#include <daguerre.hpp>

namespace daguerre {

  image<hilbert_color> get_hilbert_framebuffer() {
    uint32_t width, height, pitch;
    hilbert_color *ptr = __euler_get_framebuffer(width, height, pitch);
    return image<hilbert_color>(ptr, width, height, pitch, false);
  }

  unsigned read_text_int(std::FILE *input) {
    unsigned n = 0;
    char ch;
    while (true) {
      std::fread(&ch, 1, 1, input);
      if (ch < '0' || ch > '9')
        return n;
      n = n * 10 + ch - '0';
    }
  }

  bool try_load_ppm(std::FILE *input, image<rgb24> &into) {

    char header[3];
    if (std::fread(header, 1, 3, input) != 3)
      return false;

    if (header[0] != 'P' || header[1] != '6' || header[2] != '\n')
      return false;

    unsigned width = read_text_int(input);
    unsigned height = read_text_int(input);
    unsigned max = read_text_int(input);

    into = image<rgb24>(width, height);

    for (unsigned y = 0; y < height; ++y)
      for (unsigned x = 0; x < width; ++x) {
        if (std::fread(&into.buffer[y * width + x].r, 1, 1, input) != 1)
          return false;
        if (std::fread(&into.buffer[y * width + x].g, 1, 1, input) != 1)
          return false;
        if (std::fread(&into.buffer[y * width + x].b, 1, 1, input) != 1)
          return false;
      }

    if (max != 255)
      for (unsigned v = 0; v < width * height; ++v) {
        into.buffer[v].r = ((uint16_t)into.buffer[v].r * 255) / max;
        into.buffer[v].g = ((uint16_t)into.buffer[v].g * 255) / max;
        into.buffer[v].b = ((uint16_t)into.buffer[v].b * 255) / max;
      }

    return true;

  }

}