import 'package:flutter/material.dart';

class VSearchInput extends StatelessWidget {
  /// 占位提示
  final String? placeholder;

  /// 搜索回调
  final ValueChanged<String>? onSearch;

  /// 清空回调
  final VoidCallback? onClear;

  /// 是否可一键清空
  final bool? clearable;

  final TextEditingController? textEditingController;

  const VSearchInput({
    super.key,
    this.placeholder,
    this.onSearch,
    this.clearable,
    this.onClear,
    this.textEditingController,
  });

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (_, c) {
        final controller = textEditingController ?? TextEditingController();
        final radius = c.maxHeight / 2;
        final border = OutlineInputBorder(
          borderRadius: BorderRadius.all(Radius.circular(radius)),
          borderSide: BorderSide.none,
        );

        return TextField(
          style: const TextStyle(fontSize: 20),
          controller: controller,
          decoration: InputDecoration(
            enabledBorder: border,
            focusedBorder: border,
            fillColor: const Color.fromRGBO(238, 238, 238, 1),
            filled: true,
            hintText: placeholder,
            hintStyle: const TextStyle(
              fontSize: 20,
              color: Colors.black54,
            ),
            contentPadding: EdgeInsets.symmetric(
              horizontal: radius * 1.2,
              vertical: (c.maxHeight - 24) / 2,
            ),
            // isDense: true,
            isCollapsed: false,
            // prefixIcon: prefixIcon,
            // suffixIcon: suffixIcon,
            suffixIcon: Row(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                if (clearable == true)
                  _ClearableSuffixIcon(
                    controller: controller,
                    onTap: onClear,
                  ),
                IconButton(
                  icon: const Icon(Icons.search, size: 36),
                  onPressed: () {
                    onSearch?.call(controller.text);
                  },
                ),
                const SizedBox(width: 8),
              ],
            ),
          ),
          onSubmitted: (value) {
            onSearch?.call(value);
          },
        );
      },
    );
  }
}

class _ClearableSuffixIcon extends StatefulWidget {
  final TextEditingController controller;
  final VoidCallback? onTap;

  const _ClearableSuffixIcon({required this.controller, this.onTap});
  @override
  State<StatefulWidget> createState() => _ClearableSuffixIconState();
}

class _ClearableSuffixIconState extends State<_ClearableSuffixIcon> {
  late TextEditingController controller;
  bool isShowIcon = false;

  @override
  void initState() {
    controller = widget.controller;
    WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
      if (mounted) {
        controller.addListener(onTextUpdate);
      }
    });
    super.initState();
  }

  @override
  void dispose() {
    controller.removeListener(onTextUpdate);
    super.dispose();
  }

  void onTextUpdate() {
    final isNeedShow = controller.text.isNotEmpty;
    if (isShowIcon != isNeedShow) {
      setState(() {
        isShowIcon = isNeedShow;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    if (isShowIcon) {
      return IconButton(
        color: Colors.black,
        icon: Container(
          padding: const EdgeInsets.all(4),
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(16),
            color: Colors.black26,
          ),
          child: const Icon(Icons.close, size: 22, color: Colors.white),
        ),
        onPressed: () {
          controller.clear();
          widget.onTap?.call();
        },
      );
    } else {
      return const SizedBox();
    }
  }
}