#include "canvas/Circle.hpp"
#include "sunShader.hpp"

#include <raylib.h>
#include <rlgl.h>

RenderTexture2D Circle::target;
Shader Circle::shader;
float Circle::radius;
float Circle::start_transperency;
float Circle::c[3];
int Circle::radius_loc;
int Circle::start_transperency_loc;
int Circle::colorLoc;

void Circle::init()
{
#if defined(PLATFORM_ANDROID) || defined(PLATFORM_WEB)
  shader = LoadShaderFromMemory(0, sun_shader_100);
#else
  shader = LoadShaderFromMemory(0, (const char *)shaders_sun_330_fs);
#endif
  target = LoadRenderTexture(sizeTexute, sizeTexute);

  radius = 0.6f;
  radius_loc = GetShaderLocation(shader, "sun_radius");
  SetShaderValue(shader, radius_loc, &radius, SHADER_UNIFORM_FLOAT);

  start_transperency = 0.40f;
  start_transperency_loc = GetShaderLocation(shader, "start_transperency");
  SetShaderValue(shader, start_transperency_loc, &start_transperency, SHADER_UNIFORM_FLOAT);

  c[0] = 1.0f;
  c[1] = 1.0f;
  c[2] = 1.0f;
  colorLoc = GetShaderLocation(shader, "color");
  SetShaderValue(shader, colorLoc, c, SHADER_UNIFORM_VEC3);

  // resitev da ne postane tekstura okoli sonca transparentna in da se ne vidi nasledna slika
  // https://github.com/raysan5/raylib/issues/3820
  rlSetBlendFactorsSeparate(RL_SRC_ALPHA, RL_ONE_MINUS_SRC_ALPHA, RL_ONE, RL_ONE, RL_FUNC_ADD, RL_MAX);
}

void Circle::deinit()
{
  UnloadShader(shader);
  UnloadRenderTexture(target);
}

void Circle::setColor(Color color)
{
  c[0] = color.r / 255.0f;
  c[1] = color.g / 255.0f;
  c[2] = color.b / 255.0f;
  SetShaderValue(shader, colorLoc, c, SHADER_UNIFORM_VEC3);
}

void Circle::setSoftEdge(bool soft)
{
  if (soft)
  {
    radius = 0.6f;
  }
  else
  {
    radius = 1.0f;
  }
  SetShaderValue(shader, radius_loc, &radius, SHADER_UNIFORM_FLOAT);
}

void Circle::draw(float x, float y, float size)
{
  Rectangle dest = {x - size, y - size, size * 2, size * 2};
  Rectangle source = {0, 0, (float)target.texture.width, (float)-target.texture.height};
  Vector2 origin = {0.0f, 0.0f};

  // zgorni komentar da se mesanje barv oklopi pravilno
  BeginBlendMode(RL_BLEND_CUSTOM_SEPARATE);
  BeginShaderMode(shader);
  DrawTexturePro(target.texture, source, dest, origin, 0.0f, WHITE);
  EndShaderMode();
  EndBlendMode();
}