from fastapi import APIRouter, Depends, HTTPException
from core.database import fake_users_db
from typing import Optional

router = APIRouter()

@router.post("/endpoint")
async def distance_handler(
    start_point: str,
    end_point: str,
    unit: Optional[str] = "km"
):
    """Calculate distance between two points"""
    if not start_point or not end_point:
        raise HTTPException(status_code=400, detail="Both start and end points are required")
    
    if unit not in ["km", "miles", "meters"]:
        raise HTTPException(status_code=400, detail="Invalid unit. Must be km, miles, or meters")
    
    # Demo calculation - would be replaced with actual distance calculation
    demo_distances = {
        "km": 100,
        "miles": 62.1371,
        "meters": 100000
    }
    
    return {
        "message": "Distance calculated successfully",
        "data": {
            "start_point": start_point,
            "end_point": end_point,
            "distance": demo_distances[unit],
            "unit": unit
        },
        "metadata": {
            "calculation_method": "demo",
            "accuracy": "approximate"
        }
    }