//
//  PaywallView.swift
//  SportsTime
//
//  Full-screen paywall for Pro subscription using SubscriptionStoreView.
//

import SwiftUI
import StoreKit

struct PaywallView: View {
    @Environment(\.dismiss) private var dismiss
    @Environment(\.colorScheme) private var colorScheme

    private let storeManager = StoreManager.shared
    let source: String

    init(source: String = "unknown") {
        self.source = source
    }

    var body: some View {
        SubscriptionStoreView(subscriptions: storeManager.products.filter { $0.subscription != nil }) {
            VStack(spacing: 0) {
                // Hero section
                VStack(spacing: Theme.Spacing.sm) {
                    Image(systemName: "shield.lefthalf.filled.badge.checkmark")
                        .font(.system(size: 28))
                        .foregroundStyle(Theme.warmOrange)
                        .accessibilityHidden(true)

                    Text("SportsTime Pro")
                        .font(.title2.bold())
                        .foregroundStyle(Theme.textPrimary(colorScheme))
                        .accessibilityIdentifier("paywall.title")

                    Text("Your All-Access Pass")
                        .font(.subheadline)
                        .foregroundStyle(Theme.textSecondary(colorScheme))
                }
                .padding(.vertical, Theme.Spacing.xl)
                .frame(maxWidth: .infinity)
                .background(
                    RoundedRectangle(cornerRadius: Theme.CornerRadius.large)
                        .fill(Theme.warmOrange.opacity(0.06))
                )
                .padding(.horizontal, Theme.Spacing.md)

                // Feature grid — GeometryReader to make all cards identical squares
                GeometryReader { geo in
                    let spacing = Theme.Spacing.sm
                    let hPadding = Theme.Spacing.md * 2
                    let cardSize = (geo.size.width - hPadding - spacing * 3) / 4

                    HStack(spacing: spacing) {
                        featureCard(icon: "infinity", label: "Unlimited\nTrips", size: cardSize)
                        featureCard(icon: "doc.text.fill", label: "PDF\nExport", size: cardSize)
                        featureCard(icon: "building.2.fill", label: "Stadium\nTracking", size: cardSize)
                        featureCard(icon: "trophy.fill", label: "Achieve-\nments", size: cardSize)
                    }
                    .padding(.horizontal, Theme.Spacing.md)
                }
                .frame(height: 90)
                .padding(.top, Theme.Spacing.md)

                // Dashed ticket perforation separator
                Line()
                    .stroke(style: StrokeStyle(lineWidth: 1.5, dash: [6, 4]))
                    .foregroundStyle(Theme.textMuted(colorScheme).opacity(0.6))
                    .frame(height: 1)
                    .padding(.horizontal, Theme.Spacing.lg)
                    .padding(.top, Theme.Spacing.lg)
                    .padding(.bottom, Theme.Spacing.sm)
            }
        }
        .storeButton(.visible, for: .restorePurchases)
        .storeButton(.visible, for: .redeemCode)
        .subscriptionStoreControlStyle(.prominentPicker)
        .subscriptionStoreButtonLabel(.displayName.multiline)
        .onInAppPurchaseStart { product in
            AnalyticsManager.shared.trackPurchaseStarted(productId: product.id, source: source)
        }
        .onInAppPurchaseCompletion { product, result in
            switch result {
            case .success(.success(_)):
                AnalyticsManager.shared.trackPurchaseCompleted(productId: product.id, source: source)
                Task { @MainActor in
                    await storeManager.updateEntitlements()
                    storeManager.trackSubscriptionAnalytics(source: "purchase_success")
                }
                dismiss()
            case .success(.userCancelled):
                AnalyticsManager.shared.trackPurchaseFailed(productId: product.id, source: source, error: "user_cancelled")
            case .success(.pending):
                AnalyticsManager.shared.trackPurchaseFailed(productId: product.id, source: source, error: "pending")
            case .failure(let error):
                AnalyticsManager.shared.trackPurchaseFailed(productId: product.id, source: source, error: error.localizedDescription)
            @unknown default:
                AnalyticsManager.shared.trackPurchaseFailed(productId: product.id, source: source, error: "unknown_result")
            }
        }
        .task {
            await storeManager.loadProducts()
        }
        .onAppear {
            AnalyticsManager.shared.trackPaywallViewed(source: source)
        }
    }

    // MARK: - Feature Card

    private func featureCard(icon: String, label: String, size: CGFloat) -> some View {
        VStack(spacing: 4) {
            Image(systemName: icon)
                .font(.system(size: 18))
                .foregroundStyle(Theme.warmOrange)
                .accessibilityHidden(true)

            Text(label)
                .font(.system(size: 10, weight: .medium))
                .multilineTextAlignment(.center)
                .foregroundStyle(Theme.textSecondary(colorScheme))
                .lineLimit(2)
                .minimumScaleFactor(0.8)
        }
        .accessibilityElement(children: .combine)
        .frame(width: size, height: size)
        .background(
            RoundedRectangle(cornerRadius: Theme.CornerRadius.small)
                .fill(Theme.warmOrange.opacity(0.08))
                .overlay(
                    RoundedRectangle(cornerRadius: Theme.CornerRadius.small)
                        .strokeBorder(Theme.warmOrange.opacity(0.15), lineWidth: 1)
                )
        )
    }
}

// MARK: - Dashed Line Shape

private struct Line: Shape {
    func path(in rect: CGRect) -> Path {
        var path = Path()
        path.move(to: CGPoint(x: 0, y: rect.midY))
        path.addLine(to: CGPoint(x: rect.maxX, y: rect.midY))
        return path
    }
}

#Preview {
    PaywallView()
}