using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Wabbajack.Common;
using Wabbajack.Common.Exceptions;
using Wabbajack.Common.Serialization.Json;
using Wabbajack.Lib.Downloaders;

namespace Wabbajack.Lib
{
    [JsonName("ModUpgradeRequest")]
    public class ModUpgradeRequest
    {
        public Archive OldArchive { get; set; }
        public Archive NewArchive { get; set; }

        public ModUpgradeRequest(Archive oldArchive, Archive newArchive)
        {
            OldArchive = oldArchive;
            NewArchive = newArchive;
        }

        public bool IsValid
        {
            get
            {
                if (OldArchive.Hash == NewArchive.Hash && OldArchive.State.PrimaryKeyString == NewArchive.State.PrimaryKeyString) return false;
                if (OldArchive.State.GetType() != NewArchive.State.GetType())
                    return false;
                if (OldArchive.State is IUpgradingState u)
                {
                    return u.ValidateUpgrade(NewArchive.State);
                }

                return false;
            }
        }
    }
    
    public class ClientAPI
    {
        public static Common.Http.Client GetClient()
        {
            var client = new Common.Http.Client();
            if (Utils.HaveEncryptedJson(Consts.MetricsKeyHeader)) 
                client.Headers.Add((Consts.MetricsKeyHeader, Utils.FromEncryptedJson<string>(Consts.MetricsKeyHeader)));
            return client;
        }

        

        public static async Task<Uri> GetModUpgrade(Archive oldArchive, Archive newArchive, TimeSpan? maxWait = null, TimeSpan? waitBetweenTries = null)
        {
            maxWait ??= TimeSpan.FromMinutes(10);
            waitBetweenTries ??= TimeSpan.FromSeconds(15);
            
            var request = new ModUpgradeRequest( oldArchive, newArchive);
            var start = DateTime.UtcNow;
            
            RETRY:
            
            var response = await GetClient()
                .PostAsync($"{Consts.WabbajackBuildServerUri}mod_upgrade", new StringContent(request.ToJson(), Encoding.UTF8, "application/json"));

            if (response.IsSuccessStatusCode)
            {
                switch (response.StatusCode)
                {
                    case HttpStatusCode.OK:
                        return new Uri(await response.Content.ReadAsStringAsync());
                    case HttpStatusCode.Accepted:
                        Utils.Log($"Waiting for patch processing on the server for {oldArchive.Name}, sleeping for another 15 seconds");
                        await Task.Delay(TimeSpan.FromSeconds(15));
                        response.Dispose();
                        if (DateTime.UtcNow - start > maxWait)
                            throw new HttpException(response);
                        goto RETRY;
                }
            }
            var ex = new HttpException(response);
            response.Dispose();
            throw ex;
        }

        /// <summary>
        /// Given an archive hash, search the Wabbajack server for a matching .ini file
        /// </summary>
        /// <param name="hash"></param>
        /// <returns></returns>
        public static async Task<string?> GetModIni(Hash hash)
        {
            var client = new Common.Http.Client();
            try
            {
                return await client.GetStringAsync(
                        $"{Consts.WabbajackBuildServerUri}indexed_files/{hash.ToHex()}/meta.ini");
            }
            catch (HttpException)
            {
                return null;
            }
        }

        public class NexusCacheStats
        {
            public long CachedCount { get; set; }
            public long ForwardCount { get; set; }
            public double CacheRatio { get; set; }
        }

        public static async Task<NexusCacheStats> GetNexusCacheStats()
        {
            return await GetClient()
                .GetJsonAsync<NexusCacheStats>($"{Consts.WabbajackBuildServerUri}nexus_cache/stats");
        }

        public static async Task<Dictionary<RelativePath, Hash>> GetGameFiles(Game game, Version version)
        {
            // TODO: Disabled for now
            return new Dictionary<RelativePath, Hash>();
            /*
            return await GetClient()
                .GetJsonAsync<Dictionary<RelativePath, Hash>>($"{Consts.WabbajackBuildServerUri}game_files/{game}/{version}");
                */
        }
    }
}