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/*
 * Copyright (c) 2017, 2023, 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.nodes.attributes;

import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.nodes.PNodeWithContext;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateCached;
import com.oracle.truffle.api.dsl.GenerateInline;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.api.strings.TruffleString;

public final class LookupInheritedAttributeNode extends PNodeWithContext {

    @Child private LookupAttributeInMRONode lookupInMRONode;
    @Child private GetClassNode getClassNode = GetClassNode.create();

    private LookupInheritedAttributeNode(TruffleString key) {
        lookupInMRONode = LookupAttributeInMRONode.create(key);
    }

    @NeverDefault
    public static LookupInheritedAttributeNode create(TruffleString key) {
        return new LookupInheritedAttributeNode(key);
    }

    @Override
    public NodeCost getCost() {
        // super-simple wrapper node
        return NodeCost.NONE;
    }

    /**
     * Looks up the {@code key} in the MRO of the Python type of the {@code object}.
     *
     * @return The lookup result, or {@link PNone#NO_VALUE} if the key isn't inherited by the
     *         object.
     */
    public Object execute(Object object) {
        return lookupInMRONode.execute(getClassNode.executeCached(object));
    }

    @GenerateUncached
    @GenerateInline
    @GenerateCached(false)
    public abstract static class Dynamic extends Node {
        public static Object executeUncached(Object object, TruffleString key) {
            return LookupInheritedAttributeNodeFactory.DynamicNodeGen.getUncached().execute(null, object, key);
        }

        public abstract Object execute(Node inliningTarget, Object object, TruffleString key);

        @Specialization
        static Object doCached(Node inliningTarget, Object object, TruffleString key,
                        @Cached GetClassNode getClassNode,
                        @Cached(inline = false) LookupAttributeInMRONode.Dynamic lookupAttrInMroNode) {

            return lookupAttrInMroNode.execute(getClassNode.execute(inliningTarget, object), key);
        }
    }
}