import 'package:flutter/material.dart';
import 'package:vitalapp/components/scroll_list.dart';

import 'table_column.dart';

const _cellPadding = EdgeInsets.symmetric(
  horizontal: 14,
  vertical: 12,
);

const _cellTextStyle = TextStyle(fontSize: 14);

const _headerBgColor = Color.fromRGBO(233, 237, 240, 1);

/// 数据列表
class VitalTable<T> extends StatefulWidget {
  VitalTable({
    Key? key,
    required this.columns,
    required this.source,
    this.loading = false,
    this.autoHeight = true,
    this.showSelect = false,
    this.selecteds,
    this.onAllRowsSelected,
    this.onRowSelected,
    this.onRowTap,
    this.headerDecoration,
    this.rowDecoration,
    this.selectedDecoration,
    this.headerTextStyle,
    this.rowTextStyle,
    this.selectedTextStyle,
    this.noDataHintText,
    this.currectSelected,
    this.checkCellWidth = 90,
    this.cellPadding = _cellPadding,
  })  : assert(() {
          if (showSelect == true && selecteds == null) {
            throw FlutterError(
                "Property `selecteds` must not be null while `selecteds` is not null.");
          }
          return true;
        }()),
        super(key: key);

  final double checkCellWidth;

  final EdgeInsets? cellPadding;

  ///无数据提示
  final String? noDataHintText;

  /// 列配置集合
  final List<TableColumn<T>> columns;

  /// 数据源
  final List<T>? source;

  /// 加载中
  final bool loading;

  /// 自适应高度
  final bool autoHeight;

  /// 是否显示选择列
  final bool showSelect;

  /// 已选中行索引
  final List<int>? selecteds;

  /// 全部勾选事件
  ///
  /// [value] 选中/取消选中
  ///
  /// [selectedIndexs] 当前已选所有索引
  final void Function(bool value, List<int> selectedIndexs)? onAllRowsSelected;

  /// 列勾选事件
  ///
  /// [value] 选中/取消选中
  ///
  /// [index] 当前勾选行
  ///
  /// [selectedIndexs] 当前已选所有索引
  final void Function(bool value, int index, List<int> selectedIndexs)?
      onRowSelected;

  /// 行点击事件
  ///
  /// [value] 选中/取消选中
  ///
  /// [index] 当前选中行
  ///
  /// [selectedIndexs] 当前已选所有索引
  final void Function(int index)? onRowTap;

  /// 表头装饰器
  final BoxDecoration? headerDecoration;

  /// 行装饰器
  final BoxDecoration? rowDecoration;

  /// 选中行装饰器
  final BoxDecoration? selectedDecoration;

  /// 表头文本样式
  final TextStyle? headerTextStyle;

  /// 行文本样式
  final TextStyle? rowTextStyle;

  /// 选中行文本样式
  final TextStyle? selectedTextStyle;

  /// 当前选中的
  int? currectSelected = -1;

  @override
  State<StatefulWidget> createState() => _VitalTableState<T>();
}

class _VitalTableState<T> extends State<VitalTable<T>> {
  final ScrollController _scrollController = ScrollController();
  List<int> _selectedIdxs = [];
  List<T> _source = [];
  late int _currectSelected = widget.currectSelected ?? -1;

  @override
  void didUpdateWidget(VitalTable<T> oldWidget) {
    _loadData();
    if (widget.currectSelected != oldWidget.currectSelected) {
      _currectSelected = widget.currectSelected ?? -1;
      setState(() {});
    }
    super.didUpdateWidget(oldWidget);
  }

  @override
  void initState() {
    _loadData();
    super.initState();
  }

  void _loadData() {
    _selectedIdxs = [if (widget.selecteds != null) ...widget.selecteds!];
    _source = widget.source ?? [];
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.start,
      children: [
        // header
        if (widget.columns.isNotEmpty) buildHeader(),

        // loading
        if (widget.loading)
          const SizedBox(
            height: 5,
            child: LinearProgressIndicator(),
          ),

        // rows
        if (widget.autoHeight)
          Column(children: createRows())
        else
          Expanded(
            child: AlwaysScrollListView(
              scrollController: _scrollController,
              child: ListView(
                padding: const EdgeInsets.only(right: 10),
                controller: _scrollController,
                children: createRows(),
              ),
            ),
          ),
        const SizedBox(height: 20),
      ],
    );
  }

  static Alignment headerAlignSwitch(TextAlign? textAlign) {
    switch (textAlign) {
      case TextAlign.center:
        return Alignment.center;
      case TextAlign.left:
        return Alignment.centerLeft;
      case TextAlign.right:
        return Alignment.centerRight;
      default:
        return Alignment.center;
    }
  }

  Widget buildHeader() {
    final decoration = widget.headerDecoration ??
        const BoxDecoration(
          color: _headerBgColor,
          // border: Border(
          //   bottom: BorderSide(color: Colors.grey.shade300, width: 1),
          // ),
        );
    final cells = <Widget>[];
    if (widget.showSelect) {
      final checked = _selectedIdxs.isNotEmpty &&
          _source.isNotEmpty &&
          _selectedIdxs.length == _source.length;
      cells.add(
        buildCheckCell(
          value: checked,
          onChanged: (value) {
            final checked = value == true;
            setState(() {
              _selectedIdxs = checked
                  ? List.generate(_source.length, (index) => index)
                  : [];
            });
            widget.onAllRowsSelected?.call(checked, _selectedIdxs);
          },
        ),
      );
    }
    cells.addAll(
      widget.columns.map(
        (column) {
          final child = column.headerRender != null
              ? column.headerRender!()
              : Container(
                  padding: widget.cellPadding,
                  alignment: headerAlignSwitch(column.textAlign),
                  child: Wrap(
                    crossAxisAlignment: WrapCrossAlignment.center,
                    children: [
                      Text(
                        column.headerText!,
                        textAlign: column.textAlign,
                        style: widget.headerTextStyle ??
                            const TextStyle(
                              fontSize: 14,
                              fontWeight: FontWeight.bold,
                            ),
                      )
                    ],
                  ),
                );
          final cell = buildCellBox(column, child);
          return Expanded(flex: column.actualFlex, child: cell);
        },
      ),
    );
    return Container(
      decoration: decoration,
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: cells,
      ),
    );
  }

