import 'dart:io';

import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../features/events/services/events_service.dart';
import '../features/events/models/event_models.dart';
import 'learn_more_screen.dart';
import 'settings_screen.dart'; // <- added import
import '../core/app_decoration.dart';

class ProfileScreen extends StatefulWidget {
  const ProfileScreen({Key? key}) : super(key: key);

  @override
  State<ProfileScreen> createState() => _ProfileScreenState();
}

class _ProfileScreenState extends State<ProfileScreen> {
  String _username = '';
  String _email = 'not provided';
  String _profileImage = ''; // per-account stored path or URL (may be empty)
  final ImagePicker _picker = ImagePicker();

  final EventsService _eventsService = EventsService();

  // events coming from backend
  List<EventModel> _upcomingEvents = [];
  List<EventModel> _pastEvents = [];

  bool _loadingEvents = true;

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

  /// Load profile for the currently signed-in account.
  Future<void> _loadProfile() async {
    final prefs = await SharedPreferences.getInstance();
    // current_email marks the active account (set at login/register)
    final currentEmail = prefs.getString('current_email') ?? prefs.getString('email') ?? '';

    _email = currentEmail.isNotEmpty ? currentEmail : 'not provided';

    // per-account display name key
    final displayKey = currentEmail.isNotEmpty ? 'display_name_$currentEmail' : 'display_name';
    final profileImageKey = currentEmail.isNotEmpty ? 'profileImage_$currentEmail' : 'profileImage';

    // Prefer per-account display_name, else fallback to email
    _username = prefs.getString(displayKey) ?? prefs.getString('display_name') ?? _email;
    _profileImage = prefs.getString(profileImageKey) ?? prefs.getString('profileImage') ?? '';

    // load events for this account's pincode (or default)
    await _loadEventsForProfile(prefs);
    if (mounted) setState(() {});
  }

  Future<void> _loadEventsForProfile([SharedPreferences? prefs]) async {
    setState(() {
      _loadingEvents = true;
      _upcomingEvents = [];
      _pastEvents = [];
    });

    prefs ??= await SharedPreferences.getInstance();
    final pincode = prefs.getString('pincode') ?? 'all';

    try {
      final events = await _eventsService.getEventsByPincode(pincode);

      final now = DateTime.now();
      final upcoming = <EventModel>[];
      final past = <EventModel>[];

      DateTime? tryParseDate(String? s) {
        if (s == null) return null;
        try {
          return DateTime.tryParse(s);
        } catch (_) {
          return null;
        }
      }

      for (final e in events) {
        final parsed = tryParseDate(e.startDate);
        if (parsed == null) {
          upcoming.add(e);
        } else {
          if (parsed.isBefore(DateTime(now.year, now.month, now.day))) {
            past.add(e);
          } else {
            upcoming.add(e);
          }
        }
      }

      upcoming.sort((a, b) {
        final da = tryParseDate(a.startDate) ?? DateTime(9999);
        final db = tryParseDate(b.startDate) ?? DateTime(9999);
        return da.compareTo(db);
      });
      past.sort((a, b) {
        final da = tryParseDate(a.startDate) ?? DateTime(0);
        final db = tryParseDate(b.startDate) ?? DateTime(0);
        return db.compareTo(da);
      });

      if (mounted) {
        setState(() {
          _upcomingEvents = upcoming;
          _pastEvents = past;
        });
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Failed to load events: $e')));
      }
    } finally {
      if (mounted) setState(() => _loadingEvents = false);
    }
  }

  Future<void> _saveProfile(String name, String email, String profileImage) async {
    final prefs = await SharedPreferences.getInstance();
    final currentEmail = prefs.getString('current_email') ?? prefs.getString('email') ?? email;

    final displayKey = currentEmail.isNotEmpty ? 'display_name_$currentEmail' : 'display_name';
    final profileImageKey = currentEmail.isNotEmpty ? 'profileImage_$currentEmail' : 'profileImage';

    await prefs.setString(displayKey, name);
    await prefs.setString(profileImageKey, profileImage);

    // update 'email' canonical pointer and 'current_email' (defensive)
    await prefs.setString('email', currentEmail);
    await prefs.setString('current_email', currentEmail);

    setState(() {
      _username = name;
      _email = currentEmail.isNotEmpty ? currentEmail : 'not provided';
      _profileImage = profileImage;
    });
  }

  // ---------- Image picking / manual path ----------
  Future<void> _pickFromGallery() async {
    try {
      final XFile? xfile = await _picker.pickImage(source: ImageSource.gallery, imageQuality: 85);
      if (xfile == null) return;
      if (kIsWeb) {
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Use "Enter Asset Path" on web/desktop or add server URL.')));
        return;
      }
      final String path = xfile.path;
      await _saveProfile(_username, _email, path);
    } catch (e) {
      debugPrint('Image pick error: $e');
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Failed to pick image: $e')));
    }
  }

