from typing import List, Dict, Any
import csv
import io


def export_customers_csv(customers: List[Dict[str, Any]]) -> bytes:
    output = io.StringIO()
    writer = csv.writer(output)
    writer.writerow(["Name", "Company", "Country", "Phone", "Email", "Status", "Last Contact"])
    for c in customers:
        writer.writerow([
            c.get("name", ""),
            c.get("company", ""),
            c.get("country", ""),
            c.get("phone", ""),
            c.get("email", ""),
            c.get("status", ""),
            c.get("last_contact_at", ""),
        ])
    return output.getvalue().encode("utf-8-sig")


def export_quotations_csv(quotations: List[Dict[str, Any]]) -> bytes:
    output = io.StringIO()
    writer = csv.writer(output)
    writer.writerow(["Title", "Customer", "Currency", "Subtotal", "Total", "Status", "Date"])
    for q in quotations:
        writer.writerow([
            q.get("title", ""),
            q.get("customer_name", ""),
            q.get("currency", "USD"),
            q.get("subtotal", 0),
            q.get("total", 0),
            q.get("status", ""),
            q.get("created_at", ""),
        ])
    return output.getvalue().encode("utf-8-sig")