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

import static com.oracle.graal.python.nodes.SpecialMethodNames.__CONTAINS__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__INIT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__ITER__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__NEXT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.__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.objects.PNone;
import com.oracle.graal.python.builtins.objects.function.PKeyword;
import com.oracle.graal.python.builtins.objects.tuple.PTuple;
import com.oracle.graal.python.lib.PyObjectGetIter;
import com.oracle.graal.python.lib.PyObjectRichCompareBool;
import com.oracle.graal.python.nodes.call.special.CallVarargsMethodNode;
import com.oracle.graal.python.nodes.control.GetNextNode;
import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
import com.oracle.graal.python.nodes.function.PythonBuiltinNode;
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.IsBuiltinClassProfile;
import com.oracle.graal.python.runtime.exception.PException;
import com.oracle.graal.python.util.PythonUtils;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Shared;
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.PMap)
public final class MapBuiltins extends PythonBuiltins {

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

    @Builtin(name = __INIT__, minNumOfPositionalArgs = 3, takesVarArgs = true)
    @GenerateNodeFactory
    public abstract static class InitNode extends PythonBuiltinNode {
        @Specialization(guards = "args.length == 0")
        static PNone doOne(VirtualFrame frame, PMap self, Object func, Object iterable, @SuppressWarnings("unused") Object[] args,
                        @Shared("getIter") @Cached PyObjectGetIter getIter) {
            self.setFunction(func);
            self.setIterators(new Object[]{getIter.execute(frame, iterable)});
            return PNone.NONE;
        }

        @Specialization(replaces = "doOne")
        static PNone doGeneric(VirtualFrame frame, PMap self, Object func, Object iterable, Object[] args,
                        @Shared("getIter") @Cached PyObjectGetIter getIter) {
            self.setFunction(func);
            Object[] iterators = new Object[args.length + 1];
            iterators[0] = getIter.execute(frame, iterable);
            for (int i = 0; i < args.length; i++) {
                iterators[i + 1] = getIter.execute(frame, args[i]);
            }
            self.setIterators(iterators);
            return PNone.NONE;
        }
    }

    @Builtin(name = __NEXT__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class NextNode extends PythonUnaryBuiltinNode {
        @Specialization(guards = "self.getIterators().length == 1")
        Object doOne(VirtualFrame frame, PMap self,
                        @Cached CallVarargsMethodNode callNode,
                        @Cached GetNextNode next) {
            return callNode.execute(frame, self.getFunction(), new Object[]{next.execute(frame, self.getIterators()[0])}, PKeyword.EMPTY_KEYWORDS);
        }

        @Specialization(replaces = "doOne")
        Object doNext(VirtualFrame frame, PMap self,
                        @Cached CallVarargsMethodNode callNode,
                        @Cached GetNextNode next) {
            Object[] iterators = self.getIterators();
            Object[] arguments = new Object[iterators.length];
            for (int i = 0; i < iterators.length; i++) {
                arguments[i] = next.execute(frame, iterators[i]);
            }
            return callNode.execute(frame, self.getFunction(), arguments, PKeyword.EMPTY_KEYWORDS);
        }
    }

    @Builtin(name = __ITER__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class IterNode extends PythonUnaryBuiltinNode {

        @Specialization
        static PMap iter(PMap self) {
            return self;
        }
    }

    @Builtin(name = __CONTAINS__, minNumOfPositionalArgs = 2)
    @GenerateNodeFactory
    public abstract static class ContainsNode extends PythonBinaryBuiltinNode {
        @Specialization
        boolean doit(VirtualFrame frame, PMap self, Object x,
                        @Cached BranchProfile moreThanOne,
                        @Cached PyObjectRichCompareBool.EqNode eqNode,
                        @Cached PyObjectGetIter getIter,
                        @Cached GetNextNode next,
                        @Cached IsBuiltinClassProfile profile) {
            PMap iterMap = factory().createMap(PythonBuiltinClassType.PMap);
            Object[] iterators = self.getIterators();
            Object iterator = iterators[0];
            Object[] args;
            if (iterators.length > 1) {
                moreThanOne.enter();
                args = new Object[iterators.length - 1];
                PythonUtils.arraycopy(iterators, 1, args, 0, args.length);
            } else {
                args = PythonUtils.EMPTY_OBJECT_ARRAY;
            }
            InitNode.doGeneric(frame, iterMap, self.getFunction(), iterator, args, getIter);
            while (true) {
                try {
                    Object n = next.execute(frame, iterMap);
                    if (eqNode.execute(frame, n, x)) {
                        return true;
                    }
                } catch (PException e) {
                    e.expectStopIteration(profile);
                    break;
                }
            }
            return false;
        }
    }

    @Builtin(name = __REDUCE__, minNumOfPositionalArgs = 1, maxNumOfPositionalArgs = 2)
    @GenerateNodeFactory
    public abstract static class ReduceNode extends PythonBuiltinNode {
        @Specialization
        PTuple doit(PMap self, @SuppressWarnings("unused") Object ignored) {
            Object[] iterators = self.getIterators();
            Object[] args = new Object[iterators.length + 1];
            args[0] = self.getFunction();
            System.arraycopy(iterators, 0, args, 1, iterators.length);
            return factory().createTuple(new Object[]{PythonBuiltinClassType.PMap, factory().createTuple(args)});
        }
    }
}
