// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// 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 Inc. 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
// OWNER 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.

#include <limits>
#include <sstream>

#include <google/protobuf/compiler/code_generator.h>
#include <google/protobuf/compiler/plugin.h>
#include <google/protobuf/descriptor.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/stubs/mathlimits.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/wire_format.h>

#include <google/protobuf/compiler/csharp/csharp_field_base.h>
#include <google/protobuf/compiler/csharp/csharp_helpers.h>
#include <google/protobuf/compiler/csharp/csharp_names.h>

namespace google {
namespace protobuf {
namespace compiler {
namespace csharp {

void FieldGeneratorBase::SetCommonFieldVariables(
    std::map<string, string>* variables) {
  // Note: this will be valid even though the tag emitted for packed and unpacked versions of
  // repeated fields varies by wire format. The wire format is encoded in the bottom 3 bits, which
  // never effects the tag size.
  int tag_size = internal::WireFormat::TagSize(descriptor_->number(), descriptor_->type());
  uint tag = internal::WireFormat::MakeTag(descriptor_);
  uint8 tag_array[5];
  io::CodedOutputStream::WriteTagToArray(tag, tag_array);
  string tag_bytes = SimpleItoa(tag_array[0]);
  for (int i = 1; i < tag_size; i++) {
    tag_bytes += ", " + SimpleItoa(tag_array[i]);
  }

  (*variables)["access_level"] = "public";
  (*variables)["tag"] = SimpleItoa(tag);
  (*variables)["tag_size"] = SimpleItoa(tag_size);
  (*variables)["tag_bytes"] = tag_bytes;

  (*variables)["property_name"] = property_name();
  (*variables)["type_name"] = type_name();
  (*variables)["name"] = name();
  (*variables)["descriptor_name"] = descriptor_->name();
  (*variables)["default_value"] = default_value();
  if (has_default_value()) {
    (*variables)["name_def_message"] =
      (*variables)["name"] + "_ = " + (*variables)["default_value"];
  } else {
    (*variables)["name_def_message"] = (*variables)["name"] + "_";
  }
  (*variables)["capitalized_type_name"] = capitalized_type_name();
  (*variables)["number"] = number();
  (*variables)["has_property_check"] =
    (*variables)["property_name"] + " != " + (*variables)["default_value"];
  (*variables)["other_has_property_check"] = "other." +
    (*variables)["property_name"] + " != " + (*variables)["default_value"];
}

void FieldGeneratorBase::SetCommonOneofFieldVariables(
    std::map<string, string>* variables) {
  (*variables)["oneof_name"] = oneof_name();
  (*variables)["has_property_check"] =
    oneof_name() + "Case_ == " + oneof_property_name() +
    "OneofCase." + property_name();
  (*variables)["oneof_property_name"] = oneof_property_name();
}

FieldGeneratorBase::FieldGeneratorBase(const FieldDescriptor* descriptor,
                                       int fieldOrdinal, const Options* options)
    : SourceGeneratorBase(descriptor->file(), options),
      descriptor_(descriptor),
      fieldOrdinal_(fieldOrdinal) {
  SetCommonFieldVariables(&variables_);
}

FieldGeneratorBase::~FieldGeneratorBase() {
}

void FieldGeneratorBase::GenerateFreezingCode(io::Printer* printer) {
  // No-op: only message fields and repeated fields need
  // special handling for freezing, so default to not generating any code.
}

void FieldGeneratorBase::GenerateCodecCode(io::Printer* printer) {
    // No-op: expect this to be overridden by appropriate types.
    // Could fail if we get called here though...
}

void FieldGeneratorBase::AddDeprecatedFlag(io::Printer* printer) {
  if (descriptor_->options().deprecated()) {
    printer->Print("[global::System.ObsoleteAttribute]\n");
  } else if (descriptor_->type() == FieldDescriptor::TYPE_MESSAGE &&
           descriptor_->message_type()->options().deprecated()) {
    printer->Print("[global::System.ObsoleteAttribute]\n");
  }
}

