import SwiftUI

struct BookmarksView: View {
    @State private var viewModel = BookmarksViewModel()
    @State private var showingAddBookmark = false
    @State private var selectedBookmarkId: String?
    let state: BookmarkState
    
    @State private var showingAddBookmarkFromShare = false
    @State private var shareURL = ""
    @State private var shareTitle = ""
    
    @FetchRequest(entity: BookmarkEntity.entity(), sortDescriptors: [])
    private var bookmarks: FetchedResults<BookmarkEntity>
    
    var body: some View {
        NavigationStack {
            ZStack {
                List {
                    ForEach(bookmarks) { bookmark in
                        Button(action: {
                            selectedBookmarkId = bookmark.id
                        }) {
                            BookmarkEntityCardView(
                                bookmark: bookmark,
                                currentState: state,
                                onArchive: { bookmark in
                                    Task {
                                        //await viewModel.toggleArchive(bookmark: bookmark)
                                    }
                                },
                                onDelete: { bookmark in
                                    Task {
                                        //await viewModel.deleteBookmark(bookmark: bookmark)
                                    }
                                },
                                onToggleFavorite: { bookmark in
                                    Task {
                                        //await viewModel.toggleFavorite(bookmark: bookmark)
                                    }
                                }
                            )
                        }
                        .listRowSeparator(.hidden)
                        .listRowBackground(Color.clear)
                        .listStyle(.plain)
                        .refreshable {
                            await viewModel.refreshBookmarks()
                        }
                        .overlay {
                            if bookmarks.isEmpty {
                                ContentUnavailableView(
                                    "Keine Bookmarks",
                                    systemImage: "bookmark",
                                    description: Text("Es wurden noch keine Bookmarks in \(state.displayName.lowercased()) gefunden.")
                                )
                            }
                        }
                    }
                }
                
                // FAB Button - nur bei "Ungelesen" anzeigen
                if state == .unread {
                    VStack {
                        Spacer()
                        HStack {
                            Spacer()
                            
                            Button(action: {
                                showingAddBookmark = true
                            }) {
                                Image(systemName: "plus")
                                    .font(.title2)
                                    .fontWeight(.semibold)
                                    .foregroundColor(.white)
                                    .frame(width: 56, height: 56)
                                    .background(Color.accentColor)
                                    .clipShape(Circle())
                                    .shadow(color: .black.opacity(0.25), radius: 6, x: 0, y: 3)
                            }
                            .padding(.trailing, 20)
                            .padding(.bottom, 20)
                        }
                    }
                }
            }
            .navigationTitle(state.displayName)
            .navigationDestination(item: Binding<String?>(
                get: { selectedBookmarkId },
                set: { selectedBookmarkId = $0 }
            )) { bookmarkId in
                BookmarkDetailView(bookmarkId: bookmarkId)
            }
            .sheet(isPresented: $showingAddBookmark) {
                AddBookmarkView(prefilledURL: shareURL, prefilledTitle: shareTitle)
            }
            .alert("Fehler", isPresented: .constant(viewModel.errorMessage != nil)) {
                Button("OK", role: .cancel) {
                    viewModel.errorMessage = nil
                }
            } message: {
                Text(viewModel.errorMessage ?? "")
            }
            .task {
                await viewModel.loadBookmarks(state: state)
                await viewModel.syncBookmarks()
            }
            .onChange(of: showingAddBookmark) { oldValue, newValue in
                // Refresh bookmarks when sheet is dismissed
                if oldValue && !newValue {
                    Task {
                        await viewModel.loadBookmarks(state: state)
                    }
                }
            }
            .onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("AddBookmarkFromShare"))) { notification in
                handleShareNotification(notification)
            }
        }
    }
    
    private func handleShareNotification(_ notification: Notification) {
        guard let userInfo = notification.userInfo,
              let url = userInfo["url"] as? String,
              !url.isEmpty else {
            return
        }
        
        shareURL = url
        shareTitle = userInfo["title"] as? String ?? ""
        showingAddBookmark = true
        
        print("Received share notification - URL: \(url), Title: \(shareTitle)")
    }
}

// String Identifiable Extension für navigationDestination
extension String: Identifiable {
    public var id: String { self }
}