import 'dart:math' as math;

import 'package:flutter/material.dart';

import '../theme/app_typography.dart';
import 'mono_text.dart';

class TasQColumn<T> {
  const TasQColumn({
    required this.header,
    required this.cellBuilder,
    this.technical = false,
  });

  final String header;
  final Widget Function(BuildContext context, T item) cellBuilder;
  final bool technical;
}

typedef TasQMobileTileBuilder<T> =
    Widget Function(BuildContext context, T item, List<Widget> actions);

typedef TasQRowActions<T> = List<Widget> Function(T item);

typedef TasQRowTap<T> = void Function(T item);

class TasQAdaptiveList<T> extends StatelessWidget {
  const TasQAdaptiveList({
    super.key,
    required this.items,
    required this.columns,
    required this.mobileTileBuilder,
    this.rowActions,
    this.onRowTap,
    this.rowsPerPage = 25,
    this.tableHeader,
    this.filterHeader,
    this.summaryDashboard,
  });

  final List<T> items;
  final List<TasQColumn<T>> columns;
  final TasQMobileTileBuilder<T> mobileTileBuilder;
  final TasQRowActions<T>? rowActions;
  final TasQRowTap<T>? onRowTap;
  final int rowsPerPage;
  final Widget? tableHeader;
  final Widget? filterHeader;
  final Widget? summaryDashboard;

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final isMobile = constraints.maxWidth < 600;
        final hasBoundedHeight = constraints.hasBoundedHeight;

        if (isMobile) {
          final listView = ListView.separated(
            padding: const EdgeInsets.only(bottom: 24),
            itemCount: items.length,
            separatorBuilder: (context, index) => const SizedBox(height: 12),
            itemBuilder: (context, index) {
              final item = items[index];
              final actions = rowActions?.call(item) ?? const <Widget>[];
              return mobileTileBuilder(context, item, actions);
            },
          );
          final shrinkWrappedList = ListView.separated(
            padding: const EdgeInsets.only(bottom: 24),
            itemCount: items.length,
            separatorBuilder: (context, index) => const SizedBox(height: 12),
            itemBuilder: (context, index) {
              final item = items[index];
              final actions = rowActions?.call(item) ?? const <Widget>[];
              return mobileTileBuilder(context, item, actions);
            },
            shrinkWrap: true,
            physics: const NeverScrollableScrollPhysics(),
          );
          final summarySection = summaryDashboard == null
              ? null
              : <Widget>[
                  SizedBox(width: double.infinity, child: summaryDashboard!),
                  const SizedBox(height: 12),
                ];
          final filterSection = filterHeader == null
              ? null
              : <Widget>[
                  ExpansionTile(
                    title: const Text('Filters'),
                    children: [
                      Padding(
                        padding: const EdgeInsets.only(bottom: 8),
                        child: filterHeader!,
                      ),
                    ],
                  ),
                  const SizedBox(height: 8),
                ];
          return Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                ...?summarySection,
                ...?filterSection,
                if (hasBoundedHeight) Expanded(child: listView),
                if (!hasBoundedHeight) shrinkWrappedList,
              ],
            ),
          );
        }

        final dataSource = _TasQTableSource<T>(
          context: context,
          items: items,
          columns: columns,
          rowActions: rowActions,
          onRowTap: onRowTap,
        );
        final contentWidth = constraints.maxWidth * 0.8;
        final tableWidth = math.max(
          contentWidth,
          (columns.length + (rowActions == null ? 0 : 1)) * 140.0,
        );
        final effectiveRowsPerPage = math.min(
          rowsPerPage,
          math.max(1, items.length),
        );
        final tableWidget = SingleChildScrollView(
          scrollDirection: Axis.horizontal,
          child: SizedBox(
            width: tableWidth,
            child: PaginatedDataTable(
              header: tableHeader,
              rowsPerPage: effectiveRowsPerPage,
              columnSpacing: 20,
              horizontalMargin: 16,
              showCheckboxColumn: false,
              headingRowColor: WidgetStateProperty.resolveWith(
                (states) => Theme.of(context).colorScheme.surfaceContainer,
              ),
              columns: [
                for (final column in columns)
                  DataColumn(label: Text(column.header)),
                if (rowActions != null)
                  const DataColumn(label: Text('Actions')),
              ],
              source: dataSource,
            ),
          ),
        );

        final summarySection = summaryDashboard == null
            ? null
            : <Widget>[
                SizedBox(width: contentWidth, child: summaryDashboard!),
                const SizedBox(height: 12),
              ];
        final filterSection = filterHeader == null
            ? null
            : <Widget>[filterHeader!, const SizedBox(height: 12)];

        return SingleChildScrollView(
          primary: hasBoundedHeight,
          child: Center(
            child: SizedBox(
              width: contentWidth,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [...?summarySection, ...?filterSection, tableWidget],
              ),
            ),
          ),
        );
      },
    );
  }
}

class _TasQTableSource<T> extends DataTableSource {
  _TasQTableSource({
    required this.context,
    required this.items,
    required this.columns,
    required this.rowActions,
    required this.onRowTap,
  });

  final BuildContext context;
  final List<T> items;
  final List<TasQColumn<T>> columns;
  final TasQRowActions<T>? rowActions;
  final TasQRowTap<T>? onRowTap;

  @override
  DataRow? getRow(int index) {
    if (index >= items.length) return null;
    final item = items[index];
    final cells = <DataCell>[];

    for (final column in columns) {
      final widget = column.cellBuilder(context, item);
      cells.add(DataCell(_applyTechnicalStyle(context, widget, column)));
    }

    if (rowActions != null) {
      final actions = rowActions!.call(item);
      cells.add(
        DataCell(Row(mainAxisSize: MainAxisSize.min, children: actions)),
      );
    }

    return DataRow(
      onSelectChanged: onRowTap == null ? null : (_) => onRowTap!(item),
      cells: cells,
    );
  }

  @override
  bool get isRowCountApproximate => false;

  @override
  int get rowCount => items.length;

  @override
  int get selectedRowCount => 0;
}

Widget _applyTechnicalStyle<T>(
  BuildContext context,
  Widget child,
  TasQColumn<T> column,
) {
  if (!column.technical) return child;
  if (child is Text && child.data != null) {
    return MonoText(
      child.data ?? '',
      style: child.style,
      maxLines: child.maxLines,
      overflow: child.overflow,
      textAlign: child.textAlign,
    );
  }

  final mono = AppMonoText.of(context).body;
  return DefaultTextStyle.merge(style: mono, child: child);
}