#include "utils.hpp"

#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"

#include <iostream>
#include <chrono>


void writeImage(const tp::Buffer2D<tp::RGBA>& output, const char* name) {
  using namespace tp;

  // Save the data to a PNG file
  struct urgb {
    uint1 r, g, b, a;
  };

  Buffer2D<urgb> converted;
  converted.reserve(output.size());

  for (Index i = 0; i < output.size().x; i++) {
    for (Index j = 0; j < output.size().y; j++) {
      converted.get({ i, j }).r = uint1(output.get({ i, j }).r * 255);
      converted.get({ i, j }).g = uint1(output.get({ i, j }).g * 255);
      converted.get({ i, j }).b = uint1(output.get({ i, j }).b * 255);
      converted.get({ i, j }).a = uint1(output.get({ i, j }).a * 255);
    }
  }

  if (stbi_write_png(name, converted.size().x, converted.size().y, 4, converted.getBuff(), converted.size().x * 4) != 0) {
    // Image saved successfully
    printf("Image saved successfully.\n");
  } else {
    printf("Error saving the image.\n");
  }
}


TimeMs timeDeltaMs(const TimePoint& point) {
  auto timeDelta = std::chrono::system_clock::now() - point;
  auto timeDelayMs = std::chrono::duration_cast<std::chrono::milliseconds>(timeDelta).count();
  return timeDelayMs;
}

std::vector<char> readFile(const std::string &fileName) {
  std::ifstream file(fileName, std::ios::ate | std::ios::binary);

  if (!file.is_open()) {
    throw std::runtime_error("cannot open file");
  }

  size_t fileSize = (size_t) file.tellg();
  std::vector<char> buffer(fileSize);

  file.seekg(0);
  file.read(buffer.data(), (std::streamsize) fileSize);

  file.close();

  return buffer;
}