/** Controller to add Contacts to Portfolio Suspect  **/
/** vf page - MultiselectContactAC **/
/** GSI Project **/
/** Owner - Shikha Mishra **/

public with sharing class AddContacttoAttributedCampaign{ 

    public AttributedCampaign__c attc;
    public ContactAttributedCampaign__c cac {get;set;} 
    public list<ContactAttributedCampaign__c> cacList{get;set;}
    public string attid; 
    public string accid; 
    @TestVisible public list<wrapContact> wrapContactList {get; set;} 
    public list<Contact> selectedContacts {get; set;}
    public integer totalRecs = 0;
    public integer index =0;
    public integer blockSize = 100; 
    public integer NoOfRecords = 1;
    public integer TotalPages;
    public integer sizeOfStartIndex;

    public AddContacttoAttributedCampaign(ApexPages.StandardController stdController)
  {
        this.attc = (AttributedCampaign__c)stdController.getRecord();
        attid =ApexPages.currentPage().getParameters().get('attid'); 
        accid =ApexPages.currentPage().getParameters().get('accid');
        cac = new ContactAttributedCampaign__c();
        attc = new AttributedCampaign__c ();
        for(AggregateResult result :[SELECT COUNT(Id) intVal FROM Contact where AccountId=:accid])
            {
                totalRecs+=(Integer)result.get('intVal');
            }
        TotalPages = totalRecs/blocksize;

        cacList = [Select Name, Attributed_Campaign__c, Contact__c, Include_in_Marketing_Activity__c from ContactAttributedCampaign__c where Attributed_Campaign__c =: attid order by Name];
      system.debug('cacList##'+cacList.size()) ;
      wrapContactList = new list<wrapContact>();
        for (contact c : [Select Id, Name, title, Job_Role__c, Job_Function__c from Contact where AccountId =: accid and Contact_Status__c = 'Active' Order by Name ASC LIMIT : blockSize OFFSET:index ])
        {
            wrapContactList.add(new wrapContact(c));
        }
         sizeOfStartIndex = wrapContactList.size();
  } 
public void beginning()
{   
    wrapContactList.clear();
    NoOfRecords =1;
    index = 0;
    for (contact c : [Select Id, Name, title, Job_Role__c, Job_Function__c from Contact where AccountId =: accid and Contact_Status__c = 'Active' Order by Name ASC LIMIT : blockSize OFFSET:index])
        {
            wrapContactList.add(new wrapContact(c));
        }
   
}

public void previous()
{
 wrapContactList.clear();   
 if(NoOfRecords > 1)
 {
   index = index - blocksize;
 for (contact c : [Select Id, Name, title, Job_Role__c, Job_Function__c from Contact where AccountId =: accid and Contact_Status__c = 'Active' Order by Name ASC LIMIT : blockSize OFFSET:index])         
        {
            wrapContactList.add(new wrapContact(c));
        }
     NoOfRecords=NoOfRecords -1 ;
     
 }
  else
  {
    beginning(); 
  }
}
public void next()
{   
 wrapContactList.clear();
   
    if(NoOfRecords < TotalPages)
    {
                 index = index + blocksize;
               system.debug('index value in last next--' + index);
                for (contact c : [Select Id, Name, title, Job_Role__c, Job_Function__c from Contact where AccountId =: accid and Contact_Status__c = 'Active' Order by Name ASC LIMIT : blockSize OFFSET:index])
                    {
                        wrapContactList.add(new wrapContact(c));
                    }
               // index = index + wrapContactList.size();
               NoOfRecords= NoOfRecords+1;
    }
    else
    {
        
       for (contact c : [Select Id, Name, title, Job_Role__c, Job_Function__c from Contact where AccountId =: accid and Contact_Status__c = 'Active' Order by Name ASC LIMIT : blockSize OFFSET:index])
                    {
                        wrapContactList.add(new wrapContact(c));
                    } 
        
    }
    
}

public void end()
{   
wrapContactList.clear();

if(NoOfRecords <=totalPages)
{index = totalRecs - blocksize;
 
for(contact c : [Select Id, Name, title, Job_Role__c, Job_Function__c from Contact where AccountId =: accid and Contact_Status__c = 'Active' Order by Name ASC LIMIT : blockSize OFFSET:index])
                {  wrapContactList.add(new wrapContact(c));} NoOfRecords = TotalPages;
         
   
}
}
    
public boolean getDisableNext()
{
    if(sizeOfStartIndex < blocksize)
      {
           return true;
       }
      else
       {
           return false;
      }
}


