Group and Organization Subscriptions

import SwiftUI
import StoreKit

struct TeamSubscriptionView: View {
    let product: Product
    @State private var seatCount: Int = 5
    @State private var purchaseError: String?
    @State private var purchaseResult: Product.PurchaseResult?
    @State private var isPurchasing = false

    var body: some View {
        VStack(spacing: 24) {
            Text("Subscribe Your Team")
                .font(.title2.bold())

            Stepper("Seats: \(seatCount)", value: $seatCount, in: 2...100)
                .padding(.horizontal)

            if let priceString = formattedPrice {
                Text("Total: \(priceString) / month")
                    .foregroundStyle(.secondary)
            }

            Button {
                Task { await purchaseForGroup() }
            } label: {
                Group {
                    if isPurchasing {
                        ProgressView()
                    } else {
                        Text("Buy \(seatCount) Seats")
                    }
                }
                .frame(maxWidth: .infinity)
                .padding()
                .background(.blue)
                .foregroundStyle(.white)
                .clipShape(RoundedRectangle(cornerRadius: 12))
            }
            .disabled(isPurchasing)
            .padding(.horizontal)

            if let error = purchaseError {
                Text(error).foregroundStyle(.red).font(.caption)
            }
        }
        .padding()
    }

    var formattedPrice: String? {
        let total = product.price * Decimal(seatCount)
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        formatter.locale = product.priceFormatStyle.locale
        return formatter.string(from: total as NSDecimalNumber)
    }

    func purchaseForGroup() async {
        isPurchasing = true
        purchaseError = nil
        defer { isPurchasing = false }

        do {
            // Pass quantity for the group purchase; Apple generates the invite link
            let result = try await product.purchase(
                options: [.quantity(seatCount)]
            )
            purchaseResult = result
            switch result {
            case .success(let verification):
                let transaction = try verification.payloadValue
                // Apple's included seat management takes over:
                // invite link is generated and surfaced to the purchaser.
                await transaction.finish()
            case .pending:
                break
            case .userCancelled:
                break
            @unknown default:
                break
            }
        } catch {
            purchaseError = error.localizedDescription
        }
    }
}

// MARK: - Preview
#Preview {
    // Wrap in a StoreKit configuration for Xcode previews
    Text("Load a StoreKit product to preview TeamSubscriptionView")
}