// ContentView.swift

import SwiftUI
import UIKit

struct ContentView: View {
    @EnvironmentObject private var auth: AuthManager
    @EnvironmentObject private var sync: SyncManager
    @StateObject private var updateChecker = UpdateChecker.shared

    var body: some View {
        Group {
            if auth.isLoading && !auth.isAuthenticated {
                VStack(spacing: 16) {
                    Image(systemName: "checkmark.seal.fill")
                        .font(.system(size: 64))
                        .foregroundStyle(.blue)
                    ProgressView("Loading…")
                }
            } else if auth.isAuthenticated {
                DashboardView()
            } else {
                LoginView()
            }
        }
        .animation(.easeInOut(duration: 0.3), value: auth.isAuthenticated)
        .task {
            // 1. Restore session first — sets isAuthenticated and loads tokens.
            await AuthManager.shared.restoreSession()
            // 2. Only start network monitoring AFTER auth is resolved.
            //    startMonitoring() fires triggerSync() immediately on connectivity,
            //    so it must not run before tokens are in place.
            SyncManager.shared.startMonitoring()
            // 3. If already online and authenticated, do an initial sync.
            if SyncManager.shared.isOnline && AuthManager.shared.isAuthenticated {
                await SyncManager.shared.triggerSync()
            }
            // 4. Check the App Store for a newer version. Independent of auth —
            //    runs even on the login screen so unauthenticated devices still
            //    get prompted. Throttled internally to once per 24h; silent on
            //    any failure (offline, parse error, etc.) so it never disrupts
            //    normal app use.
            await updateChecker.checkForUpdate()
        }
        .alert("Update Available", isPresented: $updateChecker.updateAvailable) {
            Button("Update") {
                if let url = updateChecker.appStoreURL {
                    UIApplication.shared.open(url)
                }
            }
            Button("Later", role: .cancel) {
                updateChecker.dismissForNow()
            }
        } message: {
            if let version = updateChecker.latestVersion {
                Text("Version \(version) is available on the App Store. Update now for the latest fixes and features.")
            } else {
                Text("A new version is available on the App Store.")
            }
        }
    }
}