#pragma once

#include <GL/glew.h>
#include <GL/gl.h>
#include <string>
#include <map>
#include <vector>

/// For now, just 1 vertex's type can be attach to the program
/// In order add more than 1 vertex's type to the program, the shaders should be named (eg. "shader1", "shader2" & so on)
class CGLSLProgram
{
 public:
  enum SHADERTYPE {VERTEX = 0, FRAGMENT, GEOMETRY, TESSELATION};

  GLuint m_uIdProgram;		//id of the program
  GLuint m_vIdShader[4];	//ids of the loaded shaders; the 4th is empty always
  CGLSLProgram(void);
  ~CGLSLProgram(void);

  void loadShader(std::string strFileName, SHADERTYPE typeShader);
  void create();
  void create_link();
  void link();
  void enable();
  void disable();
  void addAttribute(std::string strParName);
  void addSubroutine(std::string strFunctionName, unsigned int iShaderType);
  void addUniform(std::string strParName);
  void addUniformSubroutine(std::string strParName, int iShaderType);
  GLint getLocation(std::string strParName);
  GLuint getId();
  void setSubroutine(std::string strUniformName, std::string strSubRoutine, int iShaderType);
  std::map<std::string, GLint> m_mapSubroutines;
  void recompileShader(std::string strFileName, SHADERTYPE typeShader);
 private:
  std::map<std::string, GLint> m_mapVarShader;
  std::vector<GLuint> m_vRoutinesIds;
  bool loadShaderFile(std::string strFilename, GLuint iHandle);
  void checkLinkingErrors();
};