import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../core/providers/auth_provider.dart';
import '../../core/theme/app_theme.dart';
import '../shared/location_picker_sheet.dart';
import '../shared/tenant_location_data.dart';
import 'onboarding_repository.dart';

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

  @override
  ConsumerState<OnboardingScreen> createState() => _OnboardingScreenState();
}

class _OnboardingScreenState extends ConsumerState<OnboardingScreen>
    with SingleTickerProviderStateMixin {
  final _formKey = GlobalKey<FormState>();
  final _nameCtrl = TextEditingController();
  String _selectedKind = 'clinic';
  TenantLocationData? _location;
  bool _loading = false;
  String? _error;
  late AnimationController _animCtrl;
  late Animation<double> _fadeAnim;
  late Animation<Offset> _slideAnim;

  @override
  void initState() {
    super.initState();
    _animCtrl = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 600),
    );
    _fadeAnim = CurvedAnimation(parent: _animCtrl, curve: Curves.easeOut);
    _slideAnim = Tween<Offset>(
      begin: const Offset(0, 0.08),
      end: Offset.zero,
    ).animate(CurvedAnimation(parent: _animCtrl, curve: Curves.easeOutCubic));
    _animCtrl.forward();
  }

  @override
  void dispose() {
    _animCtrl.dispose();
    _nameCtrl.dispose();
    super.dispose();
  }

  Future<void> _create() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() {
      _loading = true;
      _error = null;
    });
    try {
      final result = await OnboardingRepository.instance.createTenantAndJoin(
        kind: _selectedKind,
        companyName: _nameCtrl.text.trim(),
        companyAddress: _location?.address,
        city: _location?.city,
        district: _location?.district,
        latitude: _location?.latitude,
        longitude: _location?.longitude,
      );
      if (!mounted) return;
      ref.read(authProvider.notifier).setActiveTenant(result.tenants.first);
    } catch (e) {
      setState(() {
        _error = 'Hesap oluşturulamadı. Lütfen tekrar deneyin.';
        _loading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final size = MediaQuery.sizeOf(context);

    return Scaffold(
      backgroundColor: const Color(0xFF4F46E5),
      body: Stack(
        children: [
          // ── Gradient background ──────────────────────────────────────────
          Container(
            decoration: const BoxDecoration(
              gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomCenter,
                colors: [Color(0xFF3730A3), Color(0xFF6366F1)],
              ),
            ),
          ),

          // ── Decorative circles ───────────────────────────────────────────
          Positioned(
            top: -40,
            right: -60,
            child: Container(
              width: 220,
              height: 220,
              decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: Colors.white.withValues(alpha: 0.06),
              ),
            ),
          ),
          Positioned(
            top: 80,
            left: -70,
            child: Container(
              width: 200,
              height: 200,
              decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: Colors.white.withValues(alpha: 0.04),
              ),
            ),
          ),

          // ── Content ──────────────────────────────────────────────────────
          Column(
            children: [
              // Header
              SafeArea(
                bottom: false,
                child: SizedBox(
                  height: size.height * 0.26,
                  child: Stack(
                    children: [
                      // Sign out
                      Positioned(
                        right: 8,
                        top: 4,
                        child: TextButton.icon(
                          onPressed: () =>
                              ref.read(authProvider.notifier).signOut(),
                          icon: const Icon(Icons.logout_rounded,
                              color: Colors.white70, size: 18),
                          label: const Text(
                            'Çıkış',
                            style: TextStyle(color: Colors.white70),
                          ),
                        ),
                      ),
                      Center(
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Container(
                              width: 68,
                              height: 68,
                              decoration: BoxDecoration(
                                color: Colors.white.withValues(alpha: 0.15),
                                borderRadius: BorderRadius.circular(20),
                                border: Border.all(
                                  color: Colors.white.withValues(alpha: 0.3),
                                  width: 1.5,
                                ),
                              ),
                              child: const Icon(
                                Icons.domain_add_rounded,
                                size: 32,
                                color: Colors.white,
                              ),
                            ),
                            const SizedBox(height: 14),
                            const Text(
                              'Kurumunuzu Oluşturun',
                              style: TextStyle(
                                color: Colors.white,
                                fontSize: 20,
                                fontWeight: FontWeight.w700,
                                letterSpacing: 0.3,
                              ),
                            ),
                            const SizedBox(height: 4),
                            Text(
                              'Klinik veya laboratuvar olarak kayıt olun',
                              style: TextStyle(
                                color: Colors.white.withValues(alpha: 0.70),
                                fontSize: 13,
                              ),
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                ),
              ),

