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

import static com.oracle.graal.python.builtins.objects.itertools.TeeDataObjectBuiltins.LINKCELLS;
import static com.oracle.graal.python.builtins.PythonBuiltinClassType.TypeError;
import static com.oracle.graal.python.builtins.PythonBuiltinClassType.ValueError;
import static com.oracle.graal.python.nodes.ErrorMessages.INDEX_OUT_OF_RANGE;
import static com.oracle.graal.python.nodes.ErrorMessages.INTEGER_REQUIRED_GOT;
import static com.oracle.graal.python.nodes.ErrorMessages.IS_NOT_A;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__COPY__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__ITER__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__NEW__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__NEXT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__REDUCE__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__SETSTATE__;

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.PNone;
import com.oracle.graal.python.builtins.objects.object.PythonObject;
import com.oracle.graal.python.builtins.objects.tuple.PTuple;
import com.oracle.graal.python.builtins.objects.tuple.TupleBuiltins;
import com.oracle.graal.python.builtins.objects.tuple.TupleBuiltins.LenNode;
import com.oracle.graal.python.lib.PyObjectGetIter;
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.PythonBinaryBuiltinNode;
import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.graal.python.nodes.util.CannotCastException;
import com.oracle.graal.python.nodes.util.CastToJavaIntLossyNode;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateNodeFactory;
import com.oracle.truffle.api.dsl.ImportStatic;
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.ConditionProfile;

@CoreFunctions(extendClasses = {PythonBuiltinClassType.PTee})
public final class TeeBuiltins extends PythonBuiltins {

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

    @Builtin(name = __NEW__, minNumOfPositionalArgs = 2)
    @GenerateNodeFactory
    public abstract static class NewNode extends PythonBinaryBuiltinNode {
        @Specialization
        Object newTee(VirtualFrame frame, @SuppressWarnings("unused") Object cls, Object iterable,
                        @Cached PyObjectGetIter getIter,
                        @Cached("createCopyNode()") LookupAndCallUnaryNode copyNode,
                        @Cached ConditionProfile isTeeInstanceProfile) {
            Object it = getIter.execute(frame, iterable);
            if (isTeeInstanceProfile.profile(it instanceof PTee)) {
                return copyNode.executeObject(frame, it);
            } else {
                PTeeDataObject dataObj = factory().createTeeDataObject(it);
                return factory().createTee(dataObj, 0);
            }
        }

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

    @Builtin(name = __COPY__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class CopyNode extends PythonUnaryBuiltinNode {
        @Specialization
        Object copy(PTee self) {
            return factory().createTee(self.getDataobj(), self.getIndex());
        }
    }

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

    @ImportStatic(TeeDataObjectBuiltins.class)
    @Builtin(name = __NEXT__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class NextNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "self.getIndex() < LINKCELLS")
        Object next(VirtualFrame frame, PTee self,
                        @Cached BuiltinFunctions.NextNode nextNode) {
            Object value = self.getDataobj().getItem(frame, self.getIndex(), nextNode, this);
            self.setIndex(self.getIndex() + 1);
            return value;
        }

        @Specialization(guards = "self.getIndex() >= LINKCELLS")
        Object nextNext(VirtualFrame frame, PTee self,
                        @Cached BuiltinFunctions.NextNode nextNode) {
            self.setDataObj(self.getDataobj().jumplink(factory()));
            Object value = self.getDataobj().getItem(frame, 0, nextNode, this);
            self.setIndex(1);
            return value;
        }
    }

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

        @Specialization
        Object reduce(PTee self,
                        @Cached GetClassNode getClass) {
            // return type(self), ((),), (self.dataobj, self.index)
            Object type = getClass.execute(self);
            PTuple tuple1 = factory().createTuple(new Object[]{factory().createEmptyTuple()});
            PTuple tuple2 = factory().createTuple(new Object[]{self.getDataobj(), self.getIndex()});
            return factory().createTuple(new Object[]{type, tuple1, tuple2});
        }
    }

    @Builtin(name = __SETSTATE__, minNumOfPositionalArgs = 2)
    @GenerateNodeFactory
    public abstract static class SetStateNode extends PythonBinaryBuiltinNode {
        abstract Object execute(VirtualFrame frame, PythonObject self, Object state);

        @Specialization
        Object setState(VirtualFrame frame, PTee self, Object state,
                        @Cached LenNode lenNode,
                        @Cached TupleBuiltins.GetItemNode getItemNode,
                        @Cached CastToJavaIntLossyNode castToIntNode) {

            if (!(state instanceof PTuple) || (int) lenNode.execute(frame, state) != 2) {
                throw raise(TypeError, IS_NOT_A, "state", "2-tuple");
            }
            Object dataObject = getItemNode.execute(frame, state, 0);
            if (!(dataObject instanceof PTeeDataObject)) {
                throw raise(TypeError, IS_NOT_A, "state", "_tee_dataobject");
            }
            self.setDataObj((PTeeDataObject) dataObject);
            Object secondElement = getItemNode.execute(frame, state, 1);
            int index = 0;
            try {
                index = castToIntNode.execute(secondElement);
            } catch (CannotCastException e) {
                throw raise(TypeError, INTEGER_REQUIRED_GOT, secondElement);
            }
            if (index < 0 || index > LINKCELLS) {
                throw raise(ValueError, INDEX_OUT_OF_RANGE);
            }
            self.setIndex(index);
            return PNone.NONE;
        }
    }
}
