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

import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.common.SequenceStorageNodes;
import com.oracle.graal.python.nodes.PGuards;
import com.oracle.graal.python.runtime.object.PythonObjectFactory;
import com.oracle.graal.python.util.PythonUtils;
import com.oracle.truffle.api.dsl.Cached;
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.nodes.Node;

@ImportStatic(PGuards.class)
@GenerateUncached
public abstract class BaseExceptionAttrNode extends Node {
    public interface StorageFactory {
        Object[] create(Object[] args, PythonObjectFactory factory);

        default Object[] create(Object[] args) {
            return create(args, null);
        }

        default Object[] create() {
            return create(null);
        }
    }

    public final Object get(PBaseException self, int index, StorageFactory factory) {
        return execute(self, PNone.NO_VALUE, index, factory);
    }

    public final int getInt(PBaseException self, int index, StorageFactory factory) {
        final Object val = execute(self, PNone.NO_VALUE, index, factory);
        assert val instanceof Integer : "expected PBaseException attribute to be an integer";
        return (int) val;
    }

    public final Object set(PBaseException self, Object value, int index, StorageFactory factory) {
        return execute(self, value, index, factory);
    }

    public abstract Object execute(PBaseException self, Object value, int index, StorageFactory factory);

    protected static boolean withAttributes(PBaseException self) {
        return self.getExceptionAttributes() != null;
    }

    private Object[] ensureAttrStorage(PBaseException self, StorageFactory factory, SequenceStorageNodes.GetInternalObjectArrayNode getArrayNode, PythonObjectFactory objectFactory) {
        Object[] attributes = self.getExceptionAttributes();
        if (attributes == null) {
            // TODO: cbasca should we raise in case getArgs() is null (due to lazy init of args)?
            Object[] args = PythonUtils.EMPTY_OBJECT_ARRAY;
            if (self.getArgs() != null) {
                args = getArrayNode.execute(self.getArgs().getSequenceStorage());
            }
            attributes = factory.create(args, objectFactory);
            self.setExceptionAttributes(attributes);
        }
        return attributes;
    }

    // GET
    @Specialization(guards = {"isNoValue(none)", "withAttributes(self)"})
    public Object getAttrWithStorage(PBaseException self, @SuppressWarnings("unused") PNone none, int index, @SuppressWarnings("unused") StorageFactory factory) {
        Object[] attributes = self.getExceptionAttributes();
        assert index >= 0 && index < attributes.length : "PBaseException attribute index is out of range";
        final Object value = attributes[index];
        return value != null ? value : PNone.NONE;
    }

    @Specialization(guards = {"isNoValue(none)", "!withAttributes(self)"})
    public Object getAttrNoStorage(PBaseException self, @SuppressWarnings("unused") PNone none, int index, StorageFactory factory,
                    @Cached SequenceStorageNodes.GetInternalObjectArrayNode getArrayNode,
                    @Cached PythonObjectFactory objectFactory) {
        Object[] attributes = ensureAttrStorage(self, factory, getArrayNode, objectFactory);
        assert attributes != null : "PBaseException attributes field is null";
        return getAttrWithStorage(self, none, index, factory);
    }

    // SET
    @Specialization(guards = {"!isNoValue(value)", "!isDeleteMarker(value)", "withAttributes(self)"})
    public Object setAttrWithStorage(PBaseException self, Object value, int index, @SuppressWarnings("unused") StorageFactory factory) {
        Object[] attributes = self.getExceptionAttributes();
        assert index >= 0 && index < attributes.length : "PBaseException attribute index is out of range";
        attributes[index] = value;
        return PNone.NONE;
    }

    @Specialization(guards = {"!isNoValue(value)", "!isDeleteMarker(value)", "!withAttributes(self)"})
    public Object setAttrNoStorage(PBaseException self, Object value, int index, StorageFactory factory,
                    @Cached SequenceStorageNodes.GetInternalObjectArrayNode getArrayNode,
                    @Cached PythonObjectFactory objectFactory) {
        Object[] attributes = ensureAttrStorage(self, factory, getArrayNode, objectFactory);
        assert attributes != null : "PBaseException attributes field is null";
        return setAttrWithStorage(self, value, index, factory);
    }

    // DEL
    @Specialization(guards = {"!isNoValue(value)", "isDeleteMarker(value)", "withAttributes(self)"})
    public Object delAttrWithStorage(PBaseException self, @SuppressWarnings("unused") Object value, int index, @SuppressWarnings("unused") StorageFactory factory) {
        Object[] attributes = self.getExceptionAttributes();
        assert index >= 0 && index < attributes.length : "PBaseException attribute index is out of range";
        attributes[index] = null;
        return PNone.NONE;
    }

    @Specialization(guards = {"!isNoValue(value)", "isDeleteMarker(value)", "!withAttributes(self)"})
    public Object delAttrNoStorage(PBaseException self, Object value, int index, StorageFactory factory,
                    @Cached SequenceStorageNodes.GetInternalObjectArrayNode getArrayNode,
                    @Cached PythonObjectFactory objectFactory) {
        Object[] attributes = ensureAttrStorage(self, factory, getArrayNode, objectFactory);
        assert attributes != null : "PBaseException attributes field is null";
        return delAttrWithStorage(self, value, index, factory);
    }
}
