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package com.oracle.truffle.llvm.test.alpha;

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

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

import com.oracle.truffle.llvm.Sulong;
import com.oracle.truffle.llvm.pipe.CaptureOutput;
import com.oracle.truffle.llvm.test.util.ProcessUtil;
import com.oracle.truffle.llvm.test.util.ProcessUtil.ProcessResult;

public abstract class BaseSingleTestHarness extends BaseTestHarness {

    @Override
    @Test
    public void test() throws Exception {
        assert Files.walk(getTestDirectory()).filter(isExecutable).count() == 1;

        Path referenceFile = Files.walk(getTestDirectory()).filter(isExecutable).findFirst().get();
        List<Path> testCandidates = Files.walk(getTestDirectory()).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.");
            }

            int sulongResult = -1;
            String sulongStdOut;
            try (CaptureOutput out = new CaptureOutput()) {
                sulongResult = Sulong.executeMain(candidate.toAbsolutePath().toFile(), getArguments(candidate.getParent()));
                System.out.flush();
                sulongStdOut = out.getResult();
            }

            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 Object[] getArguments(Path testCandidate);

}