// Copyright (c) 2005-2023 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License
// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
// or implied. See the License for the specific language governing permissions and limitations under
// the License.
//
// Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic
// License. At your option, you may continue to consider qpdf to be licensed under those terms.
// Please see the manual for additional information.

#ifndef QPDFFILESPECOBJECTHELPER_HH
#define QPDFFILESPECOBJECTHELPER_HH

#include <qpdf/QPDFObjectHelper.hh>

#include <qpdf/DLL.h>

#include <qpdf/QPDFEFStreamObjectHelper.hh>
#include <qpdf/QPDFObjectHandle.hh>

// This class provides a higher level interface around File Specification dictionaries, which are
// discussed in section 7.11 of the ISO-32000 PDF specification.

class QPDFFileSpecObjectHelper: public QPDFObjectHelper
{
  public:
    QPDF_DLL
    QPDFFileSpecObjectHelper(QPDFObjectHandle);
    QPDF_DLL
    ~QPDFFileSpecObjectHelper() override = default;

    QPDF_DLL
    std::string getDescription();

    // Get the main filename for this file specification. In priority order, check /UF, /F, /Unix,
    // /DOS, /Mac.
    QPDF_DLL
    std::string getFilename();

    // Return any of /UF, /F, /Unix, /DOS, /Mac filename keys that may be present in the object.
    QPDF_DLL
    std::map<std::string, std::string> getFilenames();

    // Get the requested embedded file stream for this file specification. If key is empty, In
    // priority order, check /UF, /F, /Unix, /DOS, /Mac. Returns a null object if not found. If this
    // is an actual embedded file stream, its data is the content of the attachment. You can also
    // use QPDFEFStreamObjectHelper for higher level access to the parameters.
    QPDF_DLL
    QPDFObjectHandle getEmbeddedFileStream(std::string const& key = "");

    // Return the /EF key of the file spec, which is a map from file name key to embedded file
    // stream.
    QPDF_DLL
    QPDFObjectHandle getEmbeddedFileStreams();

    // Setters return a reference to this object so that they can be used as fluent interfaces, e.g.
    // fsoh.setDescription(x).setFilename(y);

    // Create a new filespec as an indirect object with the given filename, and attach the contents
    // of the specified file as data in an embedded file stream.
    QPDF_DLL
    static QPDFFileSpecObjectHelper
    createFileSpec(QPDF& qpdf, std::string const& filename, std::string const& fullpath);

    // Create a new filespec as an indirect object with the given unicode filename and embedded file
    // stream. The file name will be used as both /UF and /F. If you need to override, call
    // setFilename.
    QPDF_DLL
    static QPDFFileSpecObjectHelper
    createFileSpec(QPDF& qpdf, std::string const& filename, QPDFEFStreamObjectHelper);

    QPDF_DLL
    QPDFFileSpecObjectHelper& setDescription(std::string const&);
    // setFilename sets /UF to unicode_name. If compat_name is empty, it is also set to
    // unicode_name. unicode_name should be a UTF-8 encoded string. compat_name is converted to a
    // string QPDFObjectHandle literally, preserving whatever encoding it might happen to have.
    QPDF_DLL
    QPDFFileSpecObjectHelper&
    setFilename(std::string const& unicode_name, std::string const& compat_name = "");

  private:
    class Members
    {
        friend class QPDFFileSpecObjectHelper;

      public:
        QPDF_DLL
        ~Members() = default;

      private:
        Members() = default;
        Members(Members const&) = delete;
    };

    std::shared_ptr<Members> m;
};

#endif // QPDFFILESPECOBJECTHELPER_HH
