import json
import random
from datetime import datetime
from pathlib import Path
from typing import Dict

DATA_DIR = Path(__file__).resolve().parent.parent / "data"


def _load_json(filename: str) -> Dict:
    path = DATA_DIR / filename
    with open(path, encoding="utf-8") as file:
        return json.load(file)


PRICE_RANGES = _load_json("price_ranges.json")["items"]


def random_price(item: str) -> Dict:
    low, high = PRICE_RANGES.get(item, (1.0, 3.0))
    price = min(round(random.uniform(low, high), 2), 3.0)
    return {
        "item": item,
        "price": price,
        "currency": "EUR",
        "generated_at": datetime.now().isoformat(timespec="seconds"),
    }


def prices_payload() -> Dict:
    return {
        "items": [random_price(item) for item in PRICE_RANGES.keys()],
        "disclaimer": "Depende de como pilles al de cafete.",
    }