              // Form card
              Expanded(
                child: FadeTransition(
                  opacity: _fadeAnim,
                  child: SlideTransition(
                    position: _slideAnim,
                    child: Container(
                      decoration: BoxDecoration(
                        color: cs.surface,
                        borderRadius: const BorderRadius.vertical(
                          top: Radius.circular(32),
                        ),
                        boxShadow: [
                          BoxShadow(
                            color: Colors.black.withValues(alpha: 0.15),
                            blurRadius: 24,
                            offset: const Offset(0, -4),
                          ),
                        ],
                      ),
                      child: SingleChildScrollView(
                        padding: const EdgeInsets.fromLTRB(28, 32, 28, 24),
                        child: Form(
                          key: _formKey,
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.stretch,
                            children: [
                              Text(
                                'Kurum Türünü Seçin',
                                style: Theme.of(context)
                                    .textTheme
                                    .titleMedium
                                    ?.copyWith(fontWeight: FontWeight.w600),
                              ),
                              const SizedBox(height: 14),

                              // Kind cards
                              Row(
                                children: [
                                  Expanded(
                                    child: _KindCard(
                                      icon: Icons.local_hospital_outlined,
                                      label: 'Klinik',
                                      description: 'Diş kliniği',
                                      value: 'clinic',
                                      selected: _selectedKind == 'clinic',
                                      onTap: () => setState(
                                          () => _selectedKind = 'clinic'),
                                    ),
                                  ),
                                  const SizedBox(width: 12),
                                  Expanded(
                                    child: _KindCard(
                                      icon: Icons.science_outlined,
                                      label: 'Laboratuvar',
                                      description: 'Diş laboratuvarı',
                                      value: 'lab',
                                      selected: _selectedKind == 'lab',
                                      onTap: () =>
                                          setState(() => _selectedKind = 'lab'),
                                    ),
                                  ),
                                ],
                              ),

                              const SizedBox(height: 24),

                              Text(
                                'Konum',
                                style: Theme.of(context)
                                    .textTheme
                                    .titleMedium
                                    ?.copyWith(fontWeight: FontWeight.w600),
                              ),
                              const SizedBox(height: 10),
                              Container(
                                padding: const EdgeInsets.all(14),
                                decoration: BoxDecoration(
                                  color: cs.surfaceContainerHighest,
                                  borderRadius: BorderRadius.circular(14),
                                ),
                                child: Column(
                                  crossAxisAlignment: CrossAxisAlignment.start,
                                  children: [
                                    Text(
                                      _location?.fullLabel.isNotEmpty == true
                                          ? _location!.fullLabel
                                          : 'Konumu haritadan seçin. Laboratuvar aramalarında bu veri kullanılacak.',
                                      style: TextStyle(
                                        fontSize: 13,
                                        color: _location == null
                                            ? cs.onSurfaceVariant
                                            : cs.onSurface,
                                      ),
                                    ),
                                    if (_location?.hasCoordinates == true) ...[
                                      const SizedBox(height: 8),
                                      Text(
                                        '${_location!.latitude!.toStringAsFixed(6)}, ${_location!.longitude!.toStringAsFixed(6)}',
                                        style: const TextStyle(
                                          fontSize: 12,
                                          color: AppColors.textMuted,
                                        ),
                                      ),
                                    ],
                                    const SizedBox(height: 12),
                                    OutlinedButton.icon(
                                      onPressed: () async {
                                        final picked =
                                            await showLocationPickerSheet(
                                          context,
                                          initialLocation: _location,
                                          title: _selectedKind == 'lab'
                                              ? 'Laboratuvar Konumu'
                                              : 'Klinik Konumu',
                                        );
                                        if (picked != null) {
                                          setState(() => _location = picked);
                                        }
                                      },
                                      icon: const Icon(Icons.map_outlined),
                                      label: Text(_location == null
                                          ? 'Haritadan Seç'
                                          : 'Konumu Güncelle'),
                                    ),
                                  ],
                                ),
                              ),

