[MM-43399] Cloud Delinquency Email Sequence (#20814)

* Add DelinquentSince to Subscription fields

* Stashing, migrating

* Adding file

* Adding many email templates

* Fix templates pipeline

* Fix translations

* Fix mocks

* Many changes

* Adjust mocks

* Update i18n/en.json

Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>

* PR fixes

* Update string

* Update i18n/en.json

Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>

* Update URL's for buttons to open the delinquency modal

* Update emails from mjml

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>

app/cloud.go

@@ -148,6 +148,87 @@ func (a *App) SendPaymentFailedEmail(failedPayment *model.FailedPayment) *model.
 	return nil
 }
 
+func getCurrentProduct(subscriptionProductID string, products []*model.Product) *model.Product {
+	for _, product := range products {
+		if product.ID == subscriptionProductID {
+			return product
+		}
+	}
+	return nil
+}
+
+func (a *App) SendDelinquencyEmail(emailToSend model.DelinquencyEmail) *model.AppError {
+	sysAdmins, aErr := a.getSysAdminsEmailRecipients()
+	if aErr != nil {
+		return aErr
+	}
+	subscription, err := a.Cloud().GetSubscription("")
+	if err != nil {
+		return model.NewAppError("SendDelinquencyEmail", "app.cloud.get_subscription.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	if subscription == nil {
+		return model.NewAppError("SendDelinquencyEmail", "app.cloud.get_subscription.app_error", nil, "", http.StatusInternalServerError)
+	}
+
+	products, err := a.Cloud().GetCloudProducts("", false)
+	if err != nil {
+		return model.NewAppError("SendDelinquencyEmail", "app.cloud.get_cloud_products.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	if products == nil {
+		return model.NewAppError("SendDelinquencyEmail", "app.cloud.get_cloud_products.app_error", nil, "", http.StatusInternalServerError)
+	}
+
+	planName := getCurrentProduct(subscription.ProductID, products).Name
+
+	if subscription.DelinquentSince == nil {
+		return model.NewAppError("SendDelinquencyEmail", "app.cloud.get_subscription_delinquency_date.app_error", nil, "", http.StatusInternalServerError)
+	}
+
+	delinquentSince := time.Unix(*subscription.DelinquentSince, 0)
+
+	delinquencyDate := delinquentSince.Format("01/02/2006")
+	for _, admin := range sysAdmins {
+		switch emailToSend {
+		case model.DelinquencyEmail7:
+			err := a.Srv().EmailService.SendDelinquencyEmail7(admin.Email, admin.Locale, *a.Config().ServiceSettings.SiteURL, planName)
+			if err != nil {
+				a.Log().Error("Error sending delinquency email 7", mlog.Err(err))
+			}
+		case model.DelinquencyEmail14:
+			err := a.Srv().EmailService.SendDelinquencyEmail14(admin.Email, admin.Locale, *a.Config().ServiceSettings.SiteURL, planName)
+			if err != nil {
+				a.Log().Error("Error sending delinquency email 14", mlog.Err(err))
+			}
+		case model.DelinquencyEmail30:
+			err := a.Srv().EmailService.SendDelinquencyEmail30(admin.Email, admin.Locale, *a.Config().ServiceSettings.SiteURL, planName)
+			if err != nil {
+				a.Log().Error("Error sending delinquency email 30", mlog.Err(err))
+			}
+		case model.DelinquencyEmail45:
+			err := a.Srv().EmailService.SendDelinquencyEmail45(admin.Email, admin.Locale, *a.Config().ServiceSettings.SiteURL, planName, delinquencyDate)
+			if err != nil {
+				a.Log().Error("Error sending delinquency email 45", mlog.Err(err))
+			}
+		case model.DelinquencyEmail60:
+			err := a.Srv().EmailService.SendDelinquencyEmail60(admin.Email, admin.Locale, *a.Config().ServiceSettings.SiteURL)
+			if err != nil {
+				a.Log().Error("Error sending delinquency email 60", mlog.Err(err))
+			}
+		case model.DelinquencyEmail75:
+			err := a.Srv().EmailService.SendDelinquencyEmail75(admin.Email, admin.Locale, *a.Config().ServiceSettings.SiteURL, planName, delinquencyDate)
+			if err != nil {
+				a.Log().Error("Error sending delinquency email 75", mlog.Err(err))
+			}
+		case model.DelinquencyEmail90:
+			err := a.Srv().EmailService.SendDelinquencyEmail90(admin.Email, admin.Locale, *a.Config().ServiceSettings.SiteURL)
+			if err != nil {
+				a.Log().Error("Error sending delinquency email 90", mlog.Err(err))
+			}
+		}
+	}
+	return nil
+}
+
 func (a *App) AdjustInProductLimits(limits *model.ProductLimits, subscription *model.Subscription) *model.AppError {
 	if limits.Teams != nil && limits.Teams.Active != nil && *limits.Teams.Active > 0 {
 		err := a.AdjustTeamsFromProductLimits(limits.Teams)