import { useTranslations, useFormatter } from "next-intl";
import { Link } from "@/i18n/navigation";
import { Card } from "@/components/ui/card";
import type { Invoice } from "@/types";

interface Props {
  invoices: Invoice[];
}

const statusColors: Record<string, string> = {
  open: "text-text-secondary bg-surface-3",
  paid: "text-success bg-success/10",
  overdue: "text-error bg-error/10",
  void: "text-text-muted bg-surface-3 line-through",
  // Phase 7: refund states. Red tinting matches the credit-note
  // PDF accent so customers reading the table get a visual cue
  // that something was credited back. partially_refunded reads
  // as a partial state (mixed colour), fully_refunded reads as
  // closed (line-through like void).
  partially_refunded: "text-error bg-error/10",
  fully_refunded: "text-text-muted bg-error/10 line-through",
};

/**
 * Customer's invoice history table. Server component — gets a
 * pre-fetched Invoice[] from /billing/page.tsx. Each row links
 * to /billing/<invoice-number> for the full detail view.
 *
 * Columns: number, period, due date, total, status. Status is
 * displayed with a colored badge so the customer can scan for
 * outstanding ones at a glance.
 */
export function CustomerInvoiceList({ invoices }: Props) {
  const t = useTranslations("customerBilling");
  const fmt = useFormatter();

  if (invoices.length === 0) {
    return (
      <Card>
        <p className="text-sm text-text-muted italic text-center py-8">
          {t("emptyHistory")}
        </p>
      </Card>
    );
  }

  return (
    <Card>
      <div className="overflow-x-auto">
      <table className="w-full text-sm">
        <thead className="text-xs text-text-muted text-left">
          <tr>
            <th className="pb-2">{t("numberCol")}</th>
            <th className="pb-2">{t("periodCol")}</th>
            <th className="pb-2">{t("dueCol")}</th>
            <th className="pb-2 text-right">{t("totalCol")}</th>
            <th className="pb-2 text-right">{t("statusCol")}</th>
          </tr>
        </thead>
        <tbody>
          {invoices.map((inv) => (
            <tr
              key={inv.id}
              className="border-t border-border hover:bg-surface-2 transition-colors"
            >
              <td className="py-2">
                <Link
                  href={`/billing/${inv.invoiceNumber}`}
                  className="font-mono text-xs text-accent hover:underline"
                >
                  {inv.invoiceNumber}
                </Link>
              </td>
              <td className="py-2 text-xs text-text-secondary">
                {inv.periodStart && inv.periodEnd ? (
                  <>
                    {fmt.dateTime(new Date(inv.periodStart), {
                      dateStyle: "medium",
                    })}
                    <span className="text-text-muted mx-1">→</span>
                    {fmt.dateTime(new Date(inv.periodEnd), {
                      dateStyle: "medium",
                    })}
                  </>
                ) : (
                  <span className="text-text-muted">—</span>
                )}
              </td>
              <td className="py-2 text-xs text-text-secondary">
                {fmt.dateTime(new Date(inv.dueAt), { dateStyle: "medium" })}
              </td>
              <td className="py-2 text-right font-mono">
                CHF {inv.totalChf.toFixed(2)}
              </td>
              <td className="py-2 text-right">
                <span
                  className={`text-[10px] uppercase tracking-wider px-2 py-1 rounded-md font-semibold ${
                    statusColors[inv.status] ?? "text-text-muted bg-surface-3"
                  }`}
                >
                  {t(`status.${inv.status}` as any)}
                </span>
              </td>
            </tr>
          ))}
        </tbody>
      </table>
      </div>
    </Card>
  );
}