import SwiftUI

struct BottomPromoBanner: View {
    let settings: AppSettings
    @State private var showRemoveAdsPromo: Bool = false
    @State private var showPremium = false

    private static let counterKey = "com.mealmood.bottomBannerRotation"
    private static let rotationInterval = 4

    var body: some View {
        Group {
            if showRemoveAdsPromo {
                removeAdsPromo
            } else {
                AdBannerView()
            }
        }
        .onAppear(perform: decideRotation)
        .sheet(isPresented: $showPremium) {
            NavigationStack { PremiumView(settings: settings, source: "ad_replacement") }
        }
    }

    private var removeAdsPromo: some View {
        VStack(spacing: 0) {
            Rectangle()
                .fill(Color.mealMoodTextSecondary.opacity(0.22))
                .frame(height: 1)

            Button {
                showPremium = true
            } label: {
                HStack(spacing: 10) {
                    Image(systemName: "star.fill")
                        .foregroundColor(.mealMoodCoral)
                    VStack(alignment: .leading, spacing: 1) {
                        Text("remove_ads_promo_title")
                            .font(.mealMoodSmall.weight(.semibold))
                            .foregroundColor(.mealMoodTextPrimary)
                        Text("remove_ads_promo_subtitle")
                            .font(.mealMoodCaption)
                            .foregroundColor(.mealMoodTextSecondary)
                    }
                    Spacer()
                    Text("remove_ads_promo_cta")
                        .font(.mealMoodCaption.weight(.semibold))
                        .foregroundColor(.white)
                        .padding(.horizontal, 12)
                        .padding(.vertical, 6)
                        .background(Color.mealMoodCoral)
                        .clipShape(Capsule())
                }
                .padding(.horizontal, 14)
            }
            .buttonStyle(.plain)
            .frame(maxWidth: .infinity, minHeight: 56)
            .background(Color.mealMoodSurface)
        }
        .frame(maxWidth: .infinity)
        .background(Color.mealMoodSurface)
    }

    private func decideRotation() {
        let current = UserDefaults.standard.integer(forKey: Self.counterKey)
        let next = current + 1
        UserDefaults.standard.set(next, forKey: Self.counterKey)
        showRemoveAdsPromo = (next % Self.rotationInterval == 0)
    }
}