#include "pokemon_instance.hpp"

static uint16_t _determine_stat(const uint32_t base_stat_value,
				const uint32_t determinant_value,
				const uint32_t stat_experience,
				const uint32_t level)
{
  const uint32_t x = base_stat_value + determinant_value;
  const uint32_t y = sqrt_ceil<uint16_t>(stat_experience) / 4;
  const uint32_t z = (x * 2 + y) * level;
  return (z / 100);
}

static_assert(_determine_stat(106, 0b0100, 0, 70) == (234 - 10 - 70));
static_assert(_determine_stat(110, 0b1110, 0, 70) == (178 - 5));
static_assert(_determine_stat( 90, 0b0101, 0, 70) == (138 - 5));
static_assert(_determine_stat(130, 0b1000, 0, 70) == (198 - 5));
static_assert(_determine_stat(154, 0b0110, 0, 70) == (229 - 5));

constexpr inline uint16_t
pokemon_instance_t::determine_stat(enum stat_t stat)
{
  switch (stat) {
  default:
  case stat_t::hit_points:
    return _determine_stat(pokemon[species].base_stat_values.hit_points,
			   determinant_values.hit_points(),
			   stat_experience.hit_points,
			   level)
      + 10 + level;
  case stat_t::attack:
    return _determine_stat(pokemon[species].base_stat_values.attack,
			   determinant_values.attack(),
			   stat_experience.attack,
			   level)
      + 5;
  case stat_t::defense:
    return _determine_stat(pokemon[species].base_stat_values.defense,
			   determinant_values.defense(),
			   stat_experience.defense,
			   level)
      + 5;
  case stat_t::speed:
    return _determine_stat(pokemon[species].base_stat_values.speed,
			   determinant_values.speed(),
			   stat_experience.speed,
			   level)
      + 5;
  case stat_t::special:
    return _determine_stat(pokemon[species].base_stat_values.special,
			   determinant_values.special(),
			   stat_experience.special,
			   level)
      + 5;
  }
}

constexpr inline uint16_t
pokemon_instance_t::learn_move(enum move_t::move move, int32_t index)
{
  switch (index) {
  case 0: [[fallthrough]];
  case 1: [[fallthrough]];
  case 2: [[fallthrough]];
  case 3:
    moves[index] = move;
    break;
  default:
    moves[0] = moves[1];
    moves[1] = moves[2];
    moves[2] = moves[3];
    moves[3] = move;
    break;
  }
}