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package com.oracle.graal.python.nodes.expression;

import static com.oracle.graal.python.runtime.exception.PythonErrorType.TypeError;

import com.oracle.graal.python.PythonLanguage;
import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.function.PArguments;
import com.oracle.graal.python.builtins.objects.function.Signature;
import com.oracle.graal.python.nodes.ErrorMessages;
import com.oracle.graal.python.nodes.PRaiseNode;
import com.oracle.graal.python.nodes.SpecialMethodNames;
import com.oracle.graal.python.nodes.call.special.LookupAndCallTernaryNode;
import com.oracle.graal.python.nodes.call.special.LookupAndCallTernaryNode.NotImplementedHandler;
import com.oracle.graal.python.util.Supplier;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;

public enum TernaryArithmetic {
    Pow(SpecialMethodNames.__POW__, "**", "pow");

    private final String methodName;
    private final String operator;
    private final Supplier<NotImplementedHandler> notImplementedHandler;

    TernaryArithmetic(String methodName, String operator, String operatorFunction) {
        this.methodName = methodName;
        this.operator = operator;
        this.notImplementedHandler = () -> new NotImplementedHandler() {
            @Child private PRaiseNode raiseNode = PRaiseNode.create();

            @Override
            public Object execute(Object arg, Object arg2, Object arg3) {
                if (arg3 instanceof PNone) {
                    throw raiseNode.raise(TypeError, ErrorMessages.UNSUPPORTED_OPERAND_TYPES_FOR_S_PR_S_P_AND_P, operator, operatorFunction, arg, arg2);
                } else {
                    throw raiseNode.raise(TypeError, ErrorMessages.UNSUPPORTED_OPERAND_TYPES_FOR_S_P_P_P, operatorFunction, arg, arg2, arg3);
                }
            }
        };
    }

    public String getMethodName() {
        return methodName;
    }

    public String getOperator() {
        return operator;
    }

    /**
     * A helper root node that dispatches to {@link LookupAndCallTernaryNode} to execute the
     * provided ternary operator. This node is mostly useful to use such operators from a location
     * without a frame (e.g. from interop). Note: this is just a root node and won't do any
     * signature checking.
     */
    static final class CallTernaryArithmeticRootNode extends CallArithmeticRootNode {
        static final Signature SIGNATURE_TERNARY = new Signature(3, false, -1, false, new String[]{"x", "y", "z"}, null);

        @Child private LookupAndCallTernaryNode callTernaryNode;

        private final TernaryArithmetic ternaryOperator;

        private CallTernaryArithmeticRootNode(PythonLanguage language, TernaryArithmetic ternaryOperator) {
            super(language);
            this.ternaryOperator = ternaryOperator;
        }

        @Override
        public Signature getSignature() {
            return SIGNATURE_TERNARY;
        }

        @Override
        protected Object doCall(VirtualFrame frame) {
            if (callTernaryNode == null) {
                CompilerDirectives.transferToInterpreterAndInvalidate();
                callTernaryNode = insert(ternaryOperator.create());
            }
            return callTernaryNode.execute(frame, PArguments.getArgument(frame, 0), PArguments.getArgument(frame, 1), PArguments.getArgument(frame, 2));
        }
    }

    public LookupAndCallTernaryNode create() {
        return LookupAndCallTernaryNode.createReversible(methodName, notImplementedHandler);
    }

    /**
     * Creates a root node for this ternary operator such that the operator can be executed via a
     * full call.
     */
    public RootNode createRootNode(PythonLanguage language) {
        return new CallTernaryArithmeticRootNode(language, this);
    }
}
