//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_USD_PCP_SITE_H
#define PXR_USD_PCP_SITE_H

#include "pxr/pxr.h"
#include "pxr/usd/pcp/api.h"
#include "pxr/usd/pcp/layerStackIdentifier.h"
#include "pxr/usd/sdf/path.h"
#include "pxr/usd/sdf/types.h"
#include "pxr/base/tf/declarePtrs.h"

#include <boost/operators.hpp>
#include <iosfwd>

PXR_NAMESPACE_OPEN_SCOPE

TF_DECLARE_WEAK_AND_REF_PTRS(PcpLayerStack);
class PcpLayerStackSite;

/// \class PcpSite
///
/// A site specifies a path in a layer stack of scene description.
///
class PcpSite : boost::totally_ordered<PcpSite> 
{
public:
    PcpLayerStackIdentifier layerStackIdentifier;
    SdfPath path;

    PCP_API
    PcpSite();

    PCP_API
    PcpSite( const PcpLayerStackIdentifier &, const SdfPath & path );
    PCP_API
    PcpSite( const PcpLayerStackPtr &, const SdfPath & path );
    PCP_API
    PcpSite( const SdfLayerHandle &, const SdfPath & path );
    PCP_API
    explicit PcpSite( const PcpLayerStackSite & );

    PCP_API
    bool operator==(const PcpSite &rhs) const;
    
    PCP_API
    bool operator<(const PcpSite &rhs) const;

    struct Hash {
        PCP_API
        size_t operator()(const PcpSite &) const;
    };
};

/// \class PcpSiteStr
///
/// A "string-based" version of PcpSite.  This stores layer identifiers as
/// strings rather than SdfLayerHandles, making it stable wrt layer lifetimes.
///
class PcpSiteStr : boost::totally_ordered<PcpSiteStr>
{
public:
    PcpLayerStackIdentifierStr layerStackIdentifierStr;
    SdfPath path;
    
    PCP_API
    PcpSiteStr();

    PCP_API
    PcpSiteStr( const PcpLayerStackIdentifierStr &, const SdfPath & path );
    PCP_API
    PcpSiteStr( const PcpLayerStackIdentifier &, const SdfPath & path );
    PCP_API
    PcpSiteStr( const SdfLayerHandle &, const SdfPath & path );
    PCP_API
    PcpSiteStr(PcpLayerStackSite const &);
    PCP_API
    PcpSiteStr(PcpSite const &);

    PCP_API
    bool operator==(const PcpSiteStr &rhs) const;
    
    PCP_API
    bool operator<(const PcpSiteStr &rhs) const;

    struct Hash {
        PCP_API
        size_t operator()(const PcpSiteStr &) const;
    };
};

/// \class PcpLayerStackSite
///
/// A site specifies a path in a layer stack of scene description.
///
class PcpLayerStackSite : boost::totally_ordered<PcpLayerStackSite> 
{
public:
    PcpLayerStackRefPtr layerStack;
    SdfPath path;

    PCP_API
    PcpLayerStackSite();

    PCP_API
    PcpLayerStackSite( const PcpLayerStackRefPtr &, const SdfPath & path );

    PCP_API
    bool operator==(const PcpLayerStackSite &rhs) const;

    PCP_API
    bool operator<(const PcpLayerStackSite &rhs) const;

    struct Hash {
        PCP_API
        size_t operator()(const PcpLayerStackSite &) const;
    };
};

PCP_API
std::ostream& operator<<(std::ostream&, const PcpSite&);
PCP_API
std::ostream& operator<<(std::ostream&, const PcpSiteStr&);
PCP_API
std::ostream& operator<<(std::ostream&, const PcpLayerStackSite&);

static inline
size_t
hash_value(const PcpSite& site)
{
    return PcpSite::Hash()(site);
}

static inline
size_t
hash_value(const PcpSiteStr& site)
{
    return PcpSiteStr::Hash()(site);
}

static inline
size_t
hash_value(const PcpLayerStackSite& site)
{
    return PcpLayerStackSite::Hash()(site);
}

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_PCP_SITE_H