main.py

"""
Learn FastAPI
Simple FastAPI tutorial with CRUD operations
"""

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


app = FastAPI(title="Learn FastAPI", version="1.0.0")


# Data model
class Item(BaseModel):
    id: Optional[int] = None
    name: str
    description: Optional[str] = None
    price: float


# In-memory database
items_db = []
next_id = 1


@app.get("/")
def read_root():
    """Root endpoint"""
    return {"message": "Welcome to FastAPI Tutorial!"}


@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 item by ID"""
    for item in items_db:
        if item.id == item_id:
            return item
    raise HTTPException(status_code=404, detail="Item not found")


@app.post("/items", response_model=Item)
def create_item(item: Item):
    """Create new item"""
    global next_id
    item.id = next_id
    next_id += 1
    items_db.append(item)
    return item


@app.put("/items/{item_id}", response_model=Item)
def update_item(item_id: int, updated_item: Item):
    """Update item"""
    for i, item in enumerate(items_db):
        if item.id == item_id:
            updated_item.id = item_id
            items_db[i] = updated_item
            return updated_item
    raise HTTPException(status_code=404, detail="Item not found")


@app.delete("/items/{item_id}")
def delete_item(item_id: int):
    """Delete item"""
    for i, item in enumerate(items_db):
        if item.id == item_id:
            items_db.pop(i)
            return {"message": "Item deleted"}
    raise HTTPException(status_code=404, detail="Item not found")


if __name__ == "__main__":
    import uvicorn
    print("\n" + "="*60)
    print("           FASTAPI TUTORIAL")
    print("="*60)
    print("\nStarting server...")
    print("API docs: http://127.0.0.1:8000/docs")
    print("="*60 + "\n")
    
    uvicorn.run(app, host="127.0.0.1", port=8000)