/*
 * Copyright (C) 2019 Apple Inc. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
 */

#pragma once

#if ENABLE(WEBGPU)

#include "WHLSLLexer.h"
#include "WHLSLNamedType.h"
#include "WHLSLTypeArgument.h"
#include "WHLSLUnnamedType.h"
#include <wtf/UniqueRef.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

namespace WHLSL {

namespace AST {

class NamedType;

class TypeReference : public UnnamedType {
public:
    TypeReference(CodeLocation location, String&& name, TypeArguments&& typeArguments)
        : UnnamedType(location)
        , m_name(WTFMove(name))
        , m_typeArguments(WTFMove(typeArguments))
    {
    }

    virtual ~TypeReference() = default;

    TypeReference(const TypeReference&) = delete;
    TypeReference(TypeReference&&) = default;

    static UniqueRef<TypeReference> wrap(CodeLocation, NamedType& resolvedType);

    bool isTypeReference() const override { return true; }

    String& name() { return m_name; }
    TypeArguments& typeArguments() { return m_typeArguments; }
    NamedType* maybeResolvedType() const { return m_resolvedType; }
    NamedType& resolvedType() const
    {
        ASSERT(m_resolvedType);
        return *m_resolvedType;
    }

    const Type& unifyNode() const override
    {
        ASSERT(m_resolvedType);
        return m_resolvedType->unifyNode();
    }

    Type& unifyNode() override
    {
        ASSERT(m_resolvedType);
        return m_resolvedType->unifyNode();
    }

    void setResolvedType(NamedType& resolvedType)
    {
        m_resolvedType = &resolvedType;
    }

    UniqueRef<TypeReference> cloneTypeReference() const
    {
        auto result = makeUniqueRef<TypeReference>(codeLocation(), String(m_name), AST::clone(m_typeArguments));
        if (m_resolvedType)
            result->setResolvedType(*m_resolvedType);
        return result;
    }

    UniqueRef<UnnamedType> clone() const override
    {
        return cloneTypeReference();
    }

    unsigned hash() const override
    {
        // Currently, we only use this function after the name resolver runs.
        // Relying on having a resolved type simplifies this implementation.
        ASSERT(m_resolvedType);
        return WTF::PtrHash<const Type*>::hash(&unifyNode());
    }

    bool operator==(const UnnamedType& other) const override
    {
        ASSERT(m_resolvedType);
        if (!is<TypeReference>(other))
            return false;

        return &unifyNode() == &downcast<TypeReference>(other).unifyNode();
    }

private:
    String m_name;
    TypeArguments m_typeArguments;
    NamedType* m_resolvedType { nullptr };
};

} // namespace AST

}

}

SPECIALIZE_TYPE_TRAITS_WHLSL_UNNAMED_TYPE(TypeReference, isTypeReference())

#endif