  Future<void> _enterAssetPathDialog() async {
    final ctl = TextEditingController(text: _profileImage);
    final result = await showDialog<String?>(
      context: context,
      builder: (ctx) {
        final theme = Theme.of(ctx);
        return AlertDialog(
          title: const Text('Enter image path or URL'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextField(
                controller: ctl,
                decoration: const InputDecoration(
                  labelText: 'Asset path (e.g. assets/images/profile.jpg) or URL',
                ),
              ),
              const SizedBox(height: 8),
              Text(
                'Use an asset path (for bundled images) or an https:// URL (web).',
                style: theme.textTheme.bodySmall?.copyWith(color: theme.hintColor),
              ),
            ],
          ),
          actions: [
            TextButton(onPressed: () => Navigator.of(ctx).pop(null), child: const Text('Cancel')),
            ElevatedButton(onPressed: () => Navigator.of(ctx).pop(ctl.text.trim()), child: const Text('Use')),
          ],
        );
      },
    );

    if (result == null || result.isEmpty) return;
    await _saveProfile(_username, _email, result);
  }

  Future<void> _openEditDialog() async {
    final nameCtl = TextEditingController(text: _username);
    final emailCtl = TextEditingController(text: _email);

    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: Colors.transparent,
      builder: (ctx) {
        final theme = Theme.of(ctx);
        return DraggableScrollableSheet(
          expand: false,
          initialChildSize: 0.44,
          minChildSize: 0.28,
          maxChildSize: 0.92,
          builder: (context, scrollController) {
            return Container(
              padding: const EdgeInsets.fromLTRB(18, 14, 18, 18),
              decoration: BoxDecoration(
                color: theme.cardColor,
                borderRadius: const BorderRadius.vertical(top: Radius.circular(20)),
              ),
              child: SingleChildScrollView(
                controller: scrollController,
                child: Column(
                  children: [
                    Container(width: 48, height: 6, decoration: BoxDecoration(color: theme.dividerColor, borderRadius: BorderRadius.circular(6))),
                    const SizedBox(height: 12),
                    Row(
                      children: [
                        Text('Edit profile', style: theme.textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
                        const Spacer(),
                        IconButton(
                          icon: const Icon(Icons.photo_camera),
                          onPressed: () async {
                            Navigator.of(context).pop(); // close sheet then launch picker to avoid nested modal issues
                            await _pickFromGallery();
                          },
                        ),
                        IconButton(
                          icon: const Icon(Icons.link),
                          onPressed: () {
                            Navigator.of(context).pop();
                            _enterAssetPathDialog();
                          },
                        ),
                      ],
                    ),
                    const SizedBox(height: 8),

                    TextField(controller: nameCtl, decoration: InputDecoration(labelText: 'Name', filled: true, fillColor: theme.cardColor, border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)))),
                    const SizedBox(height: 8),
                    TextField(controller: emailCtl, decoration: InputDecoration(labelText: 'Email', filled: true, fillColor: theme.cardColor, border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)))),
                    const SizedBox(height: 14),

                    Row(
                      children: [
                        const Spacer(),
                        TextButton(onPressed: () => Navigator.of(context).pop(), child: const Text('Cancel')),
                        const SizedBox(width: 8),
                        ElevatedButton(
                          onPressed: () async {
                            final newName = nameCtl.text.trim().isEmpty ? _email : nameCtl.text.trim();
                            final newEmail = emailCtl.text.trim().isEmpty ? _email : emailCtl.text.trim();

                            // If user changes email here (edge-case) we will treat newEmail as current account pointer.
                            await _saveProfile(newName, newEmail, _profileImage);
                            Navigator.of(context).pop();
                          },
                          child: const Text('Save'),
                        ),
                      ],
                    ),
                    const SizedBox(height: 8),
                    Text(
                      'Tip: tap the camera icon to pick from gallery (mobile). Or tap the link icon to paste an asset path or URL.',
                      style: theme.textTheme.bodySmall?.copyWith(color: theme.hintColor),
                    ),
                  ],
                ),
              ),
            );
          },
        );
      },
    );
  }

  // ---------- UI helpers ----------
  Widget _topIcon(IconData icon, {VoidCallback? onTap}) {
    final theme = Theme.of(context);
    return InkWell(
      onTap: onTap ?? () {},
      borderRadius: BorderRadius.circular(12),
      child: Container(
        width: 44,
        height: 44,
        decoration: BoxDecoration(color: theme.cardColor.withOpacity(0.6), borderRadius: BorderRadius.circular(12)),
        child: Icon(icon, color: theme.iconTheme.color),
      ),
    );
  }

