import 'dart:convert';
import 'dart:io';
import 'package:qhd_prevention/customWidget/custom_alert_dialog.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:qhd_prevention/customWidget/custom_button.dart';
import 'package:qhd_prevention/customWidget/toast_util.dart';
import 'package:qhd_prevention/http/ApiService.dart';
import 'package:qhd_prevention/pages/mine/forgot_pwd_page.dart';
import 'package:qhd_prevention/pages/mine/mine_set_pwd_page.dart';
import 'package:qhd_prevention/pages/mine/webViewPage.dart';
import 'package:qhd_prevention/pages/user/CustomInput.dart';
import 'package:qhd_prevention/pages/user/choose_userFirm_page.dart';
import 'package:qhd_prevention/pages/user/full_userinfo_page.dart';
import 'package:qhd_prevention/pages/user/register_page.dart';
import 'package:qhd_prevention/services/auth_service.dart';
import 'package:qhd_prevention/tools/tools.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:qhd_prevention/pages/main_tab.dart';
import 'package:qhd_prevention/services/SessionService.dart';

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

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

class _LoginPageState extends State<LoginPage> {
  final TextEditingController _phoneController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  final TextEditingController _codeController = TextEditingController();
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
  final FocusNode _phoneFocusNode = FocusNode();
  final FocusNode _passwordFocusNode = FocusNode();
  final FocusNode _codeFocusNode = FocusNode();

  String _errorMessage = '';
  bool _isLoading = false;
  bool _obscurePassword = true;
  bool _agreed = false;
  String _captchaImageBase64 = '';
  String _captchaIdentifier = '';
  bool _rememberPassword = true;

  @override
  void initState() {
    super.initState();
    _phoneController.addListener(_onTextChanged);
    _getData();
    _getCaptcha();
    _phoneController.text = SessionService.instance.loginPhone ?? "";
    _passwordController.text = SessionService.instance.loginPass ?? "";
  }

  @override
  void dispose() {
    _phoneController.removeListener(_onTextChanged);
    _phoneController.dispose();
    _passwordController.dispose();
    _codeController.dispose();
    _phoneFocusNode.dispose();
    _passwordFocusNode.dispose();
    _codeFocusNode.dispose();
    super.dispose();
  }

  Future<void> _getCaptcha() async {
    try{
      final response = await AuthApi.getUserCaptcha();
      if (response['success']) {
        setState(() {
          _captchaImageBase64 = response['data']['img'];
          _captchaIdentifier = response['data']['captchaKey'];
        });
      }
    }catch(e){
      print(e);
    }

  }

  Future<void> _getData() async {
    final prefs = await SharedPreferences.getInstance();
    setState(() {
      _phoneController.text = prefs.getString('savePhone') ?? '';
      _passwordController.text = prefs.getString('savePass') ?? '';
    });
  }

  Future<void> _saveData(String phone, String pass) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString("savePhone", phone);
    await prefs.setString("savePass", pass);
  }

