//
// Copyright (c) 2008 Advanced Micro Devices, Inc. All rights reserved.
//

#include <string>
#include <sstream>
#include <fstream>
#include <iostream>

#include "os/os.hpp"
#include "device/gpu/gpudevice.hpp"
#include "device/gpu/gpuprogram.hpp"
#include "device/gpu/gpukernel.hpp"
#include "utils/options.hpp"
#include <cstdio>

// CLC_IN_PROCESS_CHANGE
extern int openclFrontEnd(const char* cmdline, std::string*, std::string* typeInfo = NULL);

namespace gpu {

static int programsCount = 0;

bool NullProgram::compileImpl(const std::string& src,
                              const std::vector<const std::string*>& headers,
                              const char** headerIncludeNames, amd::option::Options* options) {
  std::string sourceCode = src;

  if (dev().settings().debugFlags_ & Settings::CheckForILSource) {
    size_t inc = sourceCode.find("il_cs_", 0);
    if (inc != std::string::npos) {
      // CL program is an IL program
      ilProgram_ = sourceCode;
      return true;
    }
  }


  std::string tempFolder = amd::Os::getTempPath();
  std::string tempFileName = amd::Os::getTempFileName();

  if (dev().settings().debugFlags_ & Settings::StubCLPrograms) {
    std::stringstream fileName;
    std::fstream stubRead;
    // Dump the IL function
    fileName << "program_" << programsCount++ << ".cl";
    stubRead.open(fileName.str().c_str(), (std::fstream::in | std::fstream::binary));
    // Check if we have OpenCL program
    if (stubRead.is_open()) {
      // Find the stream size
      stubRead.seekg(0, std::fstream::end);
      size_t size = stubRead.tellg();
      stubRead.seekg(0, std::ios::beg);

      char* data = new char[size];
      stubRead.read(data, size);
      stubRead.close();

      sourceCode.assign(data, size);
      delete[] data;
    } else {
      std::fstream stubWrite;
      stubWrite.open(fileName.str().c_str(), (std::fstream::out | std::fstream::binary));
      stubWrite << sourceCode;
      stubWrite.close();
    }
  }

  std::fstream f;
  std::vector<std::string> headerFileNames(headers.size());
  std::vector<std::string> newDirs;
  for (size_t i = 0; i < headers.size(); ++i) {
    std::string headerPath = tempFolder;
    std::string headerIncludeName(headerIncludeNames[i]);
    // replace / in path with current os's file separator
    if (amd::Os::fileSeparator() != '/') {
      for (auto& it : headerIncludeName) {
        if (it == '/') it = amd::Os::fileSeparator();
      }
    }
    size_t pos = headerIncludeName.rfind(amd::Os::fileSeparator());
    if (pos != std::string::npos) {
      headerPath += amd::Os::fileSeparator();
      headerPath += headerIncludeName.substr(0, pos);
      headerIncludeName = headerIncludeName.substr(pos + 1);
    }
    if (!amd::Os::pathExists(headerPath)) {
      bool ret = amd::Os::createPath(headerPath);
      assert(ret && "failed creating path!");
      newDirs.push_back(headerPath);
    }
    std::string headerFullName = headerPath + amd::Os::fileSeparator() + headerIncludeName;
    headerFileNames[i] = headerFullName;
    f.open(headerFullName.c_str(), std::fstream::out);
    assert(!f.fail() && "failed creating header file!");
    f.write(headers[i]->c_str(), headers[i]->length());
    f.close();
  }

  acl_error err;
  const aclTargetInfo& targInfo = info();

  aclBinaryOptions binOpts = {0};
  binOpts.struct_size = sizeof(binOpts);
  binOpts.elfclass = targInfo.arch_id == aclAMDIL64 ? ELFCLASS64 : ELFCLASS32;
  binOpts.bitness = ELFDATA2LSB;
  binOpts.alloc = &::malloc;
  binOpts.dealloc = &::free;

  aclBinary* bin = aclBinaryInit(sizeof(aclBinary), &targInfo, &binOpts, &err);
  if (err != ACL_SUCCESS) {
    LogWarning("aclBinaryInit failed");
    return false;
  }

  if (ACL_SUCCESS !=
      aclInsertSection(dev().amdilCompiler(), bin, sourceCode.c_str(), sourceCode.size(), aclSOURCE)) {
    LogWarning("aclInsertSection failed");
    aclBinaryFini(bin);
    return false;
  }

