server/src/Core/Services/Implementations/HandlebarsMailService.cs

using System.Net;
using System.Reflection;
using Bit.Core.Entities;
using Bit.Core.Entities.Provider;
using Bit.Core.Models.Business;
using Bit.Core.Models.Mail;
using Bit.Core.Models.Mail.FamiliesForEnterprise;
using Bit.Core.Models.Mail.Provider;
using Bit.Core.Settings;
using Bit.Core.Utilities;
using HandlebarsDotNet;

namespace Bit.Core.Services;

public class HandlebarsMailService : IMailService
{
    private const string Namespace = "Bit.Core.MailTemplates.Handlebars";

    private readonly GlobalSettings _globalSettings;
    private readonly IMailDeliveryService _mailDeliveryService;
    private readonly IMailEnqueuingService _mailEnqueuingService;
    private readonly Dictionary<string, HandlebarsTemplate<object, object>> _templateCache =
        new Dictionary<string, HandlebarsTemplate<object, object>>();

    private bool _registeredHelpersAndPartials = false;

    public HandlebarsMailService(
        GlobalSettings globalSettings,
        IMailDeliveryService mailDeliveryService,
        IMailEnqueuingService mailEnqueuingService)
    {
        _globalSettings = globalSettings;
        _mailDeliveryService = mailDeliveryService;
        _mailEnqueuingService = mailEnqueuingService;
    }

    public async Task SendVerifyEmailEmailAsync(string email, Guid userId, string token)
    {
        var message = CreateDefaultMessage("Verify Your Email", email);
        var model = new VerifyEmailModel
        {
            Token = WebUtility.UrlEncode(token),
            UserId = userId,
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "VerifyEmail", model);
        message.MetaData.Add("SendGridBypassListManagement", true);
        message.Category = "VerifyEmail";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendVerifyDeleteEmailAsync(string email, Guid userId, string token)
    {
        var message = CreateDefaultMessage("Delete Your Account", email);
        var model = new VerifyDeleteModel
        {
            Token = WebUtility.UrlEncode(token),
            UserId = userId,
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
            Email = email,
            EmailEncoded = WebUtility.UrlEncode(email)
        };
        await AddMessageContentAsync(message, "VerifyDelete", model);
        message.MetaData.Add("SendGridBypassListManagement", true);
        message.Category = "VerifyDelete";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendChangeEmailAlreadyExistsEmailAsync(string fromEmail, string toEmail)
    {
        var message = CreateDefaultMessage("Your Email Change", toEmail);
        var model = new ChangeEmailExistsViewModel
        {
            FromEmail = fromEmail,
            ToEmail = toEmail,
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "ChangeEmailAlreadyExists", model);
        message.Category = "ChangeEmailAlreadyExists";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendChangeEmailEmailAsync(string newEmailAddress, string token)
    {
        var message = CreateDefaultMessage("Your Email Change", newEmailAddress);
        var model = new EmailTokenViewModel
        {
            Token = token,
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "ChangeEmail", model);
        message.MetaData.Add("SendGridBypassListManagement", true);
        message.Category = "ChangeEmail";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendTwoFactorEmailAsync(string email, string token)
    {
        var message = CreateDefaultMessage("Your Two-step Login Verification Code", email);
        var model = new EmailTokenViewModel
        {
            Token = token,
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "TwoFactorEmail", model);
        message.MetaData.Add("SendGridBypassListManagement", true);
        message.Category = "TwoFactorEmail";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendMasterPasswordHintEmailAsync(string email, string hint)
    {
        var message = CreateDefaultMessage("Your Master Password Hint", email);
        var model = new MasterPasswordHintViewModel
        {
            Hint = CoreHelpers.SanitizeForEmail(hint, false),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "MasterPasswordHint", model);
        message.Category = "MasterPasswordHint";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendNoMasterPasswordHintEmailAsync(string email)
    {
        var message = CreateDefaultMessage("Your Master Password Hint", email);
        var model = new BaseMailModel
        {
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "NoMasterPasswordHint", model);
        message.Category = "NoMasterPasswordHint";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendOrganizationAutoscaledEmailAsync(Organization organization, int initialSeatCount, IEnumerable<string> ownerEmails)
    {
        var message = CreateDefaultMessage($"{organization.Name} Seat Count Has Increased", ownerEmails);
        var model = new OrganizationSeatsAutoscaledViewModel
        {
            OrganizationId = organization.Id,
            InitialSeatCount = initialSeatCount,
            CurrentSeatCount = organization.Seats.Value,
        };

