import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:tuple/tuple.dart';

class MyTheme {
  MyTheme._();
  static const Color grayBg = Color(0xFFEEEEEE);
  static const Color white = Color(0xFFFFFFFF);
  static const Color accent = Color(0xFF0071FF);
  static const Color accent50 = Color(0x770071FF);
  static const Color canvasColor = Color(0xFF212121);
  static const Color border = Color(0xFFCCCCCC);
}

void showLoading(String text, BuildContext context) {
  if (_hasDialog && context != null) {
    Navigator.pop(context);
  }
  dismissLoading();
  EasyLoading.show(status: text);
}

void dismissLoading() {
  EasyLoading.dismiss();
}

void showSuccess(String text) {
  dismissLoading();
  EasyLoading.showSuccess(text);
}

bool _hasDialog = false;
typedef BuildAlertDailog = Tuple3<Widget, Widget, List<Widget>> Function(
    void Function(void Function()));

Future<T> showAlertDialog<T>(BuildContext context, BuildAlertDailog build,
    [WillPopCallback onWillPop,
    bool barrierDismissible = false,
    double contentPadding = 20]) async {
  dismissLoading();
  if (_hasDialog) {
    Navigator.pop(context);
  }
  _hasDialog = true;
  var dialog = StatefulBuilder(builder: (context, setState) {
    var widgets = build(setState);
    if (onWillPop == null) onWillPop = () async => false;
    return WillPopScope(
        onWillPop: onWillPop,
        child: AlertDialog(
          title: widgets.item1,
          contentPadding: EdgeInsets.all(contentPadding),
          content: widgets.item2,
          actions: widgets.item3,
        ));
  });
  var res = await showDialog<T>(
      context: context,
      barrierDismissible: barrierDismissible,
      builder: (context) => dialog);
  _hasDialog = false;
  return res;
}

void msgbox(String type, String title, String text, BuildContext context,
    [bool hasCancel]) {
  if (hasCancel == null) {
    hasCancel = type != 'error';
  }
  showAlertDialog(
      context,
      (_) => Tuple3(Text(title), Text(text), [
            hasCancel
                ? FlatButton(
                    textColor: MyTheme.accent,
                    onPressed: () {
                      Navigator.pop(context);
                    },
                    child: Text('Cancel'),
                  )
                : Spacer(),
            FlatButton(
              textColor: MyTheme.accent,
              onPressed: () {
                Navigator.pop(context);
                Navigator.pop(context);
              },
              child: Text('OK'),
            ),
          ]));
}

class PasswordWidget extends StatefulWidget {
  PasswordWidget({Key key, this.controller}) : super(key: key);

  final TextEditingController controller;

  @override
  _PasswordWidgetState createState() => _PasswordWidgetState();
}

class _PasswordWidgetState extends State<PasswordWidget> {
  bool _passwordVisible = false;
  @override
  Widget build(BuildContext context) {
    return TextField(
      autofocus: true,
      keyboardType: TextInputType.text,
      controller: widget.controller,
      obscureText: !_passwordVisible, //This will obscure text dynamically
      decoration: InputDecoration(
        labelText: 'Password',
        hintText: 'Enter your password',
        // Here is key idea
        suffixIcon: IconButton(
          icon: Icon(
            // Based on passwordVisible state choose the icon
            _passwordVisible ? Icons.visibility : Icons.visibility_off,
            color: Theme.of(context).primaryColorDark,
          ),
          onPressed: () {
            // Update the state i.e. toogle the state of passwordVisible variable
            setState(() {
              _passwordVisible = !_passwordVisible;
            });
          },
        ),
      ),
    );
  }
}

Color str2color(String str, [alpha = 0xFF]) {
  var hash = 160 << 16 + 114 << 8 + 91;
  for (var i = 0; i < str.length; i += 1) {
    hash = str.codeUnitAt(i) + ((hash << 5) - hash);
  }
  return Color((hash & 0xFFFFFF) | (alpha << 24));
}