/*
 * Copyright (c) 2017, 2020, Oracle and/or its affiliates.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.oracle.truffle.llvm.parser.metadata;

import com.oracle.truffle.llvm.parser.model.symbols.constants.Constant;
import com.oracle.truffle.llvm.parser.model.visitors.SymbolVisitor;
import com.oracle.truffle.llvm.runtime.CommonNodeFactory;
import com.oracle.truffle.llvm.runtime.GetStackSpaceFactory;
import com.oracle.truffle.llvm.runtime.datalayout.DataLayout;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.types.MetaType;
import com.oracle.truffle.llvm.runtime.types.Type;
import com.oracle.truffle.llvm.parser.LLVMParserRuntime;
import com.oracle.truffle.llvm.parser.model.SymbolImpl;

public final class MetadataSymbol implements Constant {

    private MDBaseNode node;

    private MetadataSymbol() {
        this.node = MDVoidNode.INSTANCE;
    }

    @Override
    public Type getType() {
        return MetaType.METADATA;
    }

    public MDBaseNode getNode() {
        return node;
    }

    @Override
    public void replace(SymbolImpl oldValue, SymbolImpl newValue) {

    }

    @Override
    public void accept(SymbolVisitor visitor) {
        visitor.visit(this);
    }

    public static MetadataSymbol create(MetadataValueList md, int index) {
        final MetadataSymbol symbol = new MetadataSymbol();
        md.onParse(index, mdNode -> {
            symbol.node = mdNode;
        });
        return symbol;
    }

    private static final class CollectMetadataVisitor implements MetadataVisitor {

        LLVMExpressionNode resolvedNode;

        @Override
        public void visit(MDString md) {
            resolvedNode = CommonNodeFactory.createLiteral(md.getString(), MetaType.UNKNOWN);
        }

        @Override
        public void defaultAction(MDBaseNode v) {
            resolvedNode = CommonNodeFactory.createLiteral(null, MetaType.UNKNOWN);
        }
    }

    @Override
    public LLVMExpressionNode createNode(LLVMParserRuntime runtime, DataLayout dataLayout, GetStackSpaceFactory stackFactory) {
        CollectMetadataVisitor visitor = new CollectMetadataVisitor();
        node.accept(visitor);
        return visitor.resolvedNode;
    }
}