package com.pdflib.cookbook.pcos.pages;

import com.pdflib.pCOS;
import com.pdflib.pCOSException;
import com.pdflib.cookbook.pcos.pcos_cookbook_example;

/**
 * Print information about all images in the document.
 * <p>
 * Required software: pCOS interface 3 (pCOS 2.x, PDFlib 7.x, TET 2.2,
 * PLOP 3.x)<br>
 * Required data: PDF document
 * 
 * @version $Id: page_images.java,v 1.2 2007/09/19 08:45:30 stm Exp $
 */
public class page_images extends pcos_cookbook_example {
    
    /* This is where the data files are. Adjust as necessary. */
    private final static String SEARCH_PATH = "../input";

    public void example_code(pCOS p, String filename) throws pCOSException, Exception {
        /* Open the PDF document */
        int doc = p.open_document(filename, "");
        if (doc == -1)
            throw new Exception("Error: " + p.get_errmsg());
        
        System.out.println("File name: " + p.get_string(doc, "filename"));
        
        int imagecount = 0;
        int pagecount = (int) p.get_number(doc, "length:pages");
                
        for (int page = 0; page < pagecount; page += 1) {
            imagecount += print_page_image_info(p, doc, page);
        }

        System.out.println("Image count: " + imagecount);
   
        p.close_document(doc);
    }
    
    private int print_page_image_info(pCOS p, int doc, int page)
        throws pCOSException {
        int images_on_page = (int) p.get_number(doc,
                    "length:pages[" + page + "]/images");
        if (images_on_page > 0) {
            System.out.println("Page " + (page + 1));
            for (int image = 0; image < images_on_page; image += 1) {
                System.out.print("  Image " + (image + 1) + ", ");

                String objtype = p.get_string(doc,
                    "type:pages[" + page + "]/images[" + image + "]/Filter");

                if (objtype.equals("name")) {
                    String filter = p.get_string(doc,
                        "pages[" + page + "]/images[" + image + "]/Filter");
                    System.out.print("Filter=" + filter);
                }
                else if (objtype.equals("array")) {
                    String filter = p.get_string(doc,
                        "pages[" + page + "]/images[" + image + "]/Filter[0]");
                    System.out.print("Filter=" + filter);

                    int filtercount = (int) p.get_number(doc,
                        "length:pages[" + page + "]/images[" + image + "]/Filter");

                    for (int f = 1; f < filtercount; f++) {
                        filter = p.get_string(doc,
                            "pages[" + page + "]/images[" + image + "]/Filter[" + f + "]");
                        System.out.print("+" + filter);
                    }
                }

                System.out.print(", "
                    + (int) p.get_number(doc, "pages[" + page + "]/images[" + image + "]/Width")
                    + "x"
                    + (int) p.get_number(doc, "pages[" + page + "]/images[" + image + "]/Height")
                    + ", ");

                check_colorspace(p, doc, page, image);
                
                System.out.println();
            }
        }
        return images_on_page;
    }
            
    private static void check_colorspace(pCOS p, int doc, int page, int image)
        throws pCOSException {
        String objtype = p.get_string(doc, "type:pages[" + page + "]/images[" + image + "]/ColorSpace");

        if (objtype.equals("name")) {
            System.out.print(p.get_string(doc, "pages[" + page + "]/images[" + image + "]/ColorSpace"));
        }
        else if (objtype.equals("array")) {
            String cs = p.get_string(doc, "pages[" + page + "]/images[" + image + "]/ColorSpace[0]");
            System.out.print(cs);

            if (cs.equals("Indexed") || cs.equals("Separation")) {
                System.out.print(" "
                    + p.get_string(doc, "pages[" + page + "]/images[" + image + "]/ColorSpace[1]"));
            }
        }
        else if (objtype.equals("null")) {
            System.out.print("ImageMask");
        }
        else {
            System.out.print("(complex ColorSpace)");
        }
    }
    
    public page_images(String[] argv, String readable_name,
        String search_path, String full_rcs_file_name, String revision) {
        super(argv, readable_name, search_path, full_rcs_file_name, revision);
    }

    public static void main(String argv[]) {
        page_images example = new page_images(argv,
            "Image XObjects", SEARCH_PATH,
            "$RCSfile: page_images.java,v $", "$Revision: 1.2 $");
        example.execute();
    }
}