using DealerSelection.Common.Configuration;
using Newtonsoft.Json;
using System.Net;
using System.Security.Cryptography;
using System.Text;

namespace DealerSelection.Common.Logging;

public static class AzureLogHelper
{
    private static string aZureWorkspaceId = ConfigurationHelper.GetSetting<string>("aZureWorkspaceId", true);
    private static string aZureSharedKey = ConfigurationHelper.GetSetting<string>("aZureSharedKey", true);
    private static string aZureLogType = ConfigurationHelper.GetSetting<string>("aZureLogType", true);
    private static string aZureApiVersion = ConfigurationHelper.GetSetting<string>("aZureApiVersion", true);

    public static void LogMessage(string message)
    {
        try
        {
            string azureLog = GetAzureLogFormatLog(message);
            string requestUriString = $"https://{aZureWorkspaceId}.ods.opinsights.azure.com/api/logs?api-version={aZureApiVersion}";
            DateTime dateTime = DateTime.UtcNow;
            string dateString = dateTime.ToString("r");
            string signature = GetSignature("POST", azureLog.Length, "application/json", dateString, "/api/logs");
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUriString);
            request.ContentType = "application/json";
            request.Method = "POST";
            request.Headers["Log-Type"] = aZureLogType;
            request.Headers["x-ms-date"] = dateString;
            request.Headers["Authorization"] = signature;
            byte[] content = Encoding.UTF8.GetBytes(azureLog);
            using (Stream requestStreamAsync = request.GetRequestStream())
            {
                requestStreamAsync.Write(content, 0, content.Length);
            }
            using (HttpWebResponse responseAsync = (HttpWebResponse)request.GetResponse())
            {
                if (responseAsync.StatusCode != HttpStatusCode.OK && responseAsync.StatusCode != HttpStatusCode.Accepted)
                {
                    Stream responseStream = responseAsync.GetResponseStream();
                    if (responseStream != null)
                    {
                        using (StreamReader streamReader = new StreamReader(responseStream))
                        {
                           // throw new Exception(streamReader.ReadToEnd());
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
           // throw new UnexpectedDataException($" Bajaj Booking LogMessage: ", ex);
        }
    }

    private static string GetAzureLogFormatLog(string inputMessage)
    {
        string message = string.Empty;
        if (!string.IsNullOrWhiteSpace(inputMessage))
        {
            message = JsonConvert.SerializeObject(
            new
            {
                id = Guid.NewGuid().ToString(),
                datetime = DateTime.Now,
                message = inputMessage
            }).ToString();
        }
        return message;
    }

    private static string GetSignature(string method, int contentLength, string contentType, string date, string resource)
    {
        string message = $"{method}\n{contentLength}\n{contentType}\nx-ms-date:{date}\n{resource}";
        byte[] bytes = Encoding.UTF8.GetBytes(message);
        using (HMACSHA256 encryptor = new HMACSHA256(Convert.FromBase64String(aZureSharedKey)))
        {
            return $"SharedKey {aZureWorkspaceId}:{Convert.ToBase64String(encryptor.ComputeHash(bytes))}";
        }
    }
}