# AI Disclosure: Code comments were generated with AI but manually checked for correctness.

class SimpleFStringNode:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "template": ("STRING", {
                    "multiline": True,
                    "default": "The value of x is {x}"
                }),
            },
            # We leave "optional" empty.
            # The JS will force new inputs into the node, and ComfyUI
            # will pass them to our function automatically.
            "optional": {}
        }

    RETURN_TYPES = ("STRING",)
    RETURN_NAMES = ("formatted_string",)
    FUNCTION = "format_inputs"
    CATEGORY = "DLWW/Text"

    # We use **kwargs to catch all the dynamic inputs created in the UI
    def format_inputs(self, template, **kwargs):
        clean_values = {}
        for key, val in kwargs.items():
            if val is None:
                clean_values[key] = "None"
            elif hasattr(val, 'shape'):
                clean_values[key] = f"Tensor {val.shape}"
            else:
                clean_values[key] = str(val)

        try:
            result = template.format(**clean_values)
        except KeyError as e:
            result = f"Error: Template uses {{{e.args[0]}}} but that input doesn't exist!"
        except Exception as e:
            result = f"Error: {str(e)}"

        print(f"\n[DEBUG F-String]: {result}\n")

        return {
            "ui": {"text": [result]},
            "result": (result,)
        }