// Copyright (c) 2009-2021, Google LLC

// All rights reserved.

//

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// modification, are permitted provided that the following conditions are met:

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * 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.

//     * Neither the name of Google LLC 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"

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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef UPB_REFLECTION_DEF_HPP_

#define UPB_REFLECTION_DEF_HPP_

#include <cstring>

#include <memory>

#include <string>

#include <vector>

#include "upb/reflection/def.h"

#include "upb/reflection/def_pool_internal.h"

#include "upb/reflection/enum_def_internal.h"

#include "upb/reflection/message.h"

#include "upb/upb.hpp"

// Must be last

#include "upb/port/def.inc"

namespace upb {

typedef upb_MessageValue MessageValue;

class EnumDefPtr;

class FileDefPtr;

class MessageDefPtr;

class OneofDefPtr;

// A upb::FieldDefPtr describes a single field in a message.  It is most often

// found as a part of a upb_MessageDef, but can also stand alone to represent

// an extension.

class FieldDefPtr {

 public:

  FieldDefPtr() : ptr_(nullptr) {}

  explicit FieldDefPtr(const upb_FieldDef* ptr) : ptr_(ptr) {}

  const upb_FieldDef* ptr() const { return ptr_; }

  typedef upb_FieldType Type;

  typedef upb_CType CType;

  typedef upb_Label Label;

  FileDefPtr file() const;

  const char* full_name() const { return upb_FieldDef_FullName(ptr_); }

  const upb_MiniTableField* mini_table() const {

    return upb_FieldDef_MiniTable(ptr_);

  }

  const UPB_DESC(FieldOptions) * options() const {

    return upb_FieldDef_Options(ptr_);

  }

  Type type() const { return upb_FieldDef_Type(ptr_); }

  CType ctype() const { return upb_FieldDef_CType(ptr_); }

  Label label() const { return upb_FieldDef_Label(ptr_); }

  const char* name() const { return upb_FieldDef_Name(ptr_); }

  const char* json_name() const { return upb_FieldDef_JsonName(ptr_); }

  uint32_t number() const { return upb_FieldDef_Number(ptr_); }

  bool is_extension() const { return upb_FieldDef_IsExtension(ptr_); }

  bool is_required() const { return upb_FieldDef_IsRequired(ptr_); }

  bool has_presence() const { return upb_FieldDef_HasPresence(ptr_); }

  // For non-string, non-submessage fields, this indicates whether binary

  // protobufs are encoded in packed or non-packed format.

  //

  // Note: this accessor reflects the fact that "packed" has different defaults

  // depending on whether the proto is proto2 or proto3.

  bool packed() const { return upb_FieldDef_IsPacked(ptr_); }

  // An integer that can be used as an index into an array of fields for

  // whatever message this field belongs to.  Guaranteed to be less than

  // f->containing_type()->field_count().  May only be accessed once the def has

  // been finalized.

  uint32_t index() const { return upb_FieldDef_Index(ptr_); }

  // The MessageDef to which this field belongs (for extensions, the extended

  // message).

  MessageDefPtr containing_type() const;

  // For extensions, the message the extension is declared inside, or NULL if

  // none.

  MessageDefPtr extension_scope() const;

  // The OneofDef to which this field belongs, or NULL if this field is not part

  // of a oneof.

  OneofDefPtr containing_oneof() const;

  OneofDefPtr real_containing_oneof() const;

  // Convenient field type tests.

  bool IsSubMessage() const { return upb_FieldDef_IsSubMessage(ptr_); }

  bool IsString() const { return upb_FieldDef_IsString(ptr_); }

  bool IsSequence() const { return upb_FieldDef_IsRepeated(ptr_); }

  bool IsPrimitive() const { return upb_FieldDef_IsPrimitive(ptr_); }

  bool IsMap() const { return upb_FieldDef_IsMap(ptr_); }

  MessageValue default_value() const { return upb_FieldDef_Default(ptr_); }

  // Returns the enum or submessage def for this field, if any.  The field's

  // type must match (ie. you may only call enum_subdef() for fields where

  // type() == kUpb_CType_Enum).

