import 'dart:io';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_storage/firebase_storage.dart';
import '../models/project_model.dart';
import '../models/branch_model.dart';
import '../models/project_doc_model.dart';

class ProjectService {
  FirebaseFirestore get _db => FirebaseFirestore.instance;
  FirebaseStorage get _storage => FirebaseStorage.instance;

  Stream<List<ProjectModel>> getProjects() {
    return _db.collection('projects')
      .orderBy('createdAt', descending: true)
      .snapshots()
      .map((snapshot) => snapshot.docs.map((doc) => 
        ProjectModel.fromMap(doc.id, doc.data())).toList());
  }

  Future<void> addProject(ProjectModel project) async {
    await _db.collection('projects').add(project.toMap());
  }

  Future<void> updateProject(ProjectModel project) async {
    await _db.collection('projects').doc(project.id).update(project.toMap());
  }

  Future<void> deleteProject(String id) async {
    // Note: In real app, consider deleting subcollections and storage files too.
    await _db.collection('projects').doc(id).delete();
  }

  // Branches
  Stream<List<BranchModel>> getBranches(String projectId) {
    return _db.collection('projects').doc(projectId).collection('branches')
      .snapshots()
      .map((snapshot) => snapshot.docs.map((doc) => 
        BranchModel.fromMap(doc.id, doc.data())).toList());
  }

  Future<List<BranchModel>> getBranchesOnce(String projectId) async {
    var snapshot = await _db.collection('projects').doc(projectId).collection('branches').get();
    return snapshot.docs.map((doc) => BranchModel.fromMap(doc.id, doc.data())).toList();
  }

  Future<void> addBranch(String projectId, String name) async {
    await _db.collection('projects').doc(projectId).collection('branches').add({
      'name': name
    });
  }

  Future<void> deleteBranch(String projectId, String branchId) async {
    await _db.collection('projects').doc(projectId).collection('branches').doc(branchId).delete();
  }

  // Docs
  Stream<List<ProjectDocModel>> getDocs(String projectId) {
    return _db.collection('projects').doc(projectId).collection('docs')
      .orderBy('uploadedAt', descending: true)
      .snapshots()
      .map((snapshot) => snapshot.docs.map((doc) => 
        ProjectDocModel.fromMap(doc.id, doc.data())).toList());
  }

  Future<void> addDoc(String projectId, String label, String url, String type) async {
    await _db.collection('projects').doc(projectId).collection('docs').add({
      'label': label,
      'url': url,
      'type': type,
      'uploadedAt': FieldValue.serverTimestamp(),
    });
  }

  Future<void> deleteDoc(String projectId, String docId) async {
    await _db.collection('projects').doc(projectId).collection('docs').doc(docId).delete();
  }

  Future<String> uploadDoc(String projectId, File file) async {
    String fileName = "${DateTime.now().millisecondsSinceEpoch}_${file.path.split(Platform.pathSeparator).last}";
    var ref = _storage.ref().child('projects').child(projectId).child('docs').child(fileName);
    var uploadTask = await ref.putFile(file);
    return await uploadTask.ref.getDownloadURL();
  }
}