/*
 * @Author: XianKaiQun
 * @Date: 2020-09-14 09:34:57
 * @LastEditors: wjc
 * @LastEditTime: 2023-01-11 09:42:06
 * @Description:
 */
import 'package:flutter/material.dart';
import 'package:wisdom_cli/src/assets.gen.dart';
import 'package:wisdom_cli/wisdom_cli.dart';

///搜索组件
class WSearch extends StatefulWidget {
  WSearch({
    Key? key,
    this.hintText,
    this.controller,
    this.onSubmitted,
    this.onCancel,
    this.onChanged,
    this.moonlight = true,
    this.isDark = false,
    this.padding,
    this.backColor,
    this.isStatic = false,
    this.isControlOutside = false,
    this.initValue,
    this.onInput,
  }) : super(key: key);
  final String? hintText;
  final TextEditingController? controller;
  final void Function(String value)? onSubmitted;
  final void Function(String value)? onChanged;
  final void Function()? onCancel;
  final void Function(bool value)? onInput;
  final EdgeInsetsGeometry? padding;
  final backColor;
  final String? initValue;
  final bool? isControlOutside;

  /// 搜索文字是否固定显示
  final bool isStatic;

  ///朦胧层
  final bool moonlight;

  /// 背景是否深色 默认是白色
  final bool isDark;
  @override
  _WSearchState createState() => _WSearchState();
}

class _WSearchState extends State<WSearch> {
  FocusNode? focusNode;
  TextEditingController? controller;
  GlobalKey globalKey = GlobalKey();
  String? value;
  Size? size;
  Offset? offset;
  OverlayEntry? entry;
  bool hasEntry = false;
  @override
  void initState() {
    controller = new TextEditingController();
    focusNode = new FocusNode();
    value = widget.initValue ?? '';
    if (widget.isControlOutside! && controller?.value != null) {
      controller!.value = TextEditingValue(
        text: widget.initValue ?? '',
        selection: TextSelection.fromPosition(
          TextPosition(
              affinity: TextAffinity.downstream, offset: value!.length),
        ),
      );
    }
    focusNode!.addListener(onfocus);
    super.initState();
  }

  @override
  void didUpdateWidget(WSearch oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (widget.isControlOutside! && controller?.value != null) {
      controller!.value = TextEditingValue(
        text: widget.initValue ?? '',
        selection: TextSelection.fromPosition(
          TextPosition(
              affinity: TextAffinity.downstream, offset: value!.length),
        ),
      );
      setState(() {});
    }
  }

  ///获取焦点时，显示朦胧层。
  ///通过globalKey获取当前input组件的绝对位置，
  ///然后通过[OverlayEntry]显示朦胧层铺满剩余位置，
  ///点击朦胧层触发`onCancel`事件
  onfocus() {
    if (focusNode!.hasFocus && widget.moonlight) {
      final RenderBox renderBox =
          globalKey.currentContext!.findRenderObject() as RenderBox;
      offset = renderBox.localToGlobal(Offset.zero);
      size = renderBox.size;

      entry = OverlayEntry(
        builder: (_) {
          return Positioned.fill(
            top: offset!.dy + size!.height,
            child: GestureDetector(
              onTap: () => onCancel(),
              child: ColoredBox(
                color: Colors.black26,
              ),
            ),
          );
        },
      );
      Overlay.of(context).insert(entry!);
      hasEntry = true;
    } else {
      hasEntry = false;
      entry?.remove();
    }
    setState(() {});
  }