  Widget _eventListTileFromModel(EventModel ev, {bool faded = false}) {
    final theme = Theme.of(context);
    final title = ev.title ?? ev.name ?? '';
    final dateLabel = (ev.startDate != null && ev.endDate != null && ev.startDate == ev.endDate)
        ? ev.startDate!
        : ((ev.startDate != null && ev.endDate != null) ? '${ev.startDate} - ${ev.endDate}' : (ev.startDate ?? ''));
    final location = ev.place ?? '';
    final imageUrl = (ev.thumbImg != null && ev.thumbImg!.isNotEmpty) ? ev.thumbImg! : (ev.images.isNotEmpty ? ev.images.first.image : null);

    final titleStyle = theme.textTheme.bodyLarge?.copyWith(fontWeight: FontWeight.w600, color: faded ? theme.hintColor : theme.textTheme.bodyLarge?.color);
    final subtitleStyle = theme.textTheme.bodySmall?.copyWith(fontSize: 13, color: faded ? theme.hintColor.withOpacity(0.7) : theme.hintColor);

    Widget leadingWidget() {
      if (imageUrl != null && imageUrl.trim().isNotEmpty) {
        if (imageUrl.startsWith('http')) {
          return ClipRRect(borderRadius: BorderRadius.circular(8), child: Image.network(imageUrl, width: 56, height: 56, fit: BoxFit.cover, errorBuilder: (_, __, ___) => Container(width: 56, height: 56, color: Theme.of(context).dividerColor, child: Icon(Icons.image, color: Theme.of(context).hintColor))));
        } else if (!kIsWeb) {
          final path = imageUrl;
          if (path.startsWith('/') || path.contains(Platform.pathSeparator)) {
            final file = File(path);
            if (file.existsSync()) {
              return ClipRRect(borderRadius: BorderRadius.circular(8), child: Image.file(file, width: 56, height: 56, fit: BoxFit.cover, errorBuilder: (_, __, ___) => Container(width: 56, height: 56, color: Theme.of(context).dividerColor, child: Icon(Icons.image, color: Theme.of(context).hintColor))));
            } else {
              return ClipRRect(borderRadius: BorderRadius.circular(8), child: Image.asset(imageUrl, width: 56, height: 56, fit: BoxFit.cover, errorBuilder: (_, __, ___) => Container(width: 56, height: 56, color: Theme.of(context).dividerColor, child: Icon(Icons.image, color: Theme.of(context).hintColor))));
            }
          } else {
            return ClipRRect(borderRadius: BorderRadius.circular(8), child: Image.asset(imageUrl, width: 56, height: 56, fit: BoxFit.cover, errorBuilder: (_, __, ___) => Container(width: 56, height: 56, color: Theme.of(context).dividerColor, child: Icon(Icons.image, color: Theme.of(context).hintColor))));
          }
        } else {
          return ClipRRect(borderRadius: BorderRadius.circular(8), child: Image.asset(imageUrl, width: 56, height: 56, fit: BoxFit.cover, errorBuilder: (_, __, ___) => Container(width: 56, height: 56, color: Theme.of(context).dividerColor, child: Icon(Icons.image, color: Theme.of(context).hintColor))));
        }
      }

      return Container(width: 56, height: 56, color: Theme.of(context).dividerColor, child: Icon(Icons.image, color: Theme.of(context).hintColor));
    }

    return Container(
      margin: const EdgeInsets.symmetric(vertical: 8),
      decoration: BoxDecoration(
        color: Theme.of(context).cardColor,
        borderRadius: BorderRadius.circular(14),
        boxShadow: [BoxShadow(color: Theme.of(context).shadowColor.withOpacity(0.06), blurRadius: 10, offset: const Offset(0, 6))],
      ),
      child: ListTile(
        onTap: () {
          if (ev.id != null) {
            Navigator.of(context).push(MaterialPageRoute(builder: (_) => LearnMoreScreen(eventId: ev.id)));
          }
        },
        contentPadding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        leading: ClipRRect(borderRadius: BorderRadius.circular(8), child: leadingWidget()),
        title: Text(title, style: titleStyle),
        subtitle: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const SizedBox(height: 6),
            Text(dateLabel, style: subtitleStyle),
            const SizedBox(height: 2),
            Text(location, style: subtitleStyle),
          ],
        ),
        trailing: Container(
          width: 40,
          height: 40,
          decoration: BoxDecoration(color: Theme.of(context).colorScheme.primary.withOpacity(0.12), borderRadius: BorderRadius.circular(10)),
          child: Icon(Icons.qr_code_scanner, color: Theme.of(context).colorScheme.primary),
        ),
      ),
    );
  }

