import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../core/theme/evolution_theme_config.dart';
import '../../database/database.dart';
import '../../services/auth/auth_providers.dart';
import '../../services/auth/auth_state.dart';
import '../../services/auth/auth_user.dart';
import '../../services/sync/cloud_restore_controller.dart';
import '../../services/sync/sync_providers.dart';

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

  @override
  ConsumerState<AccountScreen> createState() => _AccountScreenState();
}

enum _AuthFormMode { signIn, register, forgotPassword }

class _DeleteAccountDialogResult {
  final String? password;

  const _DeleteAccountDialogResult({this.password});
}

class _AccountScreenState extends ConsumerState<AccountScreen> {
  final _formKey = GlobalKey<FormState>();
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  final _displayNameController = TextEditingController();

  _AuthFormMode _formMode = _AuthFormMode.signIn;
  bool _obscurePassword = true;
  bool _showAnonymousUpgrade = false;
  String? _statusMessage;

  @override
  void dispose() {
    debugPrint('[DELETE_FLOW] AccountScreen dispose');
    _emailController.dispose();
    _passwordController.dispose();
    _displayNameController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final authState = ref.watch(authNotifierProvider);
    final themeMode = ref.watch(dashboardThemeModeProvider);
    final isEvolution = themeMode == DashboardThemeMode.evolution;
    final isLandscape =
        MediaQuery.of(context).orientation == Orientation.landscape;

    final bgColor = isEvolution
        ? Colors.black
        : Theme.of(context).scaffoldBackgroundColor;
    final titleFont = isEvolution ? 'Sora' : null;

    return Scaffold(
      backgroundColor: bgColor,
      appBar: AppBar(
        backgroundColor: isEvolution ? Colors.transparent : null,
        elevation: 0,
        title: Text(
          'Account & Cloud Identity',
          style: TextStyle(
            fontFamily: titleFont,
            fontWeight: FontWeight.w800,
            fontSize: isLandscape ? 14 : 18,
          ),
        ),
      ),
      body: SafeArea(
        child: LayoutBuilder(
          builder: (context, constraints) {
            final isWide = constraints.maxWidth > 700;

            Widget content;
            if (authState.isAuthenticated) {
              content = _buildSignedInView(
                context,
                authState.user!,
                isEvolution,
                isWide,
              );
            } else if (authState.isAnonymous && !_showAnonymousUpgrade) {
              content = _buildAnonymousView(
                context,
                authState.user!,
                isEvolution,
                isWide,
              );
            } else {
              content = _buildSignedOutView(
                context,
                authState,
                isEvolution,
                isWide,
              );
            }

            return SingleChildScrollView(
              padding: const EdgeInsets.symmetric(
                horizontal: 16.0,
                vertical: 12.0,
              ),
              child: Center(
                child: ConstrainedBox(
                  constraints: BoxConstraints(
                    maxWidth: isWide ? 640 : double.infinity,
                  ),
                  child: content,
                ),
              ),
            );
          },
        ),
      ),
    );
  }

