import 'dart:math' as math;

import 'package:flutter/material.dart';
import 'package:shadcn_ui/shadcn_ui.dart';

/// ShadTable.list를 감싼 공통 테이블 래퍼.
class SuperportTable extends StatelessWidget {
  const SuperportTable({
    super.key,
    required List<Widget> columns,
    required List<List<Widget>> rows,
    this.columnSpanExtent,
    this.rowHeight = 56,
    this.maxHeight,
    this.onRowTap,
    this.emptyLabel = '데이터가 없습니다.',
  }) : _columns = columns,
       _rows = rows,
       _headerCells = null,
       _rowCells = null;

  const SuperportTable.fromCells({
    super.key,
    required List<ShadTableCell> header,
    required List<List<ShadTableCell>> rows,
    this.columnSpanExtent,
    this.rowHeight = 56,
    this.maxHeight,
    this.onRowTap,
    this.emptyLabel = '데이터가 없습니다.',
  }) : _columns = null,
       _rows = null,
       _headerCells = header,
       _rowCells = rows;

  final List<Widget>? _columns;
  final List<List<Widget>>? _rows;
  final List<ShadTableCell>? _headerCells;
  final List<List<ShadTableCell>>? _rowCells;
  final TableSpanExtent? Function(int index)? columnSpanExtent;
  final double rowHeight;
  final double? maxHeight;
  final void Function(int index)? onRowTap;
  final String emptyLabel;

  @override
  Widget build(BuildContext context) {
    late final List<ShadTableCell> headerCells;
    late final List<List<ShadTableCell>> tableRows;

    if (_rowCells case final rows?) {
      if (rows.isEmpty) {
        final theme = ShadTheme.of(context);
        return Padding(
          padding: const EdgeInsets.all(32),
          child: Center(child: Text(emptyLabel, style: theme.textTheme.muted)),
        );
      }
      final header = _headerCells;
      if (header == null) {
        throw StateError('header cells must not be null when using fromCells');
      }
      headerCells = header;
      tableRows = rows;
    } else {
      final rows = _rows;
      if (rows == null || rows.isEmpty) {
        final theme = ShadTheme.of(context);
        return Padding(
          padding: const EdgeInsets.all(32),
          child: Center(child: Text(emptyLabel, style: theme.textTheme.muted)),
        );
      }
      headerCells = _columns!
          .map(
            (cell) => cell is ShadTableCell
                ? cell
                : ShadTableCell.header(child: cell),
          )
          .toList();
      tableRows = [
        for (final row in rows)
          row
              .map(
                (cell) =>
                    cell is ShadTableCell ? cell : ShadTableCell(child: cell),
              )
              .toList(),
      ];
    }

    final estimatedHeight = (tableRows.length + 1) * rowHeight;
    final minHeight = rowHeight * 2;
    final effectiveHeight = math.max(
      minHeight,
      maxHeight == null
          ? estimatedHeight
          : math.min(estimatedHeight, maxHeight!),
    );

    return SizedBox(
      height: effectiveHeight,
      child: ShadTable.list(
        header: headerCells,
        columnSpanExtent: columnSpanExtent,
        rowSpanExtent: (_) => FixedTableSpanExtent(rowHeight),
        onRowTap: onRowTap,
        primary: false,
        children: tableRows,
      ),
    );
  }
}