import StoreKit
import UIKit

final class ReviewPromptService {
    static let shared = ReviewPromptService()

    private let lastPromptKey = "reviewPromptLastDate"
    private let checkInCountKey = "reviewPromptCheckinCount"
    private let minCheckInsBetweenPrompts = 3
    private let minDaysBetweenPrompts = 90

    private init() {}

    func recordMonthlyCheckInCompleted() {
        let currentCount = UserDefaults.standard.integer(forKey: checkInCountKey)
        UserDefaults.standard.set(currentCount + 1, forKey: checkInCountKey)
        requestReviewIfEligible()
    }

    private func requestReviewIfEligible() {
        let now = Date()
        if let lastPrompt = UserDefaults.standard.object(forKey: lastPromptKey) as? Date {
            let daysSince = now.timeIntervalSince(lastPrompt) / 86_400
            if daysSince < Double(minDaysBetweenPrompts) {
                return
            }
        }

        let count = UserDefaults.standard.integer(forKey: checkInCountKey)
        guard count >= minCheckInsBetweenPrompts else { return }

        requestReview()
    }

    private func requestReview() {
        guard let scene = UIApplication.shared.connectedScenes.first as? UIWindowScene else { return }
        if #available(iOS 18.0, *) {
            AppStore.requestReview(in: scene)
        } else {
            SKStoreReviewController.requestReview(in: scene)
        }
        UserDefaults.standard.set(Date(), forKey: lastPromptKey)
        UserDefaults.standard.set(0, forKey: checkInCountKey)
    }
}