import SwiftUI

struct MenuBarView: View {
    @Environment(TTLManager.self) private var ttlManager
    @Environment(\.openWindow) private var openWindow
    @Environment(\.colorScheme) private var colorScheme
    
    @State private var isProcessing = false
    @State private var showError = false
    @State private var errorMessage = ""
    
    private let authService = AuthenticationService()
    private let commandService = SystemCommandService()
    
    private var accentColor: Color {
        if colorScheme == .light {
            return ttlManager.isProtected
                ? Color(hue: 0.38, saturation: 0.85, brightness: 0.40)
                : Color(hue: 0.05, saturation: 0.90, brightness: 0.45)
        } else {
            return ttlManager.isProtected
                ? Color(hue: 0.38, saturation: 0.70, brightness: 0.85)
                : Color(hue: 0.06, saturation: 0.70, brightness: 0.90)
        }
    }
    
    var body: some View {
        VStack(spacing: 14) {
            // Header
            HStack(spacing: 10) {
                Image(systemName: ttlManager.isProtected ? "antenna.radiowaves.left.and.right" : "antenna.radiowaves.left.and.right.slash")
                    .font(.system(size: 20, weight: .medium))
                    .foregroundStyle(accentColor)
                    .symbolEffect(.bounce, value: ttlManager.isProtected)
                
                VStack(alignment: .leading, spacing: 2) {
                    Text("Tethering Hider")
                        .font(.system(size: 13, weight: .bold, design: .rounded))
                    
                    Text(ttlManager.isProtected ? "Protected (TTL 65)" : "Exposed (TTL 64)")
                        .font(.system(size: 11, weight: .medium))
                        .foregroundStyle(accentColor)
                }
                
                Spacer()
                
                // Toggle Switch
                Toggle("", isOn: Binding(
                    get: { ttlManager.isProtected },
                    set: { newValue in
                        if newValue {
                            activateProtection()
                        } else {
                            deactivateProtection()
                        }
                    }
                ))
                .toggleStyle(.switch)
                .disabled(isProcessing)
                .tint(accentColor)
            }
            .padding(.horizontal, 14)
            .padding(.vertical, 10)
            .background(
                RoundedRectangle(cornerRadius: 12)
                    .fill(.ultraThinMaterial)
                    .overlay(
                        RoundedRectangle(cornerRadius: 12)
                            .stroke(accentColor.opacity(0.2), lineWidth: 0.5)
                    )
            )
            .modifier(GlassCardModifier(tintColor: accentColor))
            
            // Status Badges
            HStack(spacing: 6) {
                badgeItem(title: "IPv4", val: "\(ttlManager.currentTTL)", active: ttlManager.currentTTL == 65)
                badgeItem(title: "IPv6", val: "\(ttlManager.currentIPv6HopLimit)", active: ttlManager.currentIPv6HopLimit == 65)
                badgeItem(title: "DNS", val: "FLUSH", active: ttlManager.isProtected)
            }
            
            Divider()
                .opacity(0.3)
            
            // Action Links
            VStack(spacing: 6) {
                Button {
                    NSApp.activate(ignoringOtherApps: true)
                    openWindow(id: "mainWindow")
                } label: {
                    Label("Open Dashboard", systemImage: "macwindow")
                        .font(.system(size: 12, weight: .medium))
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .contentShape(Rectangle())
                }
                .buttonStyle(.plain)
                .padding(.horizontal, 10)
                .padding(.vertical, 6)
                .background(RoundedRectangle(cornerRadius: 6).fill(Color.primary.opacity(0.05)))
                
                Button(role: .destructive) {
                    NSApp.terminate(nil)
                } label: {
                    Label("Quit Tethering Hider", systemImage: "power")
                        .font(.system(size: 12, weight: .medium))
                        .foregroundStyle(.red)
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .contentShape(Rectangle())
                }
                .buttonStyle(.plain)
                .padding(.horizontal, 10)
                .padding(.vertical, 6)
            }
        }
        .padding(14)
        .frame(width: 280)
        .alert("Error", isPresented: $showError) {
            Button("OK", role: .cancel) { }
        } message: {
            Text(errorMessage)
        }
        .task {
            ttlManager.refreshStatus()
        }
    }
    
    private func badgeItem(title: String, val: String, active: Bool) -> some View {
        HStack(spacing: 3) {
            Circle()
                .fill(active ? Color.green : Color.orange)
                .frame(width: 4, height: 4)
            Text("\(title): \(val)")
                .font(.system(size: 9, weight: .medium, design: .monospaced))
                .foregroundStyle(.secondary)
        }
        .padding(.horizontal, 6)
        .padding(.vertical, 3)
        .background(Capsule().fill(.ultraThinMaterial))
    }
    
    private func activateProtection() {
        Task {
            isProcessing = true
            defer { isProcessing = false }
            
            do {
                let authenticated = try await authService.authenticateWithBiometrics()
                guard authenticated else { return }
                
                try await commandService.setTTL(ttlManager.targetTTL)
                ttlManager.didSetTTL(ttlManager.targetTTL)
            } catch is AuthenticationError {
            } catch SystemCommandError.userCancelledAuth {
            } catch {
                errorMessage = error.localizedDescription
                showError = true
                ttlManager.setError(error.localizedDescription)
            }
        }
    }
    
    private func deactivateProtection() {
        Task {
            isProcessing = true
            defer { isProcessing = false }
            
            do {
                let authenticated = try await authService.authenticateWithBiometrics()
                guard authenticated else { return }
                
                try await commandService.resetTTL()
                ttlManager.didSetTTL(ttlManager.defaultTTL)
            } catch is AuthenticationError {
            } catch SystemCommandError.userCancelledAuth {
            } catch {
                errorMessage = error.localizedDescription
                showError = true
                ttlManager.setError(error.localizedDescription)
            }
        }
    }
}