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1from fastapi import FastAPI, HTTPException, Header
2from datetime import datetime
3import secrets
4 
5app = FastAPI()
6 
7users = {}
8tokens = {}
9invoices = {}
10invoice_id_counter = 1
11edit_history = []
12 
13def get_current_user(authorization: str = Header(...)):
14    token = authorization.replace("Bearer ", "")
15    if token not in tokens:
16        raise HTTPException(status_code=401, detail="Invalid token")
17    return tokens[token]
18 
19def next_invoice_id():
20    global invoice_id_counter
21    current = invoice_id_counter
22    invoice_id_counter += 1
23    return current
24 
25@app.post("/signup")
26def signup(username: str, password: str):
27    if username in users:
28        raise HTTPException(status_code=400, detail="User exists")
29    users[username] = password
30    token = secrets.token_hex(16)
31    tokens[token] = username
32    return {"token": token}
33 
34@app.post("/login")
35def login(username: str, password: str):
36    if username not in users or users[username] != password:
37        raise HTTPException(status_code=401, detail="Invalid credentials")
38    token = secrets.token_hex(16)
39    tokens[token] = username
40    return {"token": token}
41 
42@app.post("/invoices")
43def create_invoice(authorization: str = Header(...)):
44    user = get_current_user(authorization)
45    inv_id = next_invoice_id()
46    invoices[inv_id] = {
47        "id": inv_id,
48        "client_name": "",
49        "line_items": [],
50        "discount": 0.0,
51        "payment_status": "unpaid",
52        "tax_rate": 0.0,
53        "created_by": user,
54        "created_at": datetime.now().isoformat()
55    }
56    return invoices[inv_id]
57 
58@app.get("/invoices/{invoice_id}")
59def get_invoice(invoice_id: int, authorization: str = Header(...)):
60    get_current_user(authorization)
61    if invoice_id not in invoices:
62        raise HTTPException(status_code=404, detail="Invoice not found")
63    return invoices[invoice_id]
64 
65@app.patch("/invoices/{invoice_id}")
66def update_invoice(invoice_id: int, client_name: str = None, line_items: list = None, discount: float = None, payment_status: str = None, tax_rate: float = None, authorization: str = Header(...)):
67    user = get_current_user(authorization)
68    if invoice_id not in invoices:
69        raise HTTPException(status_code=404, detail="Invoice not found")
70    old = invoices[invoice_id].copy()
71    if client_name is not None:
72        invoices[invoice_id]["client_name"] = client_name
73    if line_items is not None:
74        invoices[invoice_id]["line_items"] = line_items
75    if discount is not None:
76        invoices[invoice_id]["discount"] = discount
77    if payment_status is not None:
78        invoices[invoice_id]["payment_status"] = payment_status
79    if tax_rate is not None:
80        invoices[invoice_id]["tax_rate"] = tax_rate
81    edit_history.append({
82        "invoice_id": invoice_id,
83        "old": old,
84        "new": invoices[invoice_id].copy(),
85        "edited_by": user,
86        "edited_at": datetime.now().isoformat()
87    })
88    return invoices[invoice_id]
89 
90@app.get("/invoices/{invoice_id}/history")
91def get_invoice_history(invoice_id: int, authorization: str = Header(...)):
92    get_current_user(authorization)
93    return [h for h in edit_history if h["invoice_id"] == invoice_id]

1fastapi
2uvicorn