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package com.oracle.truffle.llvm.tests.interop;

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;

import com.oracle.truffle.llvm.runtime.NativeContextExtension;
import com.oracle.truffle.llvm.runtime.options.SulongEngineOption;
import com.oracle.truffle.llvm.tests.BaseSuiteHarness;
import org.graalvm.polyglot.Context;
import org.junit.ClassRule;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.TruffleFile;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.InteropException;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.llvm.tests.options.TestOptions;
import com.oracle.truffle.tck.TruffleRunner;
import org.graalvm.polyglot.Value;

public class InteropTestBase {

    @ClassRule public static TruffleRunner.RunWithPolyglotRule runWithPolyglot = new TruffleRunner.RunWithPolyglotRule(getContextBuilder());

    public static Context.Builder getContextBuilder() {
        String lib = System.getProperty("test.sulongtest.lib.path");
        return Context.newBuilder().allowAllAccess(true).allowExperimentalOptions(true).option(SulongEngineOption.LIBRARY_PATH_NAME, lib).option(SulongEngineOption.CXX_INTEROP_NAME, "true");
    }

    protected static final Path testBase = Paths.get(TestOptions.TEST_SUITE_PATH, "interop");
    public static final String TEST_FILE_NAME = "O1." + NativeContextExtension.getNativeLibrarySuffix();

    protected static Object loadTestBitcodeInternal(String name) {
        File file = Paths.get(testBase.toString(), name + BaseSuiteHarness.TEST_DIR_EXT, TEST_FILE_NAME).toFile();
        CallTarget target = getTestBitcodeCallTarget(file);
        return target.call();
    }

    protected static CallTarget getTestBitcodeCallTarget(File file) {
        TruffleFile tf = runWithPolyglot.getTruffleTestEnv().getPublicTruffleFile(file.toURI());
        try {
            Source source = Source.newBuilder("llvm", tf).build();
            return runWithPolyglot.getTruffleTestEnv().parsePublic(source);
        } catch (IOException ex) {
            throw new AssertionError(ex);
        }
    }

    protected static Value loadTestBitcodeValue(String name) {
        File file = Paths.get(testBase.toString(), name + BaseSuiteHarness.TEST_DIR_EXT, TEST_FILE_NAME).toFile();
        org.graalvm.polyglot.Source source;
        try {
            source = org.graalvm.polyglot.Source.newBuilder("llvm", file).build();
        } catch (IOException ex) {
            throw new AssertionError(ex);
        }
        return runWithPolyglot.getPolyglotContext().eval(source);
    }

    public static class SulongTestNode extends RootNode {

        private final Object function;
        @Child InteropLibrary interop;

        protected SulongTestNode(Object testLibrary, String fnName) {
            super(null);
            try {
                function = InteropLibrary.getFactory().getUncached().readMember(testLibrary, fnName);
            } catch (InteropException ex) {
                throw new AssertionError(ex);
            }
            this.interop = InteropLibrary.getFactory().create(function);
        }

        @Override
        public Object execute(VirtualFrame frame) {
            try {
                return interop.execute(function, frame.getArguments());
            } catch (InteropException ex) {
                throw new AssertionError(ex);
            }
        }
    }

}