using GameData.Helper;
using GameData.Model;
using GameData.Repository;
using GameModel.Settings;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http.Headers;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace GameData
{
    public sealed class ApiClient : IDisposable
    {
        private class WrapperArray<T>
        {
            public T[] Data { get; set; }
        }

        private class WrapperSingle<T>
        {
            public T Data { get; set; }
        }

        private readonly HttpClient client;
        private readonly ILogger<ApiClient> _logger;
        private readonly AppSettings _appSettings;
        private readonly string Api;

        public ApiClient(AppSettings appSettings, ILogger<ApiClient> logger)
        {
            _logger = logger;
            _appSettings = appSettings;

            client = new HttpClient
            {
                Timeout = TimeSpan.FromMinutes(1)
            };

            client.DefaultRequestHeaders
                    .Accept
                    .Add(new MediaTypeWithQualityHeaderValue("application/json"));

            client.DefaultRequestHeaders
                    .Authorization = new AuthenticationHeaderValue("Bearer", _appSettings.ApiToken);

            //client.DefaultRequestHeaders.Add("Api-AppInfo", "KrahApp;" + Assembly.GetExecutingAssembly().GetName().Version.ToString());

            Api = _appSettings.ApiBaseUrl;
            if (!Api.EndsWith("/"))
            {
                Api += "/";
            }
        }

        public void Dispose()
        {
            client.Dispose();
        }

        public string UrlEncode(string s)
        {
            return HttpUtility.UrlEncode(s);
        }

        private string GetFullUrl(string url)
        {
            if (url[0].Equals('/'))
            {
                url = url.Remove(0, 1);
            }

            url = Api + url;
            return url;
        }

        private HttpRequestMessage GetHttpRequestMessage(HttpMethod method, string serviceUrl, object payload = null)
        {
            StringContent content = null;
            if (payload != null)
            {
                var payloadString = LowercaseJsonSerializer.SerializeObject(payload);
                content = new StringContent(payloadString, Encoding.UTF8, "application/json");
            }

            var url = serviceUrl;
            if (!serviceUrl.StartsWith("http", StringComparison.InvariantCultureIgnoreCase))
            {
                url = GetFullUrl(serviceUrl);
            }

            var res = new HttpRequestMessage
            {
                Content = content,
                Method = method,
                RequestUri = new Uri(url),
            };
            //res.Headers.Add("Authorization: Bearer", _apiKey);
            return res;
        }

        public async Task<bool> DownloadFile(string serviceUrl, string targetFile)
        {
            var res = false;
            try
            {
                var request = GetHttpRequestMessage(HttpMethod.Get, serviceUrl);
                request.Headers.Add("Accept", "application/json");
                request.Headers.Add("Accept", "application/octet-stream");
                request.Headers.Add("Accept", "file/download");

                var response = await client.SendAsync(request);

                if (response.IsSuccessStatusCode)
                {
                    using (var responseStream = await response.Content.ReadAsStreamAsync())
                    {
                        using (var fileStream = new FileStream(targetFile, FileMode.Create, FileAccess.Write, FileShare.None, 4096, true))
                        {
                            await responseStream.CopyToAsync(fileStream);
                            res = true;
                        }
                    }
                }
                else
                {
                    var errorResult = await response.Content.ReadAsStringAsync();
                    _logger.LogError("error downloading from service '{service}' with code '{statuscode}' - Result: '{result}', TargetFile: '{payload}'", serviceUrl, response.StatusCode, errorResult, targetFile);
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "error at DownloadFile");
            }

            return res;
        }

        /// <summary>
        /// Create an item 
        /// https://docs.directus.io/reference/items.html#create-an-item
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="payload"></param>
        /// <param name="serviceUrl"></param>
        /// <param name="suppressExceptions"></param>
        /// <returns></returns>
        public async Task<T> Post<T>(object payload, string serviceUrl, bool suppressExceptions = false)
        {
            T res = default;

            try
            {
                var response = await client.SendAsync(GetHttpRequestMessage(HttpMethod.Post, serviceUrl, payload));

                if (response.IsSuccessStatusCode)
                {
                    using (var responseStream = response.Content.ReadAsStream())
                    {
                        using (var streamReader = new StreamReader(responseStream))
                        {
                            using (var jsonTextReader = new JsonTextReader(streamReader))
                            {
                                var serializer = new JsonSerializer();
                                var wrapper = serializer.Deserialize<WrapperSingle<T>>(jsonTextReader);
                                res = wrapper.Data;
                            }
                        }
                    }
                }
                else
                {
                    var errorResult = await response.Content.ReadAsStringAsync();
                    _logger.LogError("error posting to service '{service}' with code '{statuscode}' - Result: '{result}', Payload: '{payload}'", serviceUrl, response.StatusCode, errorResult, JsonConvert.SerializeObject(payload));
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "error at post");
                if (!suppressExceptions)
                {
                    throw ex;
                }
            }

