from fastapi import FastAPI
from datetime import datetime
import calendar
from typing import Any

app = FastAPI()

@app.get(
    "/datetime",
    summary="Get Current Date and Time Information",
    description="""Returns the current date, time, weekday, and calendar week.
This endpoint provides time-related information in a structured JSON format
that can be used for various applications including logging, timestamps,
and scheduling.

**Response Fields:**
- `date` (string): Current date in YYYY-MM-DD format
- `time` (string): Current time in HH:MM:SS format
- `weekday` (string): Full weekday name (e.g., "Monday")
- `calendar_week` (integer): ISO calendar week number
""",
    tags=["datetime"],
    response_model=dict,
    response_description="Current date and time information"
)
async def get_datetime() -> dict[str, Any]:
    """
    Get current date and time information.

    Returns:
        dict: A dictionary containing current date, time, weekday, and calendar week
    """
    now = datetime.now()
    return {
        "date": now.strftime("%Y-%m-%d"),
        "time": now.strftime("%H:%M:%S"),
        "weekday": now.strftime("%A"),
        "calendar_week": now.isocalendar().week
    }

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)