  // temporary solution to synchronize buildNo between runtime and complib
  // until we move runtime inside complib
  ((amd::option::Options*)bin->options)->setBuildNo(options->getBuildNo());

  std::stringstream opts;
  std::string token;
  opts << options->origOptionStr.c_str();

  if (options->origOptionStr.find("-cl-std=CL") == std::string::npos) {
    switch (dev().settings().oclVersion_) {
      case OpenCL10:
        opts << " -cl-std=CL1.0";
        break;
      case OpenCL11:
        opts << " -cl-std=CL1.1";
        break;
      case OpenCL20:
      case OpenCL21:
      default:
      case OpenCL12:
        opts << " -cl-std=CL1.2";
        break;
    }
  }

  // FIXME: Should we prefix everything with -Wf,?
  std::istringstream iss(options->clcOptions);
  while (getline(iss, token, ' ')) {
    if (!token.empty()) {
      // Check if this is a -D option
      if (token.compare("-D") == 0) {
        // It is, skip payload
        getline(iss, token, ' ');
        continue;
      }
      opts << " -Wf," << token;
    }
  }

  if (!headers.empty()) {
    opts << " -I" << tempFolder;
  }

  if (!dev().settings().imageSupport_) {
    opts << " -fno-image-support";
  }

  if (dev().settings().reportFMAF_) {
    opts << " -mfast-fmaf";
  }

  if (dev().settings().reportFMA_) {
    opts << " -mfast-fma";
  }

  iss.clear();
  iss.str(device().info().extensions_);
  while (getline(iss, token, ' ')) {
    if (!token.empty()) {
      opts << " -D" << token << "=1";
    }
  }

  std::string newOpt = opts.str();
  size_t pos = newOpt.find("-fno-bin-llvmir");
  while (pos != std::string::npos) {
    newOpt.erase(pos, 15);
    pos = newOpt.find("-fno-bin-llvmir");
  }

  err = aclCompile(dev().amdilCompiler(), bin, newOpt.c_str(), ACL_TYPE_OPENCL, ACL_TYPE_LLVMIR_BINARY,
                   NULL);

  buildLog_ += aclGetCompilerLog(dev().amdilCompiler());

  if (err != ACL_SUCCESS) {
    LogWarning("aclCompile failed");
    aclBinaryFini(bin);
    return false;
  }

  size_t len = 0;
  const void* ir = aclExtractSection(dev().amdilCompiler(), bin, &len, aclLLVMIR, &err);
  if (err != ACL_SUCCESS) {
    LogWarning("aclExtractSection failed");
    aclBinaryFini(bin);
    return false;
  }

  llvmBinary_.assign(reinterpret_cast<const char*>(ir), len);
  elfSectionType_ = amd::OclElf::LLVMIR;
  aclBinaryFini(bin);

  for (size_t i = 0; i < headerFileNames.size(); ++i) {
    amd::Os::unlink(headerFileNames[i].c_str());
  }
  for (size_t i = 0; i < newDirs.size(); ++i) {
    amd::Os::removePath(newDirs[i]);
  }

#ifdef _WIN32
  amd::Os::unlink(tempFileName);
#endif

  if (clBinary()->saveSOURCE()) {
    clBinary()->elfOut()->addSection(amd::OclElf::SOURCE, sourceCode.data(), sourceCode.size());
  }
  if (clBinary()->saveLLVMIR()) {
    clBinary()->elfOut()->addSection(amd::OclElf::LLVMIR, llvmBinary_.data(), llvmBinary_.size(),
                                     false);
    // store the original compile options
    clBinary()->storeCompileOptions(compileOptions_);
  }

  return true;
}

int NullProgram::compileBinaryToIL(amd::option::Options* options) {
  acl_error err;
  const aclTargetInfo& targInfo = info();