  Widget _buildSignedOutView(
    BuildContext context,
    AuthState authState,
    bool isEvolution,
    bool isWide,
  ) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        _buildOfflineNoticeCard(isEvolution, authState.isFirebaseConfigured),
        const SizedBox(height: 16),
        _buildAuthCard(
          isEvolution: isEvolution,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Row(
                children: [
                  Icon(
                    Icons.account_circle_outlined,
                    color: const Color(0xFF00E5FF),
                    size: 22,
                  ),
                  const SizedBox(width: 10),
                  Text(
                    _formMode == _AuthFormMode.signIn
                        ? 'SIGN IN TO MOTORCLOUD'
                        : (_formMode == _AuthFormMode.register
                              ? 'CREATE ACCOUNT'
                              : 'RESET PASSWORD'),
                    style: TextStyle(
                      fontFamily: isEvolution ? 'Sora' : null,
                      fontSize: 13,
                      fontWeight: FontWeight.w800,
                      color: const Color(0xFF00E5FF),
                      letterSpacing: 0.8,
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 8),
              Text(
                'Cloud sign-in is completely optional. All telemetry, HUD instruments, sensor fusion, and ride history are 100% functional without an account.',
                style: TextStyle(
                  fontFamily: isEvolution ? 'Inter' : null,
                  fontSize: 11,
                  color: Colors.white70,
                  height: 1.35,
                ),
              ),
              const SizedBox(height: 16),
              if (authState.hasError) ...[
                Container(
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    color: Colors.redAccent.withValues(alpha: 0.12),
                    borderRadius: BorderRadius.circular(8),
                    border: Border.all(
                      color: Colors.redAccent.withValues(alpha: 0.6),
                    ),
                  ),
                  child: Row(
                    children: [
                      const Icon(
                        Icons.error_outline,
                        color: Colors.redAccent,
                        size: 18,
                      ),
                      const SizedBox(width: 8),
                      Expanded(
                        child: Text(
                          authState.errorMessage!,
                          style: const TextStyle(
                            fontSize: 11,
                            color: Colors.redAccent,
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
                const SizedBox(height: 16),
              ],
              if (_statusMessage != null) ...[
                Container(
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    color: Colors.greenAccent.withValues(alpha: 0.12),
                    borderRadius: BorderRadius.circular(8),
                    border: Border.all(
                      color: Colors.greenAccent.withValues(alpha: 0.6),
                    ),
                  ),
                  child: Row(
                    children: [
                      const Icon(
                        Icons.check_circle_outline,
                        color: Colors.greenAccent,
                        size: 18,
                      ),
                      const SizedBox(width: 8),
                      Expanded(
                        child: Text(
                          _statusMessage!,
                          style: const TextStyle(
                            fontSize: 11,
                            color: Colors.greenAccent,
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
                const SizedBox(height: 16),
              ],
              if (_formMode != _AuthFormMode.forgotPassword) ...[
                ElevatedButton.icon(
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.white,
                    foregroundColor: Colors.black87,
                    padding: const EdgeInsets.symmetric(vertical: 12),
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(8),
                    ),
                  ),
                  icon: const Icon(
                    Icons.g_mobiledata,
                    size: 24,
                    color: Colors.redAccent,
                  ),
                  label: const Text(
                    'Continue with Google',
                    style: TextStyle(fontSize: 13, fontWeight: FontWeight.bold),
                  ),
                  onPressed: authState.isLoading
                      ? null
                      : () => _handleGoogleSignIn(),
                ),
                const SizedBox(height: 16),
                const Row(
                  children: [
                    Expanded(child: Divider(color: Colors.white24)),
                    Padding(
                      padding: EdgeInsets.symmetric(horizontal: 10),
                      child: Text(
                        'OR',
                        style: TextStyle(
                          color: Colors.white38,
                          fontSize: 10,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ),
                    Expanded(child: Divider(color: Colors.white24)),
                  ],
                ),
                const SizedBox(height: 16),
              ],
              Form(
                key: _formKey,
                child: Column(
                  children: [
                    if (_formMode == _AuthFormMode.register) ...[
                      TextFormField(
                        controller: _displayNameController,
                        decoration: InputDecoration(
                          labelText: 'Display Name (Optional)',
                          prefixIcon: const Icon(
                            Icons.person_outline,
                            size: 18,
                          ),
                          filled: true,
                          fillColor: isEvolution
                              ? const Color(0xFF141414)
                              : Colors.white10,
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(8),
                          ),
                          isDense: true,
                        ),
                        style: const TextStyle(fontSize: 13),
                      ),
                      const SizedBox(height: 12),
                    ],
                    TextFormField(
                      controller: _emailController,
                      keyboardType: TextInputType.emailAddress,
                      decoration: InputDecoration(
                        labelText: 'Email Address',
                        prefixIcon: const Icon(Icons.email_outlined, size: 18),
                        filled: true,
                        fillColor: isEvolution
                            ? const Color(0xFF141414)
                            : Colors.white10,
                        border: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(8),
