//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2012 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

#import <OBJC/PDFNetOBJC.h>
#import <Foundation/Foundation.h>

//-----------------------------------------------------------------------------------
// The sample illustrates how multiple pages can be combined/imposed 
// using PDFNet. Page imposition can be used to arrange/order pages 
// prior to printing or to assemble a 'master' page from several 'source' 
// pages. Using PDFNet API it is possible to write applications that can 
// re-order the pages such that they will display in the correct order 
// when the hard copy pages are compiled and folded correctly. 
//-----------------------------------------------------------------------------------

int main(int argc, char *argv[])
{
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	
	int ret = 0;
	[PDFNet Initialize: 0];

	// Relative path to the folder containing test files.
	NSString *input_path = @"../../TestFiles/newsletter.pdf";
	NSString *output_path = @"../../TestFiles/Output/newsletter_booklet.pdf";

	@try
	{	 
		NSLog(@"-------------------------------------------------");
		NSLog(@"Opening the input pdf...");

		NSString *filein = input_path;
		NSString *fileout = output_path;

		PDFDoc *in_doc = [[[PDFDoc alloc] initWithFilepath: filein] autorelease];
		[in_doc InitSecurityHandler];

		// Create a list of pages to import from one PDF document to another.
		VectorPage *import_pages = [[[VectorPage alloc] init] autorelease]; 
        PageIterator *itr;
		for (itr=[in_doc GetPageIterator: 1]; [itr HasNext]; [itr Next]) {
			[import_pages add: [itr Current]];
		}

		PDFDoc *new_doc = [[[PDFDoc alloc] init] autorelease];
		VectorPage *imported_pages = [new_doc ImportPages: import_pages import_bookmarks: NO];

		// Paper dimension for A3 format in points. Because one inch has 
		// 72 points, 11.69 inch 72 = 841.69 points
		PDFRect *media_box = [[[PDFRect alloc] initWithX1: 0 y1: 0 x2: 1190.88 y2: 841.69] autorelease]; 
		double mid_point = [media_box Width]/2;

		ElementBuilder *builder = [[[ElementBuilder alloc] init] autorelease];
		ElementWriter  *writer = [[[ElementWriter alloc] init] autorelease];
	
        size_t i;
		for (i=0; i<[imported_pages size]; ++i)
		{
			// Create a blank new A3 page and place on it two pages from the input document.
			Page *new_page = [new_doc PageCreate: media_box];
			[writer WriterBeginWithPage: new_page placement: e_overlay page_coord_sys: YES compress: YES];

			// Place the first page
			Page *src_page = [imported_pages get: i];
			Element *element = [builder CreateFormWithPage: src_page];

			double sc_x = mid_point / [src_page GetPageWidth: e_crop];
			double sc_y = [media_box Height] / [src_page GetPageHeight: e_crop];
			double scale = sc_x < sc_y ? sc_x : sc_y; // min(sc_x, sc_y)
			[[element GetGState] SetTransform: scale b: 0 c: 0 d: scale h: 0 v: 0];
			[writer WritePlacedElement: element];
			
			// Place the second page
			++i; 
			if (i<[imported_pages size])	{
				src_page = [imported_pages get: i];
				element = [builder CreateFormWithPage: src_page];
				sc_x = mid_point / [src_page GetPageWidth: e_crop];
				sc_y = [media_box Height] / [src_page GetPageHeight: e_crop];
				scale = sc_x < sc_y ? sc_x : sc_y; // min(sc_x, sc_y)
				[[element GetGState] SetTransform: scale b: 0 c: 0 d: scale h: mid_point v: 0];
				[writer WritePlacedElement: element];
			}

			[writer End];
			[new_doc PagePushBack: new_page];
		}		

		[new_doc SaveToFile: fileout flags: e_linearized];
		NSLog(@"Done. Result saved in newsletter_booklet.pdf...");
	}
	@catch(NSException *e)
	{
		NSLog(@"%@", [e reason]);
		ret = 1;
	}
	
	NSLog(@"Done.");
	[pool release];
	return ret;
}