//Send email with Multiple attachments, and before sending edit template
public class SendEmail {

    public Account acc;
    public String body { get; set; }    
    Product_EmailTemplates__c template;//Custom settings to read the template, which template to send
    public Opportunity opp { get; set;}
    public String subject { get; set; }
    public String htmlBody {get; set;}
    

    // Create a constructor that populates the Opportunity object
    public SendEmail(ApexPages.StandardController controller) {        
        opp = [Select Id, Name, Email__c, Amount, Contact_Name__c, Account.PersonContactId, Account.id, Product__r.Name, Account.Name, StageName, Tax_Amount__c, Total_after_Tax__c, 
               payment_1_Amount__c, Payment_2_Amount__c, Payment_3_Amount__c, Payment_1_Before_Tax__c, Payment_2_Before_Tax__c, Payment_3_Before_Tax__c, Payment_1_Tax_Amount__c, 
               Payment_2_Tax_Amount__c, Payment_3_Tax_Amount__c, Potential_Number__c,Branch_Name__c, Branch_Name__r.Name, Branch_Name__r.Address_1__c, Branch_Name__r.Address_2__c, Branch_Name__r.City__c, 
               Branch_Name__r.Country__c, Branch_Name__r.Main_Phone_1__c, Branch_Name__r.Main_Phone_2__c, Branch_Name__r.Main_Phone_3__c, Branch_Name__r.Region__c, Branch_Name__r.State__c, 
               Branch_Name__r.Zip_Postal_Code__c, Product__r.Product_Type__c, Admin_Fee__c, Payment_1_plus_Admin_Fee__c
                    from Opportunity where Id = :ApexPages.currentPage().getParameters().get('id')];
              
        EmailTemplate emailTemplate = [SELECT Id, Subject, HtmlValue, Body FROM EmailTemplate WHERE Id = :getTemplateId(opp.Product__r.Name, opp.Product__r.Product_Type__c)];
    
        htmlBody = emailTemplate.HtmlValue;
        subject = emailTemplate.subject;
    }
    
    //Send the email with two attachments
    public PageReference send() {
        // Define the email
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
        
        //Send email if Branch not equals to Saudi Arabia and Product type is Standard
        if(opp.Branch_Name__r.Name != 'Saudi Arabia' && opp.Product__r.Product_Type__c == 'Standard'){
            // Reference the attachment page and pass in the Opportunity ID
            PageReference pdf1 =  Page.CCLPdf;//CCLPdf is a Visualforce page
            pdf1.getParameters().put('id',opp.id); 
            pdf1.setRedirect(true);
    
            // Take the PDF content
            Blob b1 = pdf1.getContentAsPDF();
            
            PageReference pdf2 =  Page.ProformaInvoicePdf;//ProformaInvoicePdf is a Visualforce page
            pdf2.getParameters().put('id',opp.id); 
            pdf2.setRedirect(true);
    
            // Take the PDF content
            Blob b2 = pdf2.getContentAsPDF();
    
            // Create the email attachment
            Messaging.EmailFileAttachment efa1 = new Messaging.EmailFileAttachment();
            efa1.setFileName(opp.account.Name+'-CCL.pdf');//set the email attachment name
            efa1.setBody(b1);
            
            Messaging.EmailFileAttachment efa2 = new Messaging.EmailFileAttachment();
            efa2.setFileName(opp.account.Name+'-Invoice.pdf');//set the email attachment name
            efa2.setBody(b2);
            
            // Sets the paramaters of the email
            email.setSubject(subject);//Auto populate the Subject from Template
            email.setHtmlBody(htmlBody);//Auto populate the Body from Template
            //email.setTemplateId('00Xj0000000Yg9k');//getTemplateId(opp.Product__r.Name)
            email.setTargetObjectId(opp.Account.PersonContactId);
            email.setSaveAsActivity(true);
            email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa1,efa2});
            StoringAttachments();
        }
        
        //Send email if Branch not equals to Saudi Arabia and Product type is Canada
        if(opp.Branch_Name__r.Name != 'Saudi Arabia' && opp.Product__r.Product_Type__c == 'Canada'){
            // Reference the attachment page and pass in the Opportunity ID
            PageReference pdf3 =  Page.CANCCLPdf;//CANCCLPdf is a Visualforce page
            pdf3.getParameters().put('id',opp.id); 
            pdf3.setRedirect(true);
    
            // Take the PDF content
            Blob b3 = pdf3.getContentAsPDF();
            
