using System;
using System.Collections.Specialized;
using System.Text;
using System.Web;
using Kreta.Web.Logging.Logger;

namespace Kreta.User.WebApi.RequestResponseLogger
{
    class AuthenticateRequestBodyRenderer : LoggingFieldRenderer
    {
        const string SecretLogValue = "***";

        const string Password = nameof(Password);

        const string UserName = nameof(UserName);

        public override void Render(string fieldName, LoggingFieldRendererContext context)
        {
            var contentBodyString = context.GetFieldValue(fieldName) as string;

            if (!string.IsNullOrWhiteSpace(contentBodyString))
            {
                try
                {
                    string userName = null;

                    NameValueCollection contentBodyElements = HttpUtility.ParseQueryString(contentBodyString);

                    foreach (string key in contentBodyElements.AllKeys)
                    {
                        if (string.Equals(key, Password, StringComparison.InvariantCultureIgnoreCase))
                        {
                            contentBodyElements[key] = SecretLogValue;
                        }

                        if (string.Equals(key, UserName, StringComparison.InvariantCultureIgnoreCase))
                        {
                            userName = contentBodyElements[key];
                        }
                    }

                    if (!string.IsNullOrWhiteSpace(userName))
                    {
                        var requestUserIdentifier = new StringBuilder(userName.ToUpper());

                        var requestUri = context.GetFieldValue(RequestResponseLoggingFields.Request.Uri) as string;

                        if (!string.IsNullOrWhiteSpace(requestUri))
                        {
                            requestUserIdentifier.Append('/');

                            try
                            {
                                var uri = new Uri(requestUri);
                                requestUserIdentifier.Append(uri.Authority.Split('.')[0]);
                            }
                            catch (Exception ex)
                            {
                                requestUserIdentifier.Append($"[{ex.Message}]");
                            }
                        }

                        context.SetFieldValue(RequestResponseLoggingFields.Request.User, requestUserIdentifier.ToString());
                    }

                    context.SetFieldValue(fieldName, contentBodyElements.ToString());

                }
                catch (Exception ex)
                {
                    context.SetFieldValue(fieldName, ex.ToString());
                }
            }
        }
    }
}