"use client";

import { useState } from "react";
import Link from "next/link";
import { useRouter } from "next/navigation";
import { useTranslations, useFormatter } from "next-intl";
import { Card } from "@/components/ui/card";
import type { InvoiceDraftRecord } from "@/types";

interface Props {
  drafts: InvoiceDraftRecord[];
  /** Map ZITADEL org id → company name for friendlier display. */
  orgNameMap: Record<string, string>;
}

/**
 * Renders the drafts table with per-row Edit / Delete actions.
 *
 * The total preview is the algebraic sum of line amounts (the same
 * formula billing.computeCustomInvoiceTotals uses for the subtotal,
 * minus VAT — which we don't know without the org's billing
 * snapshot). It's a hint, not authoritative; the real total
 * appears when the draft is issued.
 *
 * Empty state shows a clear CTA so a fresh admin knows where to
 * start.
 */
export function DraftList({ drafts, orgNameMap }: Props) {
  const t = useTranslations("adminBilling");
  const fmt = useFormatter();
  const router = useRouter();
  const [busyId, setBusyId] = useState<string | null>(null);

  const onDelete = async (id: string) => {
    if (!confirm(t("draftDeleteConfirm"))) return;
    setBusyId(id);
    try {
      const res = await fetch(`/api/admin/billing/invoice-drafts/${id}`, {
        method: "DELETE",
      });
      if (!res.ok) {
        const j = await res.json().catch(() => ({}));
        throw new Error(j.error || `HTTP ${res.status}`);
      }
      router.refresh();
    } catch (e: any) {
      alert(e.message);
    } finally {
      setBusyId(null);
    }
  };

  if (drafts.length === 0) {
    return (
      <Card>
        <div className="p-6 text-center">
          <p className="text-text-secondary mb-4">{t("draftsEmpty")}</p>
          <Link
            href="/admin/billing/invoices/new"
            className="inline-block px-4 py-2 rounded-md bg-accent text-white text-sm"
          >
            {t("newInvoiceBtn")}
          </Link>
        </div>
      </Card>
    );
  }

  return (
    <Card>
      <div className="flex justify-end p-3 border-b border-border">
        <Link
          href="/admin/billing/invoices/new"
          className="inline-block px-3 py-1.5 rounded-md bg-accent text-white text-sm"
        >
          {t("newInvoiceBtn")}
        </Link>
      </div>
      <table className="w-full text-sm">
        <thead className="text-xs text-text-muted text-left">
          <tr>
            <th className="pb-2 pl-3 pr-4">{t("draftOrgCol")}</th>
            <th className="pb-2 pr-4">{t("draftIssueDateCol")}</th>
            <th className="pb-2 pr-4 text-center">{t("draftLinesCol")}</th>
            <th className="pb-2 pr-4 text-right">{t("draftSubtotalCol")}</th>
            <th className="pb-2 pr-4">{t("draftUpdatedCol")}</th>
            <th className="pb-2 pr-3 text-right">{t("draftActionsCol")}</th>
          </tr>
        </thead>
        <tbody>
          {drafts.map((d) => {
            const subtotal = d.payload.lines.reduce(
              (s, ln) =>
                s +
                Math.round(ln.quantity * ln.unitPriceChf * 100) / 100,
              0
            );
            return (
              <tr key={d.id} className="border-t border-border">
                <td className="py-2 pl-3 pr-4">
                  <Link
                    href={`/admin/billing/invoice-drafts/${d.id}`}
                    className="hover:underline"
                  >
                    {orgNameMap[d.zitadelOrgId] ?? d.zitadelOrgId}
                  </Link>
                </td>
                <td className="py-2 pr-4 text-xs font-mono text-text-secondary whitespace-nowrap">
                  {d.payload.issueDate}
                </td>
                <td className="py-2 pr-4 text-center text-xs">
                  {d.payload.lines.length}
                </td>
                <td className="py-2 pr-4 text-right font-mono text-xs whitespace-nowrap">
                  CHF {subtotal.toFixed(2)}
                </td>
                <td className="py-2 pr-4 text-xs text-text-muted whitespace-nowrap">
                  {fmt.dateTime(new Date(d.updatedAt), {
                    dateStyle: "medium",
                    timeStyle: "short",
                  })}
                </td>
                <td className="py-2 pr-3 text-right">
                  <Link
                    href={`/admin/billing/invoice-drafts/${d.id}`}
                    className="text-accent hover:underline text-xs mr-3"
                  >
                    {t("editBtn")}
                  </Link>
                  <button
                    onClick={() => onDelete(d.id)}
                    disabled={busyId === d.id}
                    className="text-error hover:underline text-xs disabled:opacity-50"
                  >
                    {busyId === d.id ? t("deleting") : t("deleteBtn")}
                  </button>
                </td>
              </tr>
            );
          })}
        </tbody>
      </table>
    </Card>
  );
}