import AppKit
import WebKit

@MainActor
final class RedditWebViewStore {
    static let shared = RedditWebViewStore()

    private(set) var container: RedditWebViewContainer?
    private var isWindowMinimized = false
    private var isRedditPageActive = false
    private var isPaywallPresented = false
    private var isAwaitingReturnFromSubscriptionManagement = false
    private var isMediaPlaybackSuspended = false

    private init() {}

    func containerIfNeeded() -> RedditWebViewContainer {
        if let container {
            return container
        }

        let webView = RedditWebViewManager.makeWebView()
        let newContainer = RedditWebViewContainer(webView: webView)
        container = newContainer
        updateMediaPlaybackSuspension()
        return newContainer
    }

    func setRedditPageActive(_ active: Bool) {
        isRedditPageActive = active
        updateMediaPlaybackSuspension()
    }

    func setPaywallPresented(_ presented: Bool) {
        isPaywallPresented = presented
        updateMediaPlaybackSuspension()
    }

    func suspendForSubscriptionManagement() {
        isAwaitingReturnFromSubscriptionManagement = true
        updateMediaPlaybackSuspension()
    }

    func handleApplicationDidBecomeActive() {
        guard isAwaitingReturnFromSubscriptionManagement else { return }
        isAwaitingReturnFromSubscriptionManagement = false
        updateMediaPlaybackSuspension()
    }

    func suspendMediaPlaybackForWindowMinimize() {
        isWindowMinimized = true
        updateMediaPlaybackSuspension()
    }

    func resumeMediaPlaybackAfterWindowDeminiaturize() {
        isWindowMinimized = false
        updateMediaPlaybackSuspension()
    }

    private func updateMediaPlaybackSuspension() {
        let shouldSuspend = isWindowMinimized
            || !isRedditPageActive
            || isPaywallPresented
            || isAwaitingReturnFromSubscriptionManagement
        guard let webView = container?.webView else { return }

        if shouldSuspend, !isMediaPlaybackSuspended {
            isMediaPlaybackSuspended = true
            webView.setAllMediaPlaybackSuspended(true, completionHandler: nil)
        } else if !shouldSuspend, isMediaPlaybackSuspended {
            isMediaPlaybackSuspended = false
            webView.setAllMediaPlaybackSuspended(false, completionHandler: nil)
        }
    }
}