using System;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;


using Amazon.S3.Model;


namespace ServerCore;


// HANDOVER: HttpClient SDK Wrapper 클래스 이다.

public sealed class SharedHttpClient : Singleton<SharedHttpClient>
{
    private readonly HttpClient m_http_client = new();

    public SharedHttpClient()
    {
    }

    //=============================================================================================
    // 일반적인 HTTP 요청 처리 (GET, POST, PUT, DELETE 등 모든 메서드 지원)
    //=============================================================================================
    public async Task<HttpResponseMessage?> sendAsync(HttpRequestMessage requestMessage, CancellationToken cancellationToken = default)
    {
        var err_msg = string.Empty;

        try
        {
            return await m_http_client.SendAsync(requestMessage, cancellationToken);
        }
        catch (HttpRequestException e)
        {
            err_msg = $"HttpRequestException !!!, Network error or invalid response, Failed to perform in sendAsync() : exception:{e} - {requestMessage.RequestUri}";
            Log.getLogger().error(err_msg);
        }
        catch (TaskCanceledException e)
        {
            if (cancellationToken.IsCancellationRequested)
            {
                err_msg = $"TaskCanceledException !!!, Request was canceled by caller, Failed to perform in sendAsync() : exception:{e} - {requestMessage.RequestUri}";
                Log.getLogger().error(err_msg);
            }
            else
            {
                err_msg = $"TaskCanceledException !!!, Request timed out, Failed to perform in sendAsync() : exception:{e} - {requestMessage.RequestUri}";
                Log.getLogger().error(err_msg);
            }
        }
        catch (TimeoutException e)
        {
            err_msg = $"TimeoutException !!!, The request exceeded the timeout limit, Failed to perform in sendAsync() : exception:{e} - {requestMessage.RequestUri}";
            Log.getLogger().error(err_msg);
        }
        catch (Exception e)
        {
            err_msg = $"Exception !!!, Unhandled exception during HTTP request, Failed to perform in sendAsync() : exception:{e} - {requestMessage.RequestUri}";
            Log.getLogger().error(err_msg);
        }

        return null;
    }

    public async Task<HttpResponseMessage?> getAsync(string url, CancellationToken cancellationToken = default)
    {
        var err_msg = string.Empty;

        try
        {
            // GET Http Method
            return await m_http_client.GetAsync(url, cancellationToken);
        }
        catch (HttpRequestException e)
        {
            err_msg = $"HttpRequestException !!!, Network error or invalid response, Failed to perfom in getAsync() : exception:{e} - {url}";
            Log.getLogger().error(err_msg);
        }
        catch (TaskCanceledException e)
        {
            if (cancellationToken.IsCancellationRequested)
            {
                err_msg = $"TaskCanceledException !!!, Request was canceled by caller, Failed to perfom in getAsync() : exception:{e} - {url}";
                Log.getLogger().error(err_msg);
            }
            else
            {
                err_msg = $"TaskCanceledException !!!, Request timed out, Failed to perfom in getAsync() : exception:{e} - {url}";
                Log.getLogger().error(err_msg);
            }
        }
        catch (TimeoutException e)
        {
            err_msg = $"TimeoutException !!!, The request exceeded the timeout limit, Failed to perfom in getAsync() : exception:{e} - {url}";
            Log.getLogger().error(err_msg);
        }
        catch (Exception e)
        {
            err_msg = $"Exception !!!, Unhandled exception during HTTP GET request, Failed to perfom in getAsync() : exception:{e} - {url}";
            Log.getLogger().error(err_msg);
        }

        return null;
    }

    public async Task<HttpResponseMessage?> postAsync(string url, HttpContent content, CancellationToken cancellationToken = default)
    {
        var err_msg = string.Empty;

        try
        {
            // POST Http Method
            return await m_http_client.PostAsync(url, content, cancellationToken);
        }
        catch (HttpRequestException e)
        {
            err_msg = $"HttpRequestException !!!, Network error or invalid response, Failed to perfom in getAsync() : exception:{e} - {url}";
            Log.getLogger().error(err_msg);
        }
        catch (TaskCanceledException e)
        {
            if (cancellationToken.IsCancellationRequested)
            {
                err_msg = $"TaskCanceledException !!!, Request was canceled by caller, Failed to perfom in getAsync() : exception:{e} - {url}";
                Log.getLogger().error(err_msg);
            }
            else
            {
                err_msg = $"TaskCanceledException !!!, Request timed out, Failed to perfom in getAsync() : exception:{e} - {url}";
                Log.getLogger().error(err_msg);
            }
        }
        catch (TimeoutException e)
        {
            err_msg = $"TimeoutException !!!, The request exceeded the timeout limit, Failed to perfom in getAsync() : exception:{e} - {url}";
            Log.getLogger().error(err_msg);
        }
        catch (Exception e)
        {
            err_msg = $"Exception !!!, Unhandled exception during HTTP GET request, Failed to perfom in getAsync() : exception:{e} - {url}";
            Log.getLogger().error(err_msg);
        }

        return null;
    }
}