import asyncio
import sys
import io
import os
import json
import traceback
from schemas.agent import ToolOutput

MAX_EXECUTION_TIME = 15
MAX_OUTPUT_SIZE = 10000


async def execute_python(code: str) -> ToolOutput:
    if not code:
        return ToolOutput(tool_name="python", output="", error="No code provided", latency_ms=0)
    local_vars = {}
    stdout_capture = io.StringIO()
    stderr_capture = io.StringIO()
    old_stdout = sys.stdout
    old_stderr = sys.stderr
    try:
        sys.stdout = stdout_capture
        sys.stderr = stderr_capture
        compiled = compile(code.strip(), "<agent_exec>", "exec", flags=0)
        loop = asyncio.get_running_loop()

        def run_code():
            try:
                exec(compiled, {"__builtins__": __builtins__, "os": os, "json": json}, local_vars)
            except Exception:
                traceback.print_exc()

        try:
            await asyncio.wait_for(loop.run_in_executor(None, run_code), timeout=MAX_EXECUTION_TIME)
        except asyncio.TimeoutError:
            sys.stdout = old_stdout
            sys.stderr = old_stderr
            return ToolOutput(tool_name="python", output="", error=f"Execution timed out ({MAX_EXECUTION_TIME}s)", latency_ms=0)

        output = stdout_capture.getvalue()[:MAX_OUTPUT_SIZE]
        error = stderr_capture.getvalue()[:MAX_OUTPUT_SIZE]
        if error and not output:
            output = error
        return ToolOutput(tool_name="python", output=output or "(no output)", latency_ms=0)
    except SyntaxError as e:
        return ToolOutput(tool_name="python", output="", error=f"SyntaxError: {e}", latency_ms=0)
    except Exception as e:
        return ToolOutput(tool_name="python", output="", error=f"{type(e).__name__}: {e}", latency_ms=0)
    finally:
        sys.stdout = old_stdout
        sys.stderr = old_stderr