  EnumDefPtr enum_subdef() const;

  MessageDefPtr message_type() const;

  explicit operator bool() const { return ptr_ != nullptr; }

  friend bool operator==(FieldDefPtr lhs, FieldDefPtr rhs) {

    return lhs.ptr_ == rhs.ptr_;

  }

  friend bool operator!=(FieldDefPtr lhs, FieldDefPtr rhs) {

    return !(lhs == rhs);

  }

 private:

  const upb_FieldDef* ptr_;

};

// Class that represents a oneof.

class OneofDefPtr {

 public:

  OneofDefPtr() : ptr_(nullptr) {}

  explicit OneofDefPtr(const upb_OneofDef* ptr) : ptr_(ptr) {}

  const upb_OneofDef* ptr() const { return ptr_; }

  explicit operator bool() const { return ptr_ != nullptr; }

  const UPB_DESC(OneofOptions) * options() const {

    return upb_OneofDef_Options(ptr_);

  }

  // Returns the MessageDef that contains this OneofDef.

  MessageDefPtr containing_type() const;

  // Returns the name of this oneof.

  const char* name() const { return upb_OneofDef_Name(ptr_); }

  const char* full_name() const { return upb_OneofDef_FullName(ptr_); }

  // Returns the number of fields in the oneof.

  int field_count() const { return upb_OneofDef_FieldCount(ptr_); }

  FieldDefPtr field(int i) const {

    return FieldDefPtr(upb_OneofDef_Field(ptr_, i));

  }

  // Looks up by name.

  FieldDefPtr FindFieldByName(const char* name, size_t len) const {

    return FieldDefPtr(upb_OneofDef_LookupNameWithSize(ptr_, name, len));

  }

  FieldDefPtr FindFieldByName(const char* name) const {

    return FieldDefPtr(upb_OneofDef_LookupName(ptr_, name));

  }

  template <class T>

  FieldDefPtr FindFieldByName(const T& str) const {

    return FindFieldByName(str.c_str(), str.size());

  }

  // Looks up by tag number.

  FieldDefPtr FindFieldByNumber(uint32_t num) const {

    return FieldDefPtr(upb_OneofDef_LookupNumber(ptr_, num));

  }

 private:

  const upb_OneofDef* ptr_;

};

// Structure that describes a single .proto message type.

class MessageDefPtr {

 public:

  MessageDefPtr() : ptr_(nullptr) {}

  explicit MessageDefPtr(const upb_MessageDef* ptr) : ptr_(ptr) {}

  const UPB_DESC(MessageOptions) * options() const {

    return upb_MessageDef_Options(ptr_);

  }

  std::string MiniDescriptorEncode() const {

    upb::Arena arena;

    upb_StringView md;

    upb_MessageDef_MiniDescriptorEncode(ptr_, arena.ptr(), &md);

    return std::string(md.data, md.size);

  }

  const upb_MessageDef* ptr() const { return ptr_; }

  FileDefPtr file() const;

  const char* full_name() const { return upb_MessageDef_FullName(ptr_); }

  const char* name() const { return upb_MessageDef_Name(ptr_); }

  const upb_MiniTable* mini_table() const {

    return upb_MessageDef_MiniTable(ptr_);

  }

  // The number of fields that belong to the MessageDef.

  int field_count() const { return upb_MessageDef_FieldCount(ptr_); }

  FieldDefPtr field(int i) const {

    return FieldDefPtr(upb_MessageDef_Field(ptr_, i));

  }

  // The number of oneofs that belong to the MessageDef.

  int oneof_count() const { return upb_MessageDef_OneofCount(ptr_); }

  int real_oneof_count() const { return upb_MessageDef_RealOneofCount(ptr_); }

  OneofDefPtr oneof(int i) const {

    return OneofDefPtr(upb_MessageDef_Oneof(ptr_, i));

  }

  int enum_type_count() const { return upb_MessageDef_NestedEnumCount(ptr_); }

  EnumDefPtr enum_type(int i) const;

  int nested_message_count() const {

    return upb_MessageDef_NestedMessageCount(ptr_);

  }

  MessageDefPtr nested_message(int i) const {

    return MessageDefPtr(upb_MessageDef_NestedMessage(ptr_, i));

  }

  int nested_extension_count() const {

    return upb_MessageDef_NestedExtensionCount(ptr_);

  }

  FieldDefPtr nested_extension(int i) const {

    return FieldDefPtr(upb_MessageDef_NestedExtension(ptr_, i));

  }

  int extension_range_count() const {

    return upb_MessageDef_ExtensionRangeCount(ptr_);

  }

  upb_Syntax syntax() const { return upb_MessageDef_Syntax(ptr_); }

  // These return null pointers if the field is not found.

