import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:real_estate_mobile/core/constants/app_colors.dart';
import 'package:real_estate_mobile/features/agents/data/models/agent_type.dart';
import 'package:real_estate_mobile/features/agents/presentation/providers/agents_provider.dart';
import 'package:real_estate_mobile/features/auth/presentation/providers/auth_provider.dart';
import 'package:real_estate_mobile/features/auth/presentation/widgets/auth_text_field.dart';
import 'package:real_estate_mobile/features/auth/presentation/widgets/or_divider.dart';
import 'package:real_estate_mobile/features/auth/presentation/widgets/role_toggle.dart';
import 'package:real_estate_mobile/features/auth/presentation/widgets/social_login_buttons.dart';
import 'package:go_router/go_router.dart';

class SignupScreen extends ConsumerStatefulWidget {
  const SignupScreen({super.key});

  @override
  ConsumerState<SignupScreen> createState() => _SignupScreenState();
}

class _SignupScreenState extends ConsumerState<SignupScreen> {
  final _nameController = TextEditingController();
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  String _selectedRole = 'USER';
  bool _obscurePassword = true;

  List<AgentType> _agentTypes = [];
  String? _selectedAgentTypeId;
  bool _loadingAgentTypes = false;

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

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

  Future<void> _fetchAgentTypes() async {
    setState(() => _loadingAgentTypes = true);
    try {
      final repo = ref.read(agentsRepositoryProvider);
      final types = await repo.getAgentTypes();
      if (mounted) {
        setState(() {
          _agentTypes = types;
          _loadingAgentTypes = false;
        });
      }
    } catch (_) {
      if (mounted) setState(() => _loadingAgentTypes = false);
    }
  }

  String? _validateLocally() {
    if (_nameController.text.trim().isEmpty) {
      return 'Please enter your name';
    }
    if (_emailController.text.trim().isEmpty) {
      return 'Please enter your email';
    }
    if (_passwordController.text.isEmpty) {
      return 'Please enter a password';
    }
    if (_selectedRole == 'AGENT' && (_selectedAgentTypeId == null || _selectedAgentTypeId!.isEmpty)) {
      return 'Please select an agent type';
    }
    return null;
  }

  void _handleSignup() {
    final localError = _validateLocally();
    if (localError != null) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(localError),
          behavior: SnackBarBehavior.floating,
        ),
      );
      return;
    }

    ref.read(authProvider.notifier).register(
          name: _nameController.text.trim(),
          email: _emailController.text.trim(),
          password: _passwordController.text,
          role: _selectedRole,
          agentTypeId: _selectedRole == 'AGENT' ? _selectedAgentTypeId : null,
        );
  }

  @override
  Widget build(BuildContext context) {
    final authState = ref.watch(authProvider);

    return Scaffold(
      body: Container(
        width: double.infinity,
        height: double.infinity,
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: [AppColors.gradientStart, AppColors.gradientEnd],
          ),
        ),
        child: SafeArea(
          child: SingleChildScrollView(
            padding: const EdgeInsets.symmetric(horizontal: 24),
            child: authState.registrationSuccess
                ? _buildSuccessContent(authState)
                : _buildFormContent(authState),
          ),
        ),
      ),
    );
  }

