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from fastapi import FastAPI
from pydantic import BaseModel
from typing import Optional

class CustomerCreate(BaseModel):
    name: str
    email: str
    age: int



class CustomerResponse(BaseModel):
    name: str
   
   

app = FastAPI()
tasks=[]

@app.get("/")
def read_root():
    return {"message": "Welcome to BookShelf"}

@app.get("/books")
def get_books():
    books = [
        {"title": "The Alchemist", "author": "Paulo Coelho"},
        {"title": "1984", "author": "George Orwell"},
    ]
    return books

@app.get("/books/{book_id}")
def get_book(book_id: int):
    books = [
        {"title": "The Alchemist", "author": "Paulo Coelho"},
        {"title": "1984", "author": "George Orwell"},
    ]
    return books[book_id]

@app.post("/tasks", status_code=201)
def create_task(task: dict):
    new_task = {
        "id": len(tasks) + 1,
        "title": task["title"],
        "done": False,
    }
    tasks.append(new_task)
    return tasks

@app.post("/customers",response_model=CustomerResponse)
def create_customer(customer: CustomerCreate):

    return {
        "name":customer.name,
        "age":customer.age,
        "email":customer.email
    }
















temp.py code
from pydantic import BaseModel,Field,field_validator
from typing import Optional

class CustomerCreate(BaseModel):

    name : str
    email: str
    age: Optional[int] = None

    @field_validator("email")
    @classmethod
    def email_not_contain(cls,value):
         
         if "@" not in value:
              raise ValueError("doesnt contain @")
         return value
    


c = CustomerCreate(name ="Alice",email="amangmail.com",age=21)

print(c)


class item(BaseModel):
     prouduct_name:str
     quantity:int
     price:float

class order(BaseModel):
     customer_name:str
     deleivery_addres:str