void FieldGeneratorBase::AddPublicMemberAttributes(io::Printer* printer) {
  AddDeprecatedFlag(printer);
  WriteGeneratedCodeAttributes(printer);
}

std::string FieldGeneratorBase::oneof_property_name() {
  return UnderscoresToCamelCase(descriptor_->containing_oneof()->name(), true);
}

std::string FieldGeneratorBase::oneof_name() {
  return UnderscoresToCamelCase(descriptor_->containing_oneof()->name(), false);
}

std::string FieldGeneratorBase::property_name() {
  return GetPropertyName(descriptor_);
}

std::string FieldGeneratorBase::name() {
  return UnderscoresToCamelCase(GetFieldName(descriptor_), false);
}

std::string FieldGeneratorBase::type_name() {
  return type_name(descriptor_);
}

std::string FieldGeneratorBase::type_name(const FieldDescriptor* descriptor) {
  switch (descriptor->type()) {
    case FieldDescriptor::TYPE_ENUM:
      return GetClassName(descriptor->enum_type());
    case FieldDescriptor::TYPE_MESSAGE:
    case FieldDescriptor::TYPE_GROUP:
      if (IsWrapperType(descriptor)) {
        const FieldDescriptor* wrapped_field =
            descriptor->message_type()->field(0);
        string wrapped_field_type_name = type_name(wrapped_field);
        // String and ByteString go to the same type; other wrapped types
        // go to the nullable equivalent.
        if (wrapped_field->type() == FieldDescriptor::TYPE_STRING ||
            wrapped_field->type() == FieldDescriptor::TYPE_BYTES) {
          return wrapped_field_type_name;
        } else {
          return wrapped_field_type_name + "?";
        }
      }
      return GetClassName(descriptor->message_type());
    case FieldDescriptor::TYPE_DOUBLE:
      return "double";
    case FieldDescriptor::TYPE_FLOAT:
      return "float";
    case FieldDescriptor::TYPE_INT64:
      return "long";
    case FieldDescriptor::TYPE_UINT64:
      return "ulong";
    case FieldDescriptor::TYPE_INT32:
      return "int";
    case FieldDescriptor::TYPE_FIXED64:
      return "ulong";
    case FieldDescriptor::TYPE_FIXED32:
      return "uint";
    case FieldDescriptor::TYPE_BOOL:
      return "bool";
    case FieldDescriptor::TYPE_STRING:
      return "string";
    case FieldDescriptor::TYPE_BYTES:
      return "pb::ByteString";
    case FieldDescriptor::TYPE_UINT32:
      return "uint";
    case FieldDescriptor::TYPE_SFIXED32:
      return "int";
    case FieldDescriptor::TYPE_SFIXED64:
      return "long";
    case FieldDescriptor::TYPE_SINT32:
      return "int";
    case FieldDescriptor::TYPE_SINT64:
      return "long";
    default:
      GOOGLE_LOG(FATAL)<< "Unknown field type.";
      return "";
  }
}

