import 'dart:io';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:url_launcher/url_launcher.dart';

import '../../../../models/contact.dart';
import '../../../../services/contact_service.dart';
import '../../../../services/permission_service.dart';
import '../controllers/contacts_controller.dart';
import 'contact_edit_view.dart';

/// Kapcsolatok lista — csak bejelentkezett ÉS jogosult felhasználóknak.
///
/// A jogosultság-ellenőrzés kétszintű: a UI a PermissionService-szel
/// elrejti/tiltja az oldalt (barátságos üzenet), a tényleges védelmet
/// pedig a Supabase-oldali RLS adja (az RLS-elutasítás is kezelt).
class ContactsView extends StatelessWidget {
  const ContactsView({super.key});

  @override
  Widget build(BuildContext context) {
    // Jogosultság-kapu — ha nincs joga, be sem töltjük a listát.
    if (Get.isRegistered<PermissionService>() &&
        !PermissionService.to.canContacts) {
      return Scaffold(
        appBar: AppBar(title: const Text('Kapcsolatok')),
        body: const _NoAccess(),
      );
    }

    final c = Get.put(ContactsController());

    return Scaffold(
      appBar: AppBar(
        title: const Text('Kapcsolatok'),
        actions: [
          IconButton(
            icon: const Icon(Icons.upload_file),
            tooltip: 'Import CSV',
            onPressed: () => _importCsv(c),
          ),
          IconButton(
            icon: const Icon(Icons.refresh),
            tooltip: 'Frissítés',
            onPressed: c.load,
          ),
          Obx(() => c.pendingCount.value == 0
              ? const SizedBox.shrink()
              : IconButton(
                  icon: Badge(
                    label: Text('${c.pendingCount.value}'),
                    child: const Icon(Icons.cloud_upload_outlined),
                  ),
                  tooltip: 'Várólista feltöltése',
                  onPressed: c.flushNow,
                ))
        ],
      ),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: () async {
          final saved = await Get.to(() => const ContactEditView());
          if (saved is Contact) c.load();
        },
        icon: const Icon(Icons.person_add_alt),
        label: const Text('Új'),
      ),
      body: Column(
        children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(12, 8, 12, 4),
            child: TextField(
              decoration: const InputDecoration(
                hintText: 'Keresés név, telefon, e-mail…',
                prefixIcon: Icon(Icons.search),
                isDense: true,
                border: OutlineInputBorder(),
              ),
              onChanged: (v) => c.search.value = v,
            ),
          ),
          Expanded(
            child: Obx(() {
              if (c.isLoading.value) {
                return const Center(child: CircularProgressIndicator());
              }
              if (c.error.value.isNotEmpty) {
                return _ErrorState(message: c.error.value, onRetry: c.load);
              }
              final rows = c.filtered;
              if (rows.isEmpty) {
                return const Center(
                    child: Text('Nincs megjeleníthető kapcsolat.'));
              }
              return ListView.separated(
                itemCount: rows.length,
                separatorBuilder: (_, __) => const Divider(height: 1),
                itemBuilder: (_, i) => _ContactTile(
                  item: rows[i],
                  onEdit: () async {
                    final saved = await Get.to(() => const ContactEditView(),
                        arguments: rows[i].contact);
                    if (saved != null) c.load();
                  },
                  onDelete: () => _confirmDelete(c, rows[i]),
                ),
              );
            }),
          ),
        ],
      ),
    );
  }

  Future<void> _confirmDelete(
      ContactsController c, ContactWithState item) async {
    final ok = await Get.dialog<bool>(AlertDialog(
      title: const Text('Törlés'),
      content: Text('Biztosan törlöd: ${item.contact.name}?'),
      actions: [
        TextButton(
            onPressed: () => Get.back(result: false),
            child: const Text('Mégse')),
        FilledButton(
            onPressed: () => Get.back(result: true),
            child: const Text('Törlés')),
      ],
    ));
    if (ok == true) await c.delete(item);
  }

  Future<void> _importCsv(ContactsController c) async {
    try {
      final result = await FilePicker.platform.pickFiles(type: FileType.any);
      final picked = result?.files.single;
      final path = picked?.path;
      if (path == null) return;

      final name = picked!.name.toLowerCase();
      if (!(name.endsWith('.csv') || name.endsWith('.txt'))) {
        Get.snackbar('Import', 'CSV vagy TXT fájlt válassz.',
            snackPosition: SnackPosition.BOTTOM);
        return;
      }

      final parsed = await ContactService.parseCsv(File(path));
      if (parsed.isEmpty) {
        Get.snackbar('Import', 'Nem található érvényes sor a fájlban.',
            snackPosition: SnackPosition.BOTTOM);
        return;
      }

