/*
 * Block starter:
 * Import a PDF page containing Blocks and fill text and image
 * Blocks with some data. For each recipient of the simulated
 * mailing a separate page with personalized information is
 * generated.
 *
 * The Textflow Blocks are processed with variable text lengths in mind:
 * if a Block doesn't fully use its vertical space or requires excess
 * space, the next Block is moved up or down accordingly.
 *
 * Required software: PPS 9
 * Required data: Block PDF (template), images, font
 */

package com.pdflib.cookbook.pdflib.blocks;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class starter_block {
    public static void main(String argv[]) {

        // This is where the data files are. Adjust as necessary.
        String searchpath = "../input";
        String outfile = "starter_block.pdf";
        String infile = "block_template.pdf";

        pdflib p = null;
        int exitcode = 0;
        
        class Block {               // Description of a single text or image Block
            Block(String blockname, String contents[]) {
                this.name = blockname;
                this.contents = contents;
            }
            String name;            // Block name
            String contents[];      // text Block: array with a string for each recipient
                                    // image Block: array with image file name for each recipient
        };
        
        final int number_of_recipients = 3;

        // Names and contents of text Blocks
        Block TextBlocks[] = {
            new Block("recipient",
                new String[] {          // address data for each recipient
                    "Mr Maurizio Moroni\nStrada Provinciale 124\nReggio Emilia",

                    "Ms Dominique Perrier\n25, Rue Lauriston\nParis",

                    "Mr Liu Wong\n55 Grizzly Peak Rd.\nButte"
                }),

            new Block("announcement",
                new String[] {          // greeting for each recipient
                    "Dear Paper Planes Fan,\n\n" +
                    "we are happy to present our <fillcolor=red>best price offer" +
                    "<fillcolor=black> especially for you:\n",
                    
                    "Bonjour,\n\n" +
                    "here comes your personal <fillcolor=red>best price offer:\n",
                    
                    "Dear Paper Folder,\n\n" +
                    "here's another exciting new paper plane especially for you. " +
                    "We can supply this <fillcolor=red>best price offer" +
                    "<fillcolor=black> only for a limited time and in limited quantity. " +
                    "Don't hesitate and order your new plane today!\n",
                }),
            
            new Block("specialoffers",
                new String[] {          // personalized offer for each recipient
                    "<fillcolor=red>Long Distance Glider<fillcolor=black>\n" +
                    "With this paper rocket you can send all your " +
                    "messages even when sitting in a hall or in the cinema pretty near " +
                    "the back.\n",
                    
                    "<fillcolor=red>Giant Wing<fillcolor=black>\n" +
                    "An unbelievable sailplane! It is amazingly robust and " +
                    "can even do aerobatics. But it is best suited to gliding.\n" +
                    "This paper arrow can be thrown with big swing. " +
                    "We launched it from the roof of a hotel. It stayed in the air a " +
                    "long time and covered a considerable distance.\n",
                    
                    "<fillcolor=red>Super Dart<fillcolor=black>\n" +
                    "The super dart can fly giant loops with a radius of 4 " +
                    "or 5 meters and cover very long distances. Its heavy cone point is " +
                    "slightly bowed upwards to get the lift required for loops.\n"
                }),            

            new Block("goodbye",
                new String[] {          // bye bye phrase for each recipient
                    "Visit us on our Web site at <fillcolor=blue>www.kraxi.com<fillcolor=black>!\n\n" +
                    "Yours sincerely,\nVictor Kraxi",
                
                    "Make sure to order quickly at <fillcolor=blue>www.kraxi.com<fillcolor=black> " +
                    "since we will soon run out of stock!\n\n" +
                    "Yours sincerely,\nVictor Kraxi",

                    "Make sure to order soon at <fillcolor=blue>www.kraxi.com<fillcolor=black>!\n\n" +
                    "Your friendly staff at Kraxi Systems Paper Planes",
                })
            };

        // Names and contents of image Block(s)
        Block ImageBlocks[] = {
            new Block("icon",
                new String[] {          // image file name for each recipient
                    "plane1.png",
                    "plane2.png",
                    "plane3.png"
                })
        };
        
        try {
            p = new pdflib();
            int no_of_input_pages, indoc;

            // This means we must check return values of load_font() etc.
            // Set the search path for fonts and images etc.
            p.set_option("errorpolicy=return SearchPath={{" + searchpath + "}}");

            if (p.begin_document(outfile,
                "destination={type=fitwindow} pagelayout=singlepage") == -1) {
                throw new Exception("Error: " + p.get_errmsg());
            }

            p.set_info("Creator", "PDFlib starter sample");
            p.set_info("Title", "starter_block");

            // Open the Block template with PDFlib Blocks
            indoc = p.open_pdi_document(infile, "");
            if (indoc == -1) {
                throw new Exception("Error: " + p.get_errmsg());
            }
            no_of_input_pages = (int) p.pcos_get_number(indoc, "length:pages");

            // Preload all pages of the Block template. We assume a small
            // number of input pages and a large number of generated output
            // pages. Therefore it makes sense to keep the input pages
            // open instead of opening them again for each recipient.
            // Add 1 because we use the 1-based page number as array index.
            