  aclBinaryOptions binOpts = {0};
  binOpts.struct_size = sizeof(binOpts);
  binOpts.elfclass = targInfo.arch_id == aclAMDIL64 ? ELFCLASS64 : ELFCLASS32;
  binOpts.bitness = ELFDATA2LSB;
  binOpts.alloc = &::malloc;
  binOpts.dealloc = &::free;

  aclBinary* bin = aclBinaryInit(sizeof(aclBinary), &targInfo, &binOpts, &err);
  if (err != ACL_SUCCESS) {
    LogWarning("aclBinaryInit failed");
    return CL_BUILD_PROGRAM_FAILURE;
  }
  aclSections_0_8 spirFlag;
  _acl_type_enum_0_8 aclTypeBinaryUsed;
  if (std::string::npos != options->clcOptions.find("--spirv") ||
      elfSectionType_ == amd::OclElf::SPIRV) {
    spirFlag = aclSPIRV;
    aclTypeBinaryUsed = ACL_TYPE_SPIRV_BINARY;
  } else if (std::string::npos != options->clcOptions.find("--spir") ||
             elfSectionType_ == amd::OclElf::SPIR) {
    spirFlag = aclSPIR;
    aclTypeBinaryUsed = ACL_TYPE_SPIR_BINARY;
  } else {
    spirFlag = aclLLVMIR;
    aclTypeBinaryUsed = ACL_TYPE_LLVMIR_BINARY;
  }

  if (ACL_SUCCESS !=
      aclInsertSection(dev().amdilCompiler(), bin, llvmBinary_.data(), llvmBinary_.size(), spirFlag)) {
    LogWarning("aclInsertSection failed");
    aclBinaryFini(bin);
    return CL_BUILD_PROGRAM_FAILURE;
  }

  // pass kernel argument alignment info to compiler lib through option str
  std::string optionStr = options->origOptionStr;
  if (options->origOptionStr.find("kernel-arg-alignment") == std::string::npos) {
    char s[256];
    sprintf(s, " -Wb,-kernel-arg-alignment=%d", dev().info().memBaseAddrAlign_ / 8);
    optionStr += s;
  }

  // temporary solution to synchronize buildNo between runtime and complib
  // until we move runtime inside complib
  ((amd::option::Options*)bin->options)->setBuildNo(options->getBuildNo());

  aclType type = ACL_TYPE_CG;
  // If option bin-bif30 is set, generate BIF 3.0 binary
  if (options->oVariables->BinBIF30) {
    type = ACL_TYPE_ISA;
  }

  err = aclCompile(dev().amdilCompiler(), bin, optionStr.c_str(), aclTypeBinaryUsed, type, NULL);
  buildLog_ += aclGetCompilerLog(dev().amdilCompiler());

  if (err != ACL_SUCCESS) {
    LogWarning("aclCompile failed");
    aclBinaryFini(bin);
    return CL_BUILD_PROGRAM_FAILURE;
  }

  if (options->oVariables->BinBIF30) {
    acl_error err;
    char* binaryIn = nullptr;
    size_t size;
    err = aclWriteToMem(bin, reinterpret_cast<void**>(&binaryIn), &size);
    if (err != ACL_SUCCESS) {
      LogWarning("aclWriteToMem failed");
      aclBinaryFini(bin);
      return CL_BUILD_PROGRAM_FAILURE;
    }
    clBinary()->saveBIFBinary(binaryIn, size);
    aclFreeMem(bin, binaryIn);
  }

  size_t len = 0;
  const void* amdil = aclExtractSection(dev().amdilCompiler(), bin, &len, aclCODEGEN, &err);
  if (err != ACL_SUCCESS) {
    LogWarning("aclExtractSection failed");
    aclBinaryFini(bin);
    return CL_BUILD_PROGRAM_FAILURE;
  }

  ilProgram_.assign(reinterpret_cast<const char*>(amdil), len);
  aclBinaryFini(bin);

  return CL_SUCCESS;
}

}  // namespace gpu