      final ok = await Get.dialog<bool>(AlertDialog(
        title: const Text('Import megerősítése'),
        content: Text('${parsed.length} kapcsolat importálása?\n\n'
            'Első néhány: '
            '${parsed.take(3).map((e) => e.name).join(', ')}…'),
        actions: [
          TextButton(
              onPressed: () => Get.back(result: false),
              child: const Text('Mégse')),
          FilledButton(
              onPressed: () => Get.back(result: true),
              child: const Text('Import')),
        ],
      ));
      if (ok != true) return;

      final inserted = await ContactService.to.importMany(parsed);
      await c.load();
      Get.snackbar('Import kész', '$inserted kapcsolat importálva.',
          snackPosition: SnackPosition.BOTTOM);
    } catch (e) {
      Get.snackbar('Import hiba', e.toString(),
          snackPosition: SnackPosition.BOTTOM);
    }
  }
}

// ── Sor ──────────────────────────────────────────────────────────────

class _ContactTile extends StatelessWidget {
  final ContactWithState item;
  final VoidCallback onEdit;
  final VoidCallback onDelete;
  const _ContactTile(
      {required this.item, required this.onEdit, required this.onDelete});

  Contact get contact => item.contact;

  @override
  Widget build(BuildContext context) {
    final subtitle = [
      if (contact.phone.isNotEmpty) contact.phone,
      if (contact.email.isNotEmpty) contact.email,
    ].join(' · ');

    return ListTile(
      leading: CircleAvatar(
        child:
            Text(contact.name.isNotEmpty ? contact.name[0].toUpperCase() : '?'),
      ),
      title: Text(contact.name),
      subtitle: subtitle.isEmpty ? null : Text(subtitle),
      onTap: () => _showDetail(context),
      trailing: item.isPending
          ? const Tooltip(
              message: 'Feltöltésre vár',
              child: Icon(Icons.cloud_upload_outlined,
                  size: 20, color: Colors.orange))
          : PopupMenuButton<String>(
              onSelected: (a) {
                switch (a) {
                  case 'edit':
                    onEdit();
                  case 'delete':
                    onDelete();
                }
              },
              itemBuilder: (_) => const [
                PopupMenuItem(value: 'edit', child: Text('Szerkesztés')),
                PopupMenuItem(value: 'delete', child: Text('Törlés')),
              ],
            ),
    );
  }

  void _showDetail(BuildContext context) {
    Get.dialog(AlertDialog(
      title: Text(contact.name),
      content: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          if (contact.address.isNotEmpty)
            _row(Icons.location_on_outlined, contact.address),
          if (contact.phone.isNotEmpty)
            _row(Icons.phone_outlined, contact.phone,
                onTap: () => _launch('tel:${contact.phone}')),
          if (contact.email.isNotEmpty)
            _row(Icons.email_outlined, contact.email,
                onTap: () => _launch('mailto:${contact.email}')),
          if (contact.note.isNotEmpty) _row(Icons.notes_outlined, contact.note),
        ],
      ),
      actions: [
        TextButton(
            onPressed: () {
              Get.back();
              onEdit();
            },
            child: const Text('Szerkesztés')),
        TextButton(onPressed: Get.back, child: const Text('Bezár')),
      ],
    ));
  }

  Widget _row(IconData icon, String text, {VoidCallback? onTap}) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: InkWell(
        onTap: onTap,
        child: Row(
          children: [
            Icon(icon, size: 18, color: Colors.grey),
            const SizedBox(width: 10),
            Expanded(
              child: Text(text,
                  style: TextStyle(
                    color: onTap != null ? Colors.blue : null,
                    decoration: onTap != null ? TextDecoration.underline : null,
                  )),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _launch(String uri) async {
    final u = Uri.parse(uri);
    if (await canLaunchUrl(u)) await launchUrl(u);
  }
}

// ── Állapot-widgetek ─────────────────────────────────────────────────

class _NoAccess extends StatelessWidget {
  const _NoAccess();
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(32),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(Icons.lock_outline, size: 48, color: Colors.grey.shade400),
            const SizedBox(height: 12),
            const Text(
              'Nincs jogosultságod a kapcsolatok eléréséhez.\n'
              'Kérj hozzáférést a rendszergazdától.',
              textAlign: TextAlign.center,
            ),
          ],
        ),
      ),
    );
  }
}

class _ErrorState extends StatelessWidget {
  final String message;
  final VoidCallback onRetry;
  const _ErrorState({required this.message, required this.onRetry});
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(32),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(Icons.cloud_off, size: 44, color: Colors.grey.shade400),
            const SizedBox(height: 12),
            Text(message, textAlign: TextAlign.center),
            const SizedBox(height: 12),
            FilledButton(onPressed: onRetry, child: const Text('Újra')),
          ],
        ),
      ),
    );
  }
}