var fs           = require('fs'),
	PDFDocument  = require('pdfkit'),
	async        = require('async'),
	ColorThief   = require('color-thief'),
    colorThief   = new ColorThief();


var bookWidth = 430;
var bookHeight = 343;


var doc = new PDFDocument({ size: [bookWidth, bookHeight], margins: [0,0,0,0] });

doc.pipe(fs.createWriteStream('output.pdf'));

var pageNumber = 1;
var totalPages = 0;


// Request json from cooper-hewitt api to ./json

// Download images to ./images

// Download the Cooper Hewitt font from
// http://www.cooperhewitt.org/open-source-at-cooper-hewitt/cooper-hewitt-the-typeface-by-chester-jenkins/
// http://chfonts.s3.amazonaws.com/CooHew-TTF-v1p1-public.zip


// Count the total number of pages
for (i = 1; i <= 9; i++) { 
    var myData = require('./json/'+i+'.json');
    for (j = 0; j < myData.objects.length; j++) { 
        if (typeof myData.objects[j].images !== 'undefined') { 
            if (typeof myData.objects[j].images[0] !== 'undefined') { 
                totalPages = totalPages + 1;
            }
        }
    }
}

// format total for cover page
var totalPagesComma = totalPages.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");



// Make cover page
doc.lineWidth(25);
doc.rect(0,0,bookWidth,bookHeight).fillAndStroke("black", "white").stroke();
doc.fillColor('white').font('./font/CooHew-Bold.ttf').fontSize(52).text('MATCHSAFE', 30, 30, { width: bookWidth, align: 'left' });
doc.fillColor('white').font('./font/CooHew-Bold.ttf').fontSize(18).text(totalPagesComma + ' OBJECTS FROM THE', 30, 100, { width: bookWidth, align: 'left' });
doc.fillColor('white').font('./font/CooHew-Bold.ttf').fontSize(18).text('COOPER-HEWITT COLLECTION', 30, 121, { width: bookWidth, align: 'left' });


// Make colophon
doc.addPage();
doc.lineWidth(25);
doc.rect(0,0,bookWidth,bookHeight).fillAndStroke("#eeeeee", "white").stroke();
doc.fillColor('black').font('./font/CooHew-Roman.ttf').fontSize(10).text('Compiled by John Emerson\nhttp://backspace.com\n\nfrom The Cooper-Hewitt API\nhttps://collection.cooperhewitt.org/api\n\nInspired by Irma Boom\nhttps://youtu.be/oHcEKNoDajk\n\nBook source code at\nhttps://gist.github.com/bcks/dd609677c6a6ffc426e9', 30, bookHeight / 2, { width: bookWidth, align: 'left' });


// Make object pages
for (var i = 1; i <= 9; i++) { 
    var myData = require('./json/'+i+'.json');

    async.forEach(myData.objects, function(object, callback) {

        if (typeof object.images !== 'undefined') { 
            if (typeof object.images[0] !== 'undefined') { 

                    var parts = object.images[0].b.url.split('/');
                    var popped = parts.pop();

                    console.log(pageNumber + ' ' + popped);

                    var imagePath = 'images/' + popped;
                    var img_width = object.images[0].b.width;
                    var img_height = object.images[0].b.height;
                    var xpad = 0;
                    var ypad = 0;
                    
                    var dimension;
                    var hex = '#000000';


					// some images get padding, but if they are close to the page ratio, just fit to page and crop a little

                    var ratioDifference = (bookWidth / bookHeight) - (img_width / img_height);

                    if (ratioDifference < .3 && ratioDifference > -.3) {
                        if ( ( bookWidth / bookHeight ) >= ( img_width / img_height ) ) {
                            xpad = 0;
                            ypad = ( bookHeight / 2 ) - ( img_height * ( bookWidth / img_width )  / 2 );
                            dimension = { width: bookWidth };
                        } else {
                            var new_width =   img_width / img_height * bookHeight;
                            xpad = ( bookWidth / 2 ) - ( img_width * ( bookHeight / img_height )  / 2 );
                            ypad = 0;
                            dimension = { width: new_width };
                        }
                    } else {
                        if ( ( bookWidth / bookHeight ) >= ( img_width / img_height ) ) {
                            xpad = ( bookWidth / 2 ) - ( img_width * ( bookHeight / img_height )  / 2 );
                            dimension = { height: bookHeight };
                        } else {
                            ypad = ( bookHeight / 2 ) - ( img_height * ( bookWidth / img_width )  / 2 );
                            dimension = { width: bookWidth };          
                        }

                        var image = fs.readFileSync(imagePath);
                        var rgb = colorThief.getColor(image);
                        var onecolor = require('onecolor');
                        var rgbCode = 'rgb( ' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')'; // 'rgb(r, g, b)'
                        hex = onecolor(rgbCode).hex();

                    }


                    doc.addPage().rect(0,0,bookWidth,bookHeight).fill(hex).image(imagePath, xpad, ypad, dimension);

                    // add URL for debugging
                    // doc.fillColor("#000000").font('./font/CooHew-Roman.ttf').fontSize(7).text(popped, 0, 320, { width: (bookWidth - 20), align: 'left' });

                    // add page number
                    doc.fillColor("#dddddd").font('./font/CooHew-Roman.ttf').fontSize(7).text(pageNumber, 0, 320, { width: (bookWidth - 20), align: 'right' });
                    pageNumber = pageNumber + 1;
                                            
                    callback;
                        

            }
        }
    },
    function (err) {
        console.log(err);
    });
}




// make Index
doc.addPage();

var indexPageNumber = 1;
var creditHeight = 40;
var creditMargin = 20;
var creditX = creditMargin;
var numberPerPage = 16;

doc.