import 'dart:ui' as ui;
import 'package:fis_measure/interfaces/process/items/item_feature.dart';
import 'package:fis_measure/interfaces/process/workspace/application.dart';
import 'package:fis_measure/process/workspace/measure_data_controller.dart';
import 'package:fis_measure/values/colors.dart';
import 'package:fis_ui/index.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';

import 'converter.dart';

class MeasureResultPanel extends StatefulWidget {
  const MeasureResultPanel({Key? key}) : super(key: key);

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

class _MeasureResultPanelState extends State<MeasureResultPanel> {
  final _scrollController = ScrollController();
  final application = Get.find<IApplication>();
  final measureData = Get.find<MeasureDataController>();

  final List<ResultLine> lines = [];

  bool get hasOutputs => lines.isNotEmpty;

  @override
  Widget build(BuildContext context) {
    if (!hasOutputs || !measureData.measureSystemSetting.showResultWindow) {
      return const SizedBox();
    }

    return Align(
      alignment: _getAlignmentFromLocation(
          measureData.measureSystemSetting.showResultLocation),
      child: Container(
        margin: const EdgeInsets.only(left: 2, top: 2, right: 2, bottom: 2),
        constraints: const BoxConstraints(
          maxWidth: 600,
          minWidth: 150,
          maxHeight: 400,
        ),
        decoration: BoxDecoration(
          border: Border.all(
            color: MeasureColors.ResultBorder,
            width: 2,
          ),
          borderRadius: BorderRadius.circular(4),
          color: Colors.black.withOpacity(0.7),
        ),
        // padding: const EdgeInsets.only(left: 2),
        child: FThemeWidget(
          data: Theme.of(context).copyWith(
            scrollbarTheme: ScrollbarThemeData(
              thumbColor: MaterialStateProperty.all(
                MeasureColors.ResultScrollbar,
              ),
              crossAxisMargin: 1,
            ),
          ),
          child: FScrollbar(
            isAlwaysShown: false,
            controller: _scrollController,
            radius: ui.Radius.zero,
            child: FSingleChildScrollView(
              controller: _scrollController,
              child: FRepaintBoundary(
                child: FIntrinsicHeight(
                  child: FIntrinsicWidth(
                    child: FContainer(
                      margin: const EdgeInsets.fromLTRB(5, 1, 5, 5),
                      child: FColumn(
                        mainAxisSize: MainAxisSize.min,
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: _buildMainList(),
                      ),
                    ),
                  ),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }

  @override
  void initState() {
    _updateOutputs();
    application.updateRenderReady.addListener(_onMeasureRerenderReady);
    measureData.measureSystemSettingChanged
        .addListener(_onMeasureSystemSettingChanged);
    super.initState();
  }

  @override
  void dispose() {
    application.updateRenderReady.removeListener(_onMeasureRerenderReady);
    measureData.measureSystemSettingChanged
        .removeListener(_onMeasureSystemSettingChanged);
    super.dispose();
  }

  /// 样式更新事件监听
  void _onMeasureSystemSettingChanged(_, e) {
    _updateOutputs();
    setState(() {});
  }

  /// 面板对齐方式
  Alignment _getAlignmentFromLocation(int locationNum) {
    switch (locationNum) {
      case 0:
        return Alignment.topLeft;
      case 1:
        return Alignment.bottomLeft;
      case 2:
        return Alignment.topRight;
      case 3:
        return Alignment.bottomRight;
      default:
        return Alignment.topLeft;
    }
  }

  List<FWidget> _buildMainList() {
    final list = <FWidget>[
      _buildTitle(application.applicationName),
      _buildTitleDivider(),
    ];
    for (var line in lines) {
      list.add(_buildLine(line));
    }
    return list;
  }

  FWidget _buildLine(ResultLine result) {
    return FRow(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
      FText(
        result.label,
        style: TextStyle(
          fontSize: measureData.measureSystemSetting.fontSize.toDouble(),
          color: MeasureColors.Primary,
        ),
      ),
      const FSizedBox(width: 8),
      FText(
        result.value ?? '',
        style: TextStyle(
          fontSize: measureData.measureSystemSetting.fontSize.toDouble(),
          color: MeasureColors.Primary,
        ),
      ),
    ]);
  }

  FWidget _buildTitle(String title) {
    return FText(
      title,
      style: TextStyle(
        fontSize: measureData.measureSystemSetting.fontSize.toDouble() - 2,
        color: MeasureColors.Primary,
      ),
    );
  }

  FWidget _buildTitleDivider() {
    return const FDivider(
      color: Colors.white,
      height: 0.5,
      endIndent: 2,
    );
  }

  void _onMeasureRerenderReady(Object sender, void e) {
    if (mounted) {
      setState(() {
        _updateOutputs();
        _autoScrollToBottom();
      });
    }
  }

  void _updateOutputs() {
    lines.clear();
    final features = <IMeasureItemFeature>[];
    for (var item in application.measureItems) {
      if (item.measuredFeatures.isNotEmpty) {
        features.addAll(item.measuredFeatures);
      }
      if (item.feature != null) {
        features.add(item.feature!);
      }
    }
    final idLength = features.length.toString().length;
    for (var feature in features) {
      final strList = FeatureValueDescConverter(feature).generate(idLength);
      lines.addAll(strList);
    }
  }

  void _autoScrollToBottom() {
    if (lines.isEmpty) return;
    Future.delayed(const Duration(milliseconds: 200), () {
      if (_scrollController.hasClients) {
        _scrollController.jumpTo(_scrollController.position.maxScrollExtent);
      }
    });
  }
}

class ResultLine {
  ResultLine({required this.label, this.value});
  String label;
  String? value;

  bool get isNotEmpty => value != null && value!.isNotEmpty && label.isNotEmpty;
  @override
  String toString() => '$label  $value';
}