//===-- RPCServerHeaderEmitter.cpp ----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "RPCServerHeaderEmitter.h"
#include "RPCCommon.h"

#include "clang/AST/AST.h"
#include "clang/AST/Mangle.h"
#include "clang/Frontend/CompilerInstance.h"

#include "llvm/ADT/StringRef.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/raw_ostream.h"

using namespace clang;
using namespace lldb_rpc_gen;

void RPCServerHeaderEmitter::EmitMethod(const Method &method) {
  // We'll be using the mangled name in order to disambiguate
  // overloaded methods.
  const std::string &MangledName = method.MangledName;

  EmitLine("class " + MangledName +
           " : public rpc_common::RPCFunctionInstance {");
  EmitLine("public:");
  IndentLevel++;
  EmitConstructor(MangledName);
  EmitDestructor(MangledName);
  EmitHandleRPCCall();
  IndentLevel--;
  EmitLine("};");
}

void RPCServerHeaderEmitter::EmitHandleRPCCall() {
  EmitLine("bool HandleRPCCall(rpc_common::Connection &connection, "
           "rpc_common::RPCStream &send, rpc_common::RPCStream &response) "
           "override;");
}

void RPCServerHeaderEmitter::EmitConstructor(const std::string &MangledName) {
  EmitLine(MangledName + "() : RPCFunctionInstance(\"" + MangledName +
           "\") {}");
}

void RPCServerHeaderEmitter::EmitDestructor(const std::string &MangledName) {
  EmitLine("~" + MangledName + "() override {}");
}

std::string RPCServerHeaderEmitter::GetHeaderGuard() {
  const std::string UpperFilenameNoExt =
      llvm::sys::path::stem(
          llvm::sys::path::filename(OutputFile->getFilename()))
          .upper();
  return "GENERATED_LLDB_RPC_SERVER_" + UpperFilenameNoExt + "_H";
}

void RPCServerHeaderEmitter::Begin() {
  const std::string HeaderGuard = GetHeaderGuard();
  EmitLine("#ifndef " + HeaderGuard);
  EmitLine("#define " + HeaderGuard);
  EmitLine("");
  EmitLine("#include <lldb-rpc/common/RPCFunction.h>");
  EmitLine("");
  EmitLine("namespace rpc_server {");
}

void RPCServerHeaderEmitter::End() {
  EmitLine("} // namespace rpc_server");
  EmitLine("#endif // " + GetHeaderGuard());
}