        await AddMessageContentAsync(message, "OrganizationSeatsAutoscaled", model);
        message.Category = "OrganizationSeatsAutoscaled";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendOrganizationMaxSeatLimitReachedEmailAsync(Organization organization, int maxSeatCount, IEnumerable<string> ownerEmails)
    {
        var message = CreateDefaultMessage($"{organization.Name} Seat Limit Reached", ownerEmails);
        var model = new OrganizationSeatsMaxReachedViewModel
        {
            OrganizationId = organization.Id,
            MaxSeatCount = maxSeatCount,
        };

        await AddMessageContentAsync(message, "OrganizationSeatsMaxReached", model);
        message.Category = "OrganizationSeatsMaxReached";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendOrganizationAcceptedEmailAsync(Organization organization, string userIdentifier,
        IEnumerable<string> adminEmails)
    {
        var message = CreateDefaultMessage($"Action Required: {userIdentifier} Needs to Be Confirmed", adminEmails);
        var model = new OrganizationUserAcceptedViewModel
        {
            OrganizationId = organization.Id,
            OrganizationName = CoreHelpers.SanitizeForEmail(organization.Name, false),
            UserIdentifier = userIdentifier,
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "OrganizationUserAccepted", model);
        message.Category = "OrganizationUserAccepted";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendOrganizationConfirmedEmailAsync(string organizationName, string email)
    {
        var message = CreateDefaultMessage($"You Have Been Confirmed To {organizationName}", email);
        var model = new OrganizationUserConfirmedViewModel
        {
            TitleFirst = "You're confirmed as a member of ",
            TitleSecondBold = CoreHelpers.SanitizeForEmail(organizationName, false),
            TitleThird = "!",
            OrganizationName = CoreHelpers.SanitizeForEmail(organizationName, false),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "OrganizationUserConfirmed", model);
        message.Category = "OrganizationUserConfirmed";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public Task SendOrganizationInviteEmailAsync(string organizationName, OrganizationUser orgUser, ExpiringToken token, bool isFreeOrg) =>
        BulkSendOrganizationInviteEmailAsync(organizationName, new[] { (orgUser, token) }, isFreeOrg);

    public async Task BulkSendOrganizationInviteEmailAsync(string organizationName, IEnumerable<(OrganizationUser orgUser, ExpiringToken token)> invites, bool isFreeOrg)
    {
        MailQueueMessage CreateMessage(string email, object model)
        {
            var message = CreateDefaultMessage($"Join {organizationName}", email);
            return new MailQueueMessage(message, "OrganizationUserInvited", model);
        }
        var freeOrgTitle = "A Bitwarden member invited you to an organization. Join now to start securing your passwords!";
        var messageModels = invites.Select(invite => CreateMessage(invite.orgUser.Email,
            new OrganizationUserInvitedViewModel
            {
                TitleFirst = isFreeOrg ? freeOrgTitle : "Join ",
                TitleSecondBold = isFreeOrg ? string.Empty : CoreHelpers.SanitizeForEmail(organizationName, false),
                TitleThird = isFreeOrg ? string.Empty : " on Bitwarden and start securing your passwords!",
                OrganizationName = CoreHelpers.SanitizeForEmail(organizationName, false) + invite.orgUser.Status,
                Email = WebUtility.UrlEncode(invite.orgUser.Email),
                OrganizationId = invite.orgUser.OrganizationId.ToString(),
                OrganizationUserId = invite.orgUser.Id.ToString(),
                Token = WebUtility.UrlEncode(invite.token.Token),
                ExpirationDate = $"{invite.token.ExpirationDate.ToLongDateString()} {invite.token.ExpirationDate.ToShortTimeString()} UTC",
                OrganizationNameUrlEncoded = WebUtility.UrlEncode(organizationName),
                WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
                SiteName = _globalSettings.SiteName,
            }
        ));

