tatlock-ui/lib/shared/components/data_grid/widgets/data_grid_footer.dart

import 'package:flutter/material.dart';

import '../data_grid_config.dart';

/// Footer for DataGrid with item count and pagination controls.
class DataGridFooter extends StatelessWidget {
  const DataGridFooter({
    super.key,
    required this.totalCount,
    required this.displayedCount,
    required this.dataMode,
    this.currentPage = 0,
    this.onPageChange,
    this.isLoading = false,
  });

  final int totalCount;
  final int displayedCount;
  final DataGridDataMode dataMode;
  final int currentPage;
  final void Function(int page)? onPageChange;
  final bool isLoading;

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      decoration: BoxDecoration(
        color: colorScheme.surfaceContainerHighest,
        border: Border(
          top: BorderSide(color: colorScheme.outlineVariant),
        ),
      ),
      child: Row(
        children: [
          Text(
            _getCountText(),
            style: Theme.of(context).textTheme.bodySmall?.copyWith(
                  color: colorScheme.onSurfaceVariant,
                ),
          ),
          const Spacer(),
          if (dataMode is PaginatedDataMode) _buildPaginationControls(context),
        ],
      ),
    );
  }

  String _getCountText() {
    return switch (dataMode) {
      AllDataMode() => '$totalCount items',
      PaginatedDataMode(:final pageSize) => _getPaginatedCountText(pageSize),
      InfiniteDataMode() => '$displayedCount of $totalCount items',
    };
  }

  String _getPaginatedCountText(int pageSize) {
    final start = currentPage * pageSize + 1;
    final end = (start + displayedCount - 1).clamp(start, totalCount);
    return '$start-$end of $totalCount items';
  }

  Widget _buildPaginationControls(BuildContext context) {
    final mode = dataMode as PaginatedDataMode;
    final totalPages = (totalCount / mode.pageSize).ceil();
    final canGoPrevious = currentPage > 0;
    final canGoNext = currentPage < totalPages - 1;

    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        IconButton(
          icon: const Icon(Icons.first_page),
          onPressed: canGoPrevious ? () => onPageChange?.call(0) : null,
          tooltip: 'First page',
          iconSize: 20,
        ),
        IconButton(
          icon: const Icon(Icons.chevron_left),
          onPressed:
              canGoPrevious ? () => onPageChange?.call(currentPage - 1) : null,
          tooltip: 'Previous page',
          iconSize: 20,
        ),
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 8),
          child: Text(
            'Page ${currentPage + 1} of $totalPages',
            style: Theme.of(context).textTheme.bodySmall,
          ),
        ),
        IconButton(
          icon: const Icon(Icons.chevron_right),
          onPressed:
              canGoNext ? () => onPageChange?.call(currentPage + 1) : null,
          tooltip: 'Next page',
          iconSize: 20,
        ),
        IconButton(
          icon: const Icon(Icons.last_page),
          onPressed:
              canGoNext ? () => onPageChange?.call(totalPages - 1) : null,
          tooltip: 'Last page',
          iconSize: 20,
        ),
      ],
    );
  }
}