#pragma once

#include <stddef.h>
#include <stdint.h>

namespace palette {

constexpr uint16_t rgb565(uint8_t red, uint8_t green, uint8_t blue) {
  return (static_cast<uint16_t>(red & 0xF8) << 8) |
         (static_cast<uint16_t>(green & 0xFC) << 3) | (blue >> 3);
}

constexpr uint16_t kOtherGrey = rgb565(176, 176, 176);

constexpr uint16_t kHues[] = {0, 30, 60, 120, 180, 225, 270, 300, 330};
constexpr uint16_t kColors[] = {
    rgb565(255, 128, 128), rgb565(255, 191, 128), rgb565(255, 255, 128),
    rgb565(128, 255, 128), rgb565(128, 255, 255), rgb565(128, 159, 255),
    rgb565(191, 128, 255), rgb565(255, 128, 255), rgb565(255, 128, 191),
};

inline int indexForHue(uint16_t hue) {
  for (size_t index = 0; index < sizeof(kHues) / sizeof(kHues[0]); ++index) {
    if (kHues[index] == hue) return static_cast<int>(index);
  }
  return -1;
}

}  // namespace palette