        await EnqueueMailAsync(messageModels);
    }

    public async Task SendOrganizationUserRemovedForPolicyTwoStepEmailAsync(string organizationName, string email)
    {
        var message = CreateDefaultMessage($"You have been removed from {organizationName}", email);
        var model = new OrganizationUserRemovedForPolicyTwoStepViewModel
        {
            OrganizationName = CoreHelpers.SanitizeForEmail(organizationName, false),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "OrganizationUserRemovedForPolicyTwoStep", model);
        message.Category = "OrganizationUserRemovedForPolicyTwoStep";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendWelcomeEmailAsync(User user)
    {
        var message = CreateDefaultMessage("Welcome to Bitwarden!", user.Email);
        var model = new BaseMailModel
        {
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "Welcome", model);
        message.Category = "Welcome";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendPasswordlessSignInAsync(string returnUrl, string token, string email)
    {
        var message = CreateDefaultMessage("[Admin] Continue Logging In", email);
        var url = CoreHelpers.ExtendQuery(new Uri($"{_globalSettings.BaseServiceUri.Admin}/login/confirm"),
            new Dictionary<string, string>
            {
                ["returnUrl"] = returnUrl,
                ["email"] = email,
                ["token"] = token,
            });
        var model = new PasswordlessSignInModel
        {
            Url = url.ToString()
        };
        await AddMessageContentAsync(message, "PasswordlessSignIn", model);
        message.Category = "PasswordlessSignIn";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendInvoiceUpcomingAsync(string email, decimal amount, DateTime dueDate,
        List<string> items, bool mentionInvoices)
    {
        var message = CreateDefaultMessage("Your Subscription Will Renew Soon", email);
        var model = new InvoiceUpcomingViewModel
        {
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
            AmountDue = amount,
            DueDate = dueDate,
            Items = items,
            MentionInvoices = mentionInvoices
        };
        await AddMessageContentAsync(message, "InvoiceUpcoming", model);
        message.Category = "InvoiceUpcoming";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendPaymentFailedAsync(string email, decimal amount, bool mentionInvoices)
    {
        var message = CreateDefaultMessage("Payment Failed", email);
        var model = new PaymentFailedViewModel
        {
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
            Amount = amount,
            MentionInvoices = mentionInvoices
        };
        await AddMessageContentAsync(message, "PaymentFailed", model);
        message.Category = "PaymentFailed";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendAddedCreditAsync(string email, decimal amount)
    {
        var message = CreateDefaultMessage("Account Credit Payment Processed", email);
        var model = new AddedCreditViewModel
        {
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
            Amount = amount
        };
        await AddMessageContentAsync(message, "AddedCredit", model);
        message.Category = "AddedCredit";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendLicenseExpiredAsync(IEnumerable<string> emails, string organizationName = null)
    {
        var message = CreateDefaultMessage("License Expired", emails);
        var model = new LicenseExpiredViewModel
        {
            OrganizationName = CoreHelpers.SanitizeForEmail(organizationName, false),
        };
        await AddMessageContentAsync(message, "LicenseExpired", model);
        message.Category = "LicenseExpired";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendNewDeviceLoggedInEmail(string email, string deviceType, DateTime timestamp, string ip)
    {
        var message = CreateDefaultMessage($"New Device Logged In From {deviceType}", email);
        var model = new NewDeviceLoggedInModel
        {
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
            DeviceType = deviceType,
            TheDate = timestamp.ToLongDateString(),
            TheTime = timestamp.ToShortTimeString(),
            TimeZone = "UTC",
            IpAddress = ip
        };
        await AddMessageContentAsync(message, "NewDeviceLoggedIn", model);
        message.Category = "NewDeviceLoggedIn";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendRecoverTwoFactorEmail(string email, DateTime timestamp, string ip)
    {
        var message = CreateDefaultMessage($"Recover 2FA From {ip}", email);
        var model = new RecoverTwoFactorModel
        {
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
            TheDate = timestamp.ToLongDateString(),
            TheTime = timestamp.ToShortTimeString(),
            TimeZone = "UTC",
            IpAddress = ip
        };
        await AddMessageContentAsync(message, "RecoverTwoFactor", model);
        message.Category = "RecoverTwoFactor";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendOrganizationUserRemovedForPolicySingleOrgEmailAsync(string organizationName, string email)
    {
        var message = CreateDefaultMessage($"You have been removed from {organizationName}", email);
        var model = new OrganizationUserRemovedForPolicySingleOrgViewModel
        {
            OrganizationName = CoreHelpers.SanitizeForEmail(organizationName, false),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "OrganizationUserRemovedForPolicySingleOrg", model);
        message.Category = "OrganizationUserRemovedForPolicySingleOrg";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendEnqueuedMailMessageAsync(IMailQueueMessage queueMessage)
    {
        var message = CreateDefaultMessage(queueMessage.Subject, queueMessage.ToEmails);
        message.BccEmails = queueMessage.BccEmails;
        message.Category = queueMessage.Category;
        await AddMessageContentAsync(message, queueMessage.TemplateName, queueMessage.Model);
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendAdminResetPasswordEmailAsync(string email, string userName, string orgName)
    {
        var message = CreateDefaultMessage("Master Password Has Been Changed", email);
        var model = new AdminResetPasswordViewModel()
        {
            UserName = GetUserIdentifier(email, userName),
            OrgName = CoreHelpers.SanitizeForEmail(orgName, false),
        };
        await AddMessageContentAsync(message, "AdminResetPassword", model);
        message.Category = "AdminResetPassword";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    private Task EnqueueMailAsync(IMailQueueMessage queueMessage) =>
        _mailEnqueuingService.EnqueueAsync(queueMessage, SendEnqueuedMailMessageAsync);

