# src/shader_manager.py
import OpenGL.GL as gl

class ShaderManager:
 def __init__(self):
  pass

 def compile_shader(self, vertex_src: str, fragment_src: str) -> int:
  program = gl.glCreateProgram()
  
  def _compile(src, shader_type):
   shader = gl.glCreateShader(shader_type)
   gl.glShaderSource(shader, src)
   gl.glCompileShader(shader)
   
   if not gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS):
    info_log = gl.glGetShaderInfoLog(shader)
    if hasattr(info_log, "decode"):
     info_log = info_log.decode()
    raise RuntimeError(f"Shader compilation failed: {info_log}")
   return shader

  vert_shader = _compile(vertex_src, gl.GL_VERTEX_SHADER)
  frag_shader = _compile(fragment_src, gl.GL_FRAGMENT_SHADER)
  
  gl.glAttachShader(program, vert_shader)
  gl.glAttachShader(program, frag_shader)
  gl.glLinkProgram(program)
  
  if not gl.glGetProgramiv(program, gl.GL_LINK_STATUS):
   info_log = gl.glGetProgramInfoLog(program)
   if hasattr(info_log, "decode"):
    info_log = info_log.decode()
   raise RuntimeError(f"Program linking failed: {info_log}")
  
  # Optional: delete shaders as they are linked into the program
  gl.glDeleteShader(vert_shader)
  gl.glDeleteShader(frag_shader)
  
  return program