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

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

import com.oracle.graal.python.builtins.modules.MathGuards;
import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.ints.PInt;
import com.oracle.graal.python.nodes.ErrorMessages;
import com.oracle.graal.python.nodes.PNodeWithContext;
import com.oracle.graal.python.nodes.PRaiseNode;
import com.oracle.graal.python.nodes.call.special.LookupAndCallUnaryNode;
import com.oracle.graal.python.nodes.call.special.LookupAndCallUnaryNode.LookupAndCallUnaryDynamicNode;
import com.oracle.graal.python.nodes.truffle.PythonArithmeticTypes;
import com.oracle.graal.python.nodes.util.CoerceToJavaLongNodeGen.CoerceToJavaLongExactNodeGen;
import com.oracle.graal.python.nodes.util.CoerceToJavaLongNodeGen.CoerceToJavaLongLossyNodeGen;
import com.oracle.graal.python.util.OverflowException;
import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.dsl.TypeSystemReference;

@TypeSystemReference(PythonArithmeticTypes.class)
@ImportStatic(MathGuards.class)
public abstract class CoerceToJavaLongNode extends PNodeWithContext {

    public abstract long execute(Object x);

    protected long toLongInternal(@SuppressWarnings("unused") PInt x) {
        CompilerAsserts.neverPartOfCompilation();
        throw new IllegalStateException("should not be reached");
    }

    public static CoerceToJavaLongNode create() {
        return CoerceToJavaLongExactNodeGen.create();
    }

    public static CoerceToJavaLongNode createLossy() {
        return CoerceToJavaLongLossyNodeGen.create();
    }

    public static CoerceToJavaLongNode getUncached() {
        return CoerceToJavaLongExactNodeGen.getUncached();
    }

    public static CoerceToJavaLongNode createLossyUncached() {
        return CoerceToJavaLongLossyNodeGen.getUncached();
    }

    @Specialization
    public static long toLong(long x) {
        return x;
    }

    @Specialization
    public long toLong(PInt x) {
        return toLongInternal(x);
    }

    @Specialization(guards = "!isNumber(x)")
    public long toLong(Object x,
                    @Cached PRaiseNode raise,
                    @Cached("create(Int)") LookupAndCallUnaryNode callIntNode) {
        Object result = callIntNode.executeObject(null, x);
        return toLong(x, raise, result);
    }

    @TruffleBoundary
    @Specialization(guards = "!isNumber(x)", replaces = "toLong")
    public long toLongUncached(Object x) {
        Object result = LookupAndCallUnaryDynamicNode.getUncached().executeObject(x, __INT__);
        return CoerceToJavaLongNode.this.toLong(x, PRaiseNode.getUncached(), result);
    }

    private long toLong(Object x, PRaiseNode raise, Object result) {
        if (result == PNone.NO_VALUE) {
            throw raise.raise(TypeError, ErrorMessages.MUST_BE_NUMERIC, x);
        }
        if (result instanceof PInt) {
            return toLongInternal((PInt) result);
        }
        if (result instanceof Integer) {
            return ((Integer) result).longValue();
        }
        if (result instanceof Long) {
            return (long) result;
        }
        throw raise.raise(TypeError, ErrorMessages.RETURNED_NON_LONG, x, "__int__", result);
    }

    @GenerateUncached
    abstract static class CoerceToJavaLongLossyNode extends CoerceToJavaLongNode {
        @Override
        protected long toLongInternal(PInt x) {
            return x.longValue();
        }
    }

    @GenerateUncached
    abstract static class CoerceToJavaLongExactNode extends CoerceToJavaLongNode {
        @Override
        protected long toLongInternal(PInt x) {
            try {
                return x.longValueExact();
            } catch (OverflowException e) {
                CompilerDirectives.transferToInterpreter();
                throw PRaiseNode.getUncached().raise(TypeError, ErrorMessages.CANNOT_BE_INTEPRETED_AS_LONG, x);
            }
        }
    }
}
