from fastapi import FastAPI, Header, HTTPException
from pydantic import BaseModel


class Item(BaseModel):
    id: str
    title: str
    description: str | None = None


foo_item = Item(id="foo", title="Foo", description="There goes my hero")
bar_item = Item(id="bar", title="Bar", description="The bartenders")

fake_secret_token = "coneofsilence"

fake_db: dict[str, Item] = {
    "foo": foo_item,
    "bar": bar_item,
}

app = FastAPI()


@app.get("/items/{item_id}", response_model=Item)
async def read_main(item_id: str, x_token: str = Header()):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item_id not in fake_db:
        raise HTTPException(status_code=404, detail="Item not found")
    return fake_db[item_id]


@app.post("/items/", response_model=Item)
async def create_item(item: Item, x_token: str = Header()):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item.id in fake_db:
        raise HTTPException(status_code=409, detail="Item already exists")
    fake_db[item.id] = item
    return item