SilverApple/SilverApple/Onboarding/Views/MDMEnrollmentView.swift

import SwiftUI
import SafariServices

struct MDMEnrollmentView: View {
    var onComplete: () -> Void
    @EnvironmentObject var env: AppEnvironment
    @State private var isLoading    = false
    @State private var showSafari   = false
    @State private var enrollUrl:    URL?
    @State private var error:        String?
    @State private var didEnroll    = false

    var body: some View {
        ScrollView {
            VStack(spacing: 32) {
                Image(systemName: "iphone.badge.play")
                    .font(.system(size: 56))
                    .foregroundStyle(.accentColor)

                VStack(spacing: 12) {
                    Text("Device Management")
                        .font(.title2.weight(.semibold))

                    Text("SilverApple uses Apple MDM to automatically configure your device — installing VPN, DNS, and account profiles without manual setup.")
                        .font(.subheadline)
                        .foregroundStyle(.secondary)
                        .multilineTextAlignment(.center)

                    Text("You remain in control: you can remove MDM enrollment at any time in Settings → General → VPN & Device Management.")
                        .font(.caption)
                        .foregroundStyle(.tertiary)
                        .multilineTextAlignment(.center)
                        .padding(.top, 4)
                }

                VStack(alignment: .leading, spacing: 12) {
                    FeatureRow(icon: "lock.shield", text: "Privacy hardening profiles")
                    FeatureRow(icon: "network",     text: "SilverVPN configuration")
                    FeatureRow(icon: "globe",        text: "Encrypted DNS via Technitium")
                    FeatureRow(icon: "envelope",     text: "Mailcow email account")
                    FeatureRow(icon: "calendar",     text: "CalDAV calendar sync")
                    FeatureRow(icon: "person.crop.rectangle", text: "CardDAV contacts sync")
                }
                .padding()
                .background(.secondary.opacity(0.08), in: RoundedRectangle(cornerRadius: 12))

                if let error {
                    Text(error).font(.caption).foregroundStyle(.red).multilineTextAlignment(.center)
                }

                VStack(spacing: 12) {
                    Button {
                        Task { await startEnrollment() }
                    } label: {
                        Group {
                            if isLoading { ProgressView() }
                            else { Label("Enroll this Device", systemImage: "checkmark.shield.fill") }
                        }
                        .frame(maxWidth: .infinity).padding()
                    }
                    .buttonStyle(.borderedProminent)
                    .disabled(isLoading || didEnroll)

                    if didEnroll {
                        Button("Continue →", action: onComplete)
                            .buttonStyle(.bordered)
                    }

                    Button("Skip for now") { onComplete() }
                        .foregroundStyle(.secondary)
                        .font(.caption)
                }
            }
            .padding(24)
        }
        .sheet(isPresented: $showSafari) {
            if let url = enrollUrl {
                SafariView(url: url)
                    .ignoresSafeArea()
                    .onDisappear { didEnroll = true }
            }
        }
    }

    private func startEnrollment() async {
        isLoading = true; error = nil
        do {
            let response = try await env.apiClient.getEnrollmentToken()
            enrollUrl    = URL(string: response.enrollmentUrl)
            showSafari   = true
        } catch {
            self.error = error.localizedDescription
        }
        isLoading = false
    }
}

struct FeatureRow: View {
    let icon: String
    let text: String
    var body: some View {
        Label(text, systemImage: icon)
            .font(.subheadline)
            .foregroundStyle(.primary)
    }
}

/// UIViewControllerRepresentable wrapper for SFSafariViewController
struct SafariView: UIViewControllerRepresentable {
    let url: URL
    func makeUIViewController(context: Context) -> SFSafariViewController {
        SFSafariViewController(url: url)
    }
    func updateUIViewController(_ vc: SFSafariViewController, context: Context) {}
}