                        ),
                        isDense: true,
                      ),
                      style: const TextStyle(fontSize: 13),
                      validator: (value) {
                        if (value == null || value.trim().isEmpty) {
                          return 'Please enter an email address';
                        }
                        if (!value.contains('@') || !value.contains('.')) {
                          return 'Please enter a valid email address';
                        }
                        return null;
                      },
                    ),
                    if (_formMode != _AuthFormMode.forgotPassword) ...[
                      const SizedBox(height: 12),
                      TextFormField(
                        controller: _passwordController,
                        obscureText: _obscurePassword,
                        decoration: InputDecoration(
                          labelText: 'Password',
                          prefixIcon: const Icon(Icons.lock_outline, size: 18),
                          suffixIcon: IconButton(
                            icon: Icon(
                              _obscurePassword
                                  ? Icons.visibility_off
                                  : Icons.visibility,
                              size: 18,
                              color: Colors.white54,
                            ),
                            onPressed: () => setState(
                              () => _obscurePassword = !_obscurePassword,
                            ),
                          ),
                          filled: true,
                          fillColor: isEvolution
                              ? const Color(0xFF141414)
                              : Colors.white10,
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(8),
                          ),
                          isDense: true,
                        ),
                        style: const TextStyle(fontSize: 13),
                        validator: (value) {
                          if (value == null || value.isEmpty) {
                            return 'Please enter your password';
                          }
                          if (_formMode == _AuthFormMode.register &&
                              value.length < 6) {
                            return 'Password must be at least 6 characters';
                          }
                          return null;
                        },
                      ),
                    ],
                  ],
                ),
              ),
              const SizedBox(height: 16),
              ElevatedButton(
                style: ElevatedButton.styleFrom(
                  backgroundColor: const Color(0xFF00E5FF),
                  foregroundColor: Colors.black,
                  padding: const EdgeInsets.symmetric(vertical: 12),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(8),
                  ),
                ),
                onPressed: authState.isLoading ? null : () => _submitForm(),
                child: authState.isLoading
                    ? const SizedBox(
                        width: 18,
                        height: 18,
                        child: CircularProgressIndicator(
                          strokeWidth: 2,
                          color: Colors.black,
                        ),
                      )
                    : Text(
                        _formMode == _AuthFormMode.signIn
                            ? 'SIGN IN'
                            : (_formMode == _AuthFormMode.register
                                  ? 'CREATE ACCOUNT'
                                  : 'SEND RESET LINK'),
                        style: const TextStyle(
                          fontWeight: FontWeight.w900,
                          letterSpacing: 0.8,
                        ),
                      ),
              ),
              const SizedBox(height: 12),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  if (_formMode == _AuthFormMode.signIn) ...[
                    TextButton(
                      onPressed: () => setState(() {
                        _formMode = _AuthFormMode.forgotPassword;
                        _statusMessage = null;
                      }),
                      child: const Text(
                        'Forgot Password?',
                        style: TextStyle(fontSize: 11, color: Colors.white70),
                      ),
                    ),
                    TextButton(
                      onPressed: () => setState(() {
                        _formMode = _AuthFormMode.register;
                        _statusMessage = null;
                      }),
                      child: const Text(
                        'Create Account',
                        style: TextStyle(
                          fontSize: 11,
                          color: Color(0xFF00E5FF),
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ),
                  ] else if (_formMode == _AuthFormMode.register) ...[
                    TextButton(
                      onPressed: () => setState(() {
                        _formMode = _AuthFormMode.signIn;
                        _statusMessage = null;
                      }),
                      child: const Text(
                        'Already have an account? Sign In',
                        style: TextStyle(
                          fontSize: 11,
                          color: Color(0xFF00E5FF),
                        ),
                      ),
                    ),
                  ] else ...[
                    TextButton(
                      onPressed: () => setState(() {
                        _formMode = _AuthFormMode.signIn;
                        _statusMessage = null;
                      }),
                      child: const Text(
                        'Back to Sign In',
                        style: TextStyle(fontSize: 11, color: Colors.white70),
                      ),
                    ),
                  ],
                ],
              ),
              const Divider(color: Colors.white12, height: 24),
              OutlinedButton.icon(
                style: OutlinedButton.styleFrom(
                  foregroundColor: Colors.white70,
                  side: const BorderSide(color: Colors.white24),
                  padding: const EdgeInsets.symmetric(vertical: 10),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(8),
                  ),
                ),
                icon: const Icon(Icons.person_outline, size: 18),
                label: const Text(
                  'Continue as Guest / Anonymous Rider',
                  style: TextStyle(fontSize: 11),
                ),
                onPressed: authState.isLoading
                    ? null
                    : () => ref
                          .read(authNotifierProvider.notifier)
                          .signInAnonymously(),
              ),
            ],
          ),
        ),
      ],
    );
  }

