/*
* File name: rules.cpp
* Author: lejulien
* Date created: 10-01-2026 21:49:14
// Date modified: 12-01-2026 21:59:00
* ------
*/

#include "../includes/rules.hpp"
#include "../includes/world.hpp"

// Contructor

Rules::Rules() {}

// Private functions

void Rules::offset_coord(int &i, int &j) {
  if (i < 0) {
    i = this->_width - 1;
  } else if (i >= this->_width) {
    i = 0;
  }
  if (j < 0) {
    j = this->_height - 1;
  } else if (j >= this->_height) {
    j = 0;
  }
}

bool Rules::is_alive(int i, int j) {
  offset_coord(i, j);
  if (this->_buffer[i + j * this->_width])
    return true;
  return false;
}

void Rules::ortho_neighbors(int &neighbors, int i, int j) {
  // top
  if (is_alive(i, j - 1))
    neighbors++;
  // bottom
  if (is_alive(i, j + 1))
    neighbors++;
  // left
  if (is_alive(i - 1, j))
    neighbors++;
  // right
  if (is_alive(i + 1, j))
    neighbors++;
}

void Rules::diag_neighbors(int &neighbors, int i, int j) {
  // top-left
  if (is_alive(i - 1, j - 1))
    neighbors++;
  // top-right
  if (is_alive(i + 1, j - 1))
    neighbors++;
  // bottom-left
  if (is_alive(i - 1, j + 1))
    neighbors++;
  // bottom-right
  if (is_alive(i + 1, j + 1))
    neighbors++;
}

// Member function

void Rules::setup(std::shared_ptr<World> world) {
  _world = world;
  _width = world->getWidth();
  _height = world->getHeight();
}

void Rules::newWorld(std::shared_ptr<World> world) {
  _world = world;
  _width = world->getWidth();
  _height = world->getHeight();
}

void Rules::update() {
  int neighbors = 0;
  std::vector<bool> *world_data = _world->getWorldData();
  this->_buffer = *world_data;

  // apply the rules for each cells
  for (int j = 0; j < this->_height; j++) {
    for (int i = 0; i < this->_width; i++) {
      // count neighbors
      neighbors = 0;
      ortho_neighbors(neighbors, i, j);
      diag_neighbors(neighbors, i, j);

      // Apply the rules
      if (neighbors < 2 || neighbors > 3)
        (*world_data)[i + j * this->_width] = false;
      else if (neighbors == 3)
        (*world_data)[i + j * this->_width] = true;
    }
  }
}