  Widget _buildSuccessContent(AuthState authState) {
    return Padding(
      padding: const EdgeInsets.only(top: 80),
      child: Container(
        padding: const EdgeInsets.all(32),
        decoration: BoxDecoration(
          color: AppColors.white,
          borderRadius: BorderRadius.circular(20),
        ),
        child: Column(
          children: [
            const Icon(
              Icons.check_circle_outline,
              size: 64,
              color: AppColors.success,
            ),
            const SizedBox(height: 24),
            const Text(
              'Check Your Email',
              style: TextStyle(
                fontFamily: 'Fractul',
                fontSize: 24,
                fontWeight: FontWeight.w400,
                color: AppColors.primaryDark,
              ),
            ),
            const SizedBox(height: 12),
            Text(
              'We\'ve sent a verification link to ',
              textAlign: TextAlign.center,
              style: TextStyle(
                fontFamily: 'Fractul',
                fontSize: 14,
                fontWeight: FontWeight.w300,
                color: AppColors.primaryDark.withValues(alpha: 0.7),
              ),
            ),
            Text(
              authState.registeredEmail,
              textAlign: TextAlign.center,
              style: const TextStyle(
                fontFamily: 'Fractul',
                fontSize: 14,
                fontWeight: FontWeight.w600,
                color: AppColors.primaryDark,
              ),
            ),
            const SizedBox(height: 4),
            Text(
              'Please check your inbox and click the link to verify your account before logging in.',
              textAlign: TextAlign.center,
              style: TextStyle(
                fontFamily: 'Fractul',
                fontSize: 14,
                fontWeight: FontWeight.w300,
                color: AppColors.primaryDark.withValues(alpha: 0.7),
              ),
            ),
            const SizedBox(height: 24),
            SizedBox(
              width: double.infinity,
              child: ElevatedButton(
                onPressed: () {
                  ref.read(authProvider.notifier).reset();
                  context.go('/login');
                },
                child: const Text('Go to Login'),
              ),
            ),
            const SizedBox(height: 16),
            Text(
              'Didn\'t receive the email? Check your spam folder or contact support.',
              textAlign: TextAlign.center,
              style: TextStyle(
                fontFamily: 'Fractul',
                fontSize: 12,
                fontWeight: FontWeight.w300,
                color: AppColors.primaryDark.withValues(alpha: 0.5),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildFormContent(AuthState authState) {
    final isLoading = authState.status == AuthStatus.loading;

    return Column(
      children: [
        const SizedBox(height: 40),

        // Logo
        Image.asset(
          'assets/icons/logo.png',
          width: 143,
          height: 41,
        ),
        const SizedBox(height: 24),

        // Title
        const Text(
          'Sign Up',
          style: TextStyle(
            fontFamily: 'Fractul',
            fontSize: 30,
            fontWeight: FontWeight.w400,
            color: AppColors.primaryDark,
          ),
        ),
        const SizedBox(height: 24),

        // Role toggle
        RoleToggle(
          selectedRole: _selectedRole,
          onChanged: (role) => setState(() {
            _selectedRole = role;
            if (role != 'AGENT') _selectedAgentTypeId = null;
          }),
        ),
        const SizedBox(height: 20),

        // Error banner
        if (authState.errorMessage != null &&
            authState.fieldErrors.isEmpty) ...[
          Container(
            width: double.infinity,
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
            decoration: BoxDecoration(
              color: AppColors.errorBg,
              border: Border.all(color: AppColors.errorBorder),
              borderRadius: BorderRadius.circular(20),
            ),
            child: Text(
              authState.errorMessage!,
              style: const TextStyle(
                fontFamily: 'Fractul',
                fontSize: 14,
                fontWeight: FontWeight.w300,
                color: AppColors.error,
              ),
            ),
          ),
          const SizedBox(height: 16),
        ],

        // Name field
        AuthTextField(
          hintText: 'Name',
          controller: _nameController,
          keyboardType: TextInputType.name,
          errorText: authState.getFieldError('firstName'),
        ),
        const SizedBox(height: 16),

        // Email field
        AuthTextField(
          hintText: 'Email',
          controller: _emailController,
          keyboardType: TextInputType.emailAddress,
          errorText: authState.getFieldError('email'),
        ),
        const SizedBox(height: 16),

        // Password field
        AuthTextField(
          hintText: 'Password',
          controller: _passwordController,
          obscureText: _obscurePassword,
          textInputAction: TextInputAction.done,
          errorText: authState.getFieldError('password'),
          suffixIcon: IconButton(
            icon: Icon(
              _obscurePassword ? Icons.visibility_off : Icons.visibility,
              color: AppColors.hintText,
              size: 22,
            ),
            onPressed: () =>
                setState(() => _obscurePassword = !_obscurePassword),
          ),
        ),
        Padding(
          padding: const EdgeInsets.only(top: 8, left: 8),
          child: Align(
            alignment: Alignment.centerLeft,
            child: Text(
              'Min 8 chars, 1 uppercase, 1 lowercase, 1 number, 1 special character',
              style: TextStyle(
                fontFamily: 'Fractul',
                fontSize: 12,
                fontWeight: FontWeight.w300,
                color: AppColors.primaryDark.withValues(alpha: 0.6),
              ),
            ),
          ),
        ),

