using System;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using LCU.API.Collections.RepoApi.Exceptions;
using Newtonsoft.Json;
using Serilog;

namespace LCU.API.Collections.RepoApi.DataAccess
{
    public abstract class DaoClient
    {
        private readonly IHttpClientFactory _clientFactory;
        
        protected DaoClient(IHttpClientFactory clientFactory)
        {
            _clientFactory = clientFactory;
        }
        
        public async Task<T> RetrieveByIdentifierAsync<T>(string url, string identifier)
        {
            // Temporary log to illustrate this working completely
            Log.Information($"Retrieve Async called for {typeof(T).Name} with {url}");
            using (var client = _clientFactory.CreateClient())
            {
                var request = new HttpRequestMessage(HttpMethod.Get, url);
                var response = await client.SendAsync(request);

                if (response.IsSuccessStatusCode)
                {
                    try
                    {
                        var retrievedObject = JsonConvert.DeserializeObject<T>(
                            await response.Content.ReadAsStringAsync());

                        return retrievedObject;
                    }
                    catch (Exception ex)
                    {
                        Log.Error(ex,$"Error Deserializing {typeof(T).Name} for {identifier}");
                        throw new ServerErrorException();
                    }
                }
                
                if (response.StatusCode == HttpStatusCode.NotFound)
                {
                    return default(T);
                }

                Log.Error($"Retrieve {typeof(T).Name} Bad Status Code {response.StatusCode}, for { url}");
                throw new MissingRequirementException(typeof(T).Name, $"Failed to retrieve {typeof(T).Name} for {identifier}");
            }
        }
        
        public async Task<T> RetrieveAllAsync<T>(string url)
        {
            // Temporary log
            Log.Information($"Retrieve All Async called for {typeof(T).Name} with {url}");
            using (var client = _clientFactory.CreateClient())
            {
                var request = new HttpRequestMessage(HttpMethod.Get, url);
                var response = await client.SendAsync(request);

                if (response.IsSuccessStatusCode)
                {
                    try
                    {
                        var retrievedObject = JsonConvert.DeserializeObject<T>(
                            await response.Content.ReadAsStringAsync());

                        return retrievedObject;
                    }
                    catch (Exception ex)
                    {
                        Log.Error(ex,$"Error Deserializing {typeof(T).Name} for {url}");
                        throw new ServerErrorException();
                    }
                }

                Log.Error($"Retrieve {typeof(T).Name} Bad Status Code {response.StatusCode}, for { url}");
                throw new MissingRequirementException(typeof(T).Name, $"Failed to retrieve {typeof(T).Name} for {url}");
            }
        }
    }
}