import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:hgdj/assets_tool/app_colors.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';

// 回弹弹簧：临界阻尼(≈2√(stiffness·mass)=34.6) → 松手快速收回不过冲
// 注：实测此调优手感优于 3.16.8 包默认(mass2.2/stiffness150/damping16，欠阻尼、回弹更夸张)，
//     故采用这套调优值，不复刻 3.16.8 原值
// 提成常量供横向的 HorizontalLoadMore 复用，两处手感必须一致，改这里即全改
const SpringDescription kRefreshSpring =
    SpringDescription(mass: 1.5, stiffness: 200, damping: 35);
const double kRefreshDragSpeedRatio = 0.91;

Widget pullYsRefresh({
  required RefreshViewOnInit onInit,
  required Widget child,
  Key? key,
  final Function(RefreshController? ctr)? onRefresh,
  final Function(RefreshController? ctr)? onLoading,
  bool enablePullUp = true,
  bool enablePullDown = true,
  String noDataText = "——  没有更多数据了  ——",
  Widget? customHeader,
  Widget? footerHeader,
}) {
  return CustomRefreshView(
    onInit: onInit,
    onLoading: onLoading,
    onRefresh: onRefresh,
    customHeader: customHeader,
    footerHeader: footerHeader,
    enablePullDown: enablePullDown,
    enablePullUp: enablePullUp,
    noDataText: noDataText,
    child: child,
  );
}

typedef RefreshViewOnInit = Function(RefreshController controller);

class CustomRefreshView extends StatefulWidget {
  final bool enablePullDown;
  final bool enablePullUp;
  final Function(RefreshController? ctr)? onRefresh;
  final Function(RefreshController? ctr)? onLoading;
  final Widget? customHeader;
  final Widget? footerHeader;
  final Widget child;
  final String noDataText;
  final RefreshViewOnInit onInit;

  const CustomRefreshView({
    super.key,
    required this.child,
    required this.onInit,
    this.enablePullDown = true,
    this.enablePullUp = true,
    this.onRefresh,
    this.onLoading,
    this.customHeader,
    this.footerHeader,
    this.noDataText = "——  没有更多数据了  ——",
  });

  @override
  State<CustomRefreshView> createState() => _CustomIRefreshViewState();
}

class _CustomIRefreshViewState extends State<CustomRefreshView> {
  final refreshCtr = RefreshController();

  @override
  void initState() {
    widget.onInit(refreshCtr);
    super.initState();
  }

  @override
  void dispose() {
    //组件创建的 controller 由组件释放（谁创建谁释放）
    refreshCtr.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return RefreshConfiguration(
      springDescription: kRefreshSpring,
      dragSpeedRatio: kRefreshDragSpeedRatio,
      maxOverScrollExtent: 60,
      maxUnderScrollExtent: 0,
      enableBallisticRefresh: false, // 下拉不靠惯性触发刷新
      enableBallisticLoad: true, // 上拉滑到底自动加载
      //去掉 StretchingOverscrollIndicator，避免与下拉刷新冲突
      child: ScrollConfiguration(
        behavior: NoStretchScrollBehavior(),
        child: SmartRefresher(
            enablePullDown: widget.enablePullDown,
            enablePullUp: widget.enablePullUp,
            controller: refreshCtr,
            onRefresh: () => widget.onRefresh?.call(refreshCtr),
            onLoading: () => widget.onLoading?.call(refreshCtr),
            header: widget.customHeader ??
                WaterDropHeader(
                  waterDropColor: AppColors.actionRed,
                  // iOS 刷新菊花用主题色；Android 保持默认 loading
                  refresh: Platform.isIOS
                      ? const CupertinoActivityIndicator(
                          color: AppColors.actionRed)
                      : null,
                  complete: const Text(
                    "刷新完成！",
                    style: TextStyle(
                        color: AppColors.tipTextColor99, fontSize: 12),
                  ),
                  failed: const Text(
                    "刷新失敗!",
                    style: TextStyle(
                        color: AppColors.tipTextColor99, fontSize: 12),
                  ),
                ),
            footer: widget.footerHeader ??
                ClassicFooter(
                  loadingText: "加载中...",
                  canLoadingText: "松开加载更多...",
                  noDataText: widget.noDataText,
                  idleText: "上拉加载更多",
                  // Android 默认转圈是蓝色，改成主题色；iOS 保持菊花
                  loadingIcon: SizedBox(
                    width: 25,
                    height: 25,
                    child: Platform.isIOS
                        ? const CupertinoActivityIndicator()
                        : const CircularProgressIndicator(
                            strokeWidth: 2.0,
                            valueColor:
                                AlwaysStoppedAnimation(AppColors.actionRed),
                          ),
                  ),
                  textStyle: TextStyle(
                    color: AppColors.tipTextColor99,
                    fontSize: 12,
                    decoration: TextDecoration.none,
                    fontWeight: FontWeight.normal,
                  ),
                ),
            child: widget.child),
      ),
    );
  }
}

//还原 Flutter 3.16 时代的滚动行为
class NoStretchScrollBehavior extends MaterialScrollBehavior {
  //去掉 StretchingOverscrollIndicator，避免与下拉刷新冲突
  @override
  Widget buildOverscrollIndicator(
    BuildContext context,
    Widget child,
    ScrollableDetails details,
  ) {
    return child;
  }

  //还原旧版多指拖拽策略（3.19+ 改为 latestPointer，拖拽手感有细微差异）
  @override
  MultitouchDragStrategy getMultitouchDragStrategy(BuildContext context) {
    return MultitouchDragStrategy.averageBoundaryPointers;
  }

  //使用 BouncingScrollPhysics 还原弹性下拉手感
  @override
  ScrollPhysics getScrollPhysics(BuildContext context) {
    return const BouncingScrollPhysics();
  }
}