import SwiftUI

struct ConversationListView: View {
    var appState: AppState
    @Bindable var viewModel: ConversationListVM
    @State private var showNewConversation = false
    @State private var showProfile = false
    @State private var selectedConversation: Conversation?

    var body: some View {
        NavigationStack {
            List {
                // Invitations section
                if !viewModel.invitations.isEmpty {
                    Section {
                        ForEach(viewModel.invitations) { invitation in
                            InvitationBanner(
                                invitation: invitation,
                                onAccept: {
                                    Task {
                                        let (success, _) = await appState.chatClient.acceptInvitation(convId: invitation.conversationId)
                                        if success {
                                            await viewModel.refresh(chatClient: appState.chatClient)
                                        }
                                    }
                                },
                                onDecline: {
                                    Task {
                                        _ = await appState.chatClient.declineInvitation(convId: invitation.conversationId)
                                        await viewModel.refresh(chatClient: appState.chatClient)
                                    }
                                }
                            )
                        }
                    } header: {
                        Text("Invitations")
                    }
                }

                // Conversations section
                Section {
                    ForEach(viewModel.conversations) { conversation in
                        NavigationLink(value: conversation) {
                            ConversationRowView(
                                conversation: conversation,
                                currentUserId: appState.currentUser?.id ?? "",
                                isOnline: conversation.dmPartnerId(currentUserId: appState.currentUser?.id ?? "")
                                    .map { viewModel.onlineUsers.contains($0) } ?? false,
                                unreadCount: viewModel.unreadCounts[conversation.id] ?? 0,
                                avatarData: viewModel.avatarCache[conversation.id]
                            )
                        }
                        .contextMenu {
                            Button(conversation.isFavorite ? "Remove from Favorites" : "Add to Favorites") {
                                viewModel.toggleFavorite(convId: conversation.id, email: appState.email)
                            }
                        }
                    }
                }
            }
            .navigationTitle("Chats")
            .navigationDestination(for: Conversation.self) { conversation in
                ChatView(
                    conversation: conversation,
                    appState: appState,
                    conversationListVM: viewModel
                )
            }
            .toolbar {
                ToolbarItem(placement: .topBarLeading) {
                    ConnectionIndicator(status: appState.connectionStatus)
                }
                ToolbarItem(placement: .topBarTrailing) {
                    HStack {
                        Button(action: { showProfile = true }) {
                            Image(systemName: "person.circle")
                        }
                        Button(action: { showNewConversation = true }) {
                            Image(systemName: "square.and.pencil")
                        }
                    }
                }
            }
            .refreshable {
                await viewModel.refresh(chatClient: appState.chatClient)
            }
            .sheet(isPresented: $showNewConversation) {
                NewConversationSheet(appState: appState) { convId in
                    showNewConversation = false
                    await viewModel.refresh(chatClient: appState.chatClient)
                }
            }
            .sheet(isPresented: $showProfile) {
                ProfileView(appState: appState, isOwnProfile: true)
            }
            .task {
                await viewModel.load(chatClient: appState.chatClient, email: appState.email)
            }
        }
    }
}