using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using Firebase.Database.Offline;
using Newtonsoft.Json;

namespace Firebase.Database {
    public class FirebaseOptions {
        public FirebaseOptions() {
            OfflineDatabaseFactory = (t, s) => new Dictionary<string, OfflineEntry>();
            SubscriptionStreamReaderFactory = s => new StreamReader(s);
            JsonSerializerSettings = new JsonSerializerSettings();
            SyncPeriod = TimeSpan.FromSeconds(10);
        }

        /// <summary>
        ///     Gets or sets the factory for Firebase offline database. Default is in-memory dictionary.
        /// </summary>
        public Func<Type, string, IDictionary<string, OfflineEntry>> OfflineDatabaseFactory { get; set; }

        /// <summary>
        ///     Gets or sets the method for retrieving auth tokens. Default is null.
        /// </summary>
        public Func<Task<string>> AuthTokenAsyncFactory { get; set; }

        /// <summary>
        ///     Gets or sets the factory for <see cref="TextReader" /> used for reading online streams. Default is
        ///     <see cref="StreamReader" />.
        /// </summary>
        public Func<Stream, TextReader> SubscriptionStreamReaderFactory { get; set; }

        /// <summary>
        ///     Gets or sets the json serializer settings.
        /// </summary>
        public JsonSerializerSettings JsonSerializerSettings { get; set; }

        /// <summary>
        ///     Gets or sets the time between synchronization attempts for pulling and pushing offline entities. Default is 10
        ///     seconds.
        /// </summary>
        public TimeSpan SyncPeriod { get; set; }

        /// <summary>
        ///     Specify if token returned by factory will be used as "auth" url parameter or "access_token".
        /// </summary>
        public bool AsAccessToken { get; set; }
    }
}