        // Agent type selector (only when AGENT role is selected)
        if (_selectedRole == 'AGENT') ...[
          const SizedBox(height: 16),
          Container(
            height: 50,
            decoration: BoxDecoration(
              color: AppColors.white,
              borderRadius: BorderRadius.circular(20),
            ),
            padding: const EdgeInsets.symmetric(horizontal: 16),
            child: _loadingAgentTypes
                ? const Center(
                    child: SizedBox(
                      width: 20,
                      height: 20,
                      child: CircularProgressIndicator(
                        strokeWidth: 2,
                        color: AppColors.accentOrange,
                      ),
                    ),
                  )
                : DropdownButtonHideUnderline(
                    child: DropdownButton<String>(
                      value: _selectedAgentTypeId,
                      hint: Text(
                        'Select Agent Type',
                        style: TextStyle(
                          fontFamily: 'Fractul',
                          fontSize: 14,
                          fontWeight: FontWeight.w300,
                          color: AppColors.primaryDark.withValues(alpha: 0.5),
                        ),
                      ),
                      isExpanded: true,
                      icon: const Icon(
                        Icons.keyboard_arrow_down,
                        color: AppColors.primaryDark,
                        size: 22,
                      ),
                      style: const TextStyle(
                        fontFamily: 'Fractul',
                        fontSize: 14,
                        fontWeight: FontWeight.w400,
                        color: AppColors.primaryDark,
                      ),
                      items: _agentTypes
                          .map((type) => DropdownMenuItem<String>(
                                value: type.id,
                                child: Text(type.name),
                              ))
                          .toList(),
                      onChanged: (value) =>
                          setState(() => _selectedAgentTypeId = value),
                    ),
                  ),
          ),
          if (authState.getFieldError('agentTypeId') != null)
            Padding(
              padding: const EdgeInsets.only(top: 6, left: 12),
              child: Text(
                authState.getFieldError('agentTypeId')!,
                style: const TextStyle(
                  fontFamily: 'Fractul',
                  fontSize: 12,
                  color: AppColors.error,
                ),
              ),
            ),
        ],
        const SizedBox(height: 24),

        // Sign Up button
        SizedBox(
          width: double.infinity,
          child: ElevatedButton(
            onPressed: isLoading ? null : _handleSignup,
            child: isLoading
                ? const SizedBox(
                    height: 20,
                    width: 20,
                    child: CircularProgressIndicator(
                      strokeWidth: 2,
                      color: AppColors.primaryDark,
                    ),
                  )
                : const Text('Sign Up'),
          ),
        ),
        const SizedBox(height: 24),

        // Already have account
        Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text(
              'Already Have An Account ? ',
              style: TextStyle(
                fontFamily: 'Fractul',
                fontSize: 14,
                fontWeight: FontWeight.w300,
                color: AppColors.primaryDark,
              ),
            ),
            GestureDetector(
              onTap: () => context.go('/login'),
              child: const Text(
                'Login',
                style: TextStyle(
                  fontFamily: 'Fractul',
                  fontSize: 14,
                  fontWeight: FontWeight.w400,
                  color: AppColors.primaryDark,
                ),
              ),
            ),
          ],
        ),
        const SizedBox(height: 24),

        // Or divider
        const OrDivider(),
        const SizedBox(height: 24),

        // Social login buttons (signup mode with role and agent type)
        SocialLoginButtons(
          mode: 'signup',
          role: _selectedRole,
          agentTypeId: _selectedAgentTypeId,
        ),
        const SizedBox(height: 40),
      ],
    );
  }
}