import 'package:flutter/material.dart';

import 'data_grid_action.dart';
import 'data_grid_column.dart';

/// Data loading mode for the grid.
sealed class DataGridDataMode {
  const DataGridDataMode._();

  /// Load all data at once.
  const factory DataGridDataMode.all() = AllDataMode;

  /// Paginated loading with page controls.
  const factory DataGridDataMode.paginated({int pageSize}) = PaginatedDataMode;

  /// Infinite scroll loading.
  const factory DataGridDataMode.infinite({
    int initialLoad,
    int loadMoreThreshold,
  }) = InfiniteDataMode;
}

/// Load all data mode.
final class AllDataMode extends DataGridDataMode {
  const AllDataMode() : super._();
}

/// Paginated data mode.
final class PaginatedDataMode extends DataGridDataMode {
  const PaginatedDataMode({this.pageSize = 25}) : super._();
  final int pageSize;
}

/// Infinite scroll data mode.
final class InfiniteDataMode extends DataGridDataMode {
  const InfiniteDataMode({
    this.initialLoad = 50,
    this.loadMoreThreshold = 10,
  }) : super._();

  final int initialLoad;
  final int loadMoreThreshold;
}

/// Main configuration for a DataGrid.
class DataGridConfig<T> {
  const DataGridConfig({
    required this.columns,
    this.actions = const [],
    this.bulkActions = const [],
    this.rowsSelectable = false,
    this.showHeader = true,
    this.showFooter = true,
    this.enableSearch = false,
    this.searchHint = 'Search...',
    this.defaultSortColumn,
    this.defaultSortDescending = false,
    this.emptyStateBuilder,
    this.loadingBuilder,
    this.errorBuilder,
    this.onRowTap,
    this.cellPadding = const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
    this.headerHeight = 48.0,
    this.rowHeight,
    this.dataMode = const DataGridDataMode.all(),
    this.rowColor,
    this.alternatingRowColors = false,
  });

  /// Column definitions.
  final List<DataGridColumn<T>> columns;

  /// Per-row actions (shown in actions menu).
  final List<DataGridAction<T>> actions;

  /// Bulk actions for selected rows.
  final List<DataGridBulkAction<T>> bulkActions;

  /// Whether rows can be selected.
  final bool rowsSelectable;

  /// Whether to show the header row.
  final bool showHeader;

  /// Whether to show the footer with count/pagination.
  final bool showFooter;

  /// Whether to show search bar.
  final bool enableSearch;

  /// Placeholder text for search input.
  final String searchHint;

  /// Index of column to sort by default.
  final int? defaultSortColumn;

  /// Whether default sort is descending.
  final bool defaultSortDescending;

  /// Custom empty state widget builder.
  final Widget Function(BuildContext context)? emptyStateBuilder;

  /// Custom loading widget builder.
  final Widget Function(BuildContext context)? loadingBuilder;

  /// Custom error widget builder.
  final Widget Function(BuildContext context, Object error, VoidCallback retry)?
      errorBuilder;

  /// Callback when a row is tapped.
  final void Function(T item)? onRowTap;

  /// Padding for each cell.
  final EdgeInsetsGeometry cellPadding;

  /// Height of the header row.
  final double headerHeight;

  /// Height of each data row. If null, rows size to content.
  final double? rowHeight;

  /// Data loading mode.
  final DataGridDataMode dataMode;

  /// Custom row background color builder.
  final Color? Function(BuildContext context, T item, int index)? rowColor;

  /// Whether to use alternating row colors.
  final bool alternatingRowColors;

  /// Gets visible columns only.
  List<DataGridColumn<T>> get visibleColumns =>
      columns.where((c) => c.visible).toList();

  /// Gets searchable column indices.
  List<int> get searchableColumnIndices => columns
      .asMap()
      .entries
      .where((e) => e.value.searchable)
      .map((e) => e.key)
      .toList();
}