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

class LoginPhoneTextField extends StatelessWidget {
  const LoginPhoneTextField(
      {Key? key, required this.controller, this.helperText, this.rightWidget})
      : super(key: key);

  final TextEditingController controller;
  final String? helperText;
  final Widget? rightWidget;

  @override
  Widget build(BuildContext context) {
    Widget textField = SizedBox(
      height: 40,
      child: TextFieldBase(
        keyboardType: TextInputType.number,
        leftWidget: const Padding(
          padding: EdgeInsets.only(left: 10),
          child: Icon(
            Icons.perm_contact_calendar_sharp,
            color: Colors.grey,
            size: 20,
          ),
        ),
        rightWidget: rightWidget,
        hintText: '请输入账号',
        style: const TextStyle(color: Colors.white),
        controller: controller,
      ),
    );

    return helperText == null
        ? textField
        : Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              textField,
              Padding(
                padding: const EdgeInsets.only(top: 5),
                child: Text(
                  helperText!,
                  style: const TextStyle(fontSize: 12, color: Colors.grey),
                ),
              )
            ],
          );
  }
}

class LoginPasswordTextField extends StatefulWidget {
  const LoginPasswordTextField(
      {Key? key,
      required this.controller,
      this.hintText = '请输入密码',
      this.onSubmitted})
      : super(key: key);

  final TextEditingController controller;
  final String hintText;
  final ValueChanged<String>? onSubmitted;

  @override
  State<LoginPasswordTextField> createState() => _LoginPasswordTextFieldState();
}

class _LoginPasswordTextFieldState extends State<LoginPasswordTextField> {
  bool hideCancel = true;
  bool obsureText = true;

  @override
  Widget build(BuildContext context) {
    Widget cancel = Offstage(
      offstage: hideCancel,
      child: TextButton(
        style: ButtonStyle(
          overlayColor: MaterialStateProperty.all(Colors.transparent),
        ),
        onPressed: () {
          setState(() {
            obsureText = !obsureText;
          });
        },
        child: Icon(
          Icons.remove_red_eye_rounded,
          color: Colors.grey,
          size: 20,
        ),
      ),
    );

    widget.controller.addListener(() {
      setState(() {
        hideCancel = !widget.controller.text.isNotEmpty;
      });
    });

    return SizedBox(
      height: 40,
      child: TextFieldBase(
        hintText: widget.hintText,
        controller: widget.controller,
        obsureText: obsureText,
        onSubmitted: widget.onSubmitted,
        leftWidget: const Padding(
          padding: EdgeInsets.only(left: 10),
          child: Icon(
            Icons.lock_sharp,
            color: Colors.grey,
            size: 20,
          ),
        ),
        style: const TextStyle(color: Colors.white),
        rightWidget: cancel,
      ),
    );
  }
}

class TextFieldBase extends StatefulWidget {
  const TextFieldBase(
      {Key? key,
      this.leftWidget,
      this.rightWidget,
      this.hintText = '',
      required this.controller,
      this.obsureText = false,
      this.keyboardType,
      this.textAlign = TextAlign.start,
      this.onChanged,
      this.onSubmitted,
      this.inputFormatters,
      this.focusNode,
      this.decoration,
      this.style,
      this.noFocusSubmitted = false})
      : super(key: key);

  final TextEditingController controller;
  final FocusNode? focusNode;
  final Widget? leftWidget;
  final Widget? rightWidget;
  final InputDecoration? decoration;
  final TextStyle? style;
  final TextInputType? keyboardType;
  final String hintText;
  /// 暗文
  final bool obsureText;
  final TextAlign textAlign;
  final List<TextInputFormatter>? inputFormatters;
  /// 失去焦点是否回调
  final bool noFocusSubmitted;
  final ValueChanged<String>? onChanged;
  final ValueChanged<String>? onSubmitted;

  @override
  State<TextFieldBase> createState() => _TextFieldBaseState();
}

class _TextFieldBaseState extends State<TextFieldBase> {
  late FocusNode focusNode;

  @override
  void initState() {
    super.initState();

    focusNode = widget.focusNode ?? FocusNode();

    if (widget.onSubmitted != null && widget.noFocusSubmitted){
      focusNode.addListener(() {
        if (focusNode.hasFocus == false){
          widget.onSubmitted!(widget.controller.text);
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    final decoration = widget.decoration ??
        InputDecoration(
          prefixIcon: widget.leftWidget,
          prefixIconConstraints: const BoxConstraints(minWidth: 4),
          suffixIcon: widget.rightWidget,
          hintText: widget.hintText,
          hintStyle: const TextStyle(color: Colors.grey),
          border: MaterialStateOutlineInputBorder.resolveWith((states) =>
              const OutlineInputBorder(
                  borderSide: BorderSide(color: Colors.grey))),
          contentPadding:
          const EdgeInsets.only(left: 0, top: 0, bottom: 0, right: 15),
        );

    return TextField(
      focusNode: focusNode,
      controller: widget.controller,
      inputFormatters: widget.inputFormatters,
      style: widget.style ?? const TextStyle(fontSize: 14),
      keyboardType: widget.keyboardType,
      obscureText: widget.obsureText,
      textAlign: widget.textAlign,
      cursorColor: Colors.blue,
      onChanged: widget.onChanged,
      onSubmitted: widget.onSubmitted,
      decoration: decoration,
    );
  }
}