restapi.py

from fastapi import FastAPI,HTTPException
from typing import List, Optional
from enum import IntEnum, StrEnum
from pydantic import BaseModel, Field

class Priority(IntEnum):
    low=3
    medium=2
    high=1

class Status(StrEnum):
    p="Pending"
    c="Completed"

class To_do_Base(BaseModel):
    task:str=Field(...,min_length=3,max_length=50)
    description:str=Field(default='No description',min_length=3,max_length=75)
    priority:Priority=Field(default=Priority.low)
    status:Status=Field(default=Status.p)

class To_do(To_do_Base):
    id:int=Field(...,gt=0)

class To_do_update(BaseModel):
    task:Optional[str]=Field(None,min_length=3,max_length=50)
    description:Optional[str]=Field(None,min_length=3,max_length=75)
    priority:Optional[Priority]=Field(None)
    status:Optional[Status]=Field(None)

app=FastAPI()
todoslist = [
    To_do(id=1,task='Buy groceries',description='Milk, Bread, Eggs, and Butter',status=Status.p,priority=Priority.high),
    To_do(id=2,task='Clean the room',description='Organize desk and vacuum floor',status=Status.c,priority=Priority.medium),
    To_do(id=3,task='Finish math homework',description='Complete calculus assignment',status=Status.p,priority=Priority.high),
    To_do(id=4,task='Water the plants',description='Water all indoor plants',status=Status.p,priority=Priority.medium)
]


@app.get("/")
def greet():
    return 'Welcome To My RestAPI'

@app.get("/todos/{todoid}",response_model=To_do)
def gettodo(todoid:int):
    for i in todoslist:
        if i.id==todoid:
            return i
    raise HTTPException(status_code=404,detail='Task Not Found')

@app.get("/alltodos",response_model=List[To_do])
def getlist(n:int=None):
    if n:
        if n>len(todoslist):
            raise HTTPException(status_code=400,detail=f'The to-do list only has {len(todoslist)} tasks.')
        else:
            return todoslist[:n]
    else:
        return todoslist

@app.post("/make_a_todo",response_model=List[To_do])
def createtodo(todo:To_do_Base):
    newid=max(i.id for i in todoslist)+1
    newtodo=To_do(id=newid,task=todo.task,description=todo.description,priority=todo.priority,status=todo.status)
    todoslist.append(newtodo)
    return todoslist

@app.put("/change_todo/{todo_id}",response_model=List[To_do])
def update(todo_id:int,new_todo:To_do_update):
    for i in todoslist:
        if i.id==todo_id:
            if new_todo.task!=None:
                i.task=new_todo.task
            if new_todo.description!=None:
                i.description=new_todo.description
            if new_todo.priority!=None:
                i.priority=new_todo.priority
            if new_todo.status!=None:
                i.status=new_todo.status
            return todoslist
    raise HTTPException(status_code=404,detail="Task Not Found")
        
@app.delete("/del_todo",response_model=List[To_do])
def tododel(todo_ID:int=None):
    if todo_ID:
        for i in todoslist:
            if i.id==todo_ID:
                todoslist.remove(i)
                return todoslist
        raise HTTPException(status_code=404,detail="Task Not Found")
    else:
        todoslist.clear()
        return todoslist