    private Task EnqueueMailAsync(IEnumerable<IMailQueueMessage> queueMessages) =>
        _mailEnqueuingService.EnqueueManyAsync(queueMessages, SendEnqueuedMailMessageAsync);

    private MailMessage CreateDefaultMessage(string subject, string toEmail)
    {
        return CreateDefaultMessage(subject, new List<string> { toEmail });
    }

    private MailMessage CreateDefaultMessage(string subject, IEnumerable<string> toEmails)
    {
        return new MailMessage
        {
            ToEmails = toEmails,
            Subject = subject,
            MetaData = new Dictionary<string, object>()
        };
    }

    private async Task AddMessageContentAsync<T>(MailMessage message, string templateName, T model)
    {
        message.HtmlContent = await RenderAsync($"{templateName}.html", model);
        message.TextContent = await RenderAsync($"{templateName}.text", model);
    }

    private async Task<string> RenderAsync<T>(string templateName, T model)
    {
        await RegisterHelpersAndPartialsAsync();
        if (!_templateCache.TryGetValue(templateName, out var template))
        {
            var source = await ReadSourceAsync(templateName);
            if (source != null)
            {
                template = Handlebars.Compile(source);
                _templateCache.Add(templateName, template);
            }
        }
        return template != null ? template(model) : null;
    }

    private async Task<string> ReadSourceAsync(string templateName)
    {
        var assembly = typeof(HandlebarsMailService).GetTypeInfo().Assembly;
        var fullTemplateName = $"{Namespace}.{templateName}.hbs";
        if (!assembly.GetManifestResourceNames().Any(f => f == fullTemplateName))
        {
            return null;
        }
        using (var s = assembly.GetManifestResourceStream(fullTemplateName))
        using (var sr = new StreamReader(s))
        {
            return await sr.ReadToEndAsync();
        }
    }

    private async Task RegisterHelpersAndPartialsAsync()
    {
        if (_registeredHelpersAndPartials)
        {
            return;
        }
        _registeredHelpersAndPartials = true;

