#region Copyright notice and license

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://github.com/jskeet/dotnet-protobufs/
// Original C++/Java/Python code:
// http://code.google.com/p/protobuf/
//
// 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.

#endregion

using Google.ProtocolBuffers.Descriptors;

namespace Google.ProtocolBuffers.ProtoGen
{
    internal class EnumFieldGenerator : FieldGeneratorBase, IFieldSourceGenerator
    {
        internal EnumFieldGenerator(FieldDescriptor descriptor, int fieldOrdinal)
            : base(descriptor, fieldOrdinal)
        {
        }

        public void GenerateMembers(TextGenerator writer)
        {
            writer.WriteLine("private bool has{0};", PropertyName);
            writer.WriteLine("private {0} {1}_ = {2};", TypeName, Name, DefaultValue);
            AddDeprecatedFlag(writer);
            writer.WriteLine("public bool Has{0} {{", PropertyName);
            writer.WriteLine("  get {{ return has{0}; }}", PropertyName);
            writer.WriteLine("}");
            AddPublicMemberAttributes(writer);
            writer.WriteLine("public {0} {1} {{", TypeName, PropertyName);
            writer.WriteLine("  get {{ return {0}_; }}", Name);
            writer.WriteLine("}");
        }

        public void GenerateBuilderMembers(TextGenerator writer)
        {
            AddDeprecatedFlag(writer);
            writer.WriteLine("public bool Has{0} {{", PropertyName);
            writer.WriteLine(" get {{ return result.has{0}; }}", PropertyName);
            writer.WriteLine("}");
            AddPublicMemberAttributes(writer);
            writer.WriteLine("public {0} {1} {{", TypeName, PropertyName);
            writer.WriteLine("  get {{ return result.{0}; }}", PropertyName);
            writer.WriteLine("  set {{ Set{0}(value); }}", PropertyName);
            writer.WriteLine("}");
            AddPublicMemberAttributes(writer);
            writer.WriteLine("public Builder Set{0}({1} value) {{", PropertyName, TypeName);
            writer.WriteLine("  PrepareBuilder();");
            writer.WriteLine("  result.has{0} = true;", PropertyName);
            writer.WriteLine("  result.{0}_ = value;", Name);
            writer.WriteLine("  return this;");
            writer.WriteLine("}");
            AddDeprecatedFlag(writer);
            writer.WriteLine("public Builder Clear{0}() {{", PropertyName);
            writer.WriteLine("  PrepareBuilder();");
            writer.WriteLine("  result.has{0} = false;", PropertyName);
            writer.WriteLine("  result.{0}_ = {1};", Name, DefaultValue);
            writer.WriteLine("  return this;");
            writer.WriteLine("}");
        }

        public void GenerateMergingCode(TextGenerator writer)
        {
            writer.WriteLine("if (other.Has{0}) {{", PropertyName);
            writer.WriteLine("  {0} = other.{0};", PropertyName);
            writer.WriteLine("}");
        }

        public void GenerateBuildingCode(TextGenerator writer)
        {
            // Nothing to do here for enum types
        }

        public void GenerateParsingCode(TextGenerator writer)
        {
            writer.WriteLine("object unknown;");
            writer.WriteLine("if(input.ReadEnum(ref result.{0}_, out unknown)) {{", Name);
            writer.WriteLine("  result.has{0} = true;", PropertyName);
            writer.WriteLine("} else if(unknown is int) {");
            if (!UseLiteRuntime)
            {
                writer.WriteLine("  if (unknownFields == null) {"); // First unknown field - create builder now
                writer.WriteLine("    unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);");
                writer.WriteLine("  }");
                writer.WriteLine("  unknownFields.MergeVarintField({0}, (ulong)(int)unknown);", Number);
            }
            writer.WriteLine("}");
        }

        public void GenerateSerializationCode(TextGenerator writer)
        {
            writer.WriteLine("if (has{0}) {{", PropertyName);
            writer.WriteLine("  output.WriteEnum({0}, field_names[{2}], (int) {1}, {1});", Number, PropertyName,
                             FieldOrdinal);
            writer.WriteLine("}");
        }

        public void GenerateSerializedSizeCode(TextGenerator writer)
        {
            writer.WriteLine("if (has{0}) {{", PropertyName);
            writer.WriteLine("  size += pb::CodedOutputStream.ComputeEnumSize({0}, (int) {1});", Number, PropertyName);
            writer.WriteLine("}");
        }

        public override void WriteHash(TextGenerator writer)
        {
            writer.WriteLine("if (has{0}) hash ^= {1}_.GetHashCode();", PropertyName, Name);
        }

        public override void WriteEquals(TextGenerator writer)
        {
            writer.WriteLine("if (has{0} != other.has{0} || (has{0} && !{1}_.Equals(other.{1}_))) return false;",
                             PropertyName, Name);
        }

        public override void WriteToString(TextGenerator writer)
        {
            writer.WriteLine("PrintField(\"{0}\", has{1}, {2}_, writer);", Descriptor.Name, PropertyName, Name);
        }
    }
}