public class Program {
    
    public static void fetchDataAndCreatePDF()
    {
        String API_KEY = '*****************************************';       

        // You can also upload your own file into PDF.co and use it as url. Check "Upload File" samples for code snippets: https://github.com/bytescout/pdf-co-api-samples/tree/master/File%20Upload/    
        string SourceFileUrl = 'https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-edit/sample.pdf';

        string Pages = '';
        string Password = '';
        String DestinationFile = 'result';
        string Type = 'annotation';
        Integer X = 400;
        Integer Y = 600;
        string Text = 'APPROVED';
        string FontName = 'Times New Roman';
        Decimal FontSize = 24;
        string FontColor = 'FF0000';
        Map<string, Object> parameters = new Map<string, Object>();
        parameters.put('name', DestinationFile);
        parameters.put('password', Password);
        parameters.put('pages', Pages);
        parameters.put('url', SourceFileUrl);
        parameters.put('type', Type);
        parameters.put('x', X);
        parameters.put('y', Y);
        parameters.put('text', Text);
        parameters.put('fontname', FontName);
        parameters.put('size', FontSize);
        parameters.put('color', FontColor);
        
        string jsonPayload = Json.serialize(parameters);
        try
        {
            string url = 'https://api.pdf.co/v1/pdf/edit/add';
            HttpRequest req = new HttpRequest();
            req.setBody(jsonPayload);
            req.setHeader('x-api-key', API_KEY);
            req.setHeader('Content-Type', 'application/json');
            req.setEndpoint(url);
            req.setMethod('POST');
            req.setTimeout(60000);
            Http http = new Http();
            HTTPResponse res = http.send(req);
            if(res.getStatusCode() == 200) 
            {
                System.Debug('res ' + res);
                Map<String, Object> deserializedBody =  (Map<String, Object>)JSON.deserializeUntyped(res.getBody());
                String urlVal = (String)deserializedBody.get('url');
                downloadPDFAndStore(urlVal, DestinationFile);
            }
            else
            {
                System.debug('Success Response ' + res.getBody());
                System.Debug(' Status ' + res.getStatus());
                System.Debug(' Status Code' + res.getStatusCode());
                System.Debug(' Status String' + res.toString());
            }
           
        }
        catch(Exception ex)
        {
            String errorBody = 'Message: ' + ex.getMessage() + ' -- Cause: ' + ex.getCause() + ' -- Stacktrace: ' + ex.getStackTraceString();
            System.Debug(errorBody);
        }
    }

    @TestVisible
    private static void downloadPDFAndStore(String extFileUrl, String DestinationFile)
    {
        try
        {
            Http h = new Http(); 
            HttpRequest req = new HttpRequest(); 
            extFileUrl = extFileUrl.replace(' ', '%20'); 
            req.setEndpoint(extFileUrl); 
            req.setMethod('GET'); 
            req.setHeader('Content-Type', 'application/pdf'); 
            req.setCompressed(true); 
            req.setTimeout(60000); 
            //Now Send HTTP Request
            HttpResponse res  = h.send(req); 
            if(res.getStatusCode() == 200) 
            {
                blob fileContent = res.getBodyAsBlob();
                ContentVersion conVer = new ContentVersion();
                conVer.ContentLocation = 'S'; // to use S specify this document is in Salesforce, to use E for external files
                conVer.PathOnClient = DestinationFile + '.pdf'; // The files name, extension is very important here which will help the file in preview.
                conVer.Title = DestinationFile; // Display name of the files
                conVer.VersionData = fileContent;
                insert conVer;
                System.Debug('Success');
            }
            else
            {
                System.debug('Success Response ' + res.getBody());
                System.Debug(' Status ' + res.getStatus());
                System.Debug(' Status Code' + res.getStatusCode());
                System.Debug(' Status String' + res.toString());
            }
        }
        catch(Exception ex)
        {
            String errorBody = 'Message: ' + ex.getMessage() + ' -- Cause: ' + ex.getCause() + ' -- Stacktrace: ' + ex.getStackTraceString();
            System.Debug(errorBody);
        }
    }
}

@isTest
public class ProgramTest
{
    private  testmethod static void testFetchDataAndCreatePDF()
    {
        Test.setMock(HttpCalloutMock.class, new ProgramTest.DocumentCreationMock());
        Program.fetchDataAndCreatePDF();
        List<ContentVersion> cv = [select Id from ContentVersion];
        System.assertEquals(1, cv.size());
    }

    private  testmethod static void testFetchDataAndCreatePDFException()
    {
        Program.fetchDataAndCreatePDF();
        List<ContentVersion> cv = [select Id from ContentVersion];
        System.assertEquals(0, cv.size());
    }
    
    private  testmethod static void testdownloadPDFAndStoreException()
    {
        Program.downloadPDFAndStore(null, null);
        List<ContentVersion> cv = [select Id from ContentVersion];
        System.assertEquals(0, cv.size());
    }

    public class DocumentCreationMock implements HttpCalloutMock {
        public HTTPResponse respond(HTTPRequest req) {
            HttpResponse res = new HttpResponse();
            String testBody = '{"hash":"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855","url":"https://pdf-temp-files.s3-us-west-2.amazonaws.com/0c336bfcef1a473d98492bda25d8da03/newDocument.pdf?X-Amz-Expires=3600&x-amz-security-token=FwoGZXIvYXdzEO7%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaDHWK1dY4d4lOgsheliKBATwE%2FZewASPTEnPxTn%2BOdYhP4h3gljAJfqbRvQptDX7wdWLmrBS7Tg4qTU6pAbxIdXChGPjBWpSbtiADJKmqkmyhkUmE8GSM1%2FGtJO6bga2pgzvFLXmzxjTf3%2BFNqwYOvbyApIZdVLoPpEKY6PlCflQtLTd30dhelm6xpB8pitbdhSjdz8KCBjIobVy%2Fjwybwp6OQgB%2FT6QkIo2dU07gtFREdn5jhRyvnS5lkccweBV1%2Bw%3D%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIA4NRRSZPHMV5P3JOS/20210316/us-west-2/s3/aws4_request&X-Amz-Date=20210316T124309Z&X-Amz-SignedHeaders=host;x-amz-security-token&X-Amz-Signature=95287bf3c007fed4c2c5aeea1ce75c846cc6c68b22aaf35175ebe41a105f54e1","pageCount":1,"error":false,"status":200,"name":"newDocument","remainingCredits":9913694,"credits":3}';
            res.setHeader('Content-Type', 'application/json');
            res.setBody(testBody);
            res.setStatusCode(200);
            return res;
        }
    }
}