'use client';

import { useState, useMemo } from 'react';
import {
  ColumnDef,
  flexRender,
  getCoreRowModel,
  getFilteredRowModel,
  getPaginationRowModel,
  getSortedRowModel,
  useReactTable,
  ColumnFiltersState,
  SortingState,
  VisibilityState,
} from '@tanstack/react-table';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import {
  DropdownMenu,
  DropdownMenuCheckboxItem,
  DropdownMenuContent,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { ChevronDown, Download, MoreHorizontal } from 'lucide-react';
import { Pagination } from './pagination';

interface DataTableProps<TData, TValue> {
  columns: ColumnDef<TData, TValue>[];
  data: TData[];
  searchKey?: string;
  searchPlaceholder?: string;
  onExport?: () => void;
  pagination?: {
    currentPage: number;
    totalPages: number;
    totalCount: number;
    pageSize?: number;
    baseUrl: string;
    showPageSizeSelector?: boolean;
  };
}

export function DataTable<TData, TValue>({
  columns,
  data,
  searchKey,
  searchPlaceholder = "Search...",
  onExport,
  pagination,
}: DataTableProps<TData, TValue>) {
  const [sorting, setSorting] = useState<SortingState>([]);
  const [columnFilters, setColumnFilters] = useState<ColumnFiltersState>([]);
  const [columnVisibility, setColumnVisibility] = useState<VisibilityState>({});
  const [rowSelection, setRowSelection] = useState({});

  const processedColumns = useMemo(() => {
    return columns.map(col => ({
      ...col,
      cell: col.cell || (({ getValue }: { getValue: () => unknown }) => getValue())
    }))
  }, [columns]);

  const table = useReactTable({
    data,
    columns: processedColumns,
    onSortingChange: setSorting,
    onColumnFiltersChange: setColumnFilters,
    getCoreRowModel: getCoreRowModel(),
    getPaginationRowModel: getPaginationRowModel(),
    getSortedRowModel: getSortedRowModel(),
    getFilteredRowModel: getFilteredRowModel(),
    onColumnVisibilityChange: setColumnVisibility,
    onRowSelectionChange: setRowSelection,
    state: {
      sorting,
      columnFilters,
      columnVisibility,
      rowSelection,
    },
  });

  return (
    <div className="w-full">
      <div className="flex items-center py-4">
        {searchKey && (
          <Input
            placeholder={searchPlaceholder}
            value={(table.getColumn(searchKey)?.getFilterValue() as string) ?? ""}
            onChange={(event) =>
              table.getColumn(searchKey)?.setFilterValue(event.target.value)
            }
            className="max-w-sm"
          />
        )}
        <div className="ml-auto flex items-center space-x-2">
          {onExport && (
            <Button
              variant="outline"
              size="sm"
              onClick={onExport}
              className="ml-auto"
            >
              <Download className="mr-2 h-4 w-4" />
              Export
            </Button>
          )}
          <DropdownMenu>
            <DropdownMenuTrigger asChild>
              <Button variant="outline" className="ml-auto">
                Columns <ChevronDown className="ml-2 h-4 w-4" />
              </Button>
            </DropdownMenuTrigger>
            <DropdownMenuContent align="end">
              {table
                .getAllColumns()
                .filter((column) => column.getCanHide())
                .map((column) => {
                  return (
                    <DropdownMenuCheckboxItem
                      key={column.id}
                      className="capitalize"
                      checked={column.getIsVisible()}
                      onCheckedChange={(value) =>
                        column.toggleVisibility(!!value)
                      }
                    >
                      {column.id}
                    </DropdownMenuCheckboxItem>
                  );
                })}
            </DropdownMenuContent>
          </DropdownMenu>
        </div>
      </div>
      <div className="rounded-md border">
        <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"}
                >
                  {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"
                >
                  No results.
                </TableCell>
              </TableRow>
            )}
          </TableBody>
        </Table>
      </div>
      {pagination ? (
        <Pagination
          currentPage={pagination.currentPage}
          totalPages={pagination.totalPages}
          totalCount={pagination.totalCount}
          pageSize={pagination.pageSize}
          baseUrl={pagination.baseUrl}
          showPageSizeSelector={pagination.showPageSizeSelector}
        />
      ) : (
        <div className="flex items-center justify-end space-x-2 py-4">
          <div className="flex-1 text-sm text-muted-foreground">
            {table.getFilteredSelectedRowModel().rows.length} of{" "}
            {table.getFilteredRowModel().rows.length} row(s) selected.
          </div>
          <div className="space-x-2">
            <Button
              variant="outline"
              size="sm"
              onClick={() => table.previousPage()}
              disabled={!table.getCanPreviousPage()}
            >
              Previous
            </Button>
            <Button
              variant="outline"
              size="sm"
              onClick={() => table.nextPage()}
              disabled={!table.getCanNextPage()}
            >
              Next
            </Button>
          </div>
        </div>
      )}
    </div>
  );
}