package jalview.gui;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

import javax.swing.JOptionPane;

public class UserQuestionnaireCheck implements Runnable {
    /**
     * Implements the client side machinery for detecting a new questionnaire, 
     * checking if the user has responded to an existing one, 
     * and prompting the user for responding to a questionnaire.
     * This is intended to work with the perl CGI scripts checkresponder.pl and
     * questionnaire.pl
     */
    String url=null;
    UserQuestionnaireCheck(String url) {
        if (url.indexOf("questionnaire.pl")==-1) {
            jalview.bin.Cache.log.error("'"+url+"' is an Invalid URL for the checkForQuestionnaire() method.\n"
                    +"This argument is only for questionnaires derived from jalview's questionnaire.pl cgi interface.");
        } else {
            this.url = url;
        }
    }
    String qid=null,rid=null;
    private boolean checkresponse(URL qurl) throws Exception {
        boolean prompt=false;
        // see if we have already responsed to this questionnaire or get a new qid/rid pair
        BufferedReader br = new BufferedReader(new InputStreamReader(qurl.openStream()));
        String qresp;
        while ((qresp=br.readLine())!=null) {
            if (qresp.indexOf("NOTYET:")==0) {
                prompt=true; // not yet responded under that ID
            } else {
                if (qresp.indexOf("RESPONDED:")==-1) {
                    // may be a qid:rid for the latest questionnaire.
                    // check if response is of form we expect.
                    if (qresp.indexOf(':')>-1) {
                        rid=null;
                        qid=qresp.substring(0,qresp.indexOf(':'));
                        if (qresp.indexOf(':')<(qresp.length()-1)) {
                            rid = qresp.substring(qresp.indexOf(':')+1);
                            prompt=true; // this is a new qid/rid pair
                        }
                    }
                } else {
                    prompt=false;
                }
            }
        }
        return prompt;
    }
    public void run() {
        if (url==null)
            return;
        boolean prompt=false;
        try {
            // First - check to see if wee have an old questionnaire/response id pair.
            String lastq=jalview.bin.Cache.getProperty("QUESTIONNAIRE");
            if (lastq==null) {
                prompt = checkresponse(new URL(url+(url.indexOf('?')>-1 ? "&" : "?") +"checkresponse=1"));
            } else {
                String qurl=url+(url.indexOf('?')>-1 ? "&" : "?") +"checkresponse=1";
                // query the server with the old qid/id pair
                String qqid = lastq.indexOf(':')>-1 ? lastq.substring(0,lastq.indexOf(':')) : null;
                if (qqid!=null && qqid.length()>0) {
                    qurl+="&qid="+qqid;
                    qid=qqid;
                }
                String qrid = lastq.substring(lastq.indexOf(':')+1); // retrieve old rid
                if (qrid!=null && !qrid.equals("null")) {
                    rid=qrid;
                    qurl+="&rid="+qrid;
                }
                // see if we have already responsed to this questionnaire.
                prompt = checkresponse(new URL(qurl));
            }
            // Update our local property cache with latest qid and rid
            jalview.bin.Cache.setProperty("QUESTIONNAIRE",qid+":"+rid);
            if (prompt) {
                String qurl = url+(url.indexOf('?')>-1 ? "&" : "?") + "qid="+qid+"&rid="+rid;
                jalview.bin.Cache.log.info("Prompting user for questionnaire at "+qurl);
                int reply = JOptionPane.showInternalConfirmDialog(Desktop.desktop,
                        "There is a new Questionnaire available." +
                        "Would you like to complete it now ?\n",
                        "Jalview User Survey",
                        JOptionPane.YES_NO_OPTION,
                        JOptionPane.QUESTION_MESSAGE);

                if (reply == JOptionPane.YES_OPTION)
                {
                    jalview.bin.Cache.log.debug("Opening "+qurl);
                    jalview.util.BrowserLauncher.openURL(qurl);
                }
            }
        } catch (Exception e) {
            jalview.bin.Cache.log.warn("When trying to access questionnaire URL "+url,e);
        }
    }

}