            PageReference pdf4 =  Page.ProformaInvoicePdf;//ProformaInvoicePdf is a Visualforce page
            pdf4.getParameters().put('id',opp.id); 
            pdf4.setRedirect(true);
    
            // Take the PDF content
            Blob b4 = pdf4.getContentAsPDF();
    
            // Create the email attachment
            Messaging.EmailFileAttachment efa3 = new Messaging.EmailFileAttachment();
            efa3.setFileName(opp.account.Name+'-CANCCL.pdf');//set the email attachment name
            efa3.setBody(b3);
            
            Messaging.EmailFileAttachment efa4 = new Messaging.EmailFileAttachment();
            efa4.setFileName(opp.account.Name+'-CANInvoice.pdf');//set the email attachment name
            efa4.setBody(b4);
            
            // Sets the paramaters of the email
            email.setSubject(subject);//Auto populate the Subject from Template
            email.setHtmlBody(htmlBody);//Auto populate the Body from Template
            //email.setTemplateId('00Xj0000000Yg9k');//getTemplateId(opp.Product__r.Name)
            email.setTargetObjectId(opp.Account.PersonContactId);
            email.setSaveAsActivity(true);
            email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa3,efa4});
            StoringAttachments();
        }
        
        //Send email if Branch is saudi Arabia and Product type is Standard
        if(opp.Branch_Name__r.Name == 'Saudi Arabia' && opp.Product__r.Product_Type__c == 'Standard'){
            // Reference the attachment page and pass in the Opportunity ID
            PageReference pdf5 =  Page.KSACCLPdf;//KSACCLPdf is a Visualforce page
            pdf5.getParameters().put('id',opp.id); 
            pdf5.setRedirect(true);
    
            // Take the PDF content
            Blob b5 = pdf5.getContentAsPDF();
            
            PageReference pdf6 =  Page.ProformaInvoicePdf;//ProformaInvoicePdf is a Visualforce page
            pdf6.getParameters().put('id',opp.id); 
            pdf6.setRedirect(true);
    
            // Take the PDF content
            Blob b6 = pdf6.getContentAsPDF();
    
            // Create the email attachment
            Messaging.EmailFileAttachment efa5 = new Messaging.EmailFileAttachment();
            efa5.setFileName(opp.account.Name+'-KSACCL.pdf');//set the email attachment name
            efa5.setBody(b5);
            
            Messaging.EmailFileAttachment efa6 = new Messaging.EmailFileAttachment();
            efa6.setFileName(opp.account.Name+'-KSAInvoice.pdf');//set the email attachment name
            efa6.setBody(b6);
            
            // Sets the paramaters of the email
            email.setSubject(subject);//Auto populate the Subject from Template
            email.setHtmlBody(htmlBody);//Auto populate the Body from Template
            //email.setTemplateId('00Xj0000000Yg9k');//getTemplateId(opp.Product__r.Name)
            email.setTargetObjectId(opp.Account.PersonContactId);
            email.setSaveAsActivity(true);
            email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa5,efa6});
            StoringAttachments();
         } 
         
         //Send email if Branch is saudi Arabia and Product type is Canada
         if(opp.Branch_Name__r.Name == 'Saudi Arabia' && opp.Product__r.Product_Type__c == 'Canada'){
            // Reference the attachment page and pass in the Opportunity ID
            PageReference pdf7 =  Page.KSACANCCLPdf;//KSACANCCLPdf is a Visualforce page
            pdf7.getParameters().put('id',opp.id); 
            pdf7.setRedirect(true);
    
            // Take the PDF content
            Blob b7 = pdf7.getContentAsPDF();
            
            PageReference pdf8 =  Page.ProformaInvoicePdf;//ProformaInvoicePdf is a Visualforce page
            pdf8.getParameters().put('id',opp.id); 
            pdf8.setRedirect(true);
    
            // Take the PDF content
            Blob b8 = pdf8.getContentAsPDF();
    
            // Create the email attachment
            Messaging.EmailFileAttachment efa7 = new Messaging.EmailFileAttachment();
            efa7.setFileName(opp.account.Name+'-KSACANCCL.pdf');//set the email attachment name
            efa7.setBody(b7);
            
            Messaging.EmailFileAttachment efa8 = new Messaging.EmailFileAttachment();
            efa8.setFileName(opp.account.Name+'-KSACANInvoice.pdf');//set the email attachment name
            efa8.setBody(b8);
            
