import SwiftUI

struct LeadDetailHeaderView: View {
    let detail: LeadDetail
    let canStartAR: Bool
    let onStartAR: () -> Void
    @Environment(\.openURL) private var openURL
    @Environment(\.dynamicTypeSize) private var dynamicTypeSize
    @State private var actionUnavailable = false

    var body: some View {
        let layout = dynamicTypeSize.isAccessibilitySize
            ? AnyLayout(VStackLayout(alignment: .leading, spacing: 16))
            : AnyLayout(HStackLayout(spacing: 20))
        layout {
            HStack(spacing: 18) {
                Text(detail.initials)
                    .font(.title2.weight(.medium))
                    .frame(width: 64, height: 64)
                    .background(.gray.gradient, in: .circle)
                    .foregroundStyle(.white)
                    .accessibilityHidden(true)
                VStack(alignment: .leading, spacing: 6) {
                    Text(detail.lead.displayName).font(.title.bold())
                    Text("\(detail.lead.id) · \(detail.customerType) · \(detail.lead.address.city)")
                        .font(.subheadline).foregroundStyle(.secondary)
                }
            }
            Spacer(minLength: 0)
            HStack(spacing: 24) {
                HStack(spacing: 8) {
                    action("Anrufen", icon: "phone.fill", url: detail.phoneURL)
                    action("E-Mail", icon: "envelope.fill", url: detail.emailURL)
                    action("Route", icon: "location.fill", url: detail.routeURL)
                }
                Button(action: onStartAR) {
                    VStack(spacing: 8) {
                        Image(systemName: "arkit").font(.title3)
                        Text("AR").font(.caption)
                    }
                    .frame(minWidth: 60, minHeight: 56)
                    .padding(6)
                    .foregroundStyle(.white)
                    .background(LeadDetailStyle.blue, in: .rect(cornerRadius: 14))
                }
                .buttonStyle(.plain)
                .opacity(canStartAR ? 1 : 0.5)
                .disabled(!canStartAR)
                .accessibilityLabel("AR-Modus starten")
            }
        }
        .alert("Aktion nicht verfügbar", isPresented: $actionUnavailable) {
            Button("OK", role: .cancel) {}
        } message: {
            Text("Auf diesem Gerät ist keine passende App für diese Aktion verfügbar.")
        }
    }

    private func action(_ title: LocalizedStringKey, icon: String, url: URL?) -> some View {
        Button {
            guard let url else { return }
            openURL(url) { accepted in actionUnavailable = !accepted }
        } label: {
            VStack(spacing: 8) {
                Image(systemName: icon).font(.title3)
                Text(title).font(.caption)
            }
            .frame(minWidth: 60, minHeight: 56)
            .padding(6)
            .background(LeadDetailStyle.card, in: .rect(cornerRadius: 14))
        }
        .disabled(url == nil)
    }
}