import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:em2rp/providers/user_provider.dart';
import 'package:em2rp/views/widgets/auth/mail_textfield.dart';
import 'package:em2rp/views/widgets/error_message.dart';
import 'package:em2rp/views/widgets/auth/forgot_password_button.dart';
import 'package:em2rp/views/widgets/image/big_image_left.dart';
import 'package:em2rp/views/widgets/auth/login_button.dart';
import 'package:em2rp/views/widgets/image/em2_logo_n_sur_b.dart';
import 'package:em2rp/views/widgets/auth/password_textfield.dart';
import 'package:em2rp/views/widgets/auth/welcome_text.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:em2rp/views/widgets/auth/forgot_password_dialog.dart';
import 'package:provider/provider.dart';

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

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  String _errorMessage = '';
  bool _isLoading = false;
  bool _obscurePassword = true;
  bool _highlightPasswordField = false;
  bool _highlightEmailField = false;

  @override
  void dispose() {
    _emailController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  Future<void> _signInWithEmailAndPassword() async {
    // Pas de vérification mounted ici, le widget reste monté pendant toute l'opération
    setState(() {
      _errorMessage = '';
      _isLoading = true;
      _highlightPasswordField = false;
      _highlightEmailField = false;
    });

    try {
      final UserCredential userCredential =
          await FirebaseAuth.instance.signInWithEmailAndPassword(
        email: _emailController.text.trim(),
        password: _passwordController.text,
      );
      final uid = userCredential.user!.uid;

      final DocumentSnapshot userDoc =
          await FirebaseFirestore.instance.collection('users').doc(uid).get();

      if (userDoc.exists) {
        print("User document found: ${userDoc.data()}");
        Provider.of<UserProvider>(context, listen: false)
            .setUserData(userDoc.data() as Map<String, dynamic>, uid);

        // Maintenant que toutes les données sont chargées, naviguer vers CalendarPage.
        Navigator.of(context).pushReplacementNamed('/calendar');
      } else {
        if (!mounted) return;
        setState(() {
          _errorMessage = "Aucune donnée utilisateur trouvée.";
          _isLoading = false;
        });
      }
    } on FirebaseAuthException catch (e) {
      if (!mounted) return;
      setState(() {
        _isLoading = false;
        if (e.code == 'user-not-found' || e.code == 'wrong-password') {
          _errorMessage = "Email ou mot de passe incorrect.";
          _highlightPasswordField = true;
          _highlightEmailField = true;
        } else {
          _errorMessage = "Erreur de connexion. Veuillez réessayer.";
        }
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _errorMessage =
            "Erreur lors de la récupération des données utilisateur.";
        _isLoading = false;
      });
    }
  }

  void _togglePasswordVisibility() {
    if (!mounted) return;
    setState(() {
      _obscurePassword = !_obscurePassword;
    });
  }

  void _forgotPassword() {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return const ForgotPasswordDialogWidget();
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: LayoutBuilder(
        builder: (context, constraints) {
          if (constraints.maxWidth > 900) {
            return _buildLargeScreenLayout(context);
          } else {
            return _buildSmallScreenLayout(context);
          }
        },
      ),
    );
  }

  Widget _buildLargeScreenLayout(BuildContext context) {
    return Row(
      children: <Widget>[
        Expanded(
          flex: 6,
          child: const BigLeftImageWidget(),
        ),
        Expanded(
          flex: 4,
          child: Padding(
            padding:
                const EdgeInsets.symmetric(horizontal: 50.0, vertical: 30.0),
            child: _buildLoginForm(context),
          ),
        ),
      ],
    );
  }

  Widget _buildSmallScreenLayout(BuildContext context) {
    return Center(
      child: SingleChildScrollView(
        padding: const EdgeInsets.all(20.0),
        child: _buildLoginForm(context),
      ),
    );
  }

  Widget _buildLoginForm(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: <Widget>[
        const LogoWidget(),
        const SizedBox(height: 30),
        const WelcomeTextWidget(),
        const SizedBox(height: 40),
        EmailTextFieldWidget(
          emailController: _emailController,
          highlightEmailField: _highlightEmailField,
        ),
        const SizedBox(height: 20),
        PasswordTextFieldWidget(
          passwordController: _passwordController,
          obscurePassword: _obscurePassword,
          highlightPasswordField: _highlightPasswordField,
          onTogglePasswordVisibility: _togglePasswordVisibility,
        ),
        ForgotPasswordButtonWidget(onPressed: _forgotPassword),
        const SizedBox(height: 30),
        LoginButtonWidget(
          isLoading: _isLoading,
          onPressed: _signInWithEmailAndPassword,
        ),
        const SizedBox(height: 20),
        ErrorMessageWidget(errorMessage: _errorMessage),
      ],
    );
  }
}