import SwiftUI

struct TopBarView: View {
    var title: String
    
    // Состояния для ProfileTab
    @Binding var selectedAccount: String
//    @Binding var sheetType: ProfileTab.SheetType?
    var accounts: [String]
//    var viewModel: LoginViewModel
    @ObservedObject var viewModel: LoginViewModel
    
    // Привязка для управления боковым меню
    @Binding var isSideMenuPresented: Bool
    @Binding var chatSearchRevealProgress: CGFloat
    @Binding var chatSearchText: String
    
    var isHomeTab: Bool {
        return title == "Home"
    }
    
    var isChatsTab: Bool {
        return title == "Chats"
    }
    
    var isProfileTab: Bool {
        return title == "Profile"
    }

    private var shouldShowConnectionStatus: Bool {
        viewModel.socketState != .connected
    }

    var body: some View {
        VStack(spacing: 0) {
            HStack {
                // Кнопка "Гамбургер" для открытия меню
                Button(action: {
                    withAnimation {
                        isSideMenuPresented.toggle()
                    }
                }) {
                    Image(systemName: "line.horizontal.3")
                        .imageScale(.large)
                        .foregroundColor(.primary)
                }
                
//                Spacer()
                
                if shouldShowConnectionStatus {
                    connectionStatusView
                    Spacer()
                } else if isHomeTab{
                    Text("Yobble")
                        .font(.largeTitle)
                        .fontWeight(.bold)
                    Spacer()
                } else if isProfileTab {
                    Spacer()
                    Button(action: { }) {
                        HStack(spacing: 4) {
                            Text("@\(viewModel.username)")
                                .font(.headline)
                                .foregroundColor(.primary)
                            Image(systemName: "chevron.down")
                                .font(.subheadline)
                                .foregroundColor(.gray)
                        }
                    }
                    Spacer()
                } else {
                    Text(title)
                        .font(.largeTitle)
                        .fontWeight(.bold)
                    Spacer()
                }
                
                if isHomeTab{
                    HStack(spacing: 20) {
                        // Кнопка поиска
                        Button(action: {
                            // пока ничего не делаем
                        }) {
                            Image(systemName: "magnifyingglass")
                                .imageScale(.large)
                                .foregroundColor(.primary)
                        }
                        // Кнопка уведомлений
                        Button(action: {
                            // пока ничего не делаем
                        }) {
                            Image(systemName: "bell")
                                .imageScale(.large)
                                .foregroundColor(.primary)
                        }
                    }
                } else if isChatsTab {
                    Button(action: {
                        NotificationCenter.default.post(name: .debugRefreshChats, object: nil)
                    }) {
                        Text(NSLocalizedString("DEBUG UPDATE", comment: ""))
                            .foregroundColor(.primary)
                    }
                } else if isProfileTab {
                    NavigationLink(destination: SettingsView(viewModel: viewModel)) {
                        Image(systemName: "wrench")
                            .imageScale(.large)
                            .foregroundColor(.primary)
                    }
                }
            }
            .padding()
            .frame(height: 50) // Стандартная высота для нав. бара
            
            if isChatsTab {
                revealableSearchBar
            }

            Divider()
        }
        .background(Color(UIColor.systemBackground))
        .onChange(of: isChatsTab) { isChats in
            let hasSearchText = !chatSearchText.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
            if !isChats {
                guard !hasSearchText else { return }
                withAnimation(.spring(response: 0.35, dampingFraction: 0.75)) {
                    chatSearchRevealProgress = 0
                }
            } else if hasSearchText {
                withAnimation(.spring(response: 0.35, dampingFraction: 0.75)) {
                    chatSearchRevealProgress = 1
                }
            }
        }
    }
}

private extension TopBarView {
    var connectionStatusView: some View {
        HStack(spacing: 8) {
            ProgressView()
                .progressViewStyle(.circular)
            Text(NSLocalizedString("Подключение", comment: ""))
                .font(.headline)
                .foregroundColor(.primary)
        }
    }

    private var normalizedRevealProgress: CGFloat {
        guard isChatsTab else { return 0 }
        return max(0, min(chatSearchRevealProgress, 1))
    }

    private var revealableSearchBar: some View {
        let progress = normalizedRevealProgress
        return VStack(spacing: 0) {
            searchBar
                .padding(.horizontal)
                .padding(.bottom, searchBarBottomSpacing)
                .opacity(progress)
        }
        .frame(height: searchBarRevealHeight * progress, alignment: .top)
        .clipped()
        .allowsHitTesting(progress > 0.9)
        .accessibilityHidden(progress < 0.9)
    }

    private var searchBarRevealHeight: CGFloat { searchBarBaseHeight + searchBarBottomSpacing }

    // 36 min height + 6 * 2 vertical padding inside searchBar
    private var searchBarBaseHeight: CGFloat { 48 }

    private var searchBarBottomSpacing: CGFloat { 0 }

    var searchBar: some View {
        HStack(spacing: 8) {
            Image(systemName: "magnifyingglass")
                .foregroundColor(.secondary)
            TextField(NSLocalizedString("Поиск", comment: ""), text: $chatSearchText)
                .textFieldStyle(.plain)
                .textInputAutocapitalization(.never)
                .autocorrectionDisabled()
            if !chatSearchText.isEmpty {
                Button(action: { chatSearchText = "" }) {
                    Image(systemName: "xmark.circle.fill")
                        .foregroundColor(.secondary)
                }
                .buttonStyle(.plain)
            }
        }
        .padding(.horizontal, 12)
        .padding(.vertical, 6)
        .frame(minHeight: 36)
        .background(
            RoundedRectangle(cornerRadius: 12, style: .continuous)
                .fill(Color(UIColor.secondarySystemBackground))
        )
    }
}

struct TopBarView_Previews: PreviewProvider {
    struct Wrapper: View {
        @State private var selectedAccount = "@user"
        @State private var isSideMenuPresented = false
        @State private var revealProgress: CGFloat = 1
        @StateObject private var viewModel = LoginViewModel()
        @State private var searchText: String = ""

        var body: some View {
            TopBarView(
                title: "Chats",
                selectedAccount: $selectedAccount,
                accounts: [selectedAccount],
                viewModel: viewModel,
                isSideMenuPresented: $isSideMenuPresented,
                chatSearchRevealProgress: $revealProgress,
                chatSearchText: $searchText
            )
        }
    }

    static var previews: some View {
        Wrapper()
            .environmentObject(ThemeManager())
    }
}