"use client"

import React, { memo } from "react"
import {
  ColumnDef,
  flexRender,
  getCoreRowModel,
  useReactTable,
} from "@tanstack/react-table"

import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table"

interface DataTableProps<TData, TValue> {
  columns: ColumnDef<TData, TValue>[]
  data: TData[]
  onRowClick?: (row: TData) => void
  emptyState?: React.ReactNode
}

function DataTableInner<TData, TValue>({
  columns,
  data,
  onRowClick,
  emptyState,
}: DataTableProps<TData, TValue>) {
  const table = useReactTable({
    data,
    columns,
    getCoreRowModel: getCoreRowModel(),
  })

  return (
    <div className="rounded-xl border border-border-light dark:border-border-dark bg-card-light dark:bg-card-dark shadow-sm overflow-hidden">
      <div className="overflow-x-auto">
      <Table>
        <TableHeader>
          {table.getHeaderGroups().map((headerGroup) => (
            <TableRow key={headerGroup.id}>
              {headerGroup.headers.map((header) => {
                return (
                  <TableHead key={header.id}>
                    {header.isPlaceholder
                      ? null
                      : flexRender(
                          header.column.columnDef.header,
                          header.getContext()
                        )}
                  </TableHead>
                )
              })}
            </TableRow>
          ))}
        </TableHeader>
        <TableBody>
          {table.getRowModel().rows?.length ? (
            table.getRowModel().rows.map((row) => (
              
              <TableRow
                key={row.id}
                data-state={row.getIsSelected() && "selected"}
                onClick={() => onRowClick?.(row.original)}
                className={onRowClick ? "cursor-pointer hover:bg-muted/50 transition-colors" : ""}
              >
                {row.getVisibleCells().map((cell) => (
                  <TableCell key={cell.id}>
                    {flexRender(cell.column.columnDef.cell, cell.getContext())}
                  </TableCell>
                ))}
              </TableRow>
            ))
          ) : (
            <TableRow>
              <TableCell colSpan={columns.length} className="h-24 text-center p-0">
                {emptyState || (
                  <div className="py-12 text-muted-foreground font-medium">No results found.</div>
                )}
              </TableCell>
            </TableRow>
          )}
        </TableBody>
      </Table>
      </div>
    </div>
  )
}

/**
 * ⚡ Optimization: Memoized DataTable
 * Prevents redundant re-renders of the entire table when props (data, columns, onRowClick)
 * are referentially stable. This is critical for dashboard performance where parent
 * components often re-render due to side-panel state changes.
 */
export const DataTable = memo(DataTableInner) as <TData, TValue>(
  props: DataTableProps<TData, TValue>
) => React.ReactElement;