                              const SizedBox(height: 24),

                              // Company name
                              Text(
                                'Kurum Adı',
                                style: Theme.of(context)
                                    .textTheme
                                    .titleMedium
                                    ?.copyWith(fontWeight: FontWeight.w600),
                              ),
                              const SizedBox(height: 10),
                              TextFormField(
                                controller: _nameCtrl,
                                textInputAction: TextInputAction.done,
                                textCapitalization: TextCapitalization.words,
                                onFieldSubmitted: (_) => _create(),
                                decoration: InputDecoration(
                                  labelText: _selectedKind == 'clinic'
                                      ? 'Klinik Adı'
                                      : 'Laboratuvar Adı',
                                  prefixIcon: const Icon(
                                      Icons.business_outlined,
                                      size: 20),
                                  filled: true,
                                  fillColor: cs.surfaceContainerHighest,
                                  border: OutlineInputBorder(
                                    borderRadius: BorderRadius.circular(14),
                                    borderSide: BorderSide.none,
                                  ),
                                  enabledBorder: OutlineInputBorder(
                                    borderRadius: BorderRadius.circular(14),
                                    borderSide: BorderSide.none,
                                  ),
                                  focusedBorder: OutlineInputBorder(
                                    borderRadius: BorderRadius.circular(14),
                                    borderSide: const BorderSide(
                                        color: Color(0xFF4F46E5), width: 2),
                                  ),
                                  errorBorder: OutlineInputBorder(
                                    borderRadius: BorderRadius.circular(14),
                                    borderSide:
                                        BorderSide(color: cs.error, width: 1.5),
                                  ),
                                  focusedErrorBorder: OutlineInputBorder(
                                    borderRadius: BorderRadius.circular(14),
                                    borderSide:
                                        BorderSide(color: cs.error, width: 2),
                                  ),
                                  contentPadding: const EdgeInsets.symmetric(
                                      horizontal: 16, vertical: 16),
                                ),
                                validator: (v) {
                                  if (v == null || v.trim().isEmpty) {
                                    return 'Kurum adı gereklidir';
                                  }
                                  if (v.trim().length < 3) {
                                    return 'En az 3 karakter olmalıdır';
                                  }
                                  return null;
                                },
                              ),

                              // Error banner
                              if (_error != null) ...[
                                const SizedBox(height: 14),
                                Container(
                                  padding: const EdgeInsets.symmetric(
                                      horizontal: 14, vertical: 10),
                                  decoration: BoxDecoration(
                                    color: cs.errorContainer,
                                    borderRadius: BorderRadius.circular(12),
                                  ),
                                  child: Row(
                                    children: [
                                      Icon(Icons.error_outline_rounded,
                                          color: cs.onErrorContainer, size: 18),
                                      const SizedBox(width: 8),
                                      Expanded(
                                        child: Text(
                                          _error!,
                                          style: TextStyle(
                                              color: cs.onErrorContainer,
                                              fontSize: 13),
                                        ),
                                      ),
                                    ],
                                  ),
                                ),
                              ],

                              const SizedBox(height: 28),

                              FilledButton(
                                onPressed: _loading || _location == null
                                    ? null
                                    : _create,
                                style: FilledButton.styleFrom(
                                  minimumSize: const Size.fromHeight(52),
                                  shape: RoundedRectangleBorder(
                                    borderRadius: BorderRadius.circular(14),
                                  ),
                                  backgroundColor: const Color(0xFF4F46E5),
                                ),
                                child: _loading
                                    ? const SizedBox(
                                        height: 22,
                                        width: 22,
                                        child: CircularProgressIndicator(
                                          strokeWidth: 2.5,
                                          color: Colors.white,
                                        ),
                                      )
                                    : const Text(
                                        'Devam Et',
                                        style: TextStyle(
                                          fontSize: 16,
                                          fontWeight: FontWeight.w600,
                                        ),
                                      ),
                              ),
                            ],
                          ),
                        ),
                      ),
                    ),
                  ),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}

class _KindCard extends StatelessWidget {
  const _KindCard({
    required this.icon,
    required this.label,
    required this.description,
    required this.value,
    required this.selected,
    required this.onTap,
  });

  final IconData icon;
  final String label;
  final String description;
  final String value;
  final bool selected;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(16),
      child: AnimatedContainer(
        duration: const Duration(milliseconds: 180),
        padding: const EdgeInsets.symmetric(vertical: 20, horizontal: 12),
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(16),
          border: Border.all(
            color: selected ? const Color(0xFF4F46E5) : cs.outlineVariant,
            width: selected ? 2 : 1,
          ),
          color: selected
              ? const Color(0xFF4F46E5).withValues(alpha: 0.08)
              : cs.surfaceContainerLow,
        ),
        child: Column(
          children: [
            Container(
              width: 48,
              height: 48,
              decoration: BoxDecoration(
                color: selected
                    ? const Color(0xFF4F46E5).withValues(alpha: 0.12)
                    : cs.surfaceContainerHighest,
                borderRadius: BorderRadius.circular(12),
              ),
              child: Icon(
                icon,
                size: 26,
                color: selected ? const Color(0xFF4F46E5) : cs.onSurfaceVariant,
              ),
            ),
            const SizedBox(height: 10),
            Text(
              label,
              style: TextStyle(
                fontWeight: FontWeight.w600,
                fontSize: 14,
                color: selected ? const Color(0xFF4F46E5) : cs.onSurface,
              ),
            ),
            const SizedBox(height: 2),
            Text(
              description,
              style: TextStyle(
                fontSize: 11,
                color: cs.onSurfaceVariant,
              ),
            ),
          ],
        ),
      ),
    );
  }
}