  List<Widget> createRows() {
    if (_source.isEmpty) {
      if (widget.loading) return const [];
      var noDataHintText = widget.noDataHintText;
      return [
        Container(
          height: 50,
          alignment: Alignment.center,
          child: Text(
            noDataHintText ?? "No data found",
            style: const TextStyle(fontSize: 20),
          ),
        )
      ];
    }
    final rowDecoration = widget.rowDecoration ??
        const BoxDecoration(
            // border: Border(
            //   bottom: BorderSide(color: Colors.grey.shade300, width: 1),
            // ),
            );
    final selectedDecoration = widget.selectedDecoration ?? rowDecoration;
    final rows = <Widget>[];
    for (var i = 0, len = _source.length; i < len; i++) {
      final rowData = _source[i];
      rows.add(buildRow(rowData, i, rowDecoration, selectedDecoration));
    }
    return rows;
  }

  Widget buildRow(
    T rowData,
    int index,
    BoxDecoration rowDecoration,
    BoxDecoration selectedDecoration,
  ) {
    var isSelected = false;
    var decoration = rowDecoration;
    final textStyle = widget.rowTextStyle ?? _cellTextStyle;
    final selectedTextStyle = widget.selectedTextStyle ?? textStyle;
    final cells = <Widget>[];
    if (widget.showSelect) {
      isSelected = _selectedIdxs.contains(index);
      decoration = selectedDecoration;
      cells.add(
        buildCheckCell(
          value: _selectedIdxs.contains(index),
          onChanged: (value) {
            final checked = value == true;
            setState(() {
              if (checked) {
                if (!_selectedIdxs.contains(index)) {
                  _selectedIdxs.add(index);
                }
              } else {
                if (_selectedIdxs.contains(index)) {
                  _selectedIdxs.remove(index);
                }
              }
            });
            widget.onRowSelected?.call(checked, index, _selectedIdxs);
          },
        ),
      );
    }

    cells.addAll(
      widget.columns.map(
        (column) {
          final child = column.render != null
              ? column.render!.call(rowData, index)
              : Container(
                  padding: _cellPadding,
                  alignment: headerAlignSwitch(column.textAlign),
                  child: Wrap(
                    crossAxisAlignment: WrapCrossAlignment.center,
                    children: [
                      Tooltip(
                        message: column.textFormatter!.call(rowData, index),
                        child: Text(
                          _breakWord(
                              column.textFormatter!.call(rowData, index)),
                          textAlign: column.textAlign,
                          maxLines: 1,
                          overflow: TextOverflow.ellipsis,
                          style: isSelected
                              ? selectedTextStyle.copyWith(
                                  fontSize: column.textFontSize,
                                )
                              : textStyle.copyWith(
                                  fontSize: column.textFontSize,
                                ),
                        ),
                      )
                    ],
                  ),
                  // child: Text(
                  //   column.textFormatter!.call(rowData, index),
                  //   textAlign: column.textAlign,
                  //   style: isSelected
                  //       ? widget.selectedTextStyle
                  //       : widget.rowTextStyle,
                  // ),
                );
          final cell = buildCellBox(column, child);
          return Expanded(flex: column.actualFlex, child: cell);
        },
      ),
    );
    return Material(
      key: ValueKey("${index}_${rowData.hashCode}"),
      child: Ink(
        color: _currectSelected == index
            ? Theme.of(context).secondaryHeaderColor
            : index % 2 == 0
                ? Theme.of(context).scaffoldBackgroundColor
                : decoration.color ?? Colors.white,
        child: InkWell(
          mouseCursor: SystemMouseCursors.basic,
          onTap: () {
            setState(() {});
            _currectSelected = index;
            widget.onRowTap?.call(index);
          },
          hoverColor: Theme.of(context).secondaryHeaderColor,
          child: Container(
            decoration: decoration,
            child: Row(
              mainAxisSize: MainAxisSize.min,
              children: cells,
            ),
          ),
        ),
      ),
    );
  }

  Widget buildCellBox(TableColumn<T> column, Widget child) {
    if (!column.hasWidthLimit) return child;
    return Container(
      alignment: Alignment.center,
      width: column.width,
      constraints: BoxConstraints(
        maxWidth: column.maxWidth ?? double.infinity,
        minWidth: column.minWidth ?? 0.0,
      ),
      child: child,
    );
  }

  Widget buildCheckCell({
    required bool value,
    required ValueChanged<bool> onChanged,
  }) {
    return Container(
      width: widget.checkCellWidth,
      alignment: Alignment.center,
      child: Checkbox(
        activeColor: Theme.of(context).primaryColor,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(4),
        ),
        side: const BorderSide(
          color: Colors.grey,
          width: 1,
        ),
        value: value,
        onChanged: (val) {
          onChanged(val == true);
        },
      ),
    );
  }
}

/// 插入零宽空格
String _breakWord(String word) {
  if (word.isEmpty) return word;
  String breakWord = ' ';
  for (var element in word.runes) {
    breakWord += String.fromCharCode(element);
    breakWord += '\u200B';
  }
  return breakWord;
}