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package com.oracle.truffle.llvm.tests;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.junit.Assert;
import org.junit.Test;

import com.oracle.truffle.llvm.tests.pipe.CaptureNativeOutput;
import com.oracle.truffle.llvm.tests.util.ProcessUtil;
import com.oracle.truffle.llvm.tests.util.ProcessUtil.ProcessResult;

public abstract class BaseSingleTestHarness extends BaseTestHarness {

    @Override
    @Test
    public void test() throws IOException {
        Path referenceFile;
        try (Stream<Path> files = Files.walk(getTestDirectory())) {
            List<Path> executables = files.filter(isExecutable).collect(Collectors.toList());
            assert executables.size() == 1;
            referenceFile = executables.get(0);
        }
        try (Stream<Path> files = Files.walk(getTestDirectory())) {
            List<Path> testCandidates = files.filter(isFile).filter(isSulong).collect(Collectors.toList());
            String command = referenceFile.toAbsolutePath().toString() + " " + Arrays.stream(getArguments(referenceFile.getParent())).map(String::valueOf).collect(Collectors.joining(" "));
            ProcessResult processResult = ProcessUtil.executeNativeCommand(command);
            String referenceStdOut = processResult.getStdOutput();
            final int referenceReturnValue = processResult.getReturnValue();

            for (Path candidate : testCandidates) {
                if (!filterFileName().test(candidate.getFileName().toString())) {
                    continue;
                }

                if (!candidate.toAbsolutePath().toFile().exists()) {
                    throw new AssertionError("File " + candidate.toAbsolutePath().toFile() + " does not exist.");
                }

                ProcessResult out = ProcessUtil.executeSulongTestMain(candidate.toAbsolutePath().toFile(), getArguments(candidate.getParent()), getContextOptions(), c -> new CaptureNativeOutput());
                int sulongResult = out.getReturnValue();
                String sulongStdOut = out.getStdOutput();

                if (sulongResult != (sulongResult & 0xFF)) {
                    Assert.fail("Broken unittest " + getTestDirectory() + ". Test exits with invalid value.");
                }
                String testName = candidate.getFileName().toString() + " in " + getTestDirectory().toAbsolutePath().toString();
                Assert.assertEquals(testName + " failed. Posix return value missmatch.", referenceReturnValue,
                                sulongResult);
                Assert.assertEquals(testName + " failed. Output (stdout) missmatch.", referenceStdOut,
                                sulongStdOut);
            }
        }
    }

    protected abstract String[] getArguments(Path testCandidate);

}