@RestResource(urlMapping='/referrallead/*')
global with sharing class ReferalProgram {
   
    @HttpGet
    global static lead getLeadById() {
        //  global static opportunity getOpportunityById() {
        RestRequest request = RestContext.request;
        String leadId = request.requestURI.substring(request.requestURI.lastIndexOf('/')+1);
        
        lead result =  [SELECT lastname,firstname,email,Phone,status FROM lead WHERE Id = :leadId]; 
        return result;
    }
    
    @HttpPost
    global static ID createlead(String firstname, String lastname,String email, String phone, String company, String leadsource, String origin, String reffname, String reflname,String rectype) {
        
        lead thislead = new lead();
        List<Lead> leadlist = [select id,lastname,email from lead where email =: email];
        contact thiscontact = new contact();
        List<Contact> conList = [select id,name,email from Contact where email =: email];
        if(leadlist.size() >0 || conList.size() >0){
            thislead.Email.addError('Email already exists');
        }
        else
        thislead.Lastname = lastname;
        thislead.Firstname = firstname;
        thislead.Email = email;
        thislead.Company = company;
        thislead.phone = phone;
        thislead.leadsource = leadsource;
        thislead.origin__c = origin;
        thislead.Referrer_First_Name__c = reffname;
        thislead.Referrer_Last_Name__c = reflname;
        thislead.RecordTypeId = '012D00000007Q8D';
        insert thislead;
        return thislead.Id;
    }

    @HttpPatch
    global static ID updateleadFields() {
        RestRequest request = RestContext.request;
        String leadId = request.requestURI.substring(
            request.requestURI.lastIndexOf('/')+1);
        lead thislead = [SELECT Id FROM lead WHERE Id = :leadId];
        // Deserialize the JSON string into name-value pairs
        Map<String, Object> params = (Map<String, Object>)JSON.deserializeUntyped(request.requestbody.tostring());
        // Iterate through each parameter field and value
        for(String fieldName : params.keySet()) {
            // Set the field and value on the Lead sObject
            thislead.put(fieldName, params.get(fieldName));
        }
        update thislead;
        return thislead.Id;
    }    
}