import 'dart:io';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:uuid/uuid.dart';
import '../models/pet_model.dart';
import '../utils/log_manager.dart';

class FirestoreService {
  final FirebaseFirestore _db = FirebaseFirestore.instance;
  final FirebaseStorage _storage = FirebaseStorage.instance;
  final FirebaseAuth _auth = FirebaseAuth.instance;

  // 반려동물 등록
  Future<void> registerPet(Pet pet, File? imageFile) async {
    try {
      String? imageUrl;

      // 1. 이미지 업로드 (이미지가 있는 경우)
      if (imageFile != null) {
        final String fileName =
            '${pet.id}_${DateTime.now().millisecondsSinceEpoch}.jpg';
        final Reference storageRef = _storage
            .ref()
            .child('pet_images')
            .child(fileName);

        LogManager().addLog(
          '[Storage] Starting upload to ${storageRef.fullPath}',
        );
        LogManager().addLog('[Storage] Bucket: ${_storage.bucket}');

        final TaskSnapshot snapshot = await storageRef.putFile(imageFile);

        if (snapshot.state == TaskState.success) {
          LogManager().addLog(
            '[Storage] Upload success. Validating metadata...',
          );
          // 잠시 대기 (consistency 이슈 방지)
          await Future.delayed(const Duration(milliseconds: 500));
          imageUrl = await storageRef.getDownloadURL();
          LogManager().addLog('[Storage] Download URL retrieved: $imageUrl');
        } else {
          throw Exception('이미지 업로드 실패 (상태: ${snapshot.state})');
        }
      }

      // 2. Pet 객체에 이미지 URL 업데이트 (새로운 객체 생성)
      Pet petWithImage = Pet(
        id: pet.id,
        ownerId: pet.ownerId,
        name: pet.name,
        species: pet.species,
        breed: pet.breed,
        gender: pet.gender,
        isNeutered: pet.isNeutered,
        birthDate: pet.birthDate,
        isDateUnknown: pet.isDateUnknown,
        registrationNumber: pet.registrationNumber,
        profileImageUrl: imageUrl, // 이미지 URL 설정
        diseases: pet.diseases,
        pastDiseases: pet.pastDiseases,
        healthConcerns: pet.healthConcerns,
        createdAt: pet.createdAt,
      );

      // 3. Firestore에 저장
      await _db.collection('pets').doc(pet.id).set(petWithImage.toMap());

      LogManager().addLog('[Firestore] Pet registered successfully: ${pet.id}');
    } catch (e) {
      LogManager().addLog('[Firestore] Error registering pet: $e');
      throw Exception('반려동물 등록 실패: $e');
    }
  }

  // 현재 로그인한 사용자의 ID 가져오기
  String? getCurrentUserId() {
    return _auth.currentUser?.uid;
  }

  // 반려동물 리스트 스트림 가져오기
  Stream<List<Pet>> getPets(String userId) {
    return _db
        .collection('pets')
        .where('ownerId', isEqualTo: userId)
        .orderBy('createdAt', descending: true) // 최신 등록순
        .snapshots()
        .map((snapshot) {
          return snapshot.docs.map((doc) => Pet.fromMap(doc.data())).toList();
        });
  }

  // 새 Pet ID 생성
  String generatePetId() {
    return const Uuid().v4();
  }
}