reporting.py

from operations import load_data

def generate_report():
    data = load_data()
    total_customers = len(data)
    total_deposits = 0.0
    total_withdrawals = 0.0
    total_balance = 0.0
    top_accounts = []

    for acc, info in data.items():
        bal = float(info.get("balance",0))
        total_balance += bal
        deposits = sum(t.get("amount",0) for t in info.get("history",[]) if t.get("type")=="deposit")
        withdrawals = sum(t.get("amount",0) for t in info.get("history",[]) if t.get("type")=="withdrawal")
        total_deposits += deposits
        total_withdrawals += withdrawals
        top_accounts.append((acc, bal))

    top_accounts.sort(key=lambda x: x[1], reverse=True)
    avg_balance = total_balance / total_customers if total_customers else 0.0

    report_lines = []
    report_lines.append("===== TITAN ATM SYSTEM REPORT =====")
    report_lines.append(f"Total Customers: {total_customers}")
    report_lines.append(f"Total Deposited: ${total_deposits:.2f}")
    report_lines.append(f"Total Withdrawn: ${total_withdrawals:.2f}")
    report_lines.append(f"Total Balance in System: ${total_balance:.2f}")
    report_lines.append(f"Average Balance per Customer: ${avg_balance:.2f}")
    report_lines.append("\nTop 3 Accounts by Balance:")
    for acc, bal in top_accounts[:3]:
        report_lines.append(f"Account {acc}: ${bal:.2f}")
    report_lines.append("====================================")
    return "\n".join(report_lines)