  FieldDefPtr FindFieldByNumber(uint32_t number) const {

    return FieldDefPtr(upb_MessageDef_FindFieldByNumber(ptr_, number));

  }

  FieldDefPtr FindFieldByName(const char* name, size_t len) const {

    return FieldDefPtr(upb_MessageDef_FindFieldByNameWithSize(ptr_, name, len));

  }

  FieldDefPtr FindFieldByName(const char* name) const {

    return FieldDefPtr(upb_MessageDef_FindFieldByName(ptr_, name));

  }

  template <class T>

  FieldDefPtr FindFieldByName(const T& str) const {

    return FindFieldByName(str.c_str(), str.size());

  }

  OneofDefPtr FindOneofByName(const char* name, size_t len) const {

    return OneofDefPtr(upb_MessageDef_FindOneofByNameWithSize(ptr_, name, len));

  }

  OneofDefPtr FindOneofByName(const char* name) const {

    return OneofDefPtr(upb_MessageDef_FindOneofByName(ptr_, name));

  }

  template <class T>

  OneofDefPtr FindOneofByName(const T& str) const {

    return FindOneofByName(str.c_str(), str.size());

  }

  // Is this message a map entry?

  bool mapentry() const { return upb_MessageDef_IsMapEntry(ptr_); }

  FieldDefPtr map_key() const {

    if (!mapentry()) return FieldDefPtr();

    return FieldDefPtr(upb_MessageDef_Field(ptr_, 0));

  }

  FieldDefPtr map_value() const {

    if (!mapentry()) return FieldDefPtr();

    return FieldDefPtr(upb_MessageDef_Field(ptr_, 1));

  }

  // Return the type of well known type message. kUpb_WellKnown_Unspecified for

  // non-well-known message.

  upb_WellKnown wellknowntype() const {

    return upb_MessageDef_WellKnownType(ptr_);

  }

  explicit operator bool() const { return ptr_ != nullptr; }

  friend bool operator==(MessageDefPtr lhs, MessageDefPtr rhs) {

    return lhs.ptr_ == rhs.ptr_;

  }

  friend bool operator!=(MessageDefPtr lhs, MessageDefPtr rhs) {

    return !(lhs == rhs);

  }

 private:

  class FieldIter {

   public:

    explicit FieldIter(const upb_MessageDef* m, int i) : m_(m), i_(i) {}

    void operator++() { i_++; }

    FieldDefPtr operator*() {

      return FieldDefPtr(upb_MessageDef_Field(m_, i_));

    }

    friend bool operator==(FieldIter lhs, FieldIter rhs) {

      return lhs.i_ == rhs.i_;

    }

    friend bool operator!=(FieldIter lhs, FieldIter rhs) {

      return !(lhs == rhs);

    }

   private:

    const upb_MessageDef* m_;

    int i_;

  };

  class FieldAccessor {

   public:

    explicit FieldAccessor(const upb_MessageDef* md) : md_(md) {}

    FieldIter begin() { return FieldIter(md_, 0); }

    FieldIter end() { return FieldIter(md_, upb_MessageDef_FieldCount(md_)); }

   private:

    const upb_MessageDef* md_;

  };

  class OneofIter {

   public:

    explicit OneofIter(const upb_MessageDef* m, int i) : m_(m), i_(i) {}

    void operator++() { i_++; }

    OneofDefPtr operator*() {

      return OneofDefPtr(upb_MessageDef_Oneof(m_, i_));

    }

    friend bool operator==(OneofIter lhs, OneofIter rhs) {

      return lhs.i_ == rhs.i_;

    }

    friend bool operator!=(OneofIter lhs, OneofIter rhs) {

      return !(lhs == rhs);

    }

   private:

    const upb_MessageDef* m_;

    int i_;

  };

  class OneofAccessor {

   public:

    explicit OneofAccessor(const upb_MessageDef* md) : md_(md) {}

    OneofIter begin() { return OneofIter(md_, 0); }

    OneofIter end() { return OneofIter(md_, upb_MessageDef_OneofCount(md_)); }

   private:

    const upb_MessageDef* md_;

  };

 public:

  FieldAccessor fields() const { return FieldAccessor(ptr()); }

  OneofAccessor oneofs() const { return OneofAccessor(ptr()); }

 private:

  const upb_MessageDef* ptr_;

};

class EnumValDefPtr {

 public:

