/**
 * PolicyTableV2
 * 
 * Main data table component for Policy Explorer V2.
 * Integrates TanStack Table with shadcn UI Table primitives.
 * 
 * Features:
 * - Server-side pagination via TanStack Table manual mode
 * - Column sorting with visual indicators
 * - Column resizing with drag handles
 * - Sticky header (CSS position: sticky)
 * - Row selection for CSV export
 * - Density modes (compact/comfortable)
 */

'use client';

import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import { flexRender } from '@tanstack/react-table';
import type { Table as TanStackTable } from '@tanstack/react-table';
import type { PolicySettingRow } from '@/lib/types/policy-table';
import { cn } from '@/lib/utils';

interface PolicyTableV2Props {
  table: TanStackTable<PolicySettingRow>;
  density: 'compact' | 'comfortable';
  isLoading?: boolean;
}

export function PolicyTableV2({ table, density, isLoading = false }: PolicyTableV2Props) {
  const rowHeight = density === 'compact' ? 'h-10' : 'h-14';

  return (
    <div className="relative rounded-md border">
      <div className="overflow-auto max-h-[calc(100vh-300px)]">
        <Table>
          <TableHeader className="sticky top-0 z-10 bg-background">
            {table.getHeaderGroups().map((headerGroup) => (
              <TableRow key={headerGroup.id}>
                {headerGroup.headers.map((header) => {
                  return (
                    <TableHead
                      key={header.id}
                      style={{
                        width: header.getSize() !== 150 ? header.getSize() : undefined,
                      }}
                      className="relative"
                    >
                      {header.isPlaceholder
                        ? null
                        : flexRender(
                            header.column.columnDef.header,
                            header.getContext()
                          )}
                      
                      {/* Column Resize Handle */}
                      {header.column.getCanResize() && (
                        <div
                          onMouseDown={header.getResizeHandler()}
                          onTouchStart={header.getResizeHandler()}
                          className={cn(
                            'absolute right-0 top-0 h-full w-1 cursor-col-resize select-none touch-none',
                            'hover:bg-primary',
                            header.column.getIsResizing() && 'bg-primary'
                          )}
                        />
                      )}
                    </TableHead>
                  );
                })}
              </TableRow>
            ))}
          </TableHeader>
          <TableBody>
            {isLoading ? (
              <TableRow>
                <TableCell
                  colSpan={table.getAllColumns().length}
                  className="h-24 text-center"
                >
                  Loading...
                </TableCell>
              </TableRow>
            ) : table.getRowModel().rows?.length ? (
              table.getRowModel().rows.map((row) => (
                <TableRow
                  key={row.id}
                  data-state={row.getIsSelected() && 'selected'}
                  className={cn(rowHeight)}
                >
                  {row.getVisibleCells().map((cell) => (
                    <TableCell
                      key={cell.id}
                      style={{
                        width: cell.column.getSize() !== 150 ? cell.column.getSize() : undefined,
                      }}
                    >
                      {flexRender(
                        cell.column.columnDef.cell,
                        cell.getContext()
                      )}
                    </TableCell>
                  ))}
                </TableRow>
              ))
            ) : (
              <TableRow>
                <TableCell
                  colSpan={table.getAllColumns().length}
                  className="h-24 text-center"
                >
                  No results found.
                </TableCell>
              </TableRow>
            )}
          </TableBody>
        </Table>
      </div>
    </div>
  );
}