---

from fastapi import FastAPI

app = FastAPI()

users = {}
notes = {}

# создать пользователя
@app.post("/register")
def register(username: str, password: str):
    if username in users:
        return {"msg": "user exists"}
    
    users[username] = password
    notes[username] = []
    return {"msg": "ok"}


# логин
@app.post("/login")
def login(username: str, password: str):
    if username in users:
        if users[username] == password:
            return {"msg": "login ok"}
    
    return {"msg": "error"}


# получить заметки
@app.get("/notes")
def get_notes(username: str):
    if username in notes:
        return notes[username]
    
    return {"msg": "no user"}


# добавить заметку
@app.post("/add_note")
def add_note(username: str, text: str):
    if username in notes:
        notes[username].append(text)
        return {"msg": "added"}
    
    return {"msg": "no user"}


# удалить заметку
@app.post("/delete_note")
def delete_note(username: str, index: int):
    if username in notes:
        if index < len(notes[username]):
            notes[username].pop(index)
            return {"msg": "deleted"}
    
    return {"msg": "error"}


# изменить заметку
@app.post("/edit_note")
def edit_note(username: str, index: int, text: str):
    if username in notes:
        if index < len(notes[username]):
            notes[username][index] = text
            return {"msg": "edited"}
    
    return {"msg": "error"}