import AppKit
import SwiftUI

struct ContentView: View {
    @Environment(WizardModel.self) private var model
    @State private var showingHelp = false

    var body: some View {
        Group {
            if model.showingLogin {
                LoginView { session in
                    model.handleLogin(session: session)
                }
            } else if model.showingHub {
                DeviceHubView()
            } else {
                mainWizardView
            }
        }
        .sheet(isPresented: Binding(
            get: { model.showingManageBindings },
            set: { model.showingManageBindings = $0 }
        )) {
            ManageBindingsView {
                model.showingManageBindings = false
            }
        }
    }
    
    @ViewBuilder
    private var mainWizardView: some View {
        VStack(spacing: 0) {
            VStack(spacing: 8) {
                HStack {
                    appBadge

                    VStack(alignment: .leading, spacing: 1) {
                        Text("Rebreak Magic")
                            .font(.headline)
                        Text("iPhone bind ohne Werks-Reset")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                    }
                    Spacer()
                    
                    // Back to Hub
                    Button(action: { model.returnToHub() }) {
                        Image(systemName: "rectangle.grid.2x2")
                            .font(.title3)
                            .foregroundStyle(.secondary)
                    }
                    .buttonStyle(.plain)
                    .help("Zur Geräte-Übersicht")
                    .padding(.trailing, 4)

                    // Help-Button
                    Button(action: { showingHelp = true }) {
                        Image(systemName: "questionmark.circle")
                            .font(.title3)
                            .foregroundStyle(.secondary)
                    }
                    .buttonStyle(.plain)
                    .help("Hilfe & FAQ (⌘?)")
                    .keyboardShortcut("?", modifiers: .command)
                    
                    if model.step != .done && model.step != .macRegistration {
                        Text("Schritt \(model.step.stepNumber - 1) von \(WizardStep.total - 1)")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                            .padding(.leading, 12)
                    }
                }
                .padding(.horizontal, 20)
                .padding(.top, 16)

                StepIndicator(current: model.step)
            }
            .background(Color(NSColor.windowBackgroundColor))

            Divider()

            // Main content
            Group {
                switch model.step {
                case .macRegistration: MacRegistrationView()
                case .welcome:   WelcomeView()
                case .preflight: PreflightView()
                case .supervise: SuperviseView()
                case .enroll:    EnrollView()
                case .configure: ConfigureView()
                case .done:      DoneView()
                }
            }
            .frame(maxWidth: .infinity, maxHeight: .infinity)
        }
        .sheet(isPresented: $showingHelp) {
            HelpView()
        }
    }

    @ViewBuilder
    private var appBadge: some View {
        if let icon = resolvedAppIcon {
            Image(nsImage: icon)
                .resizable()
                .frame(width: 28, height: 28)
                .clipShape(RoundedRectangle(cornerRadius: 7, style: .continuous))
                .overlay(
                    RoundedRectangle(cornerRadius: 7, style: .continuous)
                        .strokeBorder(.white.opacity(0.25), lineWidth: 1)
                )
        } else {
            ZStack {
                RoundedRectangle(cornerRadius: 7, style: .continuous)
                    .fill(Color.accentColor.opacity(0.15))
                Image(systemName: "shield.lefthalf.filled")
                    .foregroundStyle(.tint)
            }
            .frame(width: 28, height: 28)
        }
    }

    private var resolvedAppIcon: NSImage? {
        if let icon = NSApplication.shared.applicationIconImage,
           icon.size.width > 2,
           icon.size.height > 2 {
            return icon
        }
        let bundleIcon = NSWorkspace.shared.icon(forFile: Bundle.main.bundlePath)
        if bundleIcon.size.width > 2, bundleIcon.size.height > 2 {
            return bundleIcon
        }
        return nil
    }
}