  Widget _buildSignedInView(
    BuildContext context,
    AuthUser user,
    bool isEvolution,
    bool isWide,
  ) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        _buildAuthCard(
          isEvolution: isEvolution,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  CircleAvatar(
                    radius: 28,
                    backgroundColor: const Color(
                      0xFF00E5FF,
                    ).withValues(alpha: 0.2),
                    backgroundImage: user.photoUrl != null
                        ? NetworkImage(user.photoUrl!)
                        : null,
                    child: user.photoUrl == null
                        ? const Icon(
                            Icons.person,
                            color: Color(0xFF00E5FF),
                            size: 32,
                          )
                        : null,
                  ),
                  const SizedBox(width: 16),
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          user.displayLabel,
                          style: TextStyle(
                            fontFamily: isEvolution ? 'Sora' : null,
                            fontSize: 18,
                            fontWeight: FontWeight.w800,
                            color: Colors.white,
                          ),
                        ),
                        const SizedBox(height: 2),
                        Text(
                          user.email ?? 'No email associated',
                          style: const TextStyle(
                            fontSize: 12,
                            color: Colors.white70,
                          ),
                        ),
                        const SizedBox(height: 6),
                        Container(
                          padding: const EdgeInsets.symmetric(
                            horizontal: 8,
                            vertical: 2,
                          ),
                          decoration: BoxDecoration(
                            color: const Color(
                              0xFF00E5FF,
                            ).withValues(alpha: 0.15),
                            borderRadius: BorderRadius.circular(4),
                            border: Border.all(
                              color: const Color(0xFF00E5FF),
                              width: 0.8,
                            ),
                          ),
                          child: Text(
                            'AUTHENTICATED (${user.providerId ?? "cloud"})',
                            style: const TextStyle(
                              fontFamily: 'Inter',
                              fontSize: 9,
                              fontWeight: FontWeight.w900,
                              color: Color(0xFF00E5FF),
                              letterSpacing: 0.5,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
              const Divider(height: 32, color: Colors.white12),
              _buildInfoRow('User ID', user.uid, isMonospace: true),
              if (user.providerId != null)
                _buildInfoRow('Provider', user.providerId!),
              if (user.createdAt != null)
                _buildInfoRow(
                  'Account Created',
                  user.createdAt!.toLocal().toString().split('.')[0],
                ),
              if (user.lastSignInTime != null)
                _buildInfoRow(
                  'Last Sign-In',
                  user.lastSignInTime!.toLocal().toString().split('.')[0],
                ),
              if (user.providerId == 'password' && !user.emailVerified) ...[
                const SizedBox(height: 12),
                Container(
                  padding: const EdgeInsets.all(10),
                  decoration: BoxDecoration(
                    color: Colors.amberAccent.withValues(alpha: 0.12),
                    borderRadius: BorderRadius.circular(8),
                    border: Border.all(color: Colors.amberAccent.withValues(alpha: 0.5)),
                  ),
                  child: Row(
                    children: [
                      const Expanded(child: Text('Your email is not verified. Verify it to protect account recovery.', style: TextStyle(fontSize: 11, color: Colors.white))),
                      TextButton(onPressed: () => _sendVerification(), child: const Text('VERIFY')),
                      IconButton(tooltip: 'Refresh verification status', onPressed: () => _reloadUser(), icon: const Icon(Icons.refresh, size: 18)),
                    ],
                  ),
                ),
              ],
              const SizedBox(height: 24),
              SizedBox(
                width: double.infinity,
                child: OutlinedButton.icon(
                  style: OutlinedButton.styleFrom(
                    foregroundColor: Colors.redAccent,
                    side: const BorderSide(color: Colors.redAccent),
                    padding: const EdgeInsets.symmetric(vertical: 12),
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(8),
                    ),
                  ),
                  icon: const Icon(Icons.logout, size: 18),
                  label: const Text(
                    'SIGN OUT',
                    style: TextStyle(
                      fontWeight: FontWeight.bold,
                      letterSpacing: 0.8,
                    ),
                  ),
                  onPressed: () =>
                      ref.read(authNotifierProvider.notifier).signOut(),
                ),
              ),
              const SizedBox(height: 10),
              SizedBox(
                width: double.infinity,
                child: TextButton.icon(
                  style: TextButton.styleFrom(foregroundColor: Colors.redAccent),
                  icon: const Icon(Icons.delete_forever_outlined, size: 18),
                  label: const Text('DELETE ACCOUNT'),
                  onPressed: () => _handleDeleteAccount(user),
                ),
              ),
            ],
          ),
        ),
        const SizedBox(height: 16),
        _buildCloudSyncSection(
          context: context,
          isEvolution: isEvolution,
          isAuthenticated: true,
        ),
        const SizedBox(height: 16),
        _buildLocalRidingActiveCard(isEvolution),
      ],
    );
  }

