<apex:page controller="AccController" showHeader="true" tabStyle="account" >
    <apex:form > 
        <apex:pageMessages ></apex:pageMessages>
        <apex:pageblock title="New Account" id="CreateRecordBlock" Rendered="{!ShowCreateBlock}">
            <apex:pageblockSection >
                <apex:inputField value="{!NewAccountRecord.Name}"/>
                <apex:inputField value="{!NewAccountRecord.Phone}"/>  
                <apex:inputField value="{!NewAccountRecord.Email__c}"/>  
            </apex:pageblockSection>
            <apex:pageblockButtons >
                <apex:commandButton value="saveAccount" action="{!saveRecord}"/>
            </apex:pageblockButtons>
        </apex:pageblock>
        
        <apex:pageBlock id="SearchBlock" Rendered="{!ShowBlock}">
            <apex:inputText value="{!searchstring}" label="Input"/> 
            <apex:commandButton value="Search records" action="{!search}" /> 
            <apex:commandButton value="Clear records" action="{!clear}"/> 
            <!-- <apex:commandButton value="Create account" action="{!create}"/>-->
            <apex:pageBlock title="Search Result" id="resBlock" rendered="{!DisplaySearchResults}">
                <apex:actionSupport event="onchange" reRender="Account"/> 
                <apex:pageblockTable value="{!acc}" var="a"> 
                    <apex:column value="{!a.name}"/> 
                    <apex:column value="{!a.id}"/>
                </apex:pageblockTable>
            </apex:pageBlock>
            
            
            <apex:pageBlock id="pb">
                <apex:inputField value="{!Account.Type}"/>
                <apex:pageBlockTable value="{!showList}" var="a" id="pt">
                    <apex:column headerValue="Account Name">
                        <apex:outputLink value="/{!a.id}">{!a.name}</apex:outputLink>
                    </apex:column>
                    <apex:column headerValue="Account Phone" value="{!a.Phone}"/>
                    <apex:column headerValue="Account Email" value="{!a.Email__c}"/>
                    
                    <apex:CommandButton action="{!executeSearch}" value="Search"/>
                    
                    <apex:selectList >
                        <apex:selectOptions value="{!options}"/>
                    </apex:selectList>
                </apex:pageBlockTable>
                
                
                <apex:commandButton value="First" action="{!ssc.first}" disabled="{!!ssc.hasPrevious}" reRender="pt,pb" />
                <apex:commandButton value="Previous" action="{!ssc.previous}" disabled="{!!ssc.hasPrevious}" reRender="pt,pb" />
                <apex:commandButton value="Next" action="{!ssc.next}" disabled="{!!ssc.hasNext}" reRender="pt,pb" />
                <apex:commandButton value="End" action="{!ssc.last}" disabled="{!!ssc.hasNext}" reRender="pt,pb" />
            </apex:pageBlock>
        </apex:pageBlock>
    </apex:form>
</apex:page>

public class AccController {
    
    public list <account> acc {get;set;} 
    public string searchstring {get;set;} 
    Public Boolean ShowCreateBlock{get;set;}
    public Boolean ShowBlock{get;set;}
    Public Boolean DisplaySearchResults{get;set;}
    public Account account{get;set;}
    Public Account NewAccountRecord{get;set;}
    
    Public Integer noOfRecords {get;set;}
    Public Integer size {get;set;}
    
    public AccController() {
        ShowCreateBlock = false;
        ShowBlock=True;
        DisplaySearchResults = false;
        NewAccountRecord= New Account(Name='Test');  
        size = 10;
    }
    
    public ApexPages.StandardSetController ssc{
        get{
            if(ssc == null){
                String queryResult = 'SELECT Id, Name, Phone, Email__c FROM Account';
                ssc = new ApexPages.StandardSetController(Database.getQueryLocator(queryResult));
                ssc.setPageSize(size);
                noOfRecords = ssc.getResultSize();
            }
            return ssc;
        }
        set;
    }
    
    public String getAccount() {
        return null;
    }
    
    
    public String options { get; set; }
    
    public PageReference executeSearch() {
        return null;
    }
    
    //public list<account> showList = new list<account>([select Name, Email__c,Phone from Account]);
    
    Public list<account> getshowList() {
        return (List<Account>)ssc.getRecords();
    }
    
    public PageReference create() {
        return null;
    }
    
    public pagereference search() { 
        string searchquery='select name,id from account where name like \'%'+searchstring+'%\' Limit 20'; 
        acc= Database.query(searchquery);
        DisplaySearchResults =true;
        if(acc.size()==0) {
            ApexPages.addmessage(new ApexPages.message(ApexPages.severity.ERROR,'account not found'));
            ShowCreateBlock = true; 
            ShowBlock=False;
        }
        return null;
    }
    
    public void clear() { 
        acc.clear(); 
    } 
    
    Public pagereference saveRecord() {
        acc=[select id,email__c from Account];
        for(Account a : acc) {
            if(NewAccountRecord.Email__c==a.Email__C) {
                ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Email is already exist'));
                return null;
            }
        }
        if(ApexPages.hasMessages()==false) {
            insert NewAccountRecord;
            pagereference  pageRef = new pagereference('/'+NewAccountRecord.Id);
            return pageRef ; 
        } 
        return null; 
    }
    
    public List<SelectOption> getItems() {
        List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('10','10'));
        options.add(new SelectOption('20','20'));
        options.add(new SelectOption('30','30'));
        options.add(new SelectOption('40','40'));
        return options;
    }
}