bool FieldGeneratorBase::has_default_value() {
  switch (descriptor_->type()) {
    case FieldDescriptor::TYPE_ENUM:
    case FieldDescriptor::TYPE_MESSAGE:
    case FieldDescriptor::TYPE_GROUP:
      return true;
    case FieldDescriptor::TYPE_DOUBLE:
      return descriptor_->default_value_double() != 0.0;
    case FieldDescriptor::TYPE_FLOAT:
      return descriptor_->default_value_float() != 0.0;
    case FieldDescriptor::TYPE_INT64:
      return descriptor_->default_value_int64() != 0L;
    case FieldDescriptor::TYPE_UINT64:
      return descriptor_->default_value_uint64() != 0L;
    case FieldDescriptor::TYPE_INT32:
      return descriptor_->default_value_int32() != 0;
    case FieldDescriptor::TYPE_FIXED64:
      return descriptor_->default_value_uint64() != 0L;
    case FieldDescriptor::TYPE_FIXED32:
      return descriptor_->default_value_uint32() != 0;
    case FieldDescriptor::TYPE_BOOL:
      return descriptor_->default_value_bool();
    case FieldDescriptor::TYPE_STRING:
      return true;
    case FieldDescriptor::TYPE_BYTES:
      return true;
    case FieldDescriptor::TYPE_UINT32:
      return descriptor_->default_value_uint32() != 0;
    case FieldDescriptor::TYPE_SFIXED32:
      return descriptor_->default_value_int32() != 0;
    case FieldDescriptor::TYPE_SFIXED64:
      return descriptor_->default_value_int64() != 0L;
    case FieldDescriptor::TYPE_SINT32:
      return descriptor_->default_value_int32() != 0;
    case FieldDescriptor::TYPE_SINT64:
      return descriptor_->default_value_int64() != 0L;
    default:
      GOOGLE_LOG(FATAL)<< "Unknown field type.";
      return true;
  }
}

bool FieldGeneratorBase::is_nullable_type() {
  switch (descriptor_->type()) {
    case FieldDescriptor::TYPE_ENUM:
    case FieldDescriptor::TYPE_DOUBLE:
    case FieldDescriptor::TYPE_FLOAT:
    case FieldDescriptor::TYPE_INT64:
    case FieldDescriptor::TYPE_UINT64:
    case FieldDescriptor::TYPE_INT32:
    case FieldDescriptor::TYPE_FIXED64:
    case FieldDescriptor::TYPE_FIXED32:
    case FieldDescriptor::TYPE_BOOL:
    case FieldDescriptor::TYPE_UINT32:
    case FieldDescriptor::TYPE_SFIXED32:
    case FieldDescriptor::TYPE_SFIXED64:
    case FieldDescriptor::TYPE_SINT32:
    case FieldDescriptor::TYPE_SINT64:
      return false;

    case FieldDescriptor::TYPE_MESSAGE:
    case FieldDescriptor::TYPE_GROUP:
    case FieldDescriptor::TYPE_STRING:
    case FieldDescriptor::TYPE_BYTES:
      return true;

    default:
      GOOGLE_LOG(FATAL)<< "Unknown field type.";
      return true;
  }
}

bool AllPrintableAscii(const std::string& text) {
  for(int i = 0; i < text.size(); i++) {
    if (text[i] < 0x20 || text[i] > 0x7e) {
      return false;
    }
  }
  return true;
}

std::string FieldGeneratorBase::GetStringDefaultValueInternal() {
  // No other default values needed for proto3...
  return "\"\"";
}

std::string FieldGeneratorBase::GetBytesDefaultValueInternal() {
  // No other default values needed for proto3...
  return "pb::ByteString.Empty";
}

std::string FieldGeneratorBase::default_value() {
    return default_value(descriptor_);
}