  Widget _buildAnonymousView(
    BuildContext context,
    AuthUser user,
    bool isEvolution,
    bool isWide,
  ) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        _buildAuthCard(
          isEvolution: isEvolution,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  CircleAvatar(
                    radius: 28,
                    backgroundColor: Colors.amberAccent.withValues(alpha: 0.2),
                    child: const Icon(
                      Icons.person_outline,
                      color: Colors.amberAccent,
                      size: 32,
                    ),
                  ),
                  const SizedBox(width: 16),
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          'Guest / Anonymous Rider',
                          style: TextStyle(
                            fontFamily: isEvolution ? 'Sora' : null,
                            fontSize: 17,
                            fontWeight: FontWeight.w800,
                            color: Colors.white,
                          ),
                        ),
                        const SizedBox(height: 4),
                        Container(
                          padding: const EdgeInsets.symmetric(
                            horizontal: 8,
                            vertical: 2,
                          ),
                          decoration: BoxDecoration(
                            color: Colors.amberAccent.withValues(alpha: 0.15),
                            borderRadius: BorderRadius.circular(4),
                            border: Border.all(
                              color: Colors.amberAccent,
                              width: 0.8,
                            ),
                          ),
                          child: const Text(
                            'OFFLINE GUEST SESSION',
                            style: TextStyle(
                              fontFamily: 'Inter',
                              fontSize: 9,
                              fontWeight: FontWeight.w900,
                              color: Colors.amberAccent,
                              letterSpacing: 0.5,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
              const Divider(height: 24, color: Colors.white12),
              _buildInfoRow('Session ID', user.uid, isMonospace: true),
              const SizedBox(height: 16),
              const Text(
                'You are currently using MotorSignal in local guest mode. All rides are stored locally in your SQLite database. You can link a full cloud account anytime.',
                style: TextStyle(
                  fontSize: 11,
                  color: Colors.white70,
                  height: 1.4,
                ),
              ),
              const SizedBox(height: 20),
              SizedBox(
                width: double.infinity,
                child: ElevatedButton.icon(
                  style: ElevatedButton.styleFrom(
                    backgroundColor: const Color(0xFF00E5FF),
                    foregroundColor: Colors.black,
                    padding: const EdgeInsets.symmetric(vertical: 12),
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(8),
                    ),
                  ),
                  icon: const Icon(Icons.link, size: 18),
                  label: const Text(
                    'SIGN IN WITH FULL ACCOUNT',
                    style: TextStyle(fontWeight: FontWeight.bold),
                  ),
                  onPressed: () => setState(() => _showAnonymousUpgrade = true),
                ),
              ),
            ],
          ),
        ),
        const SizedBox(height: 16),
        _buildCloudSyncSection(
          context: context,
          isEvolution: isEvolution,
          isAuthenticated: false,
        ),
        const SizedBox(height: 16),
        _buildLocalRidingActiveCard(isEvolution),
      ],
    );
  }

