import SwiftUI

struct LibraryView: View {
    @ObservedObject var authManager: AuthManager
    @State private var books: [AudiobookItem] = []
    @State private var isLoading = true
    @State private var errorMessage = ""
    
    var body: some View {
        NavigationView {
            Group {
                if isLoading {
                    ProgressView("Lädt Bibliothek...")
                } else if !errorMessage.isEmpty {
                    Text(errorMessage).foregroundColor(.red)
                } else {
                    ScrollView {
                        LazyVGrid(columns: [GridItem(.adaptive(minimum: 150))], spacing: 16) {
                            ForEach(books) { book in
                                BookCard(book: book, authManager: authManager)
                            }
                        }
                        .padding()
                    }
                }
            }
            .navigationTitle("Meine Bibliothek")
            .toolbar {
                Button("Logout") {
                    authManager.logout()
                }
            }
        }
        .onAppear { loadBooks() }
    }
    
    func loadBooks() {
        guard let serverURL = authManager.serverURL,
              let token = authManager.token else { return }
        
        // Erst Libraries laden, dann Bücher
        let url = URL(string: "\(serverURL)/api/libraries")!
        var request = URLRequest(url: url)
        request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
        
        URLSession.shared.dataTask(with: request) { data, _, error in
            guard let data = data else { return }
            if let json = try? JSONSerialization.jsonObject(with: data) as? [String: Any],
               let libraries = json["libraries"] as? [[String: Any]],
               let firstLib = libraries.first,
               let libId = firstLib["id"] as? String {
                loadBooksFromLibrary(libId: libId, serverURL: serverURL, token: token)
            }
        }.resume()
    }
    
    func loadBooksFromLibrary(libId: String, serverURL: String, token: String) {
        let url = URL(string: "\(serverURL)/api/libraries/\(libId)/items")!
        var request = URLRequest(url: url)
        request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
        
        URLSession.shared.dataTask(with: request) { data, _, _ in
            guard let data = data else { return }
            if let json = try? JSON