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1from fastapi import FastAPI, HTTPException, Header
2from datetime import datetime, timedelta
3import secrets
4import math
5 
6app = FastAPI()
7 
8users = {}
9tokens = {}
10spots = {
11    1: {"id": 1, "name": "Downtown Garage", "price_per_hour": 5.0, "distance_km": 0.5, "available": True},
12    2: {"id": 2, "name": "Mall Parking", "price_per_hour": 3.0, "distance_km": 1.2, "available": True},
13    3: {"id": 3, "name": "Airport Lot B", "price_per_hour": 8.0, "distance_km": 0.1, "available": True},
14    4: {"id": 4, "name": "Street Parking 5th Ave", "price_per_hour": 2.5, "distance_km": 0.8, "available": True},
15}
16reservations = {}
17next_user_id = 1
18next_reservation_id = 1
19 
20def get_current_user(authorization: str = Header(None)):
21    if not authorization:
22        raise HTTPException(status_code=401, detail="Missing auth header")
23    token = authorization.replace("Bearer ", "")
24    if token not in tokens:
25        raise HTTPException(status_code=401, detail="Invalid token")
26    return tokens[token]
27 
28@app.post("/signup")
29def signup(username: str, password: str):
30    global next_user_id
31    for user in users.values():
32        if user["username"] == username:
33            raise HTTPException(status_code=400, detail="Username taken")
34    user_id = next_user_id
35    next_user_id += 1
36    users[user_id] = {"id": user_id, "username": username, "password": password}
37    return {"id": user_id, "username": username}
38 
39@app.post("/login")
40def login(username: str, password: str):
41    for user in users.values():
42        if user["username"] == username and user["password"] == password:
43            token = secrets.token_hex(16)
44            tokens[token] = user["id"]
45            return {"token": token}
46    raise HTTPException(status_code=401, detail="Invalid credentials")
47 
48@app.get("/spots")
49def get_spots(authorization: str = Header(None)):
50    user_id = get_current_user(authorization)
51    available = [s for s in spots.values() if s["available"]]
52    return available
53 
54@app.get("/spots/{spot_id}")
55def get_spot(spot_id: int, authorization: str = Header(None)):
56    user_id = get_current_user(authorization)
57    if spot_id not in spots:
58        raise HTTPException(status_code=404, detail="Spot not found")
59    return spots[spot_id]
60 
61@app.post("/reserve")
62def reserve_spot(spot_id: int, authorization: str = Header(None)):
63    global next_reservation_id
64    user_id = get_current_user(authorization)
65    if spot_id not in spots:
66        raise HTTPException(status_code=404, detail="Spot not found")
67    if not spots[spot_id]["available"]:
68        raise HTTPException(status_code=400, detail="Spot not available")
69    spots[spot_id]["available"] = False
70    reservation_id = next_reservation_id
71    next_reservation_id += 1
72    now = datetime.utcnow()
73    reservations[reservation_id] = {
74        "id": reservation_id,
75        "user_id": user_id,
76        "spot_id": spot_id,
77        "start_time": now,
78        "expires_at": now + timedelta(minutes=30),
79        "active": True
80    }
81    return {"reservation_id": reservation_id, "expires_at": reservations[reservation_id]["expires_at"]}
82 
83@app.get("/reserve/{reservation_id}")
84def get_reservation(reservation_id: int, authorization: str = Header(None)):
85    user_id = get_current_user(authorization)
86    if reservation_id not in reservations:
87        raise HTTPException(status_code=404, detail="Reservation not found")
88    return reservations[reservation_id]
89 
90@app.get("/history")
91def get_history(authorization: str = Header(None)):
92    user_id = get_current_user(authorization)
93    user_reservations = []
94    for r in reservations.values():
95        if r["user_id"] == user_id:
96            spot = spots[r["spot_id"]]
97            start = r["start_time"]
98            end = r["expires_at"]
99            duration_hours = (end - start).total_seconds() / 3600
100            total_cost = round(duration_hours * spot["price_per_hour"], 2)
101            user_reservations.append({
102                "id": r["id"],
103                "spot_id": r["spot_id"],
104                "spot_name": spot["name"],
105                "start_time": start,
106                "expires_at": end,
107                "duration_hours": round(duration_hours, 2),
108                "total_cost": total_cost,
109                "active": r["active"]
110            })
111    return user_reservations

1fastapi
2uvicorn