export.ts

import { FilteredPurchases, PurchaseWithLineItems } from "@/types/purchase";
import Papa from "papaparse";
import { DISASTER_TYPE_LABELS } from "@/types/disaster";
import { getAllPurchasesForExport } from "@/api/purchase";

const handleCSVCreation = (purchases: PurchaseWithLineItems[]) => {
    const data = purchases.flatMap((p) => {
        if (p.lineItems.length === 0) {
            return [
                {
                    Merchant: p.vendor || "Unknown Vendor",
                    "Purchase Amount": (p.totalAmountCents / 100).toFixed(2),
                    "Purchase Date": new Date(p.dateCreated).toLocaleDateString(),
                    "Line Item": "No line items",
                    "Line Item Amount": "N/A",
                    Category: "Undefined",
                    "Disaster Related": "Non-Disaster",
                },
            ];
        }

        return p.lineItems.map((li) => ({
            Merchant: p.vendor || "Unknown Vendor",
            "Purchase Amount": (p.totalAmountCents / 100).toFixed(2),
            "Purchase Date": new Date(p.dateCreated).toLocaleDateString(),
            "Line Item": li.description || "Unknown Item",
            "Line Item Amount": (li.amountCents / 100).toFixed(2),
            Category: li.category || "Undefined",
            "Disaster Related": DISASTER_TYPE_LABELS.get(li.type || "pending") ?? "Undefined",
        }));
    });

    const csv = Papa.unparse(data);

    const blob = new Blob([csv], { type: "text/csv;charset=utf-8;" });
    const link = document.createElement("a");
    link.href = URL.createObjectURL(blob);
    link.download = `business-transactions.csv`;
    link.click();
    URL.revokeObjectURL(link.href);
};

export const handleExportClick = async (
    setIsExporting: (bool: boolean) => void,
    filters: FilteredPurchases,
    total?: number
) => {
    if (total) {
        setIsExporting(true);
        const allPurchases = await getAllPurchasesForExport(filters, total);
        handleCSVCreation(allPurchases);
        setIsExporting(false);
    }
};