import { useState } from "react";
import { useAuditLog, type AuditLogRow } from "~/requestHandler/use-admin-hooks";
import {
  AdminTable,
  AdminPagination,
  AdminToolbar,
  AdminSearch,
  AdminSelect,
  AdminPageTitle,
  StatusBadge,
  faDate,
  useDebouncedValue,
  type Column,
} from "~/components/admin/DataTable";

const PAGE_SIZE = 25;

const ACTION: Record<string, { label: string; tone: "green" | "blue" | "red" | "gray" }> = {
  "seller.update": { label: "ویرایش فروشنده", tone: "blue" },
  "user.update": { label: "ویرایش کاربر", tone: "blue" },
  "product.update": { label: "ویرایش محصول", tone: "blue" },
  "payout.complete": { label: "تکمیل تسویه", tone: "green" },
  "payout.reject": { label: "رد تسویه", tone: "red" },
  "ledger.backfill": { label: "بازسازی دفتر", tone: "gray" },
};

const TARGET_LABEL: Record<string, string> = {
  seller: "فروشنده",
  user: "کاربر",
  product: "محصول",
  payout: "تسویه",
  ledger: "دفتر مالی",
};

/** Compact before→after diff of the touched fields. */
function Changes({ before, after }: Pick<AuditLogRow, "before" | "after">) {
  const keys = Array.from(
    new Set([...Object.keys(before || {}), ...Object.keys(after || {})])
  );
  const changed = keys.filter(
    (k) => JSON.stringify(before?.[k]) !== JSON.stringify(after?.[k])
  );
  if (changed.length === 0)
    return <span className="text-GRAY">—</span>;
  return (
    <div className="flex flex-col gap-0.5" dir="ltr">
      {changed.map((k) => (
        <span key={k} className="text-[11px] tabular-nums whitespace-nowrap">
          <span className="text-GRAY">{k}: </span>
          <span className="text-RED">{fmt(before?.[k])}</span>
          <span className="text-GRAY"> → </span>
          <span className="text-GREEN">{fmt(after?.[k])}</span>
        </span>
      ))}
    </div>
  );
}

function fmt(v: unknown) {
  if (v === null || v === undefined) return "∅";
  if (typeof v === "boolean") return v ? "true" : "false";
  return String(v);
}

export default function AdminAudit() {
  const [page, setPage] = useState(1);
  const [search, setSearch] = useState("");
  const [action, setAction] = useState("");
  const [targetType, setTargetType] = useState("");
  const debouncedSearch = useDebouncedValue(search);

  const { data, isLoading } = useAuditLog({
    page,
    page_size: PAGE_SIZE,
    search: debouncedSearch,
    action,
    target_type: targetType,
  });

  const reset = (fn: () => void) => {
    fn();
    setPage(1);
  };

  const columns: Column<AuditLogRow>[] = [
    {
      header: "عملیات",
      render: (r) => {
        const a = ACTION[r.action] || { label: r.action, tone: "gray" as const };
        return <StatusBadge label={a.label} tone={a.tone} />;
      },
    },
    {
      header: "هدف",
      render: (r) => (
        <span className="text-[12px] whitespace-nowrap">
          {TARGET_LABEL[r.targetType] || r.targetType}
          {r.targetId && (
            <span className="text-GRAY tabular-nums"> · {r.targetId.slice(0, 8)}</span>
          )}
        </span>
      ),
    },
    {
      header: "تغییرات",
      render: (r) => <Changes before={r.before} after={r.after} />,
    },
    {
      header: "مدیر",
      render: (r) => (
        <span className="text-GRAY text-[11px] tabular-nums" dir="ltr">
          {r.actorPhone || "سیستم"}
        </span>
      ),
    },
    {
      header: "تاریخ",
      render: (r) => <span className="text-GRAY whitespace-nowrap">{faDate(r.createdAt)}</span>,
    },
  ];

  return (
    <div>
      <AdminPageTitle>گزارش فعالیت مدیران</AdminPageTitle>
      <AdminToolbar>
        <AdminSearch
          value={search}
          onChange={(v) => reset(() => setSearch(v))}
          placeholder="جستجوی تلفن مدیر / شناسه هدف…"
        />
        <AdminSelect
          value={action}
          onChange={(v) => reset(() => setAction(v))}
          options={[
            { value: "", label: "همه عملیات‌ها" },
            { value: "seller.update", label: "ویرایش فروشنده" },
            { value: "user.update", label: "ویرایش کاربر" },
            { value: "product.update", label: "ویرایش محصول" },
            { value: "payout.complete", label: "تکمیل تسویه" },
            { value: "payout.reject", label: "رد تسویه" },
            { value: "ledger.backfill", label: "بازسازی دفتر" },
          ]}
        />
        <AdminSelect
          value={targetType}
          onChange={(v) => reset(() => setTargetType(v))}
          options={[
            { value: "", label: "همه هدف‌ها" },
            { value: "seller", label: "فروشنده" },
            { value: "user", label: "کاربر" },
            { value: "product", label: "محصول" },
            { value: "payout", label: "تسویه" },
          ]}
        />
      </AdminToolbar>
      <AdminTable
        columns={columns}
        rows={data?.results || []}
        isLoading={isLoading}
        getRowKey={(r) => r.id}
        emptyText="فعالیتی ثبت نشده است"
      />
      <AdminPagination page={page} pageSize={PAGE_SIZE} count={data?.count || 0} onPageChange={setPage} />
    </div>
  );
}