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

import Foundation
import CryptoKit

public struct PushSubscription {
    let accountID: String
    let endpoint: URL
    public let secretKey: P256.KeyAgreement.PrivateKey
    public let authSecret: Data
    public var alerts: Alerts
    public var policy: Policy
    
    var defaultsDict: [String: Any] {
        [
            "accountID": accountID,
            "endpoint": endpoint.absoluteString,
            "secretKey": secretKey.rawRepresentation,
            "authSecret": authSecret,
            "alerts": alerts.rawValue,
            "policy": policy.rawValue
        ]
    }
    
    init?(defaultsDict: [String: Any]) {
        guard let accountID = defaultsDict["accountID"] as? String,
              let endpoint = (defaultsDict["endpoint"] as? String).flatMap(URL.init(string:)),
              let secretKey = (defaultsDict["secretKey"] as? Data).flatMap({ try? P256.KeyAgreement.PrivateKey(rawRepresentation: $0) }),
              let authSecret = defaultsDict["authSecret"] as? Data,
              let alerts = defaultsDict["alerts"] as? Int,
              let policy = (defaultsDict["policy"] as? String).flatMap(Policy.init(rawValue:)) else {
            return nil
        }
        self.accountID = accountID
        self.endpoint = endpoint
        self.secretKey = secretKey
        self.authSecret = authSecret
        self.alerts = Alerts(rawValue: alerts)
        self.policy = policy
    }
    
    init(accountID: String, endpoint: URL, secretKey: P256.KeyAgreement.PrivateKey, authSecret: Data, alerts: Alerts, policy: Policy) {
        self.accountID = accountID
        self.endpoint = endpoint
        self.secretKey = secretKey
        self.authSecret = authSecret
        self.alerts = alerts
        self.policy = policy
    }

    public enum Policy: String {
        case all, followed, followers
    }
    
    public struct Alerts: OptionSet {
        public static let mention = Alerts(rawValue: 1 << 0)
        public static let status = Alerts(rawValue: 1 << 1)
        public static let reblog = Alerts(rawValue: 1 << 2)
        public static let follow = Alerts(rawValue: 1 << 3)
        public static let followRequest = Alerts(rawValue: 1 << 4)
        public static let favorite = Alerts(rawValue: 1 << 5)
        public static let poll = Alerts(rawValue: 1 << 6)
        public static let update = Alerts(rawValue: 1 << 7)

        public let rawValue: Int
        
        public init(rawValue: Int) {
            self.rawValue = rawValue
        }
    }
}