  Widget _buildCloudSyncSection({
    required BuildContext context,
    required bool isEvolution,
    required bool isAuthenticated,
  }) {
    final syncState = ref.watch(syncStateProvider);
    final syncManager = ref.watch(syncManagerProvider);
    final restoreState = ref.watch(cloudRestoreControllerProvider);
    final restoreController = ref.read(cloudRestoreControllerProvider.notifier);

    return _buildAuthCard(
      isEvolution: isEvolution,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Row(
                children: [
                  Icon(
                    Icons.cloud_sync_outlined,
                    color: isEvolution
                        ? const Color(0xFF00E5FF)
                        : Colors.blueAccent,
                    size: 20,
                  ),
                  const SizedBox(width: 8),
                  Text(
                    'MOTORCLOUD SYNC',
                    style: TextStyle(
                      fontFamily: isEvolution ? 'Sora' : null,
                      fontSize: 12,
                      fontWeight: FontWeight.w800,
                      color: isEvolution
                          ? const Color(0xFF00E5FF)
                          : Colors.white,
                      letterSpacing: 0.5,
                    ),
                  ),
                ],
              ),
              if (syncState.isProcessing)
                const Row(
                  children: [
                    SizedBox(
                      width: 12,
                      height: 12,
                      child: CircularProgressIndicator(
                        strokeWidth: 2,
                        color: Color(0xFF00E5FF),
                      ),
                    ),
                    SizedBox(width: 6),
                    Text(
                      'Syncing...',
                      style: TextStyle(fontSize: 10, color: Colors.white70),
                    ),
                  ],
                ),
            ],
          ),
          const SizedBox(height: 12),
          if (!isAuthenticated) ...[
            const Text(
              'Sign in to MotorCloud to back up eligible rides and restore them on another device. Local rides remain available on this device.',
              style: TextStyle(
                fontSize: 11,
                color: Colors.white70,
                height: 1.4,
              ),
            ),
          ] else ...[
            Container(
              padding: const EdgeInsets.all(12),
              decoration: BoxDecoration(
                color: Colors.white.withValues(alpha: 0.04),
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: Colors.white12),
              ),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: [
                  _buildSyncStatItem(
                    'Synced',
                    '${syncState.syncedCount}',
                    Colors.greenAccent,
                  ),
                  _buildSyncStatItem(
                    'Pending',
                    '${syncState.pendingCount}',
                    Colors.amberAccent,
                  ),
                  _buildSyncStatItem(
                    'Failed',
                    '${syncState.failedCount}',
                    Colors.redAccent,
                  ),
                ],
              ),
            ),
            const SizedBox(height: 12),
            if (syncState.failedCount > 0) ...[
              Container(
                padding: const EdgeInsets.symmetric(
                  horizontal: 10,
                  vertical: 6,
                ),
                decoration: BoxDecoration(
                  color: Colors.redAccent.withValues(alpha: 0.15),
                  borderRadius: BorderRadius.circular(6),
                  border: Border.all(
                    color: Colors.redAccent.withValues(alpha: 0.4),
                  ),
                ),
                child: Row(
                  children: [
                    const Icon(
                      Icons.warning_amber_rounded,
                      color: Colors.redAccent,
                      size: 16,
                    ),
                    const SizedBox(width: 8),
                    Expanded(
                      child: Text(
                        '${syncState.failedCount} ride(s) need attention. Tap Retry to process.',
                        style: const TextStyle(
                          fontSize: 11,
                          color: Colors.white,
                        ),
                      ),
                    ),
                    TextButton(
                      style: TextButton.styleFrom(
                        visualDensity: VisualDensity.compact,
                        foregroundColor: Colors.redAccent,
                      ),
                      onPressed: () => syncManager.retryAllPending(),
                      child: const Text(
                        'RETRY',
                        style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 11,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 12),
            ],
            _buildInfoRow(
              'Cloud Provider',
              'MotorCloud backup',
            ),
            if (syncState.lastSuccessfulSync != null)
              _buildInfoRow(
                'Last Successful Sync',
                syncState.lastSuccessfulSync!.toLocal().toString().split(
                  '.',
                )[0],
              ),
            if (syncState.lastError != null && syncState.failedCount > 0)
              _buildInfoRow('Last Sync Notice', syncState.lastError!),
            const SizedBox(height: 14),
            Row(
              children: [
                Expanded(
                  child: ElevatedButton.icon(
                    style: ElevatedButton.styleFrom(
                      backgroundColor: const Color(0xFF00E5FF),
                      foregroundColor: Colors.black,
                      padding: const EdgeInsets.symmetric(vertical: 10),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(8),
                      ),
                    ),
                    icon: syncState.isProcessing
                        ? const SizedBox(
                            width: 14,
                            height: 14,
                            child: CircularProgressIndicator(
                              strokeWidth: 2,
                              color: Colors.black,
                            ),
                          )
                        : const Icon(Icons.sync, size: 16),
                    label: Text(
                      syncState.isProcessing ? 'SYNCING...' : 'SYNC NOW',
                      style: const TextStyle(
                        fontSize: 11,
                        fontWeight: FontWeight.bold,
                        letterSpacing: 0.6,
                      ),
                    ),
                    onPressed: syncState.isProcessing
                        ? null
                        : () => syncManager.processQueue(),
                  ),
                ),
                const SizedBox(width: 8),
                Expanded(
                  child: OutlinedButton.icon(
                    style: OutlinedButton.styleFrom(
                      foregroundColor: Colors.white,
                      side: const BorderSide(color: Colors.white24),
                      padding: const EdgeInsets.symmetric(vertical: 10),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(8),
                      ),
                    ),
                    icon: const Icon(Icons.backup_outlined, size: 16),
                    label: const Text(
                      'BACK UP ALL',
                      style: TextStyle(
                        fontSize: 11,
                        fontWeight: FontWeight.bold,
                        letterSpacing: 0.6,
                      ),
                    ),
                    onPressed: () => _handleBackupAllHistoricalRides(),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 12),
            const Text(
              'Download your backed-up ride history and telemetry to this device.',
              style: TextStyle(
                fontSize: 11,
                color: Colors.white70,
                height: 1.35,
              ),
            ),
            const SizedBox(height: 10),
            SizedBox(
              width: double.infinity,
              child: OutlinedButton.icon(
                style: OutlinedButton.styleFrom(
                  foregroundColor: Colors.white,
                  side: const BorderSide(color: Colors.white24),
                  padding: const EdgeInsets.symmetric(vertical: 10),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(8),
                  ),
                ),
                icon: restoreState.isRestoring
                    ? const SizedBox(
                        width: 14,
                        height: 14,
                        child: CircularProgressIndicator(
                          strokeWidth: 2,
                          color: Colors.white,
                        ),
                      )
                    : const Icon(Icons.cloud_download_outlined, size: 16),
                label: Text(
                  restoreState.isRestoring
                      ? 'RESTORING...'
                      : 'RESTORE FROM MOTORCLOUD',
                  style: const TextStyle(
                    fontSize: 11,
                    fontWeight: FontWeight.bold,
                    letterSpacing: 0.6,
                  ),
                ),
                onPressed: (!isAuthenticated || restoreState.isRestoring)
                    ? null
                    : () => restoreController.restoreFromMotorCloud(),
              ),
            ),
            if (restoreState.message != null) ...[
              const SizedBox(height: 10),
              Container(
                padding: const EdgeInsets.symmetric(
                  horizontal: 10,
                  vertical: 8,
                ),
                decoration: BoxDecoration(
                  color: _restoreStatusColor(
                    restoreState.status,
                  ).withValues(alpha: 0.14),
                  borderRadius: BorderRadius.circular(6),
                  border: Border.all(
                    color: _restoreStatusColor(
                      restoreState.status,
                    ).withValues(alpha: 0.5),
                  ),
                ),
                child: Row(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Icon(
                      _restoreStatusIcon(restoreState.status),
                      size: 16,
                      color: _restoreStatusColor(restoreState.status),
                    ),
                    const SizedBox(width: 8),
                    Expanded(
                      child: Text(
                        restoreState.message!,
                        style: const TextStyle(
                          fontSize: 11,
                          color: Colors.white,
                          height: 1.3,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ],
        ],
      ),
    );
  }

  Widget _buildSyncStatItem(String label, String value, Color color) {
    return Column(
      children: [
        Text(
          value,
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.w900,
            color: color,
          ),
        ),
        const SizedBox(height: 2),
        Text(
          label.toUpperCase(),
          style: const TextStyle(
            fontSize: 9,
            fontWeight: FontWeight.w700,
            color: Colors.white60,
            letterSpacing: 0.5,
          ),
        ),
      ],
    );
  }

  Future<void> _sendVerification() async {
    try {
      await ref.read(authNotifierProvider.notifier).sendEmailVerification();
      if (mounted) ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Verification email sent.')));
    } catch (e) {
      if (mounted) ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Could not send verification email: $e')));
    }
  }

  Future<void> _reloadUser() async {
    try {
      await ref.read(authNotifierProvider.notifier).reloadCurrentUser();
    } catch (e) {
      if (mounted) ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Could not refresh account status: $e')));
    }
  }

