from __future__ import annotations

import sys
from io import StringIO
from typing import Annotated

import gradio as gr

from app import _log_call_end, _log_call_start, _truncate_for_log


def Code_Interpreter(code: Annotated[str, "Python source code to run; stdout is captured and returned."]) -> str:
    _log_call_start("Code_Interpreter", code=_truncate_for_log(code or "", 300))
    if code is None:
        result = "No code provided."
        _log_call_end("Code_Interpreter", result)
        return result
    old_stdout = sys.stdout
    redirected_output = sys.stdout = StringIO()
    try:
        exec(code)
        result = redirected_output.getvalue()
    except Exception as exc:  # pylint: disable=broad-except
        result = str(exc)
    finally:
        sys.stdout = old_stdout
    _log_call_end("Code_Interpreter", _truncate_for_log(result))
    return result


def build_interface() -> gr.Interface:
    return gr.Interface(
        fn=Code_Interpreter,
        inputs=gr.Code(label="Python Code", language="python"),
        outputs=gr.Textbox(label="Output", lines=5, max_lines=20),
        title="Code Interpreter",
        description="<div style=\"text-align:center\">Execute Python code and see the output.</div>",
        api_description=(
            "Execute arbitrary Python code and return captured stdout or an error message. "
            "Supports any valid Python code including imports, variables, functions, loops, and calculations. "
            "Examples: 'print(2+2)', 'import math; print(math.sqrt(16))', 'for i in range(3): print(i)'. "
            "Parameters: code (str - Python source code to execute). "
            "Returns: Combined stdout output or exception text if execution fails."
        ),
        flagging_mode="never",
    )


__all__ = ["Code_Interpreter", "build_interface"]