//
//  MainView.swift
//  iKeyMon
//
//  Created by tracer on 30.03.25.
//

import SwiftUI

struct MainView: View {
    
    @State var showAddServerSheet: Bool = false
    @State private var serverBeingEdited: Server?
    @State private var serverToDelete: Server?
    @State private var showDeleteConfirmation = false
    @State private var isFetchingInfo: Bool = false
    @State private var refreshTimer = Timer.publish(every: 60, on: .main, in: .common).autoconnect()
    @State private var progress: Double = 0
    @State private var lastRefresh = Date()
    @State private var pingTimer: Timer?
    private let serverOrderKey = "serverOrder"

    @State private var servers: [Server] = {
        if let data = UserDefaults.standard.data(forKey: "storedServers"),
           let saved = try? JSONDecoder().decode([Server].self, from: data) {

            if let idStrings = UserDefaults.standard.stringArray(forKey: "serverOrder") {
                let idMap = idStrings.compactMap(UUID.init)
                return saved.sorted { a, b in
                    guard
                        let i1 = idMap.firstIndex(of: a.id),
                        let i2 = idMap.firstIndex(of: b.id)
                    else { return false }
                    return i1 < i2
                }
            }

            return saved
        }
        return []
    }()

//    @State private var selectedServer: Server?
    @State private var selectedServerID: UUID?

    var body: some View {
            
        NavigationSplitView {
            List(selection: $selectedServerID) {
                ForEach(servers) { server in
                    HStack {
                        Image(systemName: "dot.circle.fill")
                            .foregroundColor(server.pingable ? .green : .red)
                        Text(server.hostname)
                    }
                    .tag(server)
                    .contextMenu {
                        Button("Edit") {
                            print("Editing:", server.hostname)
                            serverBeingEdited = server
                        }
                        Divider()
                        Button("Delete", role: .destructive) {
                            serverToDelete = server
                            showDeleteConfirmation = true
                        }
                    }
                }
                .onMove(perform: moveServer)
            }
            .toolbar {
                ToolbarItem(placement: .primaryAction) {
                    Button(action: { showAddServerSheet = true }) {
                        Image(systemName: "plus")
                    }
                    .help("Add Host")
                }
            }
            .navigationTitle("Servers")
            .onChange(of: selectedServerID) {
                if let selectedServerID {
                    UserDefaults.standard.set(selectedServerID.uuidString, forKey: "selectedServerID")
                    fetchServerInfo(for: selectedServerID)
                }
            }
        } detail: {
            if let selectedServerID,
               let index = servers.firstIndex(where: { selectedServerID == $0.id }) {
                ServerDetailView(server: $servers[index], isFetching: isFetchingInfo)
            } else {
                ContentUnavailableView("No Server Selected", systemImage: "server.rack")
            }
        }
        .sheet(isPresented: $showAddServerSheet) {
            ServerFormView(
                mode: .add,
                servers: $servers,
                dismiss: { showAddServerSheet = false }
            )
        }
        .sheet(item: $serverBeingEdited) { server in
            ServerFormView(
                mode: .edit(server),
                servers: $servers,
                dismiss: { serverBeingEdited = nil }
            )
        }
        .alert("Are you sure you want to delete this server?", isPresented: $showDeleteConfirmation, presenting: serverToDelete) { server in
            Button("Delete", role: .destructive) {
                ServerFormView.delete(server: server, from: &servers)
            }
            Button("Cancel", role: .cancel) {}
        }
        .onReceive(refreshTimer) { _ in
            for server in servers {
                print("fetching server: \(server.hostname)")
                fetchServerInfo(for: server.id)
            }
        }
        .onAppear {
            if let storedID = UserDefaults.standard.string(forKey: "selectedServerID"),
               let uuid = UUID(uuidString: storedID),
               servers.contains(where: { $0.id == uuid }) {
                selectedServerID = uuid
            } else if selectedServerID == nil, let first = servers.first {
                selectedServerID = first.id
            }
            pingAllServers()
            pingTimer = Timer.scheduledTimer(withTimeInterval: 10.0, repeats: true) { _ in
                pingAllServers()
            }
        }
        .frame(minWidth: 800, minHeight: 450)

    }
    
    private func fetchServerInfo(for id: UUID) {
        guard let server = servers.first(where: { $0.id == id }),
              let api = ServerAPI(server: server) else {
            return
        }

        isFetchingInfo = true

        Task {
            defer { isFetchingInfo = false }
            do {
                let info = try await api.fetchServerInfo()
                if let index = servers.firstIndex(where: { $0.id == id }) {
                    var updated = servers[index]
                    updated.info = try ServerInfo(from: info as! Decoder)
                    servers[index] = updated
                }
            } catch {
                print("❌ Failed to fetch server data: \(error)")
            }
        }
    }
    
    private func moveServer(from source: IndexSet, to destination: Int) {
        servers.move(fromOffsets: source, toOffset: destination)
        saveServerOrder()
    }
    
    private func saveServerOrder() {
        let ids = servers.map { $0.id.uuidString }
        UserDefaults.standard.set(ids, forKey: serverOrderKey)
    }
    
    private struct PingResponse: Codable {
        let response: String
    }
    
//    func pingServer(_ server: Server) async -> Bool {
//        let hostname = server.hostname
//        guard let url = URL(string: "https://\(hostname)/api/v2/ping") else {
//            return false
//        }
//
//        var request = URLRequest(url: url)
//        request.httpMethod = "GET"
//        request.timeoutInterval = 5
//        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
//
//        let apiKey = KeychainHelper.loadApiKey(for: hostname)?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
//        request.setValue(apiKey, forHTTPHeaderField: "X-API-KEY")
//
//        do {
//            let (data, response) = try await URLSession.shared.data(for: request)
//            if let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 {
//                do {
//                    let decoded = try JSONDecoder().decode(PingResponse.self, from: data)
//                    if decoded.response == "pong" {
//                        return true
//                    } else {
//                        print("❌ Unexpected response: \(decoded.response)")
//                        return false
//                    }
//                } catch {
//                    print("❌ Failed to decode JSON: \(error)")
//                    return false
//                }
//            } else {
//                return false
//            }
//        } catch {
//            print("[Ping] \(server.hostname): \(error.localizedDescription)")
//            return false
//        }
//    }
    
    func pingAllServers() {
        for (index, server) in servers.enumerated() {
            Task {
                let apiKey = KeychainHelper.loadApiKey(for: server.hostname)?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""

                let api = ServerAPI(hostname: server.hostname, apiKey: apiKey)
                let pingable = await api.ping()

                servers[index].pingable = pingable
                }
            }
        }
    }


#Preview {
    MainView()
}