//
//  PushManager.swift
//  PushNotifications
//
//  Created by Shadowfacts on 4/7/24.
//

import Foundation
import OSLog
import Pachyderm
import UserAccounts

public struct PushManager {
    @MainActor
    public static let shared = createPushManager()
    
    public static let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "PushManager")
    
    @MainActor
    public static var captureError: ((any Error) -> Void)?

    private init() {}
    
    @MainActor
    private static func createPushManager() -> any _PushManager {
        guard let info = Bundle.main.object(forInfoDictionaryKey: "TuskerInfo") as? [String: Any],
              let scheme = info["PushProxyScheme"] as? String,
              let host = info["PushProxyHost"] as? String,
              !scheme.isEmpty,
              !host.isEmpty else {
            logger.debug("Missing proxy info, push disabled")
            return DisabledPushManager()
        }
        var endpoint = URLComponents()
        endpoint.scheme = scheme
        endpoint.host = host
        let url = endpoint.url!
        logger.debug("Push notifications enabled with proxy \(url.absoluteString, privacy: .public)")
        return PushManagerImpl(endpoint: url)
    }
}

@MainActor
public protocol _PushManager {
    var enabled: Bool { get }
    var proxyRegistration: PushProxyRegistration? { get }
    
    var subscriptions: [PushSubscription] { get }
    func createSubscription(account: UserAccountInfo) throws -> PushSubscription
    func removeSubscription(account: UserAccountInfo)
    func updateSubscription(account: UserAccountInfo, alerts: PushSubscription.Alerts, policy: PushSubscription.Policy)
    func pushSubscription(account: UserAccountInfo) -> PushSubscription?
    
    func register() async throws -> PushProxyRegistration
    func unregister() async throws
    func updateIfNecessary(updateSubscription: @escaping (PushSubscription) async -> Bool) async
    
    func didRegisterForRemoteNotifications(deviceToken: Data)
    func didFailToRegisterForRemoteNotifications(error: any Error)
}