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

import static com.oracle.graal.python.builtins.PythonBuiltinClassType.AttributeError;
import static com.oracle.graal.python.nodes.SpecialMethodNames.T___AENTER__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.T___AEXIT__;

import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.type.SpecialMethodSlot;
import com.oracle.graal.python.nodes.PNodeWithContext;
import com.oracle.graal.python.nodes.PRaiseNode;
import com.oracle.graal.python.nodes.call.special.CallUnaryMethodNode;
import com.oracle.graal.python.nodes.call.special.LookupSpecialMethodSlotNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.truffle.api.dsl.Bind;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateInline;
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.frame.Frame;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.profiles.InlinedBranchProfile;

@GenerateUncached
@ImportStatic(SpecialMethodSlot.class)
@GenerateInline(false) // used in BCI root node
public abstract class SetupAwithNode extends PNodeWithContext {
    public abstract int execute(Frame frame, int stackTop);

    @Specialization
    static int setup(VirtualFrame frame, int stackTopIn,
                    @Bind("this") Node inliningTarget,
                    @Cached GetClassNode getClassNode,
                    @Cached(parameters = "AEnter") LookupSpecialMethodSlotNode lookupAEnter,
                    @Cached(parameters = "AExit") LookupSpecialMethodSlotNode lookupAExit,
                    @Cached CallUnaryMethodNode callEnter,
                    @Cached InlinedBranchProfile error1Profile,
                    @Cached InlinedBranchProfile error2Profile,
                    @Cached PRaiseNode raiseNode) {
        int stackTop = stackTopIn;
        Object contextManager = frame.getObject(stackTop);
        Object type = getClassNode.execute(inliningTarget, contextManager);
        Object enter = lookupAEnter.execute(frame, type, contextManager);
        if (enter == PNone.NO_VALUE) {
            error1Profile.enter(inliningTarget);
            throw raiseNode.raise(AttributeError, new Object[]{T___AENTER__});
        }
        Object exit = lookupAExit.execute(frame, type, contextManager);
        if (exit == PNone.NO_VALUE) {
            error2Profile.enter(inliningTarget);
            throw raiseNode.raise(AttributeError, new Object[]{T___AEXIT__});
        }
        Object res = callEnter.executeObject(frame, enter, contextManager);
        frame.setObject(++stackTop, exit);
        frame.setObject(++stackTop, res);
        return stackTop;
    }

    public static SetupAwithNode create() {
        return SetupAwithNodeGen.create();
    }

    public static SetupAwithNode getUncached() {
        return SetupAwithNodeGen.getUncached();
    }
}




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