/**
* @author       Allen Watson
* @version  1.0
* @since        1.0
*
* Used to handle communication with slybroadcast Servers
*/
public with sharing class callout {

public String Username;
public String Password;

public callout(){
    Username = '{!$Credential.UserName}';
    Password = '{!$Credential.Password}';
}


/**
 * Sends a voice message request to slybroadcast
 *
 * @param   phone - The phone number that is to receive the voice message.
 * @param   audioRecord - The voice message that is to be sent.
 * @param   cdate - The date and time the voice message should be sent.
 * @param   callerID - The phone number that you want to send the voice message from.
 * @param   mobileOnly - Do you want to send the voice message to mobile phones only?
 * @return  Boolean - return value relays success or failure to the parent.
 * @since   1.0
 */
public Boolean sendRequest(String phone, String audioRecord, String cdate, String callerID, String mobileOnly)
{
    // remove username and password as it is handled by named credential
    HttpRequest req = new HttpRequest();
    HttpResponse res = new HttpResponse();
    Http http = new Http();
    req.setMethod('POST'); // Method Type
    req.setEndpoint('callout:SlyUserCred/vmb.php'); // Server Url
    req.setBody('c_uid='+Username+
                '&c_password='+Password+ '&c_phone=' + EncodingUtil.urlEncode(phone, 'UTF-8') +
                '&c_record_audio=' + EncodingUtil.urlEncode(audioRecord, 'UTF-8') + '&c_callerID=' +
                EncodingUtil.urlEncode(callerID,'UTF-8') + '&c_date=' + EncodingUtil.urlEncode(cdate, 'UTF-8') +
                '&c_audio='+ EncodingUtil.urlEncode('wav', 'UTF-8') + '&mobile_only=' + EncodingUtil.urlEncode(mobileOnly, 'UTF-8')); // Request Parameters
    try
    {
        //processing the response from slybroadcast.
        res = http.send(req);
        system.debug(res.getBody());
        if(res.getBody() != null)
        {
            system.debug(res.getBody());
            return true;
        }
        return true;

    }
    catch(Exception e)
    {
        System.debug('error: '+ e);
        return false;
    }
}

/**
 * Use to ask the slybroadcast severs for a list of stored audio file names.
 *
 * @return  List<String> - returns a list of all the audiofile accociated with a slybroadcast account.
 * @since   1.0
 */
public List<String> getAudioFiles()
{
    // remove username and password as it is handled by named credential
    List<String> rtnString = new List<String>();

    //Creates HttpRequest and builds the request.
    HttpRequest req = new HttpRequest();
    HttpResponse res = new HttpResponse();
    Http http = new Http();
    req.setMethod('POST'); // Method Type
    req.setEndpoint('callout:SlyUserCred/vmb.aflist.php'); // Server Url
    req.setBody('c_uid='+Username+
                '&c_password='+Password+
               '&c_method=' + EncodingUtil.urlEncode('get_audio_list', 'UTF-8'));

    try
    {
        //Processing the response from slybroadcast
        res = http.send(req);
        system.debug(res.getBody());
        if(res.getBody() != null)
        {
            //Splitting up the audioRecords into a list
            String unsplitString = res.getBody();
            List<String> firstSplitString = unsplitString.split('n');
            List<String> secondSplitString = new List<String>();
            for(String s : firstSplitString)
            {
                secondSplitString = s.split('\|');
                String temp = secondSplitString[1];
                secondSplitString[1] = temp.remove('"');
                rtnString.add(secondSplitString[1]);
            }
            return rtnString;
        }
        return rtnString;
    }
    catch(Exception e)
    {
        rtnString.add('error: '+ e);
        return rtnString;
    }
}
//used to verify that the slybroadcast account that the user entered is a valid one.
public Boolean validateAccount()
{
    // remove username and password as it is handled by named credential
    Boolean isValid = false;
    HttpRequest req = new HttpRequest();
    HttpResponse res = new HttpResponse();
    Http http = new Http();
    req.setMethod('POST'); // Method Type
    req.setEndpoint('callout:SlyUserCred/vmb.php'); // Server Url
    req.setBody('c_uid='+Username+
                '&c_password='+Password+
                '&c_option=user_verify'); // Request Parameters
    system.debug('CAL116: '+req.getBody());
    try
    {
        res = http.send(req);
        system.debug('Res: '+res.getBody());
        if(res.getBody() == 'OK')
        {
            isValid = true;
        }else
        {
            //throw new CalloutException(res.getBody());
        }

    }
    catch(Exception e)
    {
        throw e;
    }
    return isValid;
}
}

public with sharing class WelcomeController {
public callout Broadcaster;

public WelcomeController(){
    Broadcaster = new callout();
    //System.debug('Got Here');
}

public PageReference ValidateSlybroadcastAccount(){
    PageReference ValidationResult = Page.SlybroadcastAcctValidVFP;
    Boolean isValid = Broadcaster.validateAccount();
    if(!isValid) ValidationResult = Page.SlybroadcastAcctInvalidVFP;
    System.debug('Is Slybroadcast Account Valid: '+isValid);
    return ValidationResult;
}

public PageReference ReturnToWelcome(){
    return Page.SlybroadcastWelcomeVFP;
}
}

<apex:page controller="WelcomeController">
<apex:pageBlock title="Welcome to Slybroadcast." tabStyle="Message__c">
    <apex:form >
        <apex:pageBlockSection title="Account Validation" collapsible="true">
            <apex:commandLink action="/0XU/e?retURL=%2Fudd%2FExternalDataUserAuth%2FlistExternalDataUserAuth.apexp" value="Add Slybroadcast Credentials to Salesforce."/>
            <apex:commandLink action="{!ValidateSlybroadcastAccount}" value="Validate Slybroadcast Credentials."/>
        </apex:pageBlockSection>
        <apex:pageBlockSection title="More" collapsible="true">
            <apex:commandLink action="https://drive.google.com/drive/folders/11X2d6Ml1249BVFMkPfaPd9VlHs4CgZfG?usp=sharing" value="Visual Aids and more instructions."/>
        </apex:pageBlockSection>
    </apex:form>
</apex:pageBlock>