import SwiftUI

struct MacRegistrationView: View {
    @Environment(WizardModel.self) private var model
    
    @State private var macInfo: MacDeviceInfo?
    @State private var isRegistering = false
    @State private var isInstallingProfile = false
    @State private var errorMessage: String?
    @State private var successMessage: String?
    @State private var profileInstalled = false
    @State private var checkingProfile = false
    
    var body: some View {
        VStack(spacing: 24) {
            Image(systemName: "desktopcomputer.and.arrow.down")
                .font(.system(size: 80))
                .foregroundStyle(.blue)
            
            Text("Mac für ReBreak Magic registrieren")
                .font(.title)
                .bold()
            
            Text("Bevor wir mit dem iPhone-Setup starten, muss dieser Mac registriert und geschützt werden.")
                .multilineTextAlignment(.center)
                .foregroundStyle(.secondary)
                .padding(.horizontal, 40)
            
            if let info = macInfo {
                macInfoCard(info)
            } else {
                ProgressView("Lese Mac-Informationen...")
                    .progressViewStyle(.circular)
            }
            
            if let error = errorMessage {
                errorCard(error)
            }
            
            if let success = successMessage {
                successCard(success)
            }
            
            if let registration = model.magicRegistration, profileInstalled {
                VStack(spacing: 12) {
                    HStack(spacing: 8) {
                        Image(systemName: "checkmark.shield.fill")
                            .foregroundStyle(.green)
                        Text("Mac erfolgreich geschützt")
                            .font(.headline)
                            .foregroundStyle(.green)
                    }
                    
                    VStack(alignment: .leading, spacing: 6) {
                        Text("✓ DNS-Filter-Profil installiert")
                        Text("✓ Device registriert: \(registration.deviceId.prefix(8))...")
                    }
                    .font(.caption)
                    .foregroundStyle(.secondary)
                    .frame(maxWidth: .infinity, alignment: .leading)
                }
                .padding()
                .background(Color.green.opacity(0.1))
                .cornerRadius(8)
                .frame(maxWidth: 400)
            }
            
            HStack(spacing: 12) {
                if model.magicRegistration == nil {
                    Button("Mac registrieren") { handleRegistration() }
                        .buttonStyle(.borderedProminent)
                        .disabled(isRegistering || macInfo == nil || isInstallingProfile)
                } else if !profileInstalled {
                    Button("DNS-Profil installieren") { handleProfileInstall() }
                        .buttonStyle(.borderedProminent)
                        .disabled(isInstallingProfile)
                } else {
                    Button("Weiter → iPhone-Setup") { model.advance() }
                        .buttonStyle(.borderedProminent)
                }
                
                if isRegistering || isInstallingProfile {
                    ProgressView()
                        .controlSize(.small)
                }
            }
        }
        .padding(40)
        .onAppear {
            loadMacInfo()
            checkProfileStatus()
        }
    }
    
    @ViewBuilder
    private func macInfoCard(_ info: MacDeviceInfo) -> some View {
        VStack(alignment: .leading, spacing: 8) {
            HStack {
                Image(systemName: "desktopcomputer")
                    .foregroundStyle(.blue)
                Text(info.hostname)
                    .font(.headline)
            }
            
            Text("\(info.model) · macOS \(info.osVersion)")
                .font(.callout)
                .foregroundStyle(.secondary)
            
            Text("Device-ID: \(info.deviceId.prefix(8))...\(info.deviceId.suffix(8))")
                .font(.system(.caption, design: .monospaced))
                .foregroundStyle(.tertiary)
        }
        .padding()
        .frame(maxWidth: 400, alignment: .leading)
        .background(Color.blue.opacity(0.08))
        .cornerRadius(8)
    }
    
    @ViewBuilder
    private func errorCard(_ error: String) -> some View {
        VStack(spacing: 8) {
            HStack(spacing: 8) {
                Image(systemName: "exclamationmark.triangle.fill")
                    .foregroundStyle(.red)
                Text(error)
                    .font(.callout)
                    .foregroundStyle(.red)
                    .multilineTextAlignment(.leading)
            }
            .frame(maxWidth: .infinity, alignment: .leading)
        }
        .padding()
        .background(Color.red.opacity(0.1))
        .cornerRadius(8)
        .frame(maxWidth: 400)
    }
    
    @ViewBuilder
    private func successCard(_ message: String) -> some View {
        HStack(spacing: 8) {
            Image(systemName: "checkmark.circle.fill")
                .foregroundStyle(.green)
            Text(message)
                .font(.callout)
                .foregroundStyle(.green)
        }
        .padding()
        .background(Color.green.opacity(0.1))
        .cornerRadius(8)
        .frame(maxWidth: 400)
    }
    
    private func loadMacInfo() {
        Task {
            do {
                let info = try MacDeviceDetector.detect()
                await MainActor.run {
                    macInfo = info
                }
            } catch {
                await MainActor.run {
                    errorMessage = "Mac-Info konnte nicht gelesen werden: \(error.localizedDescription)"
                }
            }
        }
    }
    
    private func checkProfileStatus() {
        Task {
            checkingProfile = true
            let installed = await MacProfileInstaller.isInstalled()
            await MainActor.run {
                profileInstalled = installed
                checkingProfile = false
            }
        }
    }
    
    private func handleRegistration() {
        Task {
            isRegistering = true
            errorMessage = nil
            successMessage = nil
            
            do {
                try await model.registerMac()
                
                await MainActor.run {
                    successMessage = "Mac erfolgreich registriert ✓"
                    isRegistering = false
                }
                
                // Auto-trigger profile install
                try await Task.sleep(nanoseconds: 500_000_000) // 0.5s delay
                await handleProfileInstall()
                
            } catch {
                await MainActor.run {
                    isRegistering = false
                    errorMessage = error.localizedDescription
                }
            }
        }
    }
    
    private func handleProfileInstall() {
        guard let registration = model.magicRegistration else {
            errorMessage = "Keine Registrierung vorhanden. Bitte zuerst registrieren."
            return
        }
        
        Task {
            isInstallingProfile = true
            errorMessage = nil
            
            do {
                try await MacProfileInstaller.downloadAndInstall(registration: registration)
                
                // Re-check profile status
                await checkProfileStatus()
                
                await MainActor.run {
                    isInstallingProfile = false
                    successMessage = "DNS-Filter-Profil installiert ✓"
                }
                
            } catch {
                await MainActor.run {
                    isInstallingProfile = false
                    errorMessage = "Profil-Installation fehlgeschlagen: \(error.localizedDescription)"
                }
            }
        }
    }
}

#Preview {
    MacRegistrationView()
        .environment(WizardModel())
        .frame(width: 720, height: 600)
}