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1from fastapi import FastAPI, HTTPException, Header
2from typing import Optional
3from datetime import datetime
4import secrets
5 
6app = FastAPI()
7 
8users = {}
9projects = {}
10tasks = {}
11tokens = {}
12user_ids = 1
13project_ids = 1
14task_ids = 1
15 
16def get_current_user(authorization: Optional[str] = Header(None)):
17    if not authorization:
18        raise HTTPException(status_code=401, detail="Missing auth header")
19    token = authorization.replace("Bearer ", "")
20    if token not in tokens:
21        raise HTTPException(status_code=401, detail="Invalid token")
22    return tokens[token]
23 
24@app.post("/signup")
25def signup(username: str, password: str):
26    global user_ids
27    if any(u["username"] == username for u in users.values()):
28        raise HTTPException(status_code=400, detail="Username taken")
29    user_id = user_ids
30    users[user_id] = {"id": user_id, "username": username, "password": password}
31    user_ids += 1
32    return {"id": user_id, "username": username}
33 
34@app.post("/login")
35def login(username: str, password: str):
36    for u in users.values():
37        if u["username"] == username and u["password"] == password:
38            token = secrets.token_hex(16)
39            tokens[token] = u["id"]
40            return {"token": token}
41    raise HTTPException(status_code=401, detail="Invalid credentials")
42 
43@app.get("/boards")
44def get_boards(authorization: Optional[str] = Header(None)):
45    current_user = get_current_user(authorization)
46    result = []
47    for pid, p in projects.items():
48        task_count = 0
49        completed_count = 0
50        last_activity = None
51        for t in tasks.values():
52            if t["project_id"] == pid:
53                task_count += 1
54                if t.get("completed"):
55                    completed_count += 1
56                if last_activity is None or t["created_at"] > last_activity:
57                    last_activity = t["created_at"]
58        result.append({
59            "id": pid,
60            "name": p["name"],
61            "task_count": task_count,
62            "completed_count": completed_count,
63            "last_activity": last_activity
64        })
65    return result
66 
67@app.post("/boards/{board_id}/tasks")
68def add_task(board_id: int, assignee: str, deadline: str, authorization: Optional[str] = Header(None)):
69    global task_ids
70    current_user = get_current_user(authorization)
71    if board_id not in projects:
72        raise HTTPException(status_code=404, detail="Board not found")
73    task = {
74        "id": task_ids,
75        "project_id": board_id,
76        "assignee": assignee,
77        "deadline": deadline,
78        "completed": False,
79        "created_at": datetime.utcnow().isoformat()
80    }
81    tasks[task_ids] = task
82    task_ids += 1
83    return task
84 
85@app.get("/{resource}/{id}")
86def get_resource(resource: str, id: int, authorization: Optional[str] = Header(None)):
87    current_user = get_current_user(authorization)
88    store = {"users": users, "projects": projects, "tasks": tasks}
89    if resource not in store:
90        raise HTTPException(status_code=404, detail="Resource not found")
91    item = store[resource].get(id)
92    if not item:
93        raise HTTPException(status_code=404, detail="Item not found")
94    return item
95 
96@app.post("/{resource}")
97def create_resource(resource: str, data: dict, authorization: Optional[str] = Header(None)):
98    global project_ids
99    current_user = get_current_user(authorization)
100    if resource == "projects":
101        if "name" not in data:
102            raise HTTPException(status_code=400, detail="Name required")
103        project = {"id": project_ids, "name": data["name"], "owner": current_user}
104        projects[project_ids] = project
105        project_ids += 1
106        return project
107    elif resource == "tasks":
108        global task_ids
109        if "project_id" not in data or "assignee" not in data or "deadline" not in data:
110            raise HTTPException(status_code=400, detail="Missing fields")
111        if data["project_id"] not in projects:
112            raise HTTPException(status_code=404, detail="Project not found")
113        task = {
114            "id": task_ids,
115            "project_id": data["project_id"],
116            "assignee": data["assignee"],
117            "deadline": data["deadline"],
118            "completed": data.get("completed", False),
119            "created_at": datetime.utcnow().isoformat()
120        }
121        tasks[task_ids] = task
122        task_ids += 1
123        return task
124    else:
125        raise HTTPException(status_code=400, detail="Unsupported resource")

1fastapi
2uvicorn