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package com.oracle.graal.python.builtins.objects.itertools;

import static com.oracle.graal.python.builtins.PythonBuiltinClassType.ValueError;
import static com.oracle.graal.python.builtins.PythonBuiltinClassType.TypeError;
import static com.oracle.graal.python.nodes.ErrorMessages.ARG_D_MUST_BE_S_NOT_P;
import static com.oracle.graal.python.nodes.ErrorMessages.S_MUST_BE_S;
import static com.oracle.graal.python.nodes.ErrorMessages.TDATAOBJECT_SHOULDNT_HAVE_NEXT;
import static com.oracle.graal.python.nodes.ErrorMessages.TDATAOBJECT_SHOULD_NOT_HAVE_MORE_LINKS;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__COPY__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__INIT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__REDUCE__;

import java.util.List;

import com.oracle.graal.python.annotations.ArgumentClinic;
import com.oracle.graal.python.builtins.Builtin;
import com.oracle.graal.python.builtins.CoreFunctions;
import com.oracle.graal.python.builtins.PythonBuiltinClassType;
import com.oracle.graal.python.builtins.PythonBuiltins;
import com.oracle.graal.python.builtins.modules.BuiltinFunctions.LenNode;
import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.common.SequenceNodes.GetSequenceStorageNode;
import com.oracle.graal.python.builtins.objects.list.PList;
import com.oracle.graal.python.builtins.objects.object.PythonObject;
import com.oracle.graal.python.builtins.objects.tuple.PTuple;
import com.oracle.graal.python.nodes.call.special.LookupAndCallUnaryNode;
import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
import com.oracle.graal.python.nodes.function.builtins.PythonQuaternaryClinicBuiltinNode;
import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;
import com.oracle.graal.python.nodes.function.builtins.clinic.ArgumentClinicProvider;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.graal.python.util.PythonUtils;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateNodeFactory;
import com.oracle.truffle.api.dsl.NodeFactory;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.profiles.BranchProfile;

@CoreFunctions(extendClasses = {PythonBuiltinClassType.PTeeDataObject})
public final class TeeDataObjectBuiltins extends PythonBuiltins {

    static final int LINKCELLS = 128;

    @Override
    protected List<? extends NodeFactory<? extends PythonBuiltinBaseNode>> getNodeFactories() {
        return TeeDataObjectBuiltinsFactory.getFactories();
    }

    @Builtin(name = __INIT__, minNumOfPositionalArgs = 1, parameterNames = {"$self", "it", "values", "nxt"})
    @ArgumentClinic(name = "values", defaultValue = "PNone.NONE", useDefaultForNone = true)
    @ArgumentClinic(name = "nxt", defaultValue = "PNone.NONE", useDefaultForNone = true)
    @GenerateNodeFactory
    public abstract static class InitNode extends PythonQuaternaryClinicBuiltinNode {

        @Override
        protected ArgumentClinicProvider getArgumentClinic() {
            return TeeDataObjectBuiltinsClinicProviders.InitNodeClinicProviderGen.INSTANCE;
        }

        abstract Object execute(VirtualFrame frame, PTeeDataObject self, Object it, Object values, Object nxt);

        @Specialization(guards = "isNone(values)")
        Object init(PTeeDataObject self, Object it, @SuppressWarnings("unused") Object values, @SuppressWarnings("unused") PNone nxt) {
            init(self, it, null);
            return PNone.NONE;
        }

        @Specialization(guards = "isNone(values)")
        Object init(PTeeDataObject self, Object it, @SuppressWarnings("unused") Object values, PTeeDataObject nxt) {
            init(self, it, nxt);
            return PNone.NONE;
        }

        private static void init(PTeeDataObject self, Object it, PTeeDataObject nxt) {
            self.setIt(it);
            self.setValues(new Object[LINKCELLS]);
            self.setNumread(0);
            self.setRunning(false);
            self.setNextlink(nxt);
        }

        @Specialization(guards = "isList(values)")
        Object init(VirtualFrame frame, PTeeDataObject self, Object it, PList values, Object nxt,
                        @Cached LenNode lenNode,
                        @Cached GetSequenceStorageNode getStorageNode,
                        @Cached BranchProfile numreadLCProfile) {
            int numread = (int) lenNode.execute(frame, values);
            if (numread == LINKCELLS) {
                numreadLCProfile.enter();
                if (!(nxt instanceof PTeeDataObject)) {
                    throw raise(ValueError, S_MUST_BE_S, "_tee_dataobject next link", "_tee_dataobject");
                }
            } else if (numread > LINKCELLS) {
                throw raise(ValueError, TDATAOBJECT_SHOULD_NOT_HAVE_MORE_LINKS, LINKCELLS);
            } else if (!(nxt instanceof PNone)) {
                throw raise(ValueError, TDATAOBJECT_SHOULDNT_HAVE_NEXT);
            }
            self.setIt(it);
            Object[] valuesArray = getStorageNode.execute(values).getInternalArray();
            Object[] obj = new Object[LINKCELLS];
            PythonUtils.arraycopy(valuesArray, 0, obj, 0, numread);
            self.setValues(obj);
            self.setNumread(numread);
            self.setRunning(false);
            self.setNextlink(nxt == PNone.NONE ? null : (PTeeDataObject) nxt);
            return PNone.NONE;
        }

        @SuppressWarnings("unused")
        @Specialization(guards = {"!isList(values)", "!isNone(values)"})
        Object init(VirtualFrame frame, PTeeDataObject self, Object it, Object values, Object nxt) {
            throw raise(TypeError, ARG_D_MUST_BE_S_NOT_P, "teedataobject()", 2, "list", values);
        }

        protected LookupAndCallUnaryNode createCopyNode() {
            return LookupAndCallUnaryNode.create(__COPY__);
        }
    }

    @Builtin(name = __REDUCE__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class ReduceNode extends PythonUnaryBuiltinNode {
        abstract Object execute(VirtualFrame frame, PythonObject self);

        @Specialization
        Object reduce(PTeeDataObject self,
                        @Cached GetClassNode getClass) {
            int numread = self.getNumread();
            Object[] values = new Object[numread];
            PythonUtils.arraycopy(self.getValues(), 0, values, 0, numread);
            Object type = getClass.execute(self);
            Object nextlink = self.getNextlink();
            PTuple tuple = factory().createTuple(new Object[]{self.getIt(), factory().createList(values), nextlink == null ? PNone.NONE : nextlink});
            return factory().createTuple(new Object[]{type, tuple});
        }
    }
}
