for mat in bpy.data.materials:
    if not mat.use_nodes:
        continue
    nodes = mat.node_tree.nodes
    mix = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeMixShader)), None)
    while mix is not None:
        nodes.remove(mix)
        mix = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeMixShader)), None)
    emission = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeEmission)), None)
    while emission is not None:
        nodes.remove(emission)
        emission = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeEmission)), None)
    transparent = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeBsdfTransparent)), None)
    while transparent is not None:
        nodes.remove(transparent)
        transparent = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeBsdfTransparent)), None)
    light_path = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeLightPath)), None)
    while light_path is not None:
        nodes.remove(light_path)
        light_path = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeLightPath)), None)
    output = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeOutputMaterial)), None)
    if output is None:
        continue
    principled = nodes.new("ShaderNodeBsdfPrincipled")
    principled.location = (output.location[0] - 400, output.location[1] + 100)
    mat.node_tree.links.new(principled.outputs[0], output.inputs[0])
    texture = next((n for n in nodes if isinstance(n, bpy.types.ShaderNodeTexImage)), None)
    if texture is None:
        continue
    mat.node_tree.links.new(texture.outputs['Color'], principled.inputs['Base Color'])
    # Rename the material
    mat.name = "A_" + mat.name
    # Rename the image if the texture node exists
    if texture is not None and texture.image is not None:
        texture.image.name = "A_" + texture.image.name