  Widget _buildProfileAvatar() {
    final path = _profileImage.trim();
    if (path.startsWith('http')) {
      return ClipOval(child: Image.network(path, width: 96, height: 96, fit: BoxFit.cover, errorBuilder: (_, __, ___) => const Icon(Icons.person, size: 48, color: Colors.grey)));
    }
    if (kIsWeb) {
      return ClipOval(child: Image.asset(path.isNotEmpty ? path : 'assets/images/profile.jpg', width: 96, height: 96, fit: BoxFit.cover, errorBuilder: (_, __, ___) => const Icon(Icons.person, size: 48, color: Colors.grey)));
    }
    if (path.isNotEmpty && (path.startsWith('/') || path.contains(Platform.pathSeparator))) {
      final file = File(path);
      if (file.existsSync()) {
        return ClipOval(child: Image.file(file, width: 96, height: 96, fit: BoxFit.cover, errorBuilder: (_, __, ___) => const Icon(Icons.person, size: 48, color: Colors.grey)));
      } else {
        return ClipOval(child: Image.asset('assets/images/profile.jpg', width: 96, height: 96, fit: BoxFit.cover, errorBuilder: (_, __, ___) => const Icon(Icons.person, size: 48, color: Colors.grey)));
      }
    }
    return ClipOval(child: Image.asset('assets/images/profile.jpg', width: 96, height: 96, fit: BoxFit.cover, errorBuilder: (_, __, ___) => const Icon(Icons.person, size: 48, color: Colors.grey)));
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final gradient = const LinearGradient(colors: [Color(0xFF0B63D6), Color(0xFF1449B8)], begin: Alignment.topLeft, end: Alignment.bottomRight);

    return Scaffold(
      backgroundColor: theme.scaffoldBackgroundColor,
      body: Column(
        children: [
          Container(
            width: double.infinity,
            decoration: AppDecoration.blueGradient.copyWith(borderRadius: const BorderRadius.only(bottomLeft: Radius.circular(24), bottomRight: Radius.circular(24))),
            child: SafeArea(
              bottom: false,
              child: Padding(
                padding: const EdgeInsets.fromLTRB(20, 18, 20, 20),
                child: Column(
                  children: [
                    Row(
                      children: [
                        const Expanded(child: SizedBox()),
                        Text('Profile', style: theme.textTheme.titleMedium?.copyWith(color: Colors.white, fontWeight: FontWeight.w600)),
                        Expanded(
                          child: Row(
                            mainAxisAlignment: MainAxisAlignment.end,
                            children: [
                              GestureDetector(
                                onTap: () => _openEditDialog(),
                                child: Container(margin: const EdgeInsets.only(right: 10), width: 40, height: 40, decoration: BoxDecoration(color: Colors.white24, borderRadius: BorderRadius.circular(10)), child: const Icon(Icons.edit, color: Colors.white)),
                              ),
                              // <-- REPLACED the reminder icon with settings icon and navigation
                              GestureDetector(
                                onTap: () => Navigator.of(context).push(MaterialPageRoute(builder: (_) => const SettingsScreen())),
                                child: Container(width: 40, height: 40, decoration: BoxDecoration(color: Colors.white24, borderRadius: BorderRadius.circular(10)), child: const Icon(Icons.settings, color: Colors.white)),
                              ),
                            ],
                          ),
                        ),
                      ],
                    ),

                    const SizedBox(height: 18),

                    GestureDetector(
                      onTap: () => _openEditDialog(),
                      child: CircleAvatar(radius: 48, backgroundColor: Colors.white, child: _buildProfileAvatar()),
                    ),

                    const SizedBox(height: 12),
                    Text(_username, style: theme.textTheme.titleLarge?.copyWith(color: Colors.white, fontWeight: FontWeight.bold)),
                    const SizedBox(height: 6),
                    Container(padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6), decoration: BoxDecoration(color: Colors.white24, borderRadius: BorderRadius.circular(16)), child: Text(_email, style: const TextStyle(color: Colors.white70))),
                  ],
                ),
              ),
            ),
          ),

          Expanded(
            child: SingleChildScrollView(
              padding: const EdgeInsets.fromLTRB(18, 18, 18, 24),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  // Removed Upcoming Events section — kept only Past Events below

                  Text('Past Events', style: theme.textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
                  const SizedBox(height: 12),

                  if (_loadingEvents)
                    const SizedBox.shrink()
                  else if (_pastEvents.isEmpty)
                    Padding(
                      padding: const EdgeInsets.symmetric(vertical: 12),
                      child: Text('No past events', style: theme.textTheme.bodyMedium?.copyWith(color: theme.hintColor)),
                    )
                  else
                    Column(children: _pastEvents.map((e) => _eventListTileFromModel(e, faded: true)).toList()),

                  const SizedBox(height: 28),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}