"""Exemple d'utilisation des dumps."""

import json
from collections import Counter


def parse(filename):
    with open(filename, "r") as file:
        return json.load(file)


if __name__ == "__main__":
    Articles = {a["id"]: a for a in parse("article.dump.json")}
    Operations = parse("operation.dump.json")

    # Dépenses faites en K-Fêt depuis K-Psul
    total_expenses = -sum((float(op["amount"]) for op in Operations))
    print(f"total expenses: {total_expenses:.2f}€")

    # Montant moyen d'une transaction
    nb_ops = len(Operations)
    print(f"Average transaction amount: {total_expenses / nb_ops:.2f}€")

    # Nombre de ventes par article
    articles_sales = Counter()
    for operation in Operations:
        articles_sales[operation["article"]] += operation["number"]
    print("Most sold articles:")
    for id, nb in articles_sales.most_common(3):
        article_name = Articles[id]["name"]
        print(f"  - {article_name} : {nb}")