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/*
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 * The Universal Permissive License (UPL), Version 1.0
 *
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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
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package org.pkl.thirdparty.truffle.polyglot;

import java.lang.reflect.Array;
import java.lang.reflect.Type;

import org.pkl.thirdparty.truffle.api.CompilerDirectives.TruffleBoundary;
import org.pkl.thirdparty.truffle.api.dsl.Bind;
import org.pkl.thirdparty.truffle.api.dsl.Cached;
import org.pkl.thirdparty.truffle.api.dsl.GenerateInline;
import org.pkl.thirdparty.truffle.api.dsl.Specialization;
import org.pkl.thirdparty.truffle.api.interop.ArityException;
import org.pkl.thirdparty.truffle.api.interop.InteropLibrary;
import org.pkl.thirdparty.truffle.api.interop.UnsupportedMessageException;
import org.pkl.thirdparty.truffle.api.interop.UnsupportedTypeException;
import org.pkl.thirdparty.truffle.api.library.CachedLibrary;
import org.pkl.thirdparty.truffle.api.nodes.Node;
import org.pkl.thirdparty.truffle.api.profiles.InlinedBranchProfile;
import org.pkl.thirdparty.truffle.api.profiles.InlinedConditionProfile;
import org.pkl.thirdparty.truffle.polyglot.PolyglotLanguageContext.ToGuestValuesNode;

@GenerateInline(false) // not much improvement in current uses, but field duplication
abstract class PolyglotExecuteNode extends Node {

    private static final Object[] EMPTY = new Object[0];

    public final Object execute(PolyglotLanguageContext languageContext, Object function, Object functionArgsObject) {
        return execute(languageContext, function, functionArgsObject, Object.class, Object.class, Object.class, null);
    }

    public final Object execute(PolyglotLanguageContext languageContext, Object function, Object functionArgsObject,
                    Class resultClass, Type resultType, Class paramClass, Type paramType) {
        // paramType == null => Default conversion of executable value or conversion to
        // unparameterized Function. We allow varargs-like invocation in this case.
        Object[] argsArray;
        if (paramType != null && paramClass.isArray()) {
            if (functionArgsObject == null) {
                argsArray = EMPTY;
            } else if (paramClass.getComponentType().isPrimitive() && !(functionArgsObject instanceof Object[])) {
                argsArray = copyToObjectArray(paramClass.cast(functionArgsObject));
            } else {
                argsArray = (Object[]) functionArgsObject;
            }
        } else {
            if (paramType == null && functionArgsObject == null) {
                argsArray = EMPTY;
            } else if (paramType == null && functionArgsObject instanceof Object[]) {
                argsArray = (Object[]) functionArgsObject;
            } else {
                argsArray = new Object[]{functionArgsObject};
            }
        }

        return executeImpl(languageContext, function, argsArray, resultClass, resultType);
    }

    @TruffleBoundary
    private static Object[] copyToObjectArray(Object functionArgs) {
        assert functionArgs.getClass().isArray();
        int length = Array.getLength(functionArgs);
        Object[] copy = new Object[length];
        for (int i = 0; i < length; i++) {
            copy[i] = Array.get(functionArgs, 0);
        }
        return copy;
    }

    protected abstract Object executeImpl(PolyglotLanguageContext languageContext, Object function, Object[] argsArray,
                    Class resultClass, Type resultType);

    @Specialization(limit = "5")
    static Object doCached(PolyglotLanguageContext languageContext, Object function, Object[] argsArray,
                    Class resultClass, Type resultType,
                    @Bind("this") Node node,
                    @CachedLibrary("function") InteropLibrary interop,
                    @Cached ToGuestValuesNode toGuests,
                    @Cached PolyglotToHostNode toHost,
                    @Cached InlinedConditionProfile executableCondition,
                    @Cached InlinedConditionProfile instantiableCondition,
                    @Cached InlinedBranchProfile unsupportedError,
                    @Cached InlinedBranchProfile arityError,
                    @Cached InlinedBranchProfile unsupportedArgumentError) {
        Object[] functionArgs = toGuests.execute(node, languageContext, argsArray);
        Object result;
        boolean executable = executableCondition.profile(node, interop.isExecutable(function));
        try {
            if (executable) {
                result = interop.execute(function, functionArgs);
            } else if (instantiableCondition.profile(node, interop.isInstantiable(function))) {
                result = interop.instantiate(function, functionArgs);
            } else {
                throw PolyglotInteropErrors.executeUnsupported(languageContext, function);
            }
        } catch (UnsupportedTypeException e) {
            unsupportedArgumentError.enter(node);
            if (executable) {
                throw PolyglotInteropErrors.invalidExecuteArgumentType(languageContext, function, functionArgs);
            } else {
                throw PolyglotInteropErrors.invalidInstantiateArgumentType(languageContext, function, functionArgs);
            }
        } catch (ArityException e) {
            arityError.enter(node);
            if (executable) {
                throw PolyglotInteropErrors.invalidExecuteArity(languageContext, function, functionArgs, e.getExpectedMinArity(), e.getExpectedMaxArity(), e.getActualArity());
            } else {
                throw PolyglotInteropErrors.invalidInstantiateArity(languageContext, function, functionArgs, e.getExpectedMinArity(), e.getExpectedMaxArity(),
                                e.getActualArity());
            }
        } catch (UnsupportedMessageException e) {
            unsupportedError.enter(node);
            throw PolyglotInteropErrors.executeUnsupported(languageContext, function);
        }
        return toHost.execute(node, languageContext, result, resultClass, resultType);
    }

}