using MatrixRoomUtils.Core.Extensions;
using MatrixRoomUtils.Core.Responses;

namespace MatrixRoomUtils.Core;

public class RuntimeCache
{
    public static bool WasLoaded = false;
    public static string? LastUsedToken { get; set; }
    public static AuthenticatedHomeServer CurrentHomeServer { get; set; }
    public static Dictionary<string, UserInfo> LoginSessions { get; set; } = new();

    public static Dictionary<string, HomeServerResolutionResult> HomeserverResolutionCache { get; set; } = new();
    // public static Dictionary<string, (DateTime cachedAt, ProfileResponse response)> ProfileCache { get; set; } = new();

    public static Dictionary<string, ObjectCache<object>> GenericResponseCache { get; set; } = new();

    public static Action Save { get; set; } = () => { Console.WriteLine("RuntimeCache.Save() was called, but no callback was set!"); };
    public static Action<string, object> SaveObject { get; set; } = (key, value) => { Console.WriteLine($"RuntimeCache.SaveObject({key}, {value}) was called, but no callback was set!"); };
    public static Action<string> RemoveObject { get; set; } = key => { Console.WriteLine($"RuntimeCache.RemoveObject({key}) was called, but no callback was set!"); };

    static RuntimeCache()
    {
        Task.Run(async () =>
        {
            while(true)
            {
                await Task.Delay(1000);
                foreach (var (key, value) in GenericResponseCache)
                {
                    if (value.Cache.Any())
                        SaveObject("rory.matrixroomutils.generic_cache:" + key, value);
                    else
                    {
                        RemoveObject("rory.matrixroomutils.generic_cache:" + key);
                    }
                }
            }
        });
    }
}

public class UserInfo
{
    public ProfileResponse Profile { get; set; } = new();
    public LoginResponse LoginResponse { get; set; }

    public string AccessToken
    {
        get => LoginResponse.AccessToken;
    }
}

public class HomeServerResolutionResult
{
    public string Result { get; set; }
    public DateTime ResolutionTime { get; set; }
}

public class ObjectCache<T> where T : class
{
    public Dictionary<string, GenericResult<T>> Cache { get; set; } = new();
    public string Name { get; set; } = null!;

    public GenericResult<T> this[string key]
    {
        get
        {
            if (Cache.ContainsKey(key))
            {
                // Console.WriteLine($"cache.get({key}): hit");
                // Console.WriteLine($"Found item in cache: {key} - {Cache[key].Result.ToJson(indent: false)}");
                if (Cache[key].ExpiryTime < DateTime.Now)
                    Console.WriteLine($"WARNING: item {key} in cache {Name} expired at {Cache[key].ExpiryTime}:\n{Cache[key].Result.ToJson(indent: false)}");
                return Cache[key];
            }

            Console.WriteLine($"cache.get({key}): miss");
            return null;
        }
        set
        {
            Cache[key] = value;
            // Console.WriteLine($"set({key}) = {Cache[key].Result.ToJson(indent:false)}");
            // Console.WriteLine($"new_state: {this.ToJson(indent:false)}");
            // Console.WriteLine($"New item in cache: {key} - {Cache[key].Result.ToJson(indent: false)}");
            // Console.Error.WriteLine("Full cache: " + Cache.ToJson());
        }
    }

    public ObjectCache()
    {
        //expiry timer
        Task.Run(async () =>
        {
            while (Cache.Any())
            {
                await Task.Delay(1000);
                foreach (var x in Cache.Where(x => x.Value.ExpiryTime < DateTime.Now).OrderBy(x => x.Value.ExpiryTime).Take(15).ToList())
                {
                    // Console.WriteLine($"Removing {x.Key} from cache");
                    Cache.Remove(x.Key);
                }
                //RuntimeCache.SaveObject("rory.matrixroomutils.generic_cache:" + Name, this);
            }
        });
    }

    public bool ContainsKey(string key) => Cache.ContainsKey(key);
}

public class GenericResult<T>
{
    public T? Result { get; set; }
    public DateTime? ExpiryTime { get; set; } = DateTime.Now;

    public GenericResult()
    {
        //expiry timer
    }

    public GenericResult(T? result, DateTime? expiryTime = null) : this()
    {
        Result = result;
        ExpiryTime = expiryTime;
    }
}