// ===========================================================================
// FILE: lib/ui/admin/admin_screen.dart
// ===========================================================================

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:intl/intl.dart';
import 'package:provider/provider.dart';
import '../../core/theme_manager.dart';

class AdminScreen extends StatelessWidget {
  const AdminScreen({super.key});

  @override
  Widget build(BuildContext context) {
    final theme = context.watch<ThemeManager>().currentColors;

    return Scaffold(
      backgroundColor: theme.background,
      appBar: AppBar(
        title: Text("DASHBOARD ADMIN 🕵️‍♂️", style: TextStyle(color: theme.text, fontWeight: FontWeight.w900, letterSpacing: 2)),
        backgroundColor: theme.background,
        iconTheme: IconThemeData(color: theme.text),
        elevation: 0,
      ),
      body: StreamBuilder<QuerySnapshot>(
        // Ordiniamo per Ultimo Accesso, così i giocatori attivi di recente sono in cima!
          stream: FirebaseFirestore.instance.collection('leaderboard').orderBy('lastActive', descending: true).snapshots(),
          builder: (context, snapshot) {
            if (snapshot.connectionState == ConnectionState.waiting) {
              return Center(child: CircularProgressIndicator(color: theme.playerBlue));
            }
            if (!snapshot.hasData || snapshot.data!.docs.isEmpty) {
              return Center(child: Text("Nessun giocatore trovato nel database.", style: TextStyle(color: theme.text)));
            }

            var docs = snapshot.data!.docs;

            return ListView.builder(
              padding: const EdgeInsets.all(16),
              itemCount: docs.length,
              itemBuilder: (context, index) {
                var data = docs[index].data() as Map<String, dynamic>;

                String name = data['name'] ?? 'Fantasma';
                int level = data['level'] ?? 1;
                int xp = data['xp'] ?? 0;
                int wins = data['wins'] ?? 0;
                String platform = data['platform'] ?? 'Sconosciuta';

                // Formattazione Date (Se esistono)
                DateTime? created;
                if (data['accountCreated'] != null) created = (data['accountCreated'] as Timestamp).toDate();

                DateTime? lastActive;
                if (data['lastActive'] != null) lastActive = (data['lastActive'] as Timestamp).toDate();

                String createdStr = created != null ? DateFormat('dd MMM yyyy').format(created) : 'N/D';
                String lastActiveStr = lastActive != null ? DateFormat('dd MMM yyyy - HH:mm').format(lastActive) : 'N/D';

                IconData platformIcon = Icons.device_unknown;
                if (platform == 'iOS') platformIcon = Icons.apple;
                if (platform == 'Android') platformIcon = Icons.android;

                return Card(
                  color: theme.text.withOpacity(0.05),
                  elevation: 0,
                  margin: const EdgeInsets.only(bottom: 12),
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(15),
                      side: BorderSide(color: theme.gridLine.withOpacity(0.3))
                  ),
                  child: Padding(
                    padding: const EdgeInsets.all(16),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Row(
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: [
                            Text(name, style: TextStyle(color: theme.playerBlue, fontSize: 22, fontWeight: FontWeight.w900)),
                            Icon(platformIcon, color: theme.text.withOpacity(0.7)),
                          ],
                        ),
                        const SizedBox(height: 8),
                        Row(
                          children: [
                            Text("Liv. $level", style: TextStyle(color: theme.playerRed, fontWeight: FontWeight.bold, fontSize: 16)),
                            const SizedBox(width: 15),
                            Text("$xp XP", style: TextStyle(color: theme.text.withOpacity(0.7))),
                            const SizedBox(width: 15),
                            Text("Vittorie: $wins", style: TextStyle(color: Colors.amber.shade700, fontWeight: FontWeight.bold)),
                          ],
                        ),
                        const Padding(
                          padding: EdgeInsets.symmetric(vertical: 8.0),
                          child: Divider(),
                        ),
                        Row(
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          children: [
                            Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              children: [
                                Text("Registrato il:", style: TextStyle(color: theme.text.withOpacity(0.5), fontSize: 10)),
                                Text(createdStr, style: TextStyle(color: theme.text, fontSize: 12, fontWeight: FontWeight.bold)),
                              ],
                            ),
                            Column(
                              crossAxisAlignment: CrossAxisAlignment.end,
                              children: [
                                Text("Ultimo Accesso:", style: TextStyle(color: theme.text.withOpacity(0.5), fontSize: 10)),
                                Text(lastActiveStr, style: TextStyle(color: Colors.green, fontSize: 12, fontWeight: FontWeight.bold)),
                              ],
                            ),
                          ],
                        )
                      ],
                    ),
                  ),
                );
              },
            );
          }
      ),
    );
  }
}