    
}

Public PageReference SavePage() 
{ 
        selectedContacts = new list<Contact>();
        Set<Id> cacID = new Set<Id>();
        for(ContactAttributedCampaign__c ca :cacList)
        {
            cacID.add(ca.Contact__c);
        }List<ContactAttributedCampaign__c> insertList = new List<ContactAttributedCampaign__c>();

        
        for(wrapContact wrapobj : wrapContactList){
            
            if(wrapobj.isSelected == true)
            {
                 if(!cacID.contains(wrapobj.conn.Id)){
                   ContactAttributedCampaign__c conac = new ContactAttributedCampaign__c(Attributed_Campaign__c=attid,Contact__c=wrapobj.conn.id,Include_in_Marketing_Activity__c=wrapobj.mark) ;
                   //conac.Attributed_Campaign__c = attid; 
                   //conac.Contact__c = wrapobj.conn.id; 
                   //conac.Include_in_Marketing_Activity__c= wrapobj.mark;
                   insertList.add(conac);
                 //  wrapobj.isSelected =False; 
           }
           
                     for(ContactAttributedCampaign__c item : cacList)
                       {if(item.Contact__c == wrapobj.conn.id && item.Include_in_Marketing_Activity__c != wrapobj.mark)
                           {ContactAttributedCampaign__c conac = [select id,Include_in_Marketing_Activity__c from ContactAttributedCampaign__c where Attributed_Campaign__c = :attid and Contact__c = :wrapobj.conn.id]; conac.Include_in_Marketing_Activity__c = wrapobj.mark; insertList.add(conac);
                             }
                         }
                 } 
            }
            upsert insertList;
            
     cacList = [Select Name, Attributed_Campaign__c, Contact__c, Include_in_Marketing_Activity__c  from ContactAttributedCampaign__c where Attributed_Campaign__c =: attid order by Name desc];
        
        return null;
        }
 
    public PageReference redirectBack(){
        return new PageReference('/'+attid);
    }


   @TestVisible public class wrapContact{
        public Contact conn{get; set;}
        public ContactAttributedCampaign__c cac{get;set;}
        public boolean isSelected {get; set;}
        public Boolean mark{get;set;}

            public wrapContact(Contact c){
                this.conn = c;
                this.isSelected = false;                
            }
            public wrapContact(ContactAttributedCampaign__c d){
                this.cac = d;
                this.isSelected = false;  
                this.mark  = d.Include_in_Marketing_Activity__c;
            }
    }    
}


VF Page - 

<apex:page standardController="AttributedCampaign__c" extensions="AddContacttoAttributedCampaign" showHeader="false" sidebar="false"> 
<apex:form id="frm"> 
    <apex:pageMessages />
    
 <apex:pageBlock title="Added Contacts">
     
   <apex:pageBlockTable value="{!cacList}" var="cac">
      <apex:column headerValue="Name" value="{!cac.Name}"/>
      <apex:column headerValue="Portfolio Suspect" value="{!cac.Attributed_Campaign__c}"/>
      <apex:column headerValue="Contact" value="{!cac.Contact__c}"/>
      <apex:column headerValue="Include in Marketing Activity" value="{!cac.Include_in_Marketing_Activity__c}"/>
   </apex:pageBlockTable> 
</apex:pageBlock>   
 
  <apex:pageBlock title="Add Contact to Portfolio Suspect" id="pb"> 
    <apex:pageMessages />
    
    <apex:pageBlock id="pb2">
    <apex:pageBlockSection columns="1">  
     <apex:outputPanel id="myPanel" layout="">
    <apex:pageBlockTable value="{!wrapContactList}" var="aconl">
        <apex:column >
        <apex:facet name="header">

        </apex:facet>
            <apex:inputCheckbox value="{!aconl.isSelected}" id="inputID"/>

        </apex:column>
        <apex:column headerValue="Name">
        <apex:outputfield value="{!aconl.conn.name}"/>
        </apex:column>
        <apex:column headerValue="Title">
        <apex:outputfield value="{!aconl.conn.Title}"/>
        </apex:column>
        <apex:column headerValue="Job Function">
        <apex:outputfield value="{!aconl.conn.Job_Function__c}"/>
        </apex:column>
        <apex:column headerValue="Job Role">
        <apex:outputfield value="{!aconl.conn.Job_Role__c}"/>
        </apex:column>
        <apex:column headerValue="Include in Marketing Activity">
        <apex:inputCheckbox value="{!aconl.mark}" />
        </apex:column>

    </apex:pageBlockTable>
</apex:outputPanel>
    </apex:pageBlockSection>  
    </apex:pageBlock>
    <apex:pageBlockButtons >      
        <apex:commandButton id="addContact" value="Add" action="{!SavePage}" style="align:center;"/>
        <apex:commandButton value="First Page" action="{!beginning}" disabled="{!DisableNext}" reRender="myPanel" />
        <apex:commandButton value="Next" action="{!next}" disabled="{!DisableNext}"   reRender="myPanel" />
         <apex:commandButton value="Prev" action="{!previous}" disabled="{!DisableNext}"   reRender="myPanel"/>
        <apex:commandButton value="Last Page" action="{!end}"  disabled="{!DisableNext}"  reRender="myPanel"/>
        <apex:commandButton id="redirectBack" value="Done" action="{!redirectBack}"/>
        <apex:commandLink action="{!getPageNumbers}" value="P1" rerender="pb"/> 
       
    </apex:pageBlockButtons>
    </apex:pageBlock>     

</apex:form>
</apex:page>

Output -