            // Sets the paramaters of the email
            email.setSubject(subject);//Auto populate the Subject from Template
            email.setHtmlBody(htmlBody);//Auto populate the Body from Template
            //email.setTemplateId('00Xj0000000Yg9k');//getTemplateId(opp.Product__r.Name)
            email.setTargetObjectId(opp.Account.PersonContactId);
            email.setSaveAsActivity(true);
            email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa7,efa8});
            StoringAttachments();
         } 
    
            // Sends the email
            Messaging.SendEmailResult [] r = 
                Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email}); 
        
        
        return new PageReference('/'+opp.Id);
    }
    
    //Creating attachments
    public void StoringAttachments() {
        //Send attachments if Branch is India and Product type is Standard
        if((opp.Branch_Name__r.Name == 'India' || opp.Branch_Name__r.Name == 'United Kingdom') && opp.Product__r.Product_Type__c == 'Standard'){
            Attachment myAttach1 = new Attachment();
            myAttach1.ParentId = opp.Account.PersonContactId;
            myAttach1.name = opp.account.Name+'-CCL.pdf';
            PageReference myPdf1 = Page.CCLPdf;
            myAttach1.body = myPdf1.getContentAsPdf();
            insert myAttach1;
            
            Attachment myAttach2 = new Attachment();
            myAttach2.ParentId = opp.Account.PersonContactId;
            myAttach2.name = opp.account.Name+'-Invoice.pdf';
            PageReference myPdf2 = Page.ProformaInvoicePdf;
            myAttach2.body = myPdf2.getContentAsPdf();
            insert myAttach2;
        }
        
        //Send attachments if Branch is India and Product type is Canada
        if((opp.Branch_Name__r.Name == 'India' || opp.Branch_Name__r.Name == 'United Kingdom') && opp.Product__r.Product_Type__c == 'Canada'){
            Attachment myAttach3 = new Attachment();
            myAttach3.ParentId = opp.Account.PersonContactId;
            myAttach3.name = opp.account.Name+'-CANCCL.pdf';
            PageReference myPdf3 = Page.CANCCLPdf;
            myAttach3.body = myPdf3.getContentAsPdf();
            insert myAttach3;
            
            Attachment myAttach4 = new Attachment();
            myAttach4.ParentId = opp.Account.PersonContactId;
            myAttach4.name = opp.account.Name+'-CANInvoice.pdf';
            PageReference myPdf4 = Page.ProformaInvoicePdf;
            myAttach4.body = myPdf4.getContentAsPdf();
            insert myAttach4;
        }
        
        //Send attachments if Branch is saudi Arabia and Product type is Standard
        if(opp.Branch_Name__r.Name == 'Saudi Arabia' && opp.Product__r.Product_Type__c == 'Standard'){
            Attachment myAttach5 = new Attachment();
            myAttach5.ParentId = opp.Account.PersonContactId;
            myAttach5.name = opp.account.Name+'-KSACCL.pdf';
            PageReference myPdf5 = Page.KSACCLPdf;
            myAttach5.body = myPdf5.getContentAsPdf();
            insert myAttach5;
            
            Attachment myAttach6 = new Attachment();
            myAttach6.ParentId = opp.Account.PersonContactId;
            myAttach6.name = opp.account.Name+'-KSAInvoice.pdf';
            PageReference myPdf6 = Page.ProformaInvoicePdf;
            myAttach6.body = myPdf6.getContentAsPdf();
            insert myAttach6;
        }
        
        //Send attachments if Branch is saudi Arabia and Product type is Canada
        if(opp.Branch_Name__r.Name == 'Saudi Arabia' && opp.Product__r.Product_Type__c == 'Canada'){
            Attachment myAttach7 = new Attachment();
            myAttach7.ParentId = opp.Account.PersonContactId;
            myAttach7.name = opp.account.Name+'-KSACANCCL.pdf';
            PageReference myPdf7 = Page.KSACANCCLPdf;
            myAttach7.body = myPdf7.getContentAsPdf();
            insert myAttach7;
            
            Attachment myAttach8 = new Attachment();
            myAttach8.ParentId = opp.Account.PersonContactId;
            myAttach8.name = opp.account.Name+'-KSACANInvoice.pdf';
            PageReference myPdf8 = Page.ProformaInvoicePdf;
            myAttach8.body = myPdf8.getContentAsPdf();
            insert myAttach8;
        }
    } 
    
    //Reads the Template from Custom settings        
    public String getTemplateId(String prodName, String prodType){
       template = [Select Name, Email_Template_Id__c, Product_Type__c from Product_EmailTemplates__c 
                        where Name = : prodName and Product_Type__c = : prodType];
       return template.Email_Template_Id__c;
   }

}