using System;
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Serilog;
namespace Landmark.OLA.Application.Services.Email
{
public class EmailTemplateService : IEmailTemplateService
{
private readonly string _embeddedLogoBase64;
public EmailTemplateService(IWebHostEnvironment webHostEnvironment)
{
_embeddedLogoBase64 = LoadEmbeddedLogo(webHostEnvironment);
}
private static string LoadEmbeddedLogo(IWebHostEnvironment webHostEnvironment)
{
if (webHostEnvironment == null)
{
return string.Empty;
}
try
{
var logoPath = Path.Combine(webHostEnvironment.ContentRootPath, "Files", "Logo.png");
if (!File.Exists(logoPath))
{
Log.Warning("Logo not found at {LogoPath}. Email will fall back to remote image.", logoPath);
return string.Empty;
}
var bytes = File.ReadAllBytes(logoPath);
return Convert.ToBase64String(bytes);
}
catch (Exception ex)
{
Log.Warning(ex, "Failed to embed logo from file.");
return string.Empty;
}
}
public string BuildBrandedBody(string contentHtml, string redBannerMessage = "")
{
var topLogoTag = $"![](\"data:image/png;base64,{_embeddedLogoBase64}\")
";
var bottomLogoTag = $"";
redBannerMessage ??= string.Empty;
var bannerHtml = string.IsNullOrWhiteSpace(redBannerMessage)
? string.Empty
:
"" +
"" +
redBannerMessage +
"
" +
"
";
var requestBody =
"" +
"" +
"" +
"" +
"|
" +
"" +
"| " +
topLogoTag +
" | " +
"
" +
"|
" +
"" +
"
" +
"" +
"" +
"" +
"| " +
bannerHtml +
contentHtml +
" | " +
"
" +
"|
" +
"" +
"
" +
"" +
"" +
"" +
"| | " +
"
" +
"" +
"| | " +
"" +
"" +
" " +
bottomLogoTag +
" " +
" | " +
"" +
" | " +
" | " +
"
" +
"" +
"| | " +
"
" +
"" +
"
" +
"" +
"";
return requestBody;
}
}
}