/*
* File name: render.cpp
* Author: lejulien
* Date created: 10-01-2026 21:49:04
// Date modified: 12-01-2026 21:54:56
* ------
*/

#include "../includes/render.hpp"

#include "raylib.h"
#include <cmath>

// Constructor

Render::Render(int cell_size) : cell_size_(cell_size) {}

// Display function

int HSVtoHex(float h) {
  float r, g, b;
  int i = int(h / 60) % 6;
  float f = (h / 60) - i;
  float p = 0.0f;
  float q = 1.0f - f;
  float t = f;

  switch (i) {
  case 0:
    r = 1.0f, g = t, b = p;
    break;
  case 1:
    r = q, g = 1.0f, b = p;
    break;
  case 2:
    r = p, g = 1.0f, b = t;
    break;
  case 3:
    r = p, g = q, b = 1.0f;
    break;
  case 4:
    r = t, g = p, b = 1.0f;
    break;
  default:
    r = 1.0f, g = p, b = q;
    break;
  }

  int R = static_cast<int>(r * 255);
  int G = static_cast<int>(g * 255);
  int B = static_cast<int>(b * 255);

  return (R << 24) | (G << 16) | (B << 8) | 255; // Return as 0xRRGGBB integer
}

void Render::display_world(std::vector<bool> *data, int width, int height) {
  float maxDist =
      std::sqrt((width - 1) * (width - 1) + (height - 1) * (height - 1));
  for (int j = 0; j < height; j++) {
    for (int i = 0; i < width; i++) {
      if ((*data)[i + j * width]) {
        float dist = std::sqrt(i * i + j * j);
        float factor = dist / maxDist;
        float hue = factor * 360.0f; // Map to 0-360 degrees
        DrawRectangle(i * cell_size_, j * cell_size_, cell_size_, cell_size_,
                      GetColor(HSVtoHex(hue)));
      }
    }
  }
}

// Render loop

void Render::display(std::shared_ptr<World> world) {
  display_world(world->getWorldData(), world->getWidth(), world->getHeight());
}

void Render::updateCellSize(int new_size) { cell_size_ = new_size; }