/*
 * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.oracle.graal.python.builtins.objects.cext.capi;

import com.oracle.graal.python.builtins.objects.PythonAbstractObject;
import com.oracle.graal.python.builtins.objects.cext.capi.CExtNodes.GetNativeNullNode;
import com.oracle.graal.python.builtins.objects.cext.capi.CExtNodes.IsPointerNode;
import com.oracle.graal.python.builtins.objects.cext.capi.CExtNodes.ToSulongNode;
import com.oracle.graal.python.builtins.objects.cext.capi.DynamicObjectNativeWrapper.PAsPointerNode;
import com.oracle.graal.python.builtins.objects.cext.capi.DynamicObjectNativeWrapper.ToPyObjectNode;
import com.oracle.graal.python.builtins.objects.exception.PBaseException;
import com.oracle.graal.python.builtins.objects.traceback.GetTracebackNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Exclusive;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.library.ExportLibrary;
import com.oracle.truffle.api.library.ExportMessage;
import com.oracle.truffle.llvm.spi.NativeTypeLibrary;

/**
 * Emulates {@code _PyErr_StackItem}.
 */
@ExportLibrary(InteropLibrary.class)
@ExportLibrary(value = NativeTypeLibrary.class, useForAOT = false)
public final class PyErrStackItem extends PythonNativeWrapper {

    public static final String EXC_TYPE = "exc_type";
    public static final String EXC_VALUE = "exc_value";
    public static final String EXC_TRACEBACK = "exc_traceback";
    public static final String PREVIOUS_ITEM = "previous_item";

    private final PBaseException exception;

    public PyErrStackItem(PBaseException exception) {
        this.exception = exception;
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    boolean hasMembers() {
        return true;
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    Object getMembers(@SuppressWarnings("unused") boolean includeInternal) {
        return new PythonAbstractObject.Keys(new Object[]{EXC_TYPE, EXC_VALUE, EXC_TRACEBACK, PREVIOUS_ITEM});
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    boolean isMemberReadable(String key) {
        return EXC_TYPE.equals(key) || EXC_VALUE.equals(key) || EXC_TRACEBACK.equals(key) || PREVIOUS_ITEM.equals(key);
    }

    @ExportMessage
    Object readMember(String key,
                    @Cached GetClassNode getClassNode,
                    @Cached GetTracebackNode getTracebackNode,
                    @Cached GetNativeNullNode getNativeNullNode,
                    @Cached ToSulongNode toSulongNode) {
        Object result = null;
        if (exception != null) {
            switch (key) {
                case EXC_TYPE:
                    result = getClassNode.execute(exception);
                    break;
                case EXC_VALUE:
                    result = exception;
                    break;
                case EXC_TRACEBACK:
                    if (exception.getTraceback() != null) {
                        result = getTracebackNode.execute(exception.getTraceback());
                    }
                    break;
            }
        }
        if (result == null) {
            result = getNativeNullNode.execute();
        }
        return toSulongNode.execute(result);
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    protected boolean hasNativeType() {
        // TODO implement native type
        return false;
    }

    @ExportMessage
    @SuppressWarnings("static-method")
    Object getNativeType() {
        // TODO implement native type
        return null;
    }

    @ExportMessage
    boolean isPointer(
                    @Cached IsPointerNode isPointerNode) {
        return isPointerNode.execute(this);
    }

    @ExportMessage
    long asPointer(
                    @Exclusive @Cached PAsPointerNode pAsPointerNode) {
        return pAsPointerNode.execute(this);
    }

    @ExportMessage
    void toNative(
                    @Exclusive @Cached ToPyObjectNode toPyObjectNode,
                    @Exclusive @Cached InvalidateNativeObjectsAllManagedNode invalidateNode) {
        invalidateNode.execute();
        setNativePointer(toPyObjectNode.execute(this));
    }
}