  EnumValDefPtr() : ptr_(nullptr) {}

  explicit EnumValDefPtr(const upb_EnumValueDef* ptr) : ptr_(ptr) {}

  const UPB_DESC(EnumValueOptions) * options() const {

    return upb_EnumValueDef_Options(ptr_);

  }

  int32_t number() const { return upb_EnumValueDef_Number(ptr_); }

  const char* full_name() const { return upb_EnumValueDef_FullName(ptr_); }

  const char* name() const { return upb_EnumValueDef_Name(ptr_); }

 private:

  const upb_EnumValueDef* ptr_;

};

class EnumDefPtr {

 public:

  EnumDefPtr() : ptr_(nullptr) {}

  explicit EnumDefPtr(const upb_EnumDef* ptr) : ptr_(ptr) {}

  const UPB_DESC(EnumOptions) * options() const {

    return upb_EnumDef_Options(ptr_);

  }

  const upb_MiniTableEnum* mini_table() const {

    return _upb_EnumDef_MiniTable(ptr_);

  }

  std::string MiniDescriptorEncode() const {

    upb::Arena arena;

    upb_StringView md;

    upb_EnumDef_MiniDescriptorEncode(ptr_, arena.ptr(), &md);

    return std::string(md.data, md.size);

  }

  const upb_EnumDef* ptr() const { return ptr_; }

  explicit operator bool() const { return ptr_ != nullptr; }

  const char* full_name() const { return upb_EnumDef_FullName(ptr_); }

  const char* name() const { return upb_EnumDef_Name(ptr_); }

  bool is_closed() const { return upb_EnumDef_IsClosed(ptr_); }

  // The value that is used as the default when no field default is specified.

  // If not set explicitly, the first value that was added will be used.

  // The default value must be a member of the enum.

  // Requires that value_count() > 0.

  int32_t default_value() const { return upb_EnumDef_Default(ptr_); }

  // Returns the number of values currently defined in the enum.  Note that

  // multiple names can refer to the same number, so this may be greater than

  // the total number of unique numbers.

  int value_count() const { return upb_EnumDef_ValueCount(ptr_); }

  EnumValDefPtr value(int i) const {

    return EnumValDefPtr(upb_EnumDef_Value(ptr_, i));

  }

  // Lookups from name to integer, returning true if found.

  EnumValDefPtr FindValueByName(const char* name) const {

    return EnumValDefPtr(upb_EnumDef_FindValueByName(ptr_, name));

  }

  // Finds the name corresponding to the given number, or NULL if none was

  // found.  If more than one name corresponds to this number, returns the

  // first one that was added.

  EnumValDefPtr FindValueByNumber(int32_t num) const {

    return EnumValDefPtr(upb_EnumDef_FindValueByNumber(ptr_, num));

  }

 private:

  const upb_EnumDef* ptr_;

};

// Class that represents a .proto file with some things defined in it.

//

// Many users won't care about FileDefs, but they are necessary if you want to

// read the values of file-level options.

class FileDefPtr {

 public:

  explicit FileDefPtr(const upb_FileDef* ptr) : ptr_(ptr) {}

  const UPB_DESC(FileOptions) * options() const {

    return upb_FileDef_Options(ptr_);

  }

  const upb_FileDef* ptr() const { return ptr_; }

  // Get/set name of the file (eg. "foo/bar.proto").

  const char* name() const { return upb_FileDef_Name(ptr_); }

  // Package name for definitions inside the file (eg. "foo.bar").

  const char* package() const { return upb_FileDef_Package(ptr_); }

  // Syntax for the file.  Defaults to proto2.

  upb_Syntax syntax() const { return upb_FileDef_Syntax(ptr_); }

  // Get the list of dependencies from the file.  These are returned in the

  // order that they were added to the FileDefPtr.

  int dependency_count() const { return upb_FileDef_DependencyCount(ptr_); }

  FileDefPtr dependency(int index) const {

    return FileDefPtr(upb_FileDef_Dependency(ptr_, index));

  }

  int public_dependency_count() const {

    return upb_FileDef_PublicDependencyCount(ptr_);

  }

  FileDefPtr public_dependency(int index) const {

    return FileDefPtr(upb_FileDef_PublicDependency(ptr_, index));

  }

  int toplevel_enum_count() const {

    return upb_FileDef_TopLevelEnumCount(ptr_);

  }

  EnumDefPtr toplevel_enum(int index) const {

    return EnumDefPtr(upb_FileDef_TopLevelEnum(ptr_, index));

  }

  int toplevel_message_count() const {

    return upb_FileDef_TopLevelMessageCount(ptr_);

