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

import static com.oracle.graal.python.nodes.BuiltinNames.T_ITER;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___ITER__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___NEXT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___REDUCE__;

import java.util.List;

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;
import com.oracle.graal.python.builtins.objects.module.PythonModule;
import com.oracle.graal.python.builtins.objects.tuple.PTuple;
import com.oracle.graal.python.lib.PyObjectGetAttr;
import com.oracle.graal.python.lib.PyObjectRichCompareBool;
import com.oracle.graal.python.nodes.BuiltinNames;
import com.oracle.graal.python.nodes.call.CallNode;
import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
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;
import com.oracle.truffle.api.profiles.ConditionProfile;

@CoreFunctions(extendClasses = {PythonBuiltinClassType.PGrouper})
public final class GrouperBuiltins extends PythonBuiltins {

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

    @Builtin(name = J___ITER__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class IterNode extends PythonUnaryBuiltinNode {
        @Specialization
        static Object iter(PGrouper self) {
            return self;
        }
    }

    @Builtin(name = J___NEXT__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class NextNode extends PythonUnaryBuiltinNode {
        @Specialization
        Object next(VirtualFrame frame, PGrouper self,
                        @Cached BuiltinFunctions.NextNode nextNode,
                        @Cached CallNode callNode,
                        @Cached PyObjectRichCompareBool.EqNode eqNode,
                        @Cached BranchProfile currGrouperProfile,
                        @Cached BranchProfile currValueMarkerProfile,
                        @Cached BranchProfile currValueTgtProfile,
                        @Cached ConditionProfile hasFuncProfile) {
            PGroupBy gbo = self.getParent();
            if (gbo.getCurrGrouper() != self) {
                currGrouperProfile.enter();
                throw raiseStopIteration();
            }
            if (gbo.getCurrValue() == null) {
                currValueMarkerProfile.enter();
                gbo.groupByStep(frame, nextNode, callNode, hasFuncProfile);
            }
            if (!eqNode.execute(frame, self.getTgtKey(), gbo.getCurrKey())) {
                currValueTgtProfile.enter();
                throw raiseStopIteration();
            }
            Object r = gbo.getCurrValue();
            gbo.setCurrValue(null);
            return r;
        }
    }

    @Builtin(name = J___REDUCE__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class ReduceNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "currValueIsSelf(self)")
        Object reduce(PGrouper self,
                        @Cached GetClassNode getClassNode) {
            Object type = getClassNode.execute(self);
            PTuple tuple = factory().createTuple(new Object[]{self.getParent(), self.getTgtKey()});
            return factory().createTuple(new Object[]{type, tuple});
        }

        @Specialization(guards = "!currValueIsSelf(self)")
        Object reduceCurrNotSelf(VirtualFrame frame, @SuppressWarnings("unused") PGrouper self,
                        @Cached PyObjectGetAttr getAttrNode) {
            PythonModule builtins = getContext().getCore().lookupBuiltinModule(BuiltinNames.T_BUILTINS);
            Object iterCallable = getAttrNode.execute(frame, builtins, T_ITER);
            // return Py_BuildValue("N(())", _PyEval_GetBuiltinId(&PyId_iter));
            return factory().createTuple(new Object[]{iterCallable, factory().createTuple(new Object[]{factory().createEmptyTuple()})});
        }

        protected boolean currValueIsSelf(PGrouper self) {
            return self.getParent().getCurrGrouper() == self;
        }
    }
}
