public class Opener {
    private Process pb;  // Process runner
    private String slash = "";
    private int useWindows, toggle = 0;

    public void setSlash() {
        if (System.getProperty("os.name").contains("Windows")) {
            slash = "\\";
            int dontUseWin = getWinSetting();
            if (dontUseWin == 1)
                useWindows = 0;
            else
                useWindows = 1;
        } else {
            slash = "/";
        }
    }

    public void setWinSetting() {
        if (toggle == 0)
            toggle = 1;
        else if (toggle == 1)
            toggle = 0;
    }
    public int getWinSetting() { return toggle; }

    public void fileOpener(String filePth) {
        if (filePth.toLowerCase().contains(".epub"))
            openEpub(filePth);
        else if (filePth.toLowerCase().contains(".pdf"))
            openPdf(filePth);
        else
            System.out.println("Something happened and the file culdn't be loaded.\n" +
                               "You either didn't select a file or the type isn't understood by this program.\n" +
                               "Or, something entirely unforseen happened....");
    }

    public void openEpub(String filePth) {
        setSlash();
        System.out.println("Opening EPUB : " + "'file:" + filePth + "'");

        if (useWindows == 0) {
            try {
                ProcessBuilder pb = new ProcessBuilder("java", "-jar", "resources" + slash + "jars" + slash +
                                                        "EpubViewer.jar", filePth);
                Process p = pb.start();
            } catch(Throwable cpErr) {
              System.out.println("Launch Error:\n" + cpErr);
        }
        } else { windows(filePth); }
    }

    public void openPdf(String filePth) {
        setSlash();
        System.out.println("Opening PDF : " + "'file:" + filePth + "'");
        if (useWindows == 0) {
            try {
                ProcessBuilder pb = new ProcessBuilder("java", "-jar", "resources" + slash + "jars" + slash +
                                                        "PdfViewer.jar", filePth );
                Process p = pb.start();
            } catch(Throwable cpErr) {
              System.out.println("Launch Error:\n" + cpErr);
            }
        } else { windows(filePth); }
    }

    public void windows(String filePth) {
        try {
            ProcessBuilder pb = new ProcessBuilder("resources/bin/SumatraPDF.exe", filePth);
            Process p = pb.start();
        } catch(Throwable cpErr) {
          System.out.println("Launch Error:\n" + cpErr);
        }
    }
}