import 'package:flutter/material.dart';
import 'package:flutter_common/utils/sp_utils.dart';
import 'package:flutter_common/utils/toast_util.dart';
import 'package:flutter_common/widget/loading_widget.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:food_hub_app/apis/session.dart';
import 'package:food_hub_app/models/session.dart';
import 'package:food_hub_app/widgets/common/form.dart';
import 'package:food_hub_app/widgets/common/index.dart';
import 'package:form_builder_validators/form_builder_validators.dart';

class LoginPage extends StatefulWidget {
  const LoginPage({super.key});

  @override
  State<StatefulWidget> createState() => _LoginPage();
}

class _LoginPage extends State<LoginPage> {
  final GlobalKey _formKey = GlobalKey<FormState>();

  String _username = "Cxx0822", _password = "19940822Cxx";
  bool _isRemember = false;
  bool _isObscure = true;
  bool _isLoading = false;
  Color _eyeColor = Colors.grey;
  final List _loginMethod = [
    {"title": "phone", "icon": Icons.phone_android},
    {"title": "email", "icon": Icons.email},
    {"title": "wechat", "icon": Icons.wechat},
  ];

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

  Future<void> _loadRememberState() async {
    bool? isRemember = SPUtil.getBool('isRemember');
    if (isRemember) {
      setState(() {
        _isRemember = true;
        _username = SPUtil.getString('username');
        _password = SPUtil.getString('password');
      });
    }
  }

  void handleRememberState() {
    if (_isRemember) {
      SPUtil.set('isRemember', true);
      SPUtil.set('username', _username);
      SPUtil.set('password', _password);
    } else {
      SPUtil.set('isRemember', false);
      SPUtil.remove('username');
      SPUtil.remove('password');
    }
  }

  void handleTokenState(String token) {
    SPUtil.set('token', token);
  }

  void handleUserInfo(User user) {
    SPUtil.set('userId', user.id);
  }

  void loginClick() async {
    setState(() {
      _isLoading = true;
    });

    // 表单校验通过才会继续执行
    if ((_formKey.currentState as FormState).validate()) {
      (_formKey.currentState as FormState).save();

      try {
        LoadingDialog.show(context, message: '登录中');
        Session session = await loginApi(_username, _password);
        ToastUtil.success('登录成功');
        handleRememberState();
        handleTokenState(session.saToken.tokenValue);
        handleUserInfo(session.userInfo);
        
        LoadingDialog.hide(context);
        Navigator.pushNamed(context, '/home');
      } catch (e) {
        LoadingDialog.hide(context);
        ToastUtil.error(e.toString());
      }
    }

    setState(() {
      _isLoading = false;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Form(
        key: _formKey,
        child: Column(
          children: [
            Expanded(child: buildLoginForm()),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 50),
              child: Column(
                children: [
                  buildOtherLoginText(),
                  const SizedBox(height: 15),
                  buildOtherMethod(context),
                  const SizedBox(height: 20),
                  buildRegisterText(context),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget buildTitle() {
    return const Text(
      '食光集',
      textAlign: TextAlign.center,
      style: TextStyle(fontSize: 42),
    );
  }

  Widget buildLoginForm() {
    return ListView(
      padding: const EdgeInsets.symmetric(horizontal: 20),
      children: [
        const SizedBox(height: kToolbarHeight),
        buildTitle(),
        const SizedBox(height: 60),
        buildUsernameTextField(),
        const SizedBox(height: 20),
        buildPasswordTextField(),
        const SizedBox(height: 10),
        buildRememberPasswordCheckbox(),
        const SizedBox(height: 20),
        buildLoginButton(),
      ],
    );
  }

  Widget buildUsernameTextField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        formLabelText(labelText: "账号："),
        const SizedBox(height: 10),
        FormBuilderTextField(
          name: 'username',
          initialValue: _username,
          keyboardType: TextInputType.text,
          decoration: buildInputDecoration(
            context: context,
            hintText: "请输入账号",
            prefixIcon: Icons.person,
          ),
          validator: FormBuilderValidators.required(),
          onSaved: (v) => _username = v!,
        ),
      ],
    );
  }

  Widget buildPasswordTextField() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        formLabelText(labelText: "密码："),
        const SizedBox(height: 10),
        FormBuilderTextField(
          name: 'password',
          initialValue: _password,
          keyboardType: TextInputType.visiblePassword,
          obscureText: _isObscure,
          onSaved: (v) => _password = v!,
          validator: FormBuilderValidators.required(),
          decoration: buildInputDecoration(
            context: context,
            hintText: "请输入密码",
            prefixIcon: Icons.lock,
          ).copyWith(
            suffixIcon: IconButton(
              icon: Icon(Icons.remove_red_eye, color: _eyeColor),
              onPressed: () {
                final colors = Theme.of(context).colorScheme;
                setState(() {
                  _isObscure = !_isObscure;
                  _eyeColor = (_isObscure ? Colors.grey : colors.surface);
                });
              },
            ),
          ),
        ),
      ],
    );
  }

  Widget buildRememberPasswordCheckbox() {
    return Row(
      children: [
        Checkbox(
          materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
          visualDensity: VisualDensity.compact,
          value: _isRemember,
          onChanged: (bool? value) {
            setState(() {
              _isRemember = value ?? false;
            });
          },
        ),
        const Text('记住密码', style: TextStyle(color: Colors.grey, fontSize: 14)),
      ],
    );
  }

  Widget buildLoginButton() {
    return SizedBox(
      height: 45,
      width: double.infinity,
      child: ElevatedButton(
        onPressed: _isLoading ? null : loginClick,
        style: ElevatedButton.styleFrom(
          backgroundColor: Theme.of(context).colorScheme.primary,
          foregroundColor: Colors.white,
          elevation: 0,
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
        ),
        child: const Text(
          '登录',
          style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
        ),
      ),
    );
  }

  Widget buildOtherLoginText() {
    return Row(
      children: [
        Expanded(child: Divider(color: Colors.grey[300], thickness: 1)),
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 16),
          child: Text(
            '其他方式登录',
            style: TextStyle(color: Colors.grey, fontSize: 14),
          ),
        ),
        Expanded(child: Divider(color: Colors.grey[300], thickness: 1)),
      ],
    );
  }

  Widget buildOtherMethod(context) {
    return OverflowBar(
      alignment: MainAxisAlignment.center,
      children:
          _loginMethod
              .map(
                (item) => Builder(
                  builder: (context) {
                    return IconButton(
                      icon: Icon(
                        item['icon'],
                        color: Theme.of(context).iconTheme.color,
                      ),
                      onPressed: () {
                        //TODO: 第三方登录方法
                        ScaffoldMessenger.of(context).showSnackBar(
                          SnackBar(
                            content: Text('${item['title']}登录'),
                            action: SnackBarAction(
                              label: '取消',
                              onPressed: () {},
                            ),
                          ),
                        );
                      },
                    );
                  },
                ),
              )
              .toList(),
    );
  }

  Widget buildRegisterText(context) {
    return Center(
      child: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const Text('没有账号?', style: TextStyle(fontSize: 18)),
          GestureDetector(
            child: const Text(
              '点击注册',
              style: TextStyle(fontSize: 18, color: Colors.green),
            ),
            onTap: () {
              print("点击注册");
            },
          ),
        ],
      ),
    );
  }
}