  }

  MessageDefPtr toplevel_message(int index) const {

    return MessageDefPtr(upb_FileDef_TopLevelMessage(ptr_, index));

  }

  int toplevel_extension_count() const {

    return upb_FileDef_TopLevelExtensionCount(ptr_);

  }

  FieldDefPtr toplevel_extension(int index) const {

    return FieldDefPtr(upb_FileDef_TopLevelExtension(ptr_, index));

  }

  explicit operator bool() const { return ptr_ != nullptr; }

  friend bool operator==(FileDefPtr lhs, FileDefPtr rhs) {

    return lhs.ptr_ == rhs.ptr_;

  }

  friend bool operator!=(FileDefPtr lhs, FileDefPtr rhs) {

    return !(lhs == rhs);

  }

 private:

  const upb_FileDef* ptr_;

};

// Non-const methods in upb::DefPool are NOT thread-safe.

class DefPool {

 public:

  DefPool() : ptr_(upb_DefPool_New(), upb_DefPool_Free) {}

  explicit DefPool(upb_DefPool* s) : ptr_(s, upb_DefPool_Free) {}

  const upb_DefPool* ptr() const { return ptr_.get(); }

  upb_DefPool* ptr() { return ptr_.get(); }

  // Finds an entry in the symbol table with this exact name.  If not found,

  // returns NULL.

  MessageDefPtr FindMessageByName(const char* sym) const {

    return MessageDefPtr(upb_DefPool_FindMessageByName(ptr_.get(), sym));

  }

  EnumDefPtr FindEnumByName(const char* sym) const {

    return EnumDefPtr(upb_DefPool_FindEnumByName(ptr_.get(), sym));

  }

  FileDefPtr FindFileByName(const char* name) const {

    return FileDefPtr(upb_DefPool_FindFileByName(ptr_.get(), name));

  }

  FieldDefPtr FindExtensionByName(const char* name) const {

    return FieldDefPtr(upb_DefPool_FindExtensionByName(ptr_.get(), name));

  }

  void _SetPlatform(upb_MiniTablePlatform platform) {

    _upb_DefPool_SetPlatform(ptr_.get(), platform);

  }

  // TODO: iteration?

  // Adds the given serialized FileDescriptorProto to the pool.

  FileDefPtr AddFile(const UPB_DESC(FileDescriptorProto) * file_proto,

                     Status* status) {

    return FileDefPtr(

        upb_DefPool_AddFile(ptr_.get(), file_proto, status->ptr()));

  }

 private:

  std::unique_ptr<upb_DefPool, decltype(&upb_DefPool_Free)> ptr_;

};

// TODO(b/236632406): This typedef is deprecated. Delete it.

using SymbolTable = DefPool;

inline FileDefPtr FieldDefPtr::file() const {

  return FileDefPtr(upb_FieldDef_File(ptr_));

}

inline FileDefPtr MessageDefPtr::file() const {

  return FileDefPtr(upb_MessageDef_File(ptr_));

}

inline EnumDefPtr MessageDefPtr::enum_type(int i) const {

  return EnumDefPtr(upb_MessageDef_NestedEnum(ptr_, i));

}

inline MessageDefPtr FieldDefPtr::message_type() const {

  return MessageDefPtr(upb_FieldDef_MessageSubDef(ptr_));

}

inline MessageDefPtr FieldDefPtr::containing_type() const {

  return MessageDefPtr(upb_FieldDef_ContainingType(ptr_));

}

inline MessageDefPtr FieldDefPtr::extension_scope() const {

  return MessageDefPtr(upb_FieldDef_ExtensionScope(ptr_));

}

inline MessageDefPtr OneofDefPtr::containing_type() const {

  return MessageDefPtr(upb_OneofDef_ContainingType(ptr_));

}

inline OneofDefPtr FieldDefPtr::containing_oneof() const {

  return OneofDefPtr(upb_FieldDef_ContainingOneof(ptr_));

}

inline OneofDefPtr FieldDefPtr::real_containing_oneof() const {

  return OneofDefPtr(upb_FieldDef_RealContainingOneof(ptr_));

}

inline EnumDefPtr FieldDefPtr::enum_subdef() const {

  return EnumDefPtr(upb_FieldDef_EnumSubDef(ptr_));

}

}  // namespace upb

#include "upb/port/undef.inc"

#endif  // UPB_REFLECTION_DEF_HPP_