dev: to check working

app.py

@@ -1,11 +1,60 @@
-from fastapi import FastAPI
+
 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": "Hello, FastAPI!"}
+    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)