  void _onTextChanged() {
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    final screenHeight = MediaQuery.of(context).size.height;
    double height = 230.0;
    return Scaffold(
      backgroundColor: Colors.white,
      resizeToAvoidBottomInset: true,
      body: Stack(
        children: [
          // 背景图：铺满屏幕
          Positioned(
            left: 0,
            top: 0,
            right: 0,
            child: Image.asset(
              'assets/images/loginbg.png',
              fit: BoxFit.fitWidth,
            ),
          ),
          Positioned(
            top: 0,
            left: 20,
            right: 0,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const SizedBox(height: 70), // 顶部间距
                Image.asset(
                  "assets/images/g_logo.png",
                  width: 40,
                  height: 40,
                ),
                const SizedBox(height: 10),
                const Text(
                  "欢迎使用",
                  style: TextStyle(
                    color: Colors.white,
                    fontSize: 23,
                    fontWeight: FontWeight.w500,
                  ),
                ),
                const Text(
                  "秦港-相关方安全管理平台",
                  style: TextStyle(
                    color: Colors.white,
                    fontSize: 23,
                    fontWeight: FontWeight.w500,
                  ),
                ),
                const SizedBox(height: 20),
              ],
            ),
          ),
          Positioned(
            bottom: 0,
            left: 0,
            right: 0,
            top: height,
            child: GestureDetector(
              onTap: () => FocusScope.of(context).unfocus(),
              child: SafeArea(
                child: Form(
                  key: _formKey,
                  child: SingleChildScrollView(
                    // 让内容至少占满屏高，并且内容可以滚动
                    child: ConstrainedBox(
                      constraints: BoxConstraints(minHeight: screenHeight-height-50),
                      child: IntrinsicHeight(
                        child: Container(
                          padding: const EdgeInsets.symmetric(horizontal: 16),
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              // 中间可滚动表单区域（左右内边距）
                              Container(
                                // color: Colors.white,
                                child: Padding(
                                  padding: const EdgeInsets.symmetric(
                                    horizontal: 20,
                                  ),
                                  child: Column(
                                    crossAxisAlignment: CrossAxisAlignment.center,
                                    children: [
                                      // const SizedBox(height: 60),
                                      CustomInput.buildInput(
                                        _phoneController,
                                        title: "手机号",
                                        hint: "请输入您的手机号",
                                        keyboardType: TextInputType.phone,
                                        suffix:
                                        _phoneController.text.isEmpty
                                            ? SizedBox()
                                            : IconButton(
                                          icon: const Icon(
                                            Icons.cancel,
                                            size: 20,
                                            color: Colors.grey,
                                          ),
                                          onPressed:
                                              () => setState(
                                                () =>
                                                _phoneController
                                                    .clear(),
                                          ),
                                        ),
                                        validator: (v) {
                                          if (v == null || v.isEmpty)
                                            return '请输入您的手机号';
                                          return null;
                                        },
                                      ),
                                      const SizedBox(height: 20),

                                      CustomInput.buildInput(
                                        title: "密码",
                                        _passwordController,
                                        hint: "请输入您的密码",
                                        obscure: _obscurePassword,
                                        suffix: IconButton(
                                          icon: Icon(
                                            _obscurePassword
                                                ? Icons.visibility_off
                                                : Icons.visibility,
                                            color: Colors.grey,
                                          ),
                                          onPressed:
                                              () => setState(
                                                () =>
                                            _obscurePassword =
                                            !_obscurePassword,
                                          ),
                                        ),
                                        validator: (v) {
                                          if (v == null || v.isEmpty)
                                            return '请输入密码';
                                          return null;
                                        },
                                      ),

                                      const SizedBox(height: 20),
                                      Row(
                                        mainAxisAlignment:
                                        MainAxisAlignment.spaceBetween,
                                        children: [
                                          Text(
                                            '验证码',
                                            style: TextStyle(
                                              fontSize: 17,
                                              fontWeight: FontWeight.bold,
                                            ),
                                          ),
                                          const SizedBox(),
                                        ],
                                      ),

                                      // 验证码行
                                      SizedBox(
                                        height: 60,
                                        child: Row(
                                          children: [
                                            Expanded(
                                              child: Padding(
                                                padding: const EdgeInsets.only(
                                                  left: 0,
                                                  right: 10,
                                                ),
                                                child: TextFormField(
                                                  controller: _codeController,
                                                  focusNode: _codeFocusNode,
                                                  keyboardType:
                                                  TextInputType.number,
                                                  decoration: const InputDecoration(
                                                    hintText: '请输入验证码',
                                                    hintStyle: TextStyle(
                                                      color: Colors.black26,
                                                    ),
                                                    border: InputBorder.none,
                                                    contentPadding: EdgeInsets.zero,
                                                  ),
                                                  style: const TextStyle(
                                                    color: Colors.black,
                                                  ),
                                                ),
                                              ),
                                            ),

                                            Padding(
                                              padding: const EdgeInsets.symmetric(
                                                horizontal: 10,
                                              ),
                                              child: _buildCaptchaImage(),
                                            ),
                                          ],
                                        ),
                                      ),
                                      const Divider(),

                                      const SizedBox(height: 10),

                                      if (_errorMessage.isNotEmpty)
                                        Padding(
                                          padding: const EdgeInsets.symmetric(
                                            horizontal: 25,
                                          ),
                                          child: Text(
                                            _errorMessage,
                                            style: const TextStyle(
                                              color: Colors.red,
                                            ),
                                          ),
                                        ),

