from typing import Optional

from fastapi import FastAPI
from pydantic import BaseModel, Field

app = FastAPI()


class Item(BaseModel):
    id: Optional[int] = None
    name: str = Field(description="The name of the item", regex="^[a-zA-Z0-9]*$")
    price: float
    is_offer: Optional[bool] = None


db = {
    1: Item(id=1, name="Foo", price=19.99),
    2: Item(id=2, name="Bar", price=29.99),
    3: Item(id=3, name="Baz", price=39.99),
}


@app.get("/")
def get_items(
    limit: int = 10,
    offset: int = Field(0, description="db offset"),
    q: Optional[str] = None,
):
    print(limit, offset, q)
    return [
        {"item": db[k], "price": db[k].price}
        for k in sorted(db.keys())[offset : offset + limit]
    ]


@app.get("/items/{item_id}")
def read_item(item_id: int):
    return db[item_id]


@app.post("/items")
def create_item(item: Item) -> Item:
    pid = list(db.keys())[-1] + 1
    item.id = pid
    db[pid] = item
    return item