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1from fastapi import FastAPI, HTTPException, Header
2from pydantic import BaseModel
3from typing import Optional
4import uuid
5import time
6 
7app = FastAPI()
8 
9users = {}
10tokens = {}
11pets = {}
12applications = {}
13pet_id_counter = 1
14app_id_counter = 1
15user_id_counter = 1
16 
17pets_data = [
18    {"species": "Dog", "breed": "Golden Retriever", "age": 3, "photo_url": "https://example.com/dog1.jpg", "available": True},
19    {"species": "Cat", "breed": "Siamese", "age": 2, "photo_url": "https://example.com/cat1.jpg", "available": True},
20    {"species": "Dog", "breed": "Beagle", "age": 5, "photo_url": "https://example.com/dog2.jpg", "available": True},
21    {"species": "Rabbit", "breed": "Holland Lop", "age": 1, "photo_url": "https://example.com/rabbit1.jpg", "available": True},
22    {"species": "Cat", "breed": "Maine Coon", "age": 4, "photo_url": "https://example.com/cat2.jpg", "available": False},
23]
24 
25for p in pets_data:
26    pets[pet_id_counter] = p
27    pet_id_counter += 1
28 
29class SignupRequest(BaseModel):
30    username: str
31    password: str
32 
33class LoginRequest(BaseModel):
34    username: str
35    password: str
36 
37class AdoptionApplication(BaseModel):
38    user_id: int
39    pet_id: int
40    applicant_name: str
41    applicant_email: str
42    applicant_phone: str
43 
44def get_current_user(authorization: str = Header(None)):
45    if not authorization:
46        raise HTTPException(status_code=401, detail="Missing auth header")
47    token = authorization.replace("Bearer ", "")
48    if token not in tokens:
49        raise HTTPException(status_code=401, detail="Invalid token")
50    user_id = tokens[token]
51    if user_id not in users:
52        raise HTTPException(status_code=401, detail="User not found")
53    return user_id
54 
55@app.post("/signup")
56def signup(req: SignupRequest):
57    global user_id_counter
58    if req.username in [u["username"] for u in users.values()]:
59        raise HTTPException(status_code=400, detail="Username already exists")
60    user_id = user_id_counter
61    users[user_id] = {"username": req.username, "password": req.password}
62    user_id_counter += 1
63    return {"user_id": user_id, "message": "User created"}
64 
65@app.post("/login")
66def login(req: LoginRequest):
67    for uid, u in users.items():
68        if u["username"] == req.username and u["password"] == req.password:
69            token = str(uuid.uuid4())
70            tokens[token] = uid
71            return {"token": token}
72    raise HTTPException(status_code=401, detail="Invalid credentials")
73 
74@app.get("/pets")
75def get_pets():
76    result = []
77    for pid, p in pets.items():
78        result.append({
79            "id": pid,
80            "species": p["species"],
81            "breed": p["breed"],
82            "age": p["age"],
83            "photo_url": p["photo_url"]
84        })
85    return result
86 
87@app.post("/applications")
88def submit_application(appl: AdoptionApplication, authorization: str = Header(None)):
89    get_current_user(authorization)
90    global app_id_counter
91    if appl.pet_id not in pets:
92        raise HTTPException(status_code=404, detail="Pet not found")
93    app_id = app_id_counter
94    applications[app_id] = {
95        "id": app_id,
96        "user_id": appl.user_id,
97        "pet_id": appl.pet_id,
98        "applicant_name": appl.applicant_name,
99        "applicant_email": appl.applicant_email,
100        "applicant_phone": appl.applicant_phone,
101        "status": "pending",
102        "created_at": time.time()
103    }
104    pets[appl.pet_id]["available"] = False
105    app_id_counter += 1
106    return {"application_id": app_id, "message": "Application submitted"}
107 
108@app.get("/pets/{pet_id}/status")
109def get_pet_status(pet_id: int):
110    if pet_id not in pets:
111        raise HTTPException(status_code=404, detail="Pet not found")
112    p = pets[pet_id]
113    status = "available" if p["available"] else "pending"
114    return {"pet_id": pet_id, "status": status}
115 
116@app.get("/users/{user_id}")
117def get_user(user_id: int, authorization: str = Header(None)):
118    get_current_user(authorization)
119    if user_id not in users:
120        raise HTTPException(status_code=404, detail="User not found")
121    return {"user_id": user_id, "username": users[user_id]["username"]}
122 
123@app.post("/users")
124def create_user(req: SignupRequest):
125    return signup(req)
126 
127@app.get("/applications/{application_id}")
128def get_application(application_id: int, authorization: str = Header(None)):
129    get_current_user(authorization)
130    if application_id not in applications:
131        raise HTTPException(status_code=404, detail="Application not found")
132    return applications[application_id]
133 
134@app.post("/applications")
135def create_application(appl: AdoptionApplication, authorization: str = Header(None)):
136    return submit_application(appl, authorization)

1fastapi
2uvicorn