Retail Microservices Architecture and Prototype

# Orchestrator Service
# Main system that integrates cart, inventory, and payment

from flask import Flask, jsonify, request
import requests
app = Flask(__name__)

INVENTORY_URL = "http://localhost:5001"
CART_URL = "http://localhost:5002"
PAYMENT_URL = "http://localhost:5003"


@app.route("/checkout", methods=["POST"])
def checkout():
    data = request.get_json()
    item = data.get("item")
    quantity = data.get("quantity", 0)
    method = data.get("method", "credit_card")
    amount = data.get("amount", 0)

    inventory_response = requests.get(f"{INVENTORY_URL}/inventory/{item}")
    stock = inventory_response.json().get("stock", 0)

    if stock >= quantity:
        requests.post(f"{CART_URL}/cart/add", json={"item": item, "quantity": quantity})
        requests.post(f"{INVENTORY_URL}/inventory/{item}/reduce", json={"quantity": quantity})
        payment_response = requests.post(f"{PAYMENT_URL}/payment", json={"method": method, "amount": amount})
        return jsonify(payment_response.json())

    return jsonify({"message": f"Not enough stock for {item}."}), 400


if __name__ == "__main__":
    app.run(port=5000)