#pragma once

#include <Arduino.h>

// Compact 5x7 uppercase Cyrillic font. Lowercase UTF-8 letters are deliberately
// rendered with the same uppercase glyphs: at 5x7 pixels this is considerably
// clearer than trying to preserve lowercase shapes.
namespace CyrillicFont {

constexpr uint8_t WIDTH = 5;
constexpr uint8_t HEIGHT = 7;
constexpr uint8_t ADVANCE = 6;

// Rows are stored top-to-bottom; the low five bits are pixels left-to-right.
const uint8_t GLYPHS[][HEIGHT] PROGMEM = {
  {0x0E, 0x11, 0x11, 0x1F, 0x11, 0x11, 0x11}, // А
  {0x1F, 0x10, 0x10, 0x1E, 0x11, 0x11, 0x1E}, // Б
  {0x1E, 0x11, 0x11, 0x1E, 0x11, 0x11, 0x1E}, // В
  {0x1F, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10}, // Г
  {0x0E, 0x0A, 0x0A, 0x0A, 0x11, 0x1F, 0x11}, // Д
  {0x1F, 0x10, 0x10, 0x1E, 0x10, 0x10, 0x1F}, // Е
  {0x15, 0x15, 0x0E, 0x04, 0x0E, 0x15, 0x15}, // Ж
  {0x0E, 0x11, 0x01, 0x06, 0x01, 0x11, 0x0E}, // З
  {0x11, 0x13, 0x15, 0x15, 0x19, 0x11, 0x11}, // И
  {0x0A, 0x11, 0x13, 0x15, 0x19, 0x11, 0x11}, // Й
  {0x11, 0x12, 0x14, 0x18, 0x14, 0x12, 0x11}, // К
  {0x07, 0x09, 0x09, 0x09, 0x11, 0x11, 0x11}, // Л
  {0x11, 0x1B, 0x15, 0x15, 0x11, 0x11, 0x11}, // М
  {0x11, 0x11, 0x11, 0x1F, 0x11, 0x11, 0x11}, // Н
  {0x0E, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0E}, // О
  {0x1F, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, // П
  {0x1E, 0x11, 0x11, 0x1E, 0x10, 0x10, 0x10}, // Р
  {0x0F, 0x10, 0x10, 0x10, 0x10, 0x10, 0x0F}, // С
  {0x1F, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04}, // Т
  {0x11, 0x11, 0x11, 0x0F, 0x01, 0x11, 0x0E}, // У
  {0x04, 0x0E, 0x15, 0x15, 0x0E, 0x04, 0x04}, // Ф
  {0x11, 0x11, 0x0A, 0x04, 0x0A, 0x11, 0x11}, // Х
  {0x12, 0x12, 0x12, 0x12, 0x12, 0x1E, 0x01}, // Ц
  {0x11, 0x11, 0x11, 0x0F, 0x01, 0x01, 0x01}, // Ч
  {0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x1F}, // Ш
  {0x15, 0x15, 0x15, 0x15, 0x15, 0x1E, 0x01}, // Щ
  {0x18, 0x08, 0x08, 0x0E, 0x09, 0x09, 0x0E}, // Ъ
  {0x11, 0x11, 0x11, 0x1D, 0x15, 0x15, 0x1D}, // Ы
  {0x10, 0x10, 0x10, 0x1E, 0x11, 0x11, 0x1E}, // Ь
  {0x0E, 0x11, 0x01, 0x07, 0x01, 0x11, 0x0E}, // Э
  {0x12, 0x15, 0x15, 0x1D, 0x15, 0x15, 0x12}, // Ю
  {0x0F, 0x11, 0x11, 0x0F, 0x05, 0x09, 0x11}  // Я
};

inline const uint8_t *glyph(uint32_t codepoint) {
  if (codepoint >= 0x0430U && codepoint <= 0x044FU) codepoint -= 0x20U;
  if (codepoint == 0x0401U || codepoint == 0x0451U) codepoint = 0x0415U; // Ё -> Е
  if (codepoint < 0x0410U || codepoint > 0x042FU) return nullptr;
  return GLYPHS[codepoint - 0x0410U];
}

}  // namespace CyrillicFont