                                      _remenbemberPWDAndRegister(),
                                      const SizedBox(height: 10),

                                      CustomButton(
                                        text: '登录',
                                        backgroundColor: const Color(0xFF2A75F8),
                                        height: 50,
                                        textStyle: const TextStyle(
                                          fontSize: 16,
                                          fontWeight: FontWeight.w500,
                                        ),
                                        borderRadius: 25,
                                        onPressed: _handleLogin,
                                      ),
                                      const SizedBox(height: 10),
                                      CustomButton(
                                        text: '注册',
                                        height: 50,
                                        textColor: Colors.black87,
                                        textStyle: const TextStyle(
                                          fontSize: 16,
                                          fontWeight: FontWeight.w500,
                                        ),
                                        backgroundColor: Color(0xFFF3F4F8),
                                        borderRadius: 25,
                                        onPressed: () {
                                          pushPage(RegisterPage(), context);
                                        },
                                      ),
                                      const SizedBox(height: 20),
                                    ],
                                  ),
                                ),
                              ),

                              // 底部协议：固定在页面底部（不会被背景覆盖，因为在上层）
                              Padding(
                                padding: const EdgeInsets.symmetric(
                                  horizontal: 10,
                                  vertical: 10,
                                ),
                                child: Row(
                                  mainAxisAlignment: MainAxisAlignment.center,
                                  crossAxisAlignment: CrossAxisAlignment.center,
                                  children: [
                                    Checkbox(
                                      value: _agreed,
                                      activeColor: Colors.blue,
                                      checkColor: Colors.white,
                                      side: const BorderSide(color: Colors.grey),
                                      onChanged: (value) {
                                        setState(() {
                                          _agreed = value ?? false;
                                        });
                                      },
                                    ),
                                    Flexible(
                                      child: RichText(
                                        text: TextSpan(
                                          children: [
                                            const TextSpan(
                                              text: '我已阅读并同意',
                                              style: TextStyle(
                                                color: Colors.black,
                                                fontSize: 12,
                                              ),
                                            ),
                                            TextSpan(
                                              text: '《服务协议》',
                                              style: const TextStyle(
                                                color: Colors.blue,
                                                fontSize: 12,
                                              ),
                                              // 如果你用 recognizer，请替换为你之前的 recognizer 变量
                                              recognizer:
                                              TapGestureRecognizer()
                                                ..onTap = () {
                                                  pushPage(
                                                    const WebViewPage(
                                                      name: "用户服务协议",
                                                      url:
                                                      'http://47.92.102.56:7811/file/xieyi/zsyhxy.htm',
                                                    ),
                                                    context,
                                                  );
                                                },
                                            ),
                                            const TextSpan(
                                              text: '和',
                                              style: TextStyle(
                                                color: Colors.black,
                                                fontSize: 12,
                                              ),
                                            ),
                                            TextSpan(
                                              text: '《隐私政策》',
                                              style: const TextStyle(
                                                color: Colors.blue,
                                                fontSize: 12,
                                              ),
                                              recognizer:
                                              TapGestureRecognizer()
                                                ..onTap = () {
                                                  pushPage(
                                                    const WebViewPage(
                                                      name: "隐私政策",
                                                      url:
                                                      'http://47.92.102.56:7811/file/xieyi/zsysq.htm',
                                                    ),
                                                    context,
                                                  );
                                                },
                                            ),
                                          ],
                                        ),
                                      ),
                                    ),
                                  ],
                                ),
                              ),
                              const SizedBox(height: 10),
                            ],
                          ),
                        ),
                      ),
                    ),
                  ),
                ),
              ),
            ),
          ),
          // 交互层：放在背景之上

        ],
      ),
    );
  }

  Widget _remenbemberPWDAndRegister() {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 0),
      child: Row(
        children: [
          // 左侧：记住密码
          Expanded(
            child: InkWell(
              onTap:
                  () => setState(() => _rememberPassword = !_rememberPassword),
              child: Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Checkbox(
                    value: _rememberPassword,
                    onChanged:
                        (v) => setState(() => _rememberPassword = v ?? false),
                    activeColor: const Color(0xFF2A75F8),
                    side: const BorderSide(color: Colors.grey),
                    materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
                  ),
                  const Text(
                    '记住密码',
                    style: TextStyle(fontSize: 14, color: Colors.black38),
                  ),
                ],
              ),
            ),
          ),