        var basicHtmlLayoutSource = await ReadSourceAsync("Layouts.Basic.html");
        Handlebars.RegisterTemplate("BasicHtmlLayout", basicHtmlLayoutSource);
        var basicTextLayoutSource = await ReadSourceAsync("Layouts.Basic.text");
        Handlebars.RegisterTemplate("BasicTextLayout", basicTextLayoutSource);
        var fullHtmlLayoutSource = await ReadSourceAsync("Layouts.Full.html");
        Handlebars.RegisterTemplate("FullHtmlLayout", fullHtmlLayoutSource);
        var fullTextLayoutSource = await ReadSourceAsync("Layouts.Full.text");
        Handlebars.RegisterTemplate("FullTextLayout", fullTextLayoutSource);
        var titleContactUsHtmlLayoutSource = await ReadSourceAsync("Layouts.TitleContactUs.html");
        Handlebars.RegisterTemplate("TitleContactUsHtmlLayout", titleContactUsHtmlLayoutSource);
        var titleContactUsTextLayoutSource = await ReadSourceAsync("Layouts.TitleContactUs.text");
        Handlebars.RegisterTemplate("TitleContactUsTextLayout", titleContactUsTextLayoutSource);

        Handlebars.RegisterHelper("date", (writer, context, parameters) =>
        {
            if (parameters.Length == 0 || !(parameters[0] is DateTime))
            {
                writer.WriteSafeString(string.Empty);
                return;
            }
            if (parameters.Length > 0 && parameters[1] is string)
            {
                writer.WriteSafeString(((DateTime)parameters[0]).ToString(parameters[1].ToString()));
            }
            else
            {
                writer.WriteSafeString(((DateTime)parameters[0]).ToString());
            }
        });

        Handlebars.RegisterHelper("usd", (writer, context, parameters) =>
        {
            if (parameters.Length == 0 || !(parameters[0] is decimal))
            {
                writer.WriteSafeString(string.Empty);
                return;
            }
            writer.WriteSafeString(((decimal)parameters[0]).ToString("C"));
        });

        Handlebars.RegisterHelper("link", (writer, context, parameters) =>
        {
            if (parameters.Length == 0)
            {
                writer.WriteSafeString(string.Empty);
                return;
            }

            var text = parameters[0].ToString();
            var href = text;
            var clickTrackingOff = false;
            if (parameters.Length == 2)
            {
                if (parameters[1] is string)
                {
                    var p1 = parameters[1].ToString();
                    if (p1 == "true" || p1 == "false")
                    {
                        clickTrackingOff = p1 == "true";
                    }
                    else
                    {
                        href = p1;
                    }
                }
                else if (parameters[1] is bool)
                {
                    clickTrackingOff = (bool)parameters[1];
                }
            }
            else if (parameters.Length > 2)
            {
                if (parameters[1] is string)
                {
                    href = parameters[1].ToString();
                }
                if (parameters[2] is string)
                {
                    var p2 = parameters[2].ToString();
                    if (p2 == "true" || p2 == "false")
                    {
                        clickTrackingOff = p2 == "true";
                    }
                }
                else if (parameters[2] is bool)
                {
                    clickTrackingOff = (bool)parameters[2];
                }
            }

            var clickTrackingText = (clickTrackingOff ? "clicktracking=off" : string.Empty);
            writer.WriteSafeString($"<a href=\"{href}\" target=\"_blank\" {clickTrackingText}>{text}</a>");
        });
    }

