app.py

from pydantic import BaseModel
from fastapi import FastAPI, HTTPException
from typing import Optional
import uvicorn

app= FastAPI()
# 1. Define the blueprint for APIs
class Customer(BaseModel):
    id:int
    name: str
    email: str
    phone: Optional[str] = None
    address: Optional[str] = None
    
# Initialize customer list
customer_list = []

# 2. Create the api endpoint
#Create 
@app.post("/customers", response_model=Customer)
def create_customer(customer:Customer):
    customer_list.append(customer)
    return customer
    
#Read
@app.get("/customers", response_model= list[Customer])
def get_customers():
    return customer_list

#Update
@app.put("/customers/{id}", response_model=Customer)
def update_customer(id: int, customer: Customer):
    for i, existing_customer in enumerate(customer_list):
        if existing_customer.id == id:
            customer_list[i] = customer
            return customer
    raise HTTPException (status_code=404, detail ="Customer not found")

#Delete 
@app.delete("/customers/{id}", response_model=Customer)
def delete_customer(id: int):
    for i, customer in enumerate(customer_list):
        if customer.id == id:
            removed_customer = customer_list.pop(i)
            return removed_customer
    raise HTTPException(status_code=404, detail="Customer not found")

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=7860)