          TextButton(
            onPressed: () {
              pushPage(ForgotPwdPage('0'), context);
            },
            child: const Text(
              '忘记密码？',
              style: TextStyle(fontSize: 14, color: Colors.black38),
            ),
          ),
        ],
      ),
    );
  }

  // 修改验证码图片构建方法
  Widget _buildCaptchaImage() {
    if (_captchaImageBase64.isEmpty) {
      return Container(
        width: 100,
        height: 40,
        decoration: BoxDecoration(
          color: Colors.black26,
          borderRadius: BorderRadius.circular(4),
        ),
        child: const Center(
          child: Text(
            '加载中...',
            style: TextStyle(color: Colors.grey, fontSize: 12),
          ),
        ),
      );
    }

    return GestureDetector(
      onTap: _getCaptcha,
      child: Container(
        width: 100,
        height: 40,
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(4),
        ),
        child: ClipRRect(
          borderRadius: BorderRadius.circular(4),
          child: Image.memory(
            base64.decode(_captchaImageBase64),
            fit: BoxFit.cover,
            errorBuilder: (context, error, stackTrace) {
              return const Center(
                child: Text(
                  '加载失败',
                  style: TextStyle(color: Colors.grey, fontSize: 12),
                ),
              );
            },
          ),
        ),
      ),
    );
  }

  Future<void> _handleLogin() async {
    if (_isLoading) {
      return;
    }
    if (!(_formKey.currentState?.validate() ?? false)) return;
    if (_codeController.text.isEmpty) {
      ToastUtil.showNormal(context, "请输入验证码");
      return;
    }
    if (!_agreed) {
      ToastUtil.showNormal(context, "请先阅读并同意《服务协议》和《隐私政策》");
      return;
    }

    // _phoneController.text='18700000002';
    // _passwordController.text='Aa@12345678';
    // _phoneController.text='卓云企业1';
    // _phoneController.text='ceshi36-220';
    // _passwordController.text='Aa12345678';
    final userName = _phoneController.text.trim();
    final userPwd = _passwordController.text.trim();

    _saveData(userName, userPwd);

    setState(() => _isLoading = true);

    Map params = {
      'captchaCode': _codeController.text,
      'captchaKey' : _captchaIdentifier,
    };
    LoadingDialogHelper.show();
    try {
      final data = await AuthService.login(params, userName, userPwd);
      LoadingDialogHelper.hide();
      _getCaptcha();
      setState(() => _isLoading = false);
      if (FormUtils.hasValue(data, 'success') &&
          data['success']) { // 登录成功直接进入主页
        Navigator.pushReplacement(
          context,
          MaterialPageRoute(
              builder: (_) => const MainPage(isChooseFirm: true,)),
        );
      } else {
        if (FormUtils.hasValue(data, 'isInfoComplete') &&
            data['isInfoComplete'] == false) { // 如果还没有用户信息。需要先完善
          Navigator.pushReplacement(
            context,
            MaterialPageRoute(
                builder: (_) => const FullUserinfoPage(isEidt: true, isChooseFirm: false,)),
          );
        } else if (FormUtils.hasValue(data, 'isChooseFirm') &&
            data['isChooseFirm'] == false) { // 多个企业，跳转选择
          { // 先不进行底座登录，选择企业
            List firmList = data['firmList'];
            if (firmList.isEmpty) {
              Navigator.pushReplacement(
                context,
                MaterialPageRoute(
                    builder: (_) => const MainPage(isChooseFirm: false,)),
              );
              return;
            }else{ // 跳转选择企业
              Navigator.pushReplacement(
                context,
                MaterialPageRoute(
                    builder: (_) => ChooseUserfirmPage(firms: firmList, userName: data['userName'], password: data['password'],)),
              );
            }

          }
        }
        if (data.isEmpty) {
          return;
        }
      }
    }catch (e) {
      setState(() => _isLoading = false);
      Fluttertoast.showToast(msg: '登录失败: $e');
    }
  }
}