            return res;
        }

        public async Task Delete(object payload, string serviceUrl, bool suppressExceptions = true)
        {
            try
            {
                var response = await client.SendAsync(GetHttpRequestMessage(HttpMethod.Delete, serviceUrl, payload));

                if (response.IsSuccessStatusCode)
                {
                    //using (var responseStream = await response.Content.ReadAsStreamAsync())
                    //{
                    //    using (var streamReader = new StreamReader(responseStream))
                    //    {
                    //        using (var jsonTextReader = new JsonTextReader(streamReader))
                    //        {
                    //            var serializer = new JsonSerializer();
                    //            res = serializer.Deserialize<T>(jsonTextReader);
                    //        }
                    //    }
                    //}
                }
                else
                {
                    var errorResult = await response.Content.ReadAsStringAsync();
                    _logger.LogError("error deleting to service '{service}' with code '{statuscode}' - Result: '{result}', Payload: '{payload}'", serviceUrl, response.StatusCode, errorResult, JsonConvert.SerializeObject(payload));
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "error at Delete");
                if (!suppressExceptions)
                {
                    throw ex;
                }
            }

            //return res;
        }

        public async Task<T[]> Get<T>(string serviceUrl, bool suppressExceptions = false)
        {
            WrapperArray<T> res = default;

            try
            {
                _logger.LogDebug($"calling service url {serviceUrl}");
                var response = await client.SendAsync(GetHttpRequestMessage(HttpMethod.Get, serviceUrl));

                if (response.IsSuccessStatusCode)
                {
                    using (var responseStream = response.Content.ReadAsStream())
                    {
                        using (var streamReader = new StreamReader(responseStream))
                        {
                            string content;
                            if (typeof(T).Equals(typeof(string)))
                            {
                                content = streamReader.ReadToEnd();
                                res = (WrapperArray<T>)Convert.ChangeType(content, typeof(T));
                            }
                            else
                            {
                                using (var jsonTextReader = new JsonTextReader(streamReader))
                                {
                                    var serializer = new JsonSerializer();
                                    res = serializer.Deserialize<WrapperArray<T>>(jsonTextReader);
                                }
                            }
                        }
                    }
                }
                else
                {
                    var errorResult = await response.Content.ReadAsStringAsync();
                    _logger.LogError("error getting from service '{service}' with code '{statuscode}' - Result: '{result}'", serviceUrl, response.StatusCode, errorResult);
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "error at Get");
                if (!suppressExceptions)
                {
                    throw ex;
                }
            }

            return res.Data;
        }

        public async Task<T> GetSingle<T>(string serviceUrl, bool suppressExceptions = false) 
        {
            WrapperSingle<T> res = default;
            
            try
            {
                _logger.LogDebug($"calling service url {serviceUrl}");
                var response = await client.SendAsync(GetHttpRequestMessage(HttpMethod.Get, serviceUrl));

                if (response.IsSuccessStatusCode)
                {
                    using (var responseStream = response.Content.ReadAsStream())
                    {
                        using (var streamReader = new StreamReader(responseStream))
                        {
                            string content;
                            if (typeof(T).Equals(typeof(string)))
                            {
                                content = streamReader.ReadToEnd();
                                res = (WrapperSingle<T>)Convert.ChangeType(content, typeof(T));
                            }
                            else
                            {
                                using (var jsonTextReader = new JsonTextReader(streamReader))
                                {
                                    var serializer = new JsonSerializer();
                                    res = serializer.Deserialize<WrapperSingle<T>>(jsonTextReader);
                                }
                            }
                        }
                    }
                }
                else
                {
                    var errorResult = await response.Content.ReadAsStringAsync();
                    _logger.LogError("error getting from service '{service}' with code '{statuscode}' - Result: '{result}'", serviceUrl, response.StatusCode, errorResult);
                    return await Task.FromResult<T>(default(T));
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "error at Get");
                if (!suppressExceptions)
                {
                    throw ex;
                }
            }

            return res.Data;
        }

        internal async Task Put<T>(object payload, string serviceUrl, bool suppressExceptions = false)
        {
            T res = default;

            try
            {
                var response = await client.SendAsync(GetHttpRequestMessage(HttpMethod.Post, serviceUrl, payload));

                if (response.IsSuccessStatusCode)
                {
                    using (var responseStream = response.Content.ReadAsStream())
                    {
                        using (var streamReader = new StreamReader(responseStream))
                        {
                            using (var jsonTextReader = new JsonTextReader(streamReader))
                            {
                                var serializer = new JsonSerializer();
                                var wrapper = serializer.Deserialize<WrapperSingle<T>>(jsonTextReader);
                                res = wrapper.Data;
                            }
                        }
                    }
                }
                else
                {
                    var errorResult = await response.Content.ReadAsStringAsync();
                    _logger.LogError("error posting to service '{service}' with code '{statuscode}' - Result: '{result}', Payload: '{payload}'", serviceUrl, response.StatusCode, errorResult, JsonConvert.SerializeObject(payload));
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "error at post");
                if (!suppressExceptions)
                {
                    throw ex;
                }


            }
        }
    }
}