor;

public class VersionOutputProcessorFactory implements ExecutionDescriptor.InputProcessorFactory2 {

    private final Pattern versionPattern;

    volatile String version;


    public VersionOutputProcessorFactory(String versionPattern) {
        assert versionPattern != null;
        this.versionPattern = Pattern.compile(versionPattern, Pattern.CASE_INSENSITIVE);
    }

    @Override
    public InputProcessor newInputProcessor(InputProcessor defaultProcessor) {
        return InputProcessors.bridge(new LineProcessor() {

            @Override
            public void processLine(String line) {
                if (version == null) {
                    version = parseVersion(line);
                }
            }

            @Override
            public void reset() {
            }

            @Override
            public void close() {
            }

        });
    }

    public String getVersion() {
        return version;
    }

    @CheckForNull
    public String parseVersion(String line) {
        Matcher matcher = versionPattern.matcher(line);
        if (matcher.find()) {
            return matcher.group(1);
        }
        return null;
    }

}