  Future<void> _handleDeleteAccount(AuthUser user) async {
    debugPrint('[DELETE_FLOW] delete dialog opened');
    final controller = TextEditingController();
    final formKey = GlobalKey<FormState>();
    final result = await showDialog<_DeleteAccountDialogResult>(
      context: context,
      builder: (dialogContext) => AlertDialog(
        title: const Text('Delete Account'),
        content: Form(
          key: formKey,
          child: SingleChildScrollView(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const Text('Deleting your account will remove your MotorCloud backup data and account identity.'),
                const SizedBox(height: 12),
                const Text('Rides, telemetry/history, and garage data stored on this device will remain available.'),
                if (user.providerId == 'password') ...[
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: controller,
                    obscureText: true,
                    autofocus: true,
                    decoration: const InputDecoration(labelText: 'Current password'),
                    validator: (value) => value == null || value.isEmpty
                        ? 'Enter your current password'
                        : null,
                  ),
                ],
              ],
            ),
          ),
        ),
        actions: [
          TextButton(
            onPressed: () {
              Navigator.of(dialogContext).pop();
            },
            child: const Text('CANCEL'),
          ),
          FilledButton(
            onPressed: () {
              if (user.providerId == 'password' &&
                  !(formKey.currentState?.validate() ?? false)) {
                return;
              }
              debugPrint('[DELETE_FLOW] delete dialog submitted');
              Navigator.of(dialogContext).pop(
                _DeleteAccountDialogResult(
                  password: user.providerId == 'password'
                      ? controller.text
                      : null,
                ),
              );
            },
            child: const Text('DELETE ACCOUNT'),
          ),
        ],
      ),
    );
    controller.dispose();

    if (!mounted || result == null) {
      if (mounted) debugPrint('[DELETE_FLOW] delete dialog cancelled');
      return;
    }

    try {
      await ref.read(accountLifecycleServiceProvider).deleteAccount(password: result.password);
    } catch (e) {
      debugPrint('[DELETE_FLOW] deletion failure class=${e.runtimeType} mounted=$mounted');
      if (mounted) {
        ScaffoldMessenger.maybeOf(context)?.showSnackBar(
          const SnackBar(
            content: Text(
              'Account deletion could not be completed. Your account and local rides are unchanged.',
            ),
          ),
        );
      }
    }
  }

  Future<void> _handleBackupAllHistoricalRides() async {
    final db = ref.read(databaseProvider);
    final syncManager = ref.read(syncManagerProvider);
    final user = ref.read(currentUserProvider);
    if (user == null || user.isAnonymous) return;
    final rides = await db.select(db.rides).get();
    final owned = rides.where((ride) => ride.cloudOwnerUid == user.uid).toList();
    final unclaimed = rides.where((ride) => ride.cloudOwnerUid == null).toList();
    final otherOwned = rides.length - owned.length - unclaimed.length;
    var claimUnclaimed = false;
    if (unclaimed.isNotEmpty && mounted) {
      claimUnclaimed = await showDialog<bool>(
            context: context,
            builder: (context) => AlertDialog(
              title: const Text('Back Up Device Rides?'),
              content: Text(
                'This will associate ${unclaimed.length} device-local ride(s) with your signed-in MotorCloud account. Rides already associated with another account will not be included.',
              ),
              actions: [
                TextButton(onPressed: () => Navigator.pop(context, false), child: const Text('CANCEL')),
                FilledButton(onPressed: () => Navigator.pop(context, true), child: const Text('BACK UP')),
              ],
            ),
          ) ??
          false;
    }

    var enqueued = 0;
    if (claimUnclaimed) {
      for (final ride in unclaimed) {
        if (await db.claimRideForCloudOwner(ride.id, user.uid)) {
          await syncManager.enqueueRide(ride.id, autoProcess: false);
          enqueued++;
        }
      }
    }
    for (final ride in owned) {
      await syncManager.enqueueRide(ride.id, autoProcess: false);
      enqueued++;
    }

    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(
            'Queued $enqueued ride(s). Skipped $otherOwned ride(s) associated with another account.',
          ),
          duration: const Duration(seconds: 3),
        ),
      );
    }
    syncManager.processQueue();
  }

  Color _restoreStatusColor(CloudRestoreStatus status) {
    switch (status) {
      case CloudRestoreStatus.success:
        return Colors.greenAccent;
      case CloudRestoreStatus.partialFailure:
        return Colors.amberAccent;
      case CloudRestoreStatus.authRequired:
      case CloudRestoreStatus.unavailable:
      case CloudRestoreStatus.failure:
        return Colors.redAccent;
      case CloudRestoreStatus.idle:
      case CloudRestoreStatus.restoring:
        return const Color(0xFF00E5FF);
    }
  }

