import 'package:flutter/material.dart';
import '../services/offline_package_manager.dart';

class OfflinePackageDialog extends StatefulWidget {
  final VoidCallback onPackageSynced;

  const OfflinePackageDialog({super.key, required this.onPackageSynced});

  @override
  State<OfflinePackageDialog> createState() => _OfflinePackageDialogState();
}

class _OfflinePackageDialogState extends State<OfflinePackageDialog> {
  bool _isDownloading = false;
  OfflinePackageInfo? _info;

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

  Future<void> _loadPackageInfo() async {
    final info = await OfflinePackageManager.getPackageInfo();
    if (mounted) setState(() => _info = info);
  }

  Future<void> _startSync({bool force = false}) async {
    setState(() => _isDownloading = true);
    final success = await OfflinePackageManager.downloadFullPackage(force: force);
    if (mounted) {
      setState(() => _isDownloading = false);
      await _loadPackageInfo();
      if (success) {
        widget.onPackageSynced();
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Dialog(
      backgroundColor: const Color(0xFF0F172A),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20), side: const BorderSide(color: Color(0xFF0071E3), width: 1.5)),
      child: Padding(
        padding: const EdgeInsets.all(20),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // Header
            Row(
              children: [
                Container(
                  padding: const EdgeInsets.all(8),
                  decoration: BoxDecoration(
                    color: const Color(0x330071E3),
                    borderRadius: BorderRadius.circular(10),
                    border: Border.all(color: const Color(0xFF0071E3)),
                  ),
                  child: const Icon(Icons.download_for_offline, color: Color(0xFF38BDF8), size: 22),
                ),
                const SizedBox(width: 12),
                const Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        'حزمة بيانات الأردن التكتيكية',
                        style: TextStyle(color: Colors.white, fontSize: 14, fontWeight: FontWeight.bold),
                      ),
                      Text(
                        'Offline Sovereign Data Package v2.4',
                        style: TextStyle(color: Color(0xFF94A3B8), fontSize: 10.5),
                      ),
                    ],
                  ),
                ),
                IconButton(
                  icon: const Icon(Icons.close, color: Colors.white54, size: 18),
                  onPressed: () => Navigator.pop(context),
                ),
              ],
            ),

            const SizedBox(height: 16),

            // Package Stats Container
            Container(
              padding: const EdgeInsets.all(14),
              decoration: BoxDecoration(
                color: const Color(0xFF020617),
                borderRadius: BorderRadius.circular(12),
                border: Border.all(color: Colors.white12),
              ),
              child: Column(
                children: [
                  _buildStatRow('حجم حزمة التوجيه والطرق:', '3.5 MB (شبكة طوبولوجية كاملة)'),
                  const Divider(color: Colors.white12, height: 14),
                  _buildStatRow('حجم معالم PostGIS المفهرسة:', '~25 MB (SQLite FTS5 سريع)'),
                  const Divider(color: Colors.white12, height: 14),
                  _buildStatRow('محرك التوجيه غير المتصل:', '100% On-Device (محرك Valhalla الحقيقي)'),
                  const Divider(color: Colors.white12, height: 14),
                  _buildStatRow('تحديث الحزم الميدانية:', 'متاح دائماً وفوري عند الطلب'),
                  if (_info?.lastSyncTime != null) ...[
                    const Divider(color: Colors.white12, height: 14),
                    _buildStatRow(
                      'آخر مزامنة ناجحة:',
                      '${_info!.lastSyncTime!.day}/${_info!.lastSyncTime!.month}/${_info!.lastSyncTime!.year}',
                    ),
                  ],
                ],
              ),
            ),

            const SizedBox(height: 16),

            // Live Sync Progress Stream
            ValueListenableBuilder<double>(
              valueListenable: OfflinePackageManager.syncProgress,
              builder: (context, progress, _) {
                return ValueListenableBuilder<String>(
                  valueListenable: OfflinePackageManager.syncStatusMessage,
                  builder: (context, msg, _) {
                    return Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        if (_isDownloading) ...[
                          LinearProgressIndicator(
                            value: progress > 0 ? progress : null,
                            backgroundColor: const Color(0xFF1E293B),
                            color: const Color(0xFF0071E3),
                            borderRadius: BorderRadius.circular(4),
                          ),
                          const SizedBox(height: 8),
                        ],
                        Text(
                          msg,
                          style: TextStyle(
                            color: progress == 1.0 ? const Color(0xFF4ADE80) : const Color(0xFF94A3B8),
                            fontSize: 11,
                            fontWeight: progress == 1.0 ? FontWeight.bold : FontWeight.normal,
                          ),
                        ),
                      ],
                    );
                  },
                );
              },
            ),

            const SizedBox(height: 18),

            // Action Buttons
            Row(
              children: [
                Expanded(
                  child: ElevatedButton.icon(
                    onPressed: _isDownloading
                        ? null
                        : () => _startSync(force: true),
                    icon: _isDownloading
                        ? const SizedBox(width: 14, height: 14, child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white))
                        : const Icon(Icons.cloud_download, size: 16),
                    label: Text(
                      _isDownloading
                          ? 'جاري التنزيل والمزامنة...'
                          : 'مزامنة وتنزيل الحزمة الآن (غراف الطرق الحقيقي + المعالم)',
                      style: const TextStyle(fontSize: 11.5, fontWeight: FontWeight.bold),
                    ),
                    style: ElevatedButton.styleFrom(
                      backgroundColor: const Color(0xFF0071E3),
                      foregroundColor: Colors.white,
                      padding: const EdgeInsets.symmetric(vertical: 12),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(10),
                        side: const BorderSide(color: Color(0xFF0071E3)),
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildStatRow(String title, String value) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: [
        Expanded(
          child: Text(
            title,
            style: const TextStyle(color: Color(0xFF94A3B8), fontSize: 11),
            overflow: TextOverflow.ellipsis,
          ),
        ),
        const SizedBox(width: 8),
        Text(
          value,
          style: const TextStyle(color: Colors.white, fontSize: 11, fontWeight: FontWeight.bold),
        ),
      ],
    );
  }
}