import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import '../utils/constants.dart';
import 'package:firebase_auth/firebase_auth.dart';


class NotificationScreen extends StatefulWidget {
  const NotificationScreen({super.key});

  @override
  State<NotificationScreen> createState() => _NotificationScreenState();
}

class _NotificationScreenState extends State<NotificationScreen> {
  String? namaSungai;
  bool isLoading = true;

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

  Future<void> getNamaSungai() async {
    try {
      final uid = FirebaseAuth.instance.currentUser?.uid;
      if (uid != null) {
        final doc =
            await FirebaseFirestore.instance.collection('users').doc(uid).get();
        setState(() {
          namaSungai = doc.data()?['nama_sungai'];
          isLoading = false;
        });
      } else {
        setState(() {
          isLoading = false;
        });
      }
    } catch (e) {
      print('Gagal mengambil nama sungai: $e');
      setState(() {
        isLoading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    if (isLoading) {
      return const Scaffold(
        body: Center(child: CircularProgressIndicator()),
      );
    }

    if (namaSungai == null) {
      return const Scaffold(
        body: Center(child: Text("Gagal memuat nama sungai.")),
      );
    }

    return Scaffold(
      backgroundColor: AppColors.background,
      appBar: AppBar(
        backgroundColor: Colors.white,
        title: const Text("Notifikasi", style: TextStyle(color: Colors.black)),
        centerTitle: true,
        iconTheme: const IconThemeData(color: Colors.black),
        elevation: 0,
      ),
      body: StreamBuilder<QuerySnapshot>(
        stream: FirebaseFirestore.instance
            .collection(namaSungai!) // Nama koleksi sesuai nama_sungai
            .doc("notifikasi")
            .collection("data")
            .orderBy("timestamp", descending: true)
            .snapshots(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          }

          if (!snapshot.hasData || snapshot.data!.docs.isEmpty) {
            return const Center(child: Text("Tidak ada notifikasi."));
          }

          final notifications = snapshot.data!.docs.map((doc) {
            var data = doc.data() as Map<String, dynamic>;

            return {
              'id': doc.id,
              'title': data['title'] ?? 'Tanpa Judul',
              'message': data['message'] ?? 'Pesan tidak tersedia.',
              'time': formatTimestamp(data['timestamp'] ?? Timestamp.now()),
              'level': data['level'] ?? 'AMAN',
              'color': getNotificationColor(data['level'] ?? 'AMAN'),
            };
          }).toList();

          return ListView.builder(
            padding: const EdgeInsets.all(16),
            itemCount: notifications.length,
            itemBuilder: (context, index) {
              final notif = notifications[index];
              return Dismissible(
                key: Key(notif['id']),
                direction: DismissDirection.endToStart,
                onDismissed: (direction) {
                  _deleteNotification(notif['id']);
                  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                    content: Text("${notif['title']} dihapus"),
                  ));
                },
                background: Container(
                  color: Colors.red,
                  child: const Align(
                    alignment: Alignment.centerRight,
                    child: Padding(
                      padding: EdgeInsets.symmetric(horizontal: 20),
                      child: Icon(Icons.delete, color: Colors.white),
                    ),
                  ),
                ),
                child: Container(
                  margin: const EdgeInsets.only(bottom: 12),
                  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(16),
                    border: Border.all(color: notif['color'].withOpacity(0.25)),
                  ),
                  child: Row(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Container(
                        padding: const EdgeInsets.all(12),
                        decoration: BoxDecoration(
                          color: notif['color'].withOpacity(0.1),
                          shape: BoxShape.circle,
                        ),
                        child: Icon(Icons.notifications, color: notif['color'], size: 24),
                      ),
                      const SizedBox(width: 12),
                      Expanded(
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Row(
                              mainAxisAlignment: MainAxisAlignment.spaceBetween,
                              children: [
                                Expanded(
                                  child: Text(
                                    notif['title'],
                                    style: TextStyle(
                                      fontWeight: FontWeight.w600,
                                      color: notif['color'],
                                      fontSize: 15,
                                    ),
                                  ),
                                ),
                                Text(
                                  notif['time'],
                                  style: const TextStyle(fontSize: 12, color: Colors.grey),
                                ),
                              ],
                            ),
                            const SizedBox(height: 6),
                            Text(
                              notif['message'],
                              style: const TextStyle(color: Colors.black87, fontSize: 14),
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                ),
              );
            },
          );
        },
      ),
    );
  }

  String formatTimestamp(Timestamp timestamp) {
    final date = timestamp.toDate();
    final monthNames = [
      "Januari", "Februari", "Maret", "April", "Mei", "Juni",
      "Juli", "Agustus", "September", "Oktober", "November", "Desember"
    ];

    return "${date.day} ${monthNames[date.month - 1]}, ${date.year}, ${date.hour}:${date.minute}";
  }

  Color getNotificationColor(String level) {
    switch (level) {
      case "BAHAYA":
        return Colors.red;
      case "WASPADA":
        return Colors.orange;
      default:
        return const Color(0xFF00C2FF);
    }
  }

  Future<void> _deleteNotification(String notifId) async {
    if (namaSungai == null) return;

    try {
      await FirebaseFirestore.instance
          .collection(namaSungai!)
          .doc("notifikasi")
          .collection("data")
          .doc(notifId)
          .delete();
    } catch (e) {
      print("Gagal menghapus notifikasi: $e");
    }
  }
}