//
//  PurchaseButtonView.swift
//  Feels
//
//  Subscription status and purchase view for settings.
//

import SwiftUI
import StoreKit

struct PurchaseButtonView: View {
    @AppStorage(UserDefaultsStore.Keys.theme.rawValue, store: GroupUserDefaults.groupDefaults) private var theme: Theme = .system
    @AppStorage(UserDefaultsStore.Keys.textColor.rawValue, store: GroupUserDefaults.groupDefaults) private var textColor: Color = DefaultTextColor.textColor

    @ObservedObject var iapManager: IAPManager

    @State private var showSubscriptionStore = false
    @State private var showManageSubscriptions = false

    var body: some View {
        VStack(spacing: 16) {
            if iapManager.isLoading {
                loadingView
            } else if iapManager.isSubscribed {
                subscribedView
            } else {
                notSubscribedView
            }
        }
        .padding()
        .background(theme.currentTheme.secondaryBGColor)
        .cornerRadius(10)
        .sheet(isPresented: $showSubscriptionStore) {
            FeelsSubscriptionStoreView()
        }
        .manageSubscriptionsSheet(isPresented: $showManageSubscriptions)
    }

    // MARK: - Loading View

    private var loadingView: some View {
        VStack(spacing: 12) {
            ProgressView()
            Text(String(localized: "purchase_view_loading"))
                .font(.body)
                .foregroundColor(textColor)
        }
        .frame(maxWidth: .infinity)
        .padding()
    }

    // MARK: - Subscribed View

    private var subscribedView: some View {
        VStack(alignment: .leading, spacing: 12) {
            Text(String(localized: "purchase_view_current_subscription"))
                .font(.title3)
                .bold()
                .foregroundColor(textColor)

            if let product = iapManager.currentProduct {
                HStack {
                    VStack(alignment: .leading, spacing: 4) {
                        Text(product.displayName)
                            .font(.headline)
                            .foregroundColor(textColor)
                        Text(product.displayPrice)
                            .font(.subheadline)
                            .foregroundColor(.secondary)
                    }

                    Spacer()

                    subscriptionStatusBadge
                }
            }

            Divider()

            // Manage subscription button
            Button {
                showManageSubscriptions = true
            } label: {
                Text(String(localized: "purchase_view_manage_subscription"))
                    .font(.body)
                    .foregroundColor(.blue)
                    .frame(maxWidth: .infinity)
            }

            // Show other subscription options
            if iapManager.sortedProducts.count > 1 {
                Button {
                    showSubscriptionStore = true
                } label: {
                    Text(String(localized: "purchase_view_change_plan"))
                        .font(.body)
                        .foregroundColor(.secondary)
                        .frame(maxWidth: .infinity)
                }
            }
        }
    }

    private var subscriptionStatusBadge: some View {
        Group {
            if case .subscribed(_, let willAutoRenew) = iapManager.state {
                if willAutoRenew {
                    Text(String(localized: "subscription_status_active"))
                        .font(.caption)
                        .foregroundColor(.white)
                        .padding(.horizontal, 8)
                        .padding(.vertical, 4)
                        .background(Color.green)
                        .cornerRadius(4)
                } else {
                    Text(String(localized: "subscription_status_expires"))
                        .font(.caption)
                        .foregroundColor(.white)
                        .padding(.horizontal, 8)
                        .padding(.vertical, 4)
                        .background(Color.orange)
                        .cornerRadius(4)
                }
            }
        }
    }

    // MARK: - Not Subscribed View

    private var notSubscribedView: some View {
        VStack(spacing: 16) {
            Text(String(localized: "purchase_view_title"))
                .font(.title3)
                .bold()
                .foregroundColor(textColor)
                .frame(maxWidth: .infinity, alignment: .leading)

            // Trial status
            if iapManager.shouldShowTrialWarning {
                trialStatusView
            } else if iapManager.shouldShowPaywall {
                Text(String(localized: "purchase_view_trial_expired"))
                    .font(.body)
                    .foregroundColor(.secondary)
            }

            Text(String(localized: "purchase_view_current_why_subscribe"))
                .font(.body)
                .foregroundColor(.secondary)
                .multilineTextAlignment(.center)

            // Subscribe button
            Button {
                showSubscriptionStore = true
            } label: {
                Text(String(localized: "purchase_view_subscribe_button"))
                    .font(.headline)
                    .foregroundColor(.white)
                    .frame(maxWidth: .infinity)
                    .padding()
                    .background(Color.pink)
                    .cornerRadius(10)
            }

            // Restore purchases
            Button {
                Task {
                    await iapManager.restore()
                }
            } label: {
                Text(String(localized: "purchase_view_restore"))
                    .font(.body)
                    .foregroundColor(.blue)
            }
        }
    }

    private var trialStatusView: some View {
        HStack {
            Image(systemName: "clock")
                .foregroundColor(.orange)

            if let expirationDate = iapManager.trialExpirationDate {
                Text(String(localized: "purchase_view_trial_expires_in"))
                    .foregroundColor(textColor)
                +
                Text(" ")
                +
                Text(expirationDate, style: .relative)
                    .foregroundColor(.orange)
                    .bold()
            }
        }
        .font(.body)
    }
}

#Preview {
    PurchaseButtonView(iapManager: IAPManager())
}