import sys, os, json
from collections import defaultdict

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from kafka import KafkaConsumer
from shared.events import BOOTSTRAP_SERVERS, TOPIC_ORDERS, TOPIC_PAYMENTS, TOPIC_NOTIFICATIONS

TOPIC_ORDERS_DLQ = "orders_dlq"

stats = defaultdict(int)

def run():
    consumer = KafkaConsumer(
        TOPIC_ORDERS,
        TOPIC_ORDERS_DLQ,
        TOPIC_PAYMENTS,
        bootstrap_servers=BOOTSTRAP_SERVERS,
        group_id="analytics_service",
        auto_offset_reset="earliest",
        value_deserializer=lambda v: json.loads(v.decode("utf-8"))
    )

    print("[ANALYTICS SERVICE] Service d'analyse démarré, en attente d'évènements...")

    for message in consumer:
        event = message.value
        event_type = event["type"]
        payload = event["payload"]

        stats[event_type] += 1

        if event_type == "order_created":
            order_id = payload["order_id"]
            total = payload["total_amount"]
            print(f"[ANALYTICS SERVICE] Nouvelle commande {order_id} - total {total}€ "
                  f"| commandes reçues : {stats['order_created']}")

        elif event_type == "payment.confirmed":
            stats["revenue"] = stats.get("revenue", 0) + payload["amount"]
            print(f"[ANALYTICS SERVICE] Paiement confirmé - commande {payload['order_id']}, "
                  f"{payload['amount']}€ | CA total : {stats['revenue']}€")

        elif event_type == "payment.failed":
            print(f"[ANALYTICS SERVICE] Paiement échoué - commande {payload['order_id']} "
                  f"| échecs : {stats['payment.failed']}")

        elif event_type == "order.preparation_started":
            print(f"[ANALYTICS SERVICE] Préparation démarrée - commande {payload['order_id']} "
                  f"| en préparation : {stats['order.preparation_started']}")

if __name__ == "__main__":
    run()