    public async Task SendEmergencyAccessInviteEmailAsync(EmergencyAccess emergencyAccess, string name, string token)
    {
        var message = CreateDefaultMessage($"Emergency Access Contact Invite", emergencyAccess.Email);
        var model = new EmergencyAccessInvitedViewModel
        {
            Name = CoreHelpers.SanitizeForEmail(name),
            Email = WebUtility.UrlEncode(emergencyAccess.Email),
            Id = emergencyAccess.Id.ToString(),
            Token = WebUtility.UrlEncode(token),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "EmergencyAccessInvited", model);
        message.Category = "EmergencyAccessInvited";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendEmergencyAccessAcceptedEmailAsync(string granteeEmail, string email)
    {
        var message = CreateDefaultMessage($"Accepted Emergency Access", email);
        var model = new EmergencyAccessAcceptedViewModel
        {
            GranteeEmail = granteeEmail,
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "EmergencyAccessAccepted", model);
        message.Category = "EmergencyAccessAccepted";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendEmergencyAccessConfirmedEmailAsync(string grantorName, string email)
    {
        var message = CreateDefaultMessage($"You Have Been Confirmed as Emergency Access Contact", email);
        var model = new EmergencyAccessConfirmedViewModel
        {
            Name = CoreHelpers.SanitizeForEmail(grantorName),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "EmergencyAccessConfirmed", model);
        message.Category = "EmergencyAccessConfirmed";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendEmergencyAccessRecoveryInitiated(EmergencyAccess emergencyAccess, string initiatingName, string email)
    {
        var message = CreateDefaultMessage("Emergency Access Initiated", email);

        var remainingTime = DateTime.UtcNow - emergencyAccess.RecoveryInitiatedDate.GetValueOrDefault();

        var model = new EmergencyAccessRecoveryViewModel
        {
            Name = CoreHelpers.SanitizeForEmail(initiatingName),
            Action = emergencyAccess.Type.ToString(),
            DaysLeft = emergencyAccess.WaitTimeDays - Convert.ToInt32((remainingTime).TotalDays),
        };
        await AddMessageContentAsync(message, "EmergencyAccessRecovery", model);
        message.Category = "EmergencyAccessRecovery";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendEmergencyAccessRecoveryApproved(EmergencyAccess emergencyAccess, string approvingName, string email)
    {
        var message = CreateDefaultMessage("Emergency Access Approved", email);
        var model = new EmergencyAccessApprovedViewModel
        {
            Name = CoreHelpers.SanitizeForEmail(approvingName),
        };
        await AddMessageContentAsync(message, "EmergencyAccessApproved", model);
        message.Category = "EmergencyAccessApproved";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendEmergencyAccessRecoveryRejected(EmergencyAccess emergencyAccess, string rejectingName, string email)
    {
        var message = CreateDefaultMessage("Emergency Access Rejected", email);
        var model = new EmergencyAccessRejectedViewModel
        {
            Name = CoreHelpers.SanitizeForEmail(rejectingName),
        };
        await AddMessageContentAsync(message, "EmergencyAccessRejected", model);
        message.Category = "EmergencyAccessRejected";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendEmergencyAccessRecoveryReminder(EmergencyAccess emergencyAccess, string initiatingName, string email)
    {
        var message = CreateDefaultMessage("Pending Emergency Access Request", email);

        var remainingTime = DateTime.UtcNow - emergencyAccess.RecoveryInitiatedDate.GetValueOrDefault();