  IconData _restoreStatusIcon(CloudRestoreStatus status) {
    switch (status) {
      case CloudRestoreStatus.success:
        return Icons.check_circle_outline;
      case CloudRestoreStatus.partialFailure:
        return Icons.warning_amber_rounded;
      case CloudRestoreStatus.authRequired:
      case CloudRestoreStatus.unavailable:
      case CloudRestoreStatus.failure:
        return Icons.error_outline;
      case CloudRestoreStatus.idle:
      case CloudRestoreStatus.restoring:
        return Icons.cloud_sync_outlined;
    }
  }

  Widget _buildOfflineNoticeCard(bool isEvolution, bool isFirebaseConfigured) {
    return Container(
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: isEvolution ? const Color(0xFF0D0D0D) : const Color(0xFF1B2838),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(
          color: isFirebaseConfigured
              ? const Color(0xFF00E5FF).withValues(alpha: 0.3)
              : Colors.amberAccent.withValues(alpha: 0.4),
          width: 1.2,
        ),
      ),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Icon(
            isFirebaseConfigured
                ? Icons.cloud_done_outlined
                : Icons.offline_bolt_outlined,
            color: isFirebaseConfigured
                ? const Color(0xFF00E5FF)
                : Colors.amberAccent,
            size: 20,
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  isFirebaseConfigured
                      ? 'OFFLINE-FIRST ARCHITECTURE'
                      : 'STANDALONE OFFLINE MODE',
                  style: TextStyle(
                    fontFamily: isEvolution ? 'Sora' : null,
                    fontSize: 11,
                    fontWeight: FontWeight.w800,
                    color: isFirebaseConfigured
                        ? const Color(0xFF00E5FF)
                        : Colors.amberAccent,
                    letterSpacing: 0.6,
                  ),
                ),
                const SizedBox(height: 4),
                Text(
                  isFirebaseConfigured
                      ? 'Signing in enables optional multi-device account sync. Offline riding, telemetry acquisition, local SQLite persistence, and forensic exports are always available without an account.'
                      : 'MotorSignal is operating in local mode. All instruments, 20Hz sensor fusion, garage storage, and ride recordings remain 100% operational.',
                  style: const TextStyle(
                    fontSize: 11,
                    color: Colors.white70,
                    height: 1.35,
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildLocalRidingActiveCard(bool isEvolution) {
    return Container(
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: isEvolution ? const Color(0xFF0D0D0D) : const Color(0xFF141414),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: const Color(0xFF1F1F1F), width: 1.2),
      ),
      child: const Row(
        children: [
          Icon(Icons.shield_outlined, color: Colors.greenAccent, size: 20),
          SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  'LOCAL DATA ISOLATION ACTIVE',
                  style: TextStyle(
                    fontSize: 11,
                    fontWeight: FontWeight.w800,
                    color: Colors.greenAccent,
                    letterSpacing: 0.6,
                  ),
                ),
                SizedBox(height: 2),
                Text(
                  'Your local ride history remains available on this device. MotorCloud backup is optional and never required for recording or offline use.',
                  style: TextStyle(fontSize: 11, color: Colors.white60),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildAuthCard({required bool isEvolution, required Widget child}) {
    return Container(
      padding: const EdgeInsets.all(18),
      decoration: BoxDecoration(
        color: isEvolution ? const Color(0xFF0D0D0D) : null,
        borderRadius: BorderRadius.circular(14),
        border: Border.all(
          color: isEvolution ? const Color(0xFF1F1F1F) : Colors.white12,
          width: 1.2,
        ),
      ),
      child: child,
    );
  }

  Widget _buildInfoRow(String label, String value, {bool isMonospace = false}) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4.0),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(
            label,
            style: const TextStyle(fontSize: 11, color: Colors.white54),
          ),
          Flexible(
            child: Text(
              value,
              textAlign: TextAlign.end,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(
                fontFamily: isMonospace ? 'monospace' : null,
                fontSize: 11,
                fontWeight: FontWeight.w600,
                color: Colors.white,
              ),
            ),
          ),
        ],
      ),
    );
  }

  void _handleGoogleSignIn() {
    setState(() => _statusMessage = null);
    ref.read(authNotifierProvider.notifier).signInWithGoogle();
  }

  void _submitForm() async {
    if (_formKey.currentState?.validate() != true) return;
    setState(() => _statusMessage = null);

    final email = _emailController.text.trim();
    final password = _passwordController.text;
    final displayName = _displayNameController.text.trim();
    final notifier = ref.read(authNotifierProvider.notifier);

    if (_formMode == _AuthFormMode.signIn) {
      await notifier.signInWithEmailAndPassword(email, password);
    } else if (_formMode == _AuthFormMode.register) {
      await notifier.createUserWithEmailAndPassword(
        email,
        password,
        displayName: displayName.isNotEmpty ? displayName : null,
      );
    } else if (_formMode == _AuthFormMode.forgotPassword) {
      try {
        await notifier.sendPasswordResetEmail(email);
      } catch (_) {
        return;
      }
      if (mounted && !ref.read(authNotifierProvider).hasError) {
        setState(() {
        _statusMessage = 'Password reset instructions sent. Check your email.';
        });
      }
    }
  }
}