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/*

 * @test TestG1ConcMarkStepDurationMillis

 * @key gc

 * @requires vm.gc.G1

 * @summary Tests argument processing for double type flag, G1ConcMarkStepDurationMillis

 * @modules java.base/jdk.internal.misc

 *          java.management

 */

import java.util.*;

import java.util.regex.*;

public class TestG1ConcMarkStepDurationMillis {

  static final int PASS                = 0;

  static final int FAIL_IMPROPER_VALUE = 1;

  static final int FAIL_OUT_RANGE      = 2;

  static final String DOUBLE_1       = "1.0";

  static final String DOUBLE_MAX     = "1.79e+308";

  static final String DOUBLE_NEG_EXP = "1.0e-30";

  static final String NEG_DOUBLE_1   = "-1.0";

  static final String DOUBLE_INF     = "1.79e+309";

  static final String NEG_DOUBLE_INF = "-1.79e+309";

  static final String DOUBLE_NAN     = "abe+309";

  static final String WRONG_DOUBLE_1 = "1.79e+308e";

  static final String WRONG_DOUBLE_2 = "1.79ee+308";

  public static void main(String args[]) throws Exception {

    // Pass cases

    runG1ConcMarkStepDurationMillisTest(DOUBLE_1,       PASS);

    runG1ConcMarkStepDurationMillisTest(DOUBLE_MAX,     PASS);

    // Fail cases: out of range

    runG1ConcMarkStepDurationMillisTest(DOUBLE_NEG_EXP, FAIL_OUT_RANGE);

    runG1ConcMarkStepDurationMillisTest(NEG_DOUBLE_1,   FAIL_OUT_RANGE);

    // Fail cases: not double

    runG1ConcMarkStepDurationMillisTest(DOUBLE_INF,     FAIL_IMPROPER_VALUE);

    runG1ConcMarkStepDurationMillisTest(NEG_DOUBLE_INF, FAIL_IMPROPER_VALUE);

    runG1ConcMarkStepDurationMillisTest(DOUBLE_NAN,     FAIL_IMPROPER_VALUE);

    runG1ConcMarkStepDurationMillisTest(WRONG_DOUBLE_1, FAIL_IMPROPER_VALUE);

    runG1ConcMarkStepDurationMillisTest(WRONG_DOUBLE_2, FAIL_IMPROPER_VALUE);

  }

  private static void runG1ConcMarkStepDurationMillisTest(String expectedValue, int expectedResult) throws Exception {

    List<String> vmOpts = new ArrayList<>();

    Collections.addAll(vmOpts, "-XX:+UseG1GC", "-XX:G1ConcMarkStepDurationMillis="+expectedValue, "-XX:+PrintFlagsFinal", "-version");

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(vmOpts.toArray(new String[vmOpts.size()]));

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    output.shouldHaveExitValue(expectedResult == PASS ? 0 : 1);

    String stdout = output.getStdout();

    if (expectedResult == PASS) {

      checkG1ConcMarkStepDurationMillisConsistency(stdout, expectedValue);

    } else if (expectedResult == FAIL_IMPROPER_VALUE) {

      output.shouldContain("Improperly specified VM option");

    } else if (expectedResult == FAIL_OUT_RANGE) {

      output.shouldContain("outside the allowed range");

    }

  }

  private static void checkG1ConcMarkStepDurationMillisConsistency(String output, String expectedValue) {

    double actualValue = getDoubleValue("G1ConcMarkStepDurationMillis", output);

    if (Double.parseDouble(expectedValue) != actualValue) {

      throw new RuntimeException(

            "Actual G1ConcMarkStepDurationMillis(" + Double.toString(actualValue)

            + ") is not equal to expected value(" + expectedValue + ")");

    }

  }

  public static double getDoubleValue(String flag, String where) {

    Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);

    if (!m.find()) {

      throw new RuntimeException("Could not find value for flag " + flag + " in output string");

    }

    String match = m.group();

    return Double.parseDouble(match.substring(match.lastIndexOf(" ") + 1, match.length()));

  }

}