std::string FieldGeneratorBase::default_value(const FieldDescriptor* descriptor) {
  switch (descriptor->type()) {
    case FieldDescriptor::TYPE_ENUM:
      // All proto3 enums have a default value of 0, and there's an implicit conversion from the constant 0 to
      // any C# enum. This means we don't need to work out what we actually mapped the enum value name to.
     return "0";
    case FieldDescriptor::TYPE_MESSAGE:
    case FieldDescriptor::TYPE_GROUP:
      if (IsWrapperType(descriptor)) {
        const FieldDescriptor* wrapped_field = descriptor->message_type()->field(0);
        return default_value(wrapped_field);
      } else {
        return "null";
      }
    case FieldDescriptor::TYPE_DOUBLE: {
      double value = descriptor->default_value_double();
      if (value == std::numeric_limits<double>::infinity()) {
        return "double.PositiveInfinity";
      } else if (value == -std::numeric_limits<double>::infinity()) {
        return "double.NegativeInfinity";
      } else if (MathLimits<double>::IsNaN(value)) {
        return "double.NaN";
      }
      return SimpleDtoa(value) + "D";
    }
    case FieldDescriptor::TYPE_FLOAT: {
      float value = descriptor->default_value_float();
      if (value == std::numeric_limits<float>::infinity()) {
        return "float.PositiveInfinity";
      } else if (value == -std::numeric_limits<float>::infinity()) {
        return "float.NegativeInfinity";
      } else if (MathLimits<float>::IsNaN(value)) {
        return "float.NaN";
      }
      return SimpleFtoa(value) + "F";
    }
    case FieldDescriptor::TYPE_INT64:
      return SimpleItoa(descriptor->default_value_int64()) + "L";
    case FieldDescriptor::TYPE_UINT64:
      return SimpleItoa(descriptor->default_value_uint64()) + "UL";
    case FieldDescriptor::TYPE_INT32:
      return SimpleItoa(descriptor->default_value_int32());
    case FieldDescriptor::TYPE_FIXED64:
      return SimpleItoa(descriptor->default_value_uint64()) + "UL";
    case FieldDescriptor::TYPE_FIXED32:
      return SimpleItoa(descriptor->default_value_uint32());
    case FieldDescriptor::TYPE_BOOL:
      if (descriptor->default_value_bool()) {
        return "true";
      } else {
        return "false";
      }
    case FieldDescriptor::TYPE_STRING:
      return GetStringDefaultValueInternal();
    case FieldDescriptor::TYPE_BYTES:
      return GetBytesDefaultValueInternal();
    case FieldDescriptor::TYPE_UINT32:
      return SimpleItoa(descriptor->default_value_uint32());
    case FieldDescriptor::TYPE_SFIXED32:
      return SimpleItoa(descriptor->default_value_int32());
    case FieldDescriptor::TYPE_SFIXED64:
      return SimpleItoa(descriptor->default_value_int64()) + "L";
    case FieldDescriptor::TYPE_SINT32:
      return SimpleItoa(descriptor->default_value_int32());
    case FieldDescriptor::TYPE_SINT64:
      return SimpleItoa(descriptor->default_value_int64()) + "L";
    default:
      GOOGLE_LOG(FATAL)<< "Unknown field type.";
      return "";
  }
}

std::string FieldGeneratorBase::number() {
  return SimpleItoa(descriptor_->number());
}

std::string FieldGeneratorBase::capitalized_type_name() {
  switch (descriptor_->type()) {
    case FieldDescriptor::TYPE_ENUM:
      return "Enum";
    case FieldDescriptor::TYPE_MESSAGE:
      return "Message";
    case FieldDescriptor::TYPE_GROUP:
      return "Group";
    case FieldDescriptor::TYPE_DOUBLE:
      return "Double";
    case FieldDescriptor::TYPE_FLOAT:
      return "Float";
    case FieldDescriptor::TYPE_INT64:
      return "Int64";
    case FieldDescriptor::TYPE_UINT64:
      return "UInt64";
    case FieldDescriptor::TYPE_INT32:
      return "Int32";
    case FieldDescriptor::TYPE_FIXED64:
      return "Fixed64";
    case FieldDescriptor::TYPE_FIXED32:
      return "Fixed32";
    case FieldDescriptor::TYPE_BOOL:
      return "Bool";
    case FieldDescriptor::TYPE_STRING:
      return "String";
    case FieldDescriptor::TYPE_BYTES:
      return "Bytes";
    case FieldDescriptor::TYPE_UINT32:
      return "UInt32";
    case FieldDescriptor::TYPE_SFIXED32:
      return "SFixed32";
    case FieldDescriptor::TYPE_SFIXED64:
      return "SFixed64";
    case FieldDescriptor::TYPE_SINT32:
      return "SInt32";
    case FieldDescriptor::TYPE_SINT64:
      return "SInt64";
    default:
      GOOGLE_LOG(FATAL)<< "Unknown field type.";
      return "";
  }
}

}  // namespace csharp
}  // namespace compiler
}  // namespace protobuf
}  // namespace google