            int[] pagehandles = new int[no_of_input_pages+1]; 

            for (int pageno = 1; pageno <= no_of_input_pages; pageno++){
                // Open template page and prepare it for cloning the page size
                pagehandles[pageno] = p.open_pdi_page(indoc, pageno, "cloneboxes");

                if (pagehandles[pageno] == -1) {
                    throw new Exception("Error: " + p.get_errmsg());
                }
            }

            // For each recipient: place template page(s) and fill Blocks
            for (int recipient = 0; recipient < number_of_recipients; recipient++) {

                // Process all pages of the template document
                for (int pageno = 1; pageno <= no_of_input_pages; pageno++) {
                    // Start the next output page. The page size will be
                    // replaced with the cloned size of the input page.
                    p.begin_page_ext(0, 0, "width=a4.width height=a4.height");

                    // Place the imported page on the output page, and clone all
                    // page boxes which are present in the input page; this will
                    // override the dummy size used in begin_page_ext().
                    p.fit_pdi_page(pagehandles[pageno], 0, 0, "cloneboxes");

                    // Accumulated unused or excess space in Textflow Blocks
                    double offset_y = 0;

                    // Process all Textflow Blocks
                    for (Block textblock: TextBlocks) {
                        Boolean textflow=false;

                        // The Textflow Blocks in the template use "fitmethod=nofit"
                        // which means we allow the Textflow to overflow the Block.
                        final String baseopt = "encoding=unicode embedding";
                        String optlist = baseopt;

                        // pCOS path for the current Block 
                        String blockpath = "pages[" + (pageno-1) + "]/blocks/" + textblock.name;
                        
                        // Check whether this is a Textflow Block (as opposed to Textline)
                        String objtype = p.pcos_get_string(indoc, "type:" + blockpath + "/textflow");
                        if (objtype.equals("boolean") &&
                            p.pcos_get_number(indoc, blockpath + "/textflow") != 0) {

                            // Supplying the "textflowoption" option to fill_textblock() makes
                            // this method return a valid Textflow handle for the Block
                            // contents. We use this handle later in info_textflow()
                            // to retrieve the end position of the text.
                            textflow = true;
                            optlist += " textflowhandle=-1";
                        }

                        // Retrieve coordinates of the Block's lower left corner
                        double llx = p.pcos_get_number(indoc, blockpath + "/Rect[0]");
                        double lly = p.pcos_get_number(indoc, blockpath + "/Rect[1]");

                        // Adjust the vertical Block position by offset_y
                        // and make sure we don't fall off the lower page edge.
                        // Similarly we could adjust the horizontal position.
                        lly += offset_y;
                        if (lly < 0) {
                            throw new Exception("Error for recipient " + recipient + " (input page " + pageno + "): " +
                                "Too much text in Textflow Blocks");
                        }

                        // The "refpoint" option overrides the Blocks's original
                        // position. This way we can move the Block up or down
                        // if the previous Blocks didn't use up their area or exceeded
                        // the Block area.
                        optlist += " refpoint {" + llx + " " + lly +"}";

                        // Fill the text Block.
                        // The return value is usually only an error indicator,
                        // but for Textflow Blocks with "textflowhandle" it
                        // returns a usable Textflow handle.
                        int tf = p.fill_textblock(pagehandles[pageno], textblock.name,
                            textblock.contents[recipient], optlist);
                        
                        if (tf == -1) {
                            System.err.println("Warning: " + p.get_errmsg());
                        }
                        else if (textflow) {
                            // We successfully filled a Textflow Block. Retrieve
                            // vertical end position and height of the text...
                            double textendy = p.info_textflow(tf, "textendy");
                            double textheight = p.info_textflow(tf, "textheight");
                            p.delete_textflow(tf);

                            // ...and accumulate the Block height which wasn't used
                            // or was used in excess of the Block height.
                            // This will be used for adjusting the next Block.
                            // Don't do this for empty Textflows since info_textflow()
                            // reports textendy=0 for those.
                            if (textheight > 0)
                                offset_y += (textendy - lly );
                        }
                    }

                    // Process all image Blocks
                    for (Block imageblock: ImageBlocks) {
                        int image = p.load_image("auto", imageblock.contents[recipient], "");
                        if (image == -1) {
                            throw new Exception("Error: " + p.get_errmsg());
                        }
    
                        // Fill image Block
                        if (p.fill_imageblock(pagehandles[pageno], imageblock.name, image, "") == -1)
                            System.err.println("Warning: " + p.get_errmsg());
                        p.close_image(image);
                    }

                    p.end_page_ext("");
                }
            }

            // Close the preloaded template pages
            for (int pageno = 1; pageno <= no_of_input_pages; pageno++) {
                p.close_pdi_page(pagehandles[pageno]);
            }
            p.close_pdi_document(indoc);

            p.end_document("");        
        }
        catch (PDFlibException e) {
            System.err.println("PDFlib exception occurred:");
            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname() +
                ": " + e.get_errmsg());
            exitcode = 1;
        }
        catch (Exception e) {
            System.err.println(e);
            exitcode = 1;
        }
        finally {
            if (p != null) {
                p.delete();
            }
            System.exit(exitcode);
        }
    }
}