import uvicorn

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List

app = FastAPI()

class Item(BaseModel):
    id: int
    name: str
    description: str
    price: float
    quantity: int

items_db: List[Item] = [
    Item(id=1, name="Laptop", description="A powerful laptop", price=1200.50, quantity=10),
    Item(id=2, name="Smartphone", description="A high-end smartphone", price=800.00, quantity=20),
    Item(id=3, name="Headphones", description="Noise-canceling headphones", price=150.00, quantity=50),
]

@app.get("/")
def read_root():
    return {"message": "Welcome to the FastAPI application!"}

@app.get("/items/", response_model=List[Item])
def get_items():
    """
    Get all items.
    """
    return items_db

@app.get("/items/{item_id}", response_model=Item)
def get_item(item_id: int):
    """
    Get an item by its ID.
    """
    item = next((item for item in items_db if item.id == item_id), None)
    if not item:
        raise HTTPException(status_code=404, detail="Item not found")
    return item

@app.post("/items/", response_model=Item)
def create_item(item: Item):
    """
    Add a new item.
    """
    if any(existing_item.id == item.id for existing_item in items_db):
        raise HTTPException(status_code=400, detail="Item with this ID already exists")
    items_db.append(item)
    return item

@app.get("/health")
def health_check():
    return {"status": "OK"}


if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=1200)