/**
 ******************************************************************************
 * Xenia : Xbox 360 Emulator Research Project                                 *
 ******************************************************************************
 * Copyright 2015 Ben Vanik. All rights reserved.                             *
 * Released under the BSD license - see LICENSE in the root for more details. *
 ******************************************************************************
 */

#include "xenia/gpu/shader.h"

#include <cinttypes>
#include <cstring>

#include "xenia/base/filesystem.h"
#include "xenia/base/math.h"
#include "xenia/base/memory.h"
#include "xenia/base/string.h"
#include "xenia/gpu/ucode.h"

namespace xe {
namespace gpu {
using namespace ucode;

Shader::Shader(ShaderType shader_type, uint64_t ucode_data_hash,
               const uint32_t* ucode_dwords, size_t ucode_dword_count)
    : shader_type_(shader_type), ucode_data_hash_(ucode_data_hash) {
  // We keep ucode data in host native format so it's easier to work with.
  ucode_data_.resize(ucode_dword_count);
  xe::copy_and_swap(ucode_data_.data(), ucode_dwords, ucode_dword_count);
}

Shader::~Shader() = default;

std::string Shader::GetTranslatedBinaryString() const {
  std::string result;
  result.resize(translated_binary_.size());
  std::memcpy(const_cast<char*>(result.data()), translated_binary_.data(),
              translated_binary_.size());
  return result;
}

std::pair<std::string, std::string> Shader::Dump(const std::string& base_path,
                                                 const char* path_prefix) {
  // Ensure target path exists.
  auto target_path = xe::to_wstring(base_path);
  if (!target_path.empty()) {
    target_path = xe::to_absolute_path(target_path);
    xe::filesystem::CreateFolder(target_path);
  }

  char txt_file_name[kMaxPath];
  std::snprintf(txt_file_name, xe::countof(txt_file_name),
                "%s/shader_%s_%.16" PRIX64 ".%s", base_path.c_str(),
                path_prefix, ucode_data_hash_,
                shader_type_ == ShaderType::kVertex ? "vert" : "frag");
  FILE* f = fopen(txt_file_name, "wb");
  if (f) {
    fwrite(translated_binary_.data(), 1, translated_binary_.size(), f);
    fprintf(f, "\n\n");
    auto ucode_disasm_ptr = ucode_disassembly().c_str();
    while (*ucode_disasm_ptr) {
      auto line_end = std::strchr(ucode_disasm_ptr, '\n');
      fprintf(f, "// ");
      fwrite(ucode_disasm_ptr, 1, line_end - ucode_disasm_ptr + 1, f);
      ucode_disasm_ptr = line_end + 1;
    }
    fprintf(f, "\n\n");
    if (!host_disassembly_.empty()) {
      fprintf(f, "\n\n/*\n%s\n*/\n", host_disassembly_.c_str());
    }
    fclose(f);
  }

  char bin_file_name[kMaxPath];
  std::snprintf(bin_file_name, xe::countof(bin_file_name),
                "%s/shader_%s_%.16" PRIX64 ".bin.%s", base_path.c_str(),
                path_prefix, ucode_data_hash_,
                shader_type_ == ShaderType::kVertex ? "vert" : "frag");
  f = fopen(bin_file_name, "wb");
  if (f) {
    fwrite(ucode_data_.data(), 4, ucode_data_.size(), f);
    fclose(f);
  }

  return {std::string(txt_file_name), std::string(bin_file_name)};
}

}  //  namespace gpu
}  //  namespace xe