  @override
  void dispose() {
    value = '';
    focusNode!.dispose();
    controller!.dispose();
    if (hasEntry) {
      entry!.remove();
    }
    super.dispose();
  }

  void onCancel() {
    setState(() {
      value = '';
      controller!.clear();
      focusNode!.unfocus();
      if (widget.onInput != null) {
        widget.onInput!(false);
      }

      if (widget.onCancel != null) {
        widget.onCancel!();
      }
    });
  }

  void onSubmitted(String v) {
    value = v;
    controller!.value = TextEditingValue(
      text: value!,
      selection: TextSelection.fromPosition(
        TextPosition(affinity: TextAffinity.downstream, offset: value!.length),
      ),
    );
    setState(() {});
    if (widget.onSubmitted != null) {
      widget.onSubmitted!(v);
    }
    if (widget.onInput != null) {
      widget.onInput!(false);
    }
  }

  void onChanged(String v) {
    value = v;
    setState(() {});
    if (widget.onChanged != null) {
      widget.onChanged!(v);
    }
    if (widget.onInput != null) {
      widget.onInput!(false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final style = WTheme.of(context);
    final colorScheme = style.colorScheme;
    final _isStatic = widget.isStatic;
    return Wisdom.row(
      key: globalKey,
      padding: widget.padding ?? EdgeInsets.symmetric(vertical: 12.pt),
      color: widget.backColor ?? Colors.transparent,
      children: [
        SizedBox(width: 15.pt),
        TextFormField(
          onTap: () => {
            if (widget.onInput != null)
              {
                widget.onInput!(true),
              }
          },
          controller: controller,
          onFieldSubmitted: onSubmitted,
          focusNode: focusNode,
          onChanged: onChanged,
          textInputAction: TextInputAction.search,
          style: TextStyle(
            fontSize: 15.pt,
            textBaseline: TextBaseline.alphabetic,
          ),
          decoration: InputDecoration(
            hintText: widget.hintText,
            isCollapsed: true,
            hintStyle: TextStyle(
              color: Color(0xff999999),
              fontSize: 14.pt,
              textBaseline: TextBaseline.alphabetic,
            ),
            prefixIcon: Image(
              image: AssetList.$search_png_image,
              height: 15.pt,
            ),
            prefixIconConstraints: BoxConstraints(
              minWidth: 32.pt,
            ),
            // suffix: Text.rich(
            //   WidgetSpan(
            //     alignment: PlaceholderAlignment.middle,
            //     baseline: TextBaseline.alphabetic,
            //     child: WDot.delete(
            //       onTap: () => {
            //         value = '',
            //         controller.clear(),
            //         setState(() {}),
            //       },
            //       color: Colors.black12,
            //       iconTheme: IconThemeData(color: Colors.grey, size: 13.pt),
            //     ),
            //   ),
            // ),
            filled: true,
            isDense: true,
            fillColor: widget.isDark ? colorScheme.background4 : Colors.white,
            contentPadding: EdgeInsets.symmetric(vertical: 11.pt),
            enabledBorder: UnderlineInputBorder(
              /// 边框不设置一个值会有个黑边
              borderSide: BorderSide(color: Colors.white, width: 0.1.pt),
              borderRadius: BorderRadius.circular(25.pt),
            ),
            focusedBorder: UnderlineInputBorder(
              /// 边框不设置一个值会有个黑边
              borderSide: BorderSide(color: Colors.white, width: 0.1.pt),
              borderRadius: BorderRadius.circular(25.pt),
            ),
          ),
        ).nestExpanded(),
        if (!focusNode!.hasFocus && !_isStatic) SizedBox(width: 15.pt),
        if (_isStatic)
          Wisdom(
            onTap: () => {
              onSubmitted(value!),
              focusNode!.unfocus(),
            },
            alignment: Alignment.center,
            margin: EdgeInsets.symmetric(horizontal: 5.pt),
            padding: EdgeInsets.symmetric(horizontal: 10.pt),
            child: WisText(
              '搜索',
              size: 14.pt,
              color: colorScheme.primary,
              weight: FontWeight.w400,
              textAlign: TextAlign.center,
            ),
          ),
        if (focusNode!.hasFocus && !_isStatic)
          Wisdom(
            onTap: () => onCancel(),
            height: 25.pt,
            alignment: Alignment.center,
            margin: EdgeInsets.symmetric(horizontal: 5.pt),
            padding: EdgeInsets.symmetric(horizontal: 10.pt),
            child: Text(
              '取消',
              textAlign: TextAlign.center,
              style: TextStyle(fontSize: 13.pt),
            ),
          ),
      ],
    );
  }
}