        var model = new EmergencyAccessRecoveryViewModel
        {
            Name = CoreHelpers.SanitizeForEmail(initiatingName),
            Action = emergencyAccess.Type.ToString(),
            DaysLeft = emergencyAccess.WaitTimeDays - Convert.ToInt32((remainingTime).TotalDays),
        };
        await AddMessageContentAsync(message, "EmergencyAccessRecoveryReminder", model);
        message.Category = "EmergencyAccessRecoveryReminder";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendEmergencyAccessRecoveryTimedOut(EmergencyAccess emergencyAccess, string initiatingName, string email)
    {
        var message = CreateDefaultMessage("Emergency Access Granted", email);
        var model = new EmergencyAccessRecoveryTimedOutViewModel
        {
            Name = CoreHelpers.SanitizeForEmail(initiatingName),
            Action = emergencyAccess.Type.ToString(),
        };
        await AddMessageContentAsync(message, "EmergencyAccessRecoveryTimedOut", model);
        message.Category = "EmergencyAccessRecoveryTimedOut";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendProviderSetupInviteEmailAsync(Provider provider, string token, string email)
    {
        var message = CreateDefaultMessage($"Create a Provider", email);
        var model = new ProviderSetupInviteViewModel
        {
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
            ProviderId = provider.Id.ToString(),
            Email = WebUtility.UrlEncode(email),
            Token = WebUtility.UrlEncode(token),
        };
        await AddMessageContentAsync(message, "Provider.ProviderSetupInvite", model);
        message.Category = "ProviderSetupInvite";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendProviderInviteEmailAsync(string providerName, ProviderUser providerUser, string token, string email)
    {
        var message = CreateDefaultMessage($"Join {providerName}", email);
        var model = new ProviderUserInvitedViewModel
        {
            ProviderName = CoreHelpers.SanitizeForEmail(providerName),
            Email = WebUtility.UrlEncode(providerUser.Email),
            ProviderId = providerUser.ProviderId.ToString(),
            ProviderUserId = providerUser.Id.ToString(),
            ProviderNameUrlEncoded = WebUtility.UrlEncode(providerName),
            Token = WebUtility.UrlEncode(token),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
        };
        await AddMessageContentAsync(message, "Provider.ProviderUserInvited", model);
        message.Category = "ProviderSetupInvite";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendProviderConfirmedEmailAsync(string providerName, string email)
    {
        var message = CreateDefaultMessage($"You Have Been Confirmed To {providerName}", email);
        var model = new ProviderUserConfirmedViewModel
        {
            ProviderName = CoreHelpers.SanitizeForEmail(providerName),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "Provider.ProviderUserConfirmed", model);
        message.Category = "ProviderUserConfirmed";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendProviderUserRemoved(string providerName, string email)
    {
        var message = CreateDefaultMessage($"You Have Been Removed from {providerName}", email);
        var model = new ProviderUserRemovedViewModel
        {
            ProviderName = CoreHelpers.SanitizeForEmail(providerName),
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName
        };
        await AddMessageContentAsync(message, "Provider.ProviderUserRemoved", model);
        message.Category = "ProviderUserRemoved";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendUpdatedTempPasswordEmailAsync(string email, string userName)
    {
        var message = CreateDefaultMessage("Master Password Has Been Changed", email);
        var model = new UpdateTempPasswordViewModel()
        {
            UserName = GetUserIdentifier(email, userName)
        };
        await AddMessageContentAsync(message, "UpdatedTempPassword", model);
        message.Category = "UpdatedTempPassword";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendFamiliesForEnterpriseOfferEmailAsync(string sponsorOrgName, string email, bool existingAccount, string token) =>
        await BulkSendFamiliesForEnterpriseOfferEmailAsync(sponsorOrgName, new[] { (email, existingAccount, token) });

    public async Task BulkSendFamiliesForEnterpriseOfferEmailAsync(string sponsorOrgName, IEnumerable<(string Email, bool ExistingAccount, string Token)> invites)
    {
        MailQueueMessage CreateMessage((string Email, bool ExistingAccount, string Token) invite)
        {
            var message = CreateDefaultMessage("Accept Your Free Families Subscription", invite.Email);
            message.Category = "FamiliesForEnterpriseOffer";
            var model = new FamiliesForEnterpriseOfferViewModel
            {
                SponsorOrgName = sponsorOrgName,
                SponsoredEmail = WebUtility.UrlEncode(invite.Email),
                ExistingAccount = invite.ExistingAccount,
                WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
                SiteName = _globalSettings.SiteName,
                SponsorshipToken = invite.Token,
            };
            var templateName = invite.ExistingAccount ?
                "FamiliesForEnterprise.FamiliesForEnterpriseOfferExistingAccount" :
                "FamiliesForEnterprise.FamiliesForEnterpriseOfferNewAccount";

            return new MailQueueMessage(message, templateName, model);
        }
        var messageModels = invites.Select(invite => CreateMessage(invite));
        await EnqueueMailAsync(messageModels);
    }

    public async Task SendFamiliesForEnterpriseRedeemedEmailsAsync(string familyUserEmail, string sponsorEmail)
    {
        // Email family user
        await SendFamiliesForEnterpriseInviteRedeemedToFamilyUserEmailAsync(familyUserEmail);

        // Email enterprise org user
        await SendFamiliesForEnterpriseInviteRedeemedToEnterpriseUserEmailAsync(sponsorEmail);
    }

    private async Task SendFamiliesForEnterpriseInviteRedeemedToFamilyUserEmailAsync(string email)
    {
        var message = CreateDefaultMessage("Success! Families Subscription Accepted", email);
        await AddMessageContentAsync(message, "FamiliesForEnterprise.FamiliesForEnterpriseRedeemedToFamilyUser", new BaseMailModel());
        message.Category = "FamilyForEnterpriseRedeemedToFamilyUser";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    private async Task SendFamiliesForEnterpriseInviteRedeemedToEnterpriseUserEmailAsync(string email)
    {
        var message = CreateDefaultMessage("Success! Families Subscription Accepted", email);
        await AddMessageContentAsync(message, "FamiliesForEnterprise.FamiliesForEnterpriseRedeemedToEnterpriseUser", new BaseMailModel());
        message.Category = "FamilyForEnterpriseRedeemedToEnterpriseUser";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendFamiliesForEnterpriseSponsorshipRevertingEmailAsync(string email, DateTime expirationDate)
    {
        var message = CreateDefaultMessage("Your Families Sponsorship was Removed", email);
        var model = new FamiliesForEnterpriseSponsorshipRevertingViewModel
        {
            ExpirationDate = expirationDate,
        };
        await AddMessageContentAsync(message, "FamiliesForEnterprise.FamiliesForEnterpriseSponsorshipReverting", model);
        message.Category = "FamiliesForEnterpriseSponsorshipReverting";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendOTPEmailAsync(string email, string token)
    {
        var message = CreateDefaultMessage("Your Bitwarden Verification Code", email);
        var model = new EmailTokenViewModel
        {
            Token = token,
            WebVaultUrl = _globalSettings.BaseServiceUri.VaultWithHash,
            SiteName = _globalSettings.SiteName,
        };
        await AddMessageContentAsync(message, "OTPEmail", model);
        message.MetaData.Add("SendGridBypassListManagement", true);
        message.Category = "OTP";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendFailedLoginAttemptsEmailAsync(string email, DateTime utcNow, string ip)
    {
        var message = CreateDefaultMessage("Failed login attempts detected", email);
        var model = new FailedAuthAttemptsModel()
        {
            TheDate = utcNow.ToLongDateString(),
            TheTime = utcNow.ToShortTimeString(),
            TimeZone = "UTC",
            IpAddress = ip,
            AffectedEmail = email

        };
        await AddMessageContentAsync(message, "FailedLoginAttempts", model);
        message.Category = "FailedLoginAttempts";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendFailedTwoFactorAttemptsEmailAsync(string email, DateTime utcNow, string ip)
    {
        var message = CreateDefaultMessage("Failed login attempts detected", email);
        var model = new FailedAuthAttemptsModel()
        {
            TheDate = utcNow.ToLongDateString(),
            TheTime = utcNow.ToShortTimeString(),
            TimeZone = "UTC",
            IpAddress = ip,
            AffectedEmail = email

        };
        await AddMessageContentAsync(message, "FailedTwoFactorAttempts", model);
        message.Category = "FailedTwoFactorAttempts";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    public async Task SendUnverifiedOrganizationDomainEmailAsync(IEnumerable<string> adminEmails, string organizationId, string domainName)
    {
        var message = CreateDefaultMessage("Domain not verified", adminEmails);
        var model = new OrganizationDomainUnverifiedViewModel
        {
            Url = $"{_globalSettings.BaseServiceUri.VaultWithHash}/organizations/{organizationId}/settings/domain-verification",
            DomainName = domainName
        };
        await AddMessageContentAsync(message, "OrganizationDomainUnverified", model);
        message.Category = "UnverifiedOrganizationDomain";
        await _mailDeliveryService.SendEmailAsync(message);
    }

    private static string GetUserIdentifier(string email, string userName)
    {
        return string.IsNullOrEmpty(userName) ? email : CoreHelpers.SanitizeForEmail(userName, false);
    }
}