app_for_reddit/App AI for Reddit/Models/PaywallModels.swift

import Foundation
import StoreKit

struct PaywallTrialDisplay: Equatable, Sendable {
    let badgeText: String
    let durationLowercased: String
    let ctaText: String

    static func from(offer: Product.SubscriptionOffer, config: PaywallConfig) -> PaywallTrialDisplay {
        let duration = config.trialDurationDescription(from: offer)
        let durationLowercased = config.trialDurationDescription(from: offer, lowercase: true)
        return PaywallTrialDisplay(
            badgeText: config.trialBadgeText(from: offer),
            durationLowercased: durationLowercased,
            ctaText: config.trialCTATitle(from: offer)
        )
    }

    static func from(fallback: PaywallConfig.TrialFallbackDuration, config: PaywallConfig) -> PaywallTrialDisplay? {
        guard let duration = config.trialDurationDescription(from: fallback),
              let durationLowercased = config.trialDurationDescription(from: fallback, lowercase: true) else {
            return nil
        }
        return PaywallTrialDisplay(
            badgeText: config.trialBadgeText(duration: duration),
            durationLowercased: durationLowercased,
            ctaText: config.trialCTATitle(duration: duration)
        )
    }
}

struct PaywallPlan: Identifiable, Hashable, Sendable {
    let productID: String

    var id: String { productID }

    var planKey: String {
        SubscriptionProductID.planKey(for: productID)
    }

    init(productID: String) {
        self.productID = productID
    }

    static func from(rawValue: String) -> PaywallPlan? {
        if rawValue.contains(".") {
            return PaywallPlan(productID: rawValue)
        }

        switch rawValue {
        case "monthly": return PaywallPlan(productID: SubscriptionProductID.monthly)
        case "yearly": return PaywallPlan(productID: SubscriptionProductID.yearly)
        case "lifetime": return PaywallPlan(productID: SubscriptionProductID.lifetime)
        default: return nil
        }
    }

    func planCopy(from config: PaywallConfig, product: Product? = nil) -> PaywallConfig.PlanCopy {
        if let configured = config.plans.planCopy(for: planKey) {
            return configured
        }
        if let product {
            return config.generatedPlanCopy(for: product)
        }
        return config.fallbackPlanCopy
    }

    func localizedPrice(from product: Product?, config: PaywallConfig) -> String {
        product?.displayPrice ?? planCopy(from: config, product: product).fallbackPrice
    }

    func localizedSubtitle(
        from product: Product?,
        config: PaywallConfig,
        trial: PaywallTrialDisplay? = nil
    ) -> String {
        guard let product else { return "" }
        let copy = planCopy(from: config, product: product)
        if let trial, let template = copy.trialSubtitleTemplate {
            return template
                .replacingOccurrences(of: "{price}", with: product.displayPrice)
                .replacingOccurrences(of: "{trial}", with: trial.durationLowercased)
        }
        return copy.subtitleTemplate.replacingOccurrences(of: "{price}", with: product.displayPrice)
    }

    func localizedCTATitle(
        from product: Product?,
        config: PaywallConfig,
        trial: PaywallTrialDisplay? = nil
    ) -> String {
        guard let product else { return config.loadingCTA }
        if let trial {
            return trial.ctaText
        }
        let copy = planCopy(from: config, product: product)
        return copy.ctaTemplate.replacingOccurrences(of: "{price}", with: product.displayPrice)
    }

    func localizedRenewalDisclosure(
        from product: Product?,
        config: PaywallConfig,
        trial: PaywallTrialDisplay? = nil
    ) -> String {
        if product?.type == .nonConsumable {
            return config.lifetimeDisclosure
        }

        guard let product else { return config.loadingDisclosure }
        let price = product.displayPrice
        let period = product.subscription.map {
            config.subscriptionPeriodDescription(from: $0.subscriptionPeriod)
        } ?? config.messages.periodFallback

        if let trial {
            return config.trialDisclosureTemplate
                .replacingOccurrences(of: "{trial}", with: trial.durationLowercased)
                .replacingOccurrences(of: "{price}", with: price)
                .replacingOccurrences(of: "{period}", with: period)
        }

        return config.subscriptionDisclosureTemplate
            .replacingOccurrences(of: "{price}", with: price)
            .replacingOccurrences(of: "{period}", with: period)
    }

    func fallbackBillingDescription(config: PaywallConfig, product: Product? = nil) -> String {
        let copy = planCopy(from: config, product: product)
        return copy.fallbackBillingDescription
            .replacingOccurrences(of: "{price}", with: copy.fallbackPrice)
    }

    var isLifetime: Bool {
        productID == SubscriptionProductID.lifetime
    }
}

extension PaywallPlan {
    static func sortOrder(_ lhs: PaywallPlan, _ rhs: PaywallPlan) -> Bool {
        let order = [
            SubscriptionProductID.monthly,
            SubscriptionProductID.yearly,
            SubscriptionProductID.lifetime,
        ]
        let leftIndex = order.firstIndex(of: lhs.productID) ?? Int.max
        let rightIndex = order.firstIndex(of: rhs.productID) ?? Int.max
        if leftIndex != rightIndex {
            return leftIndex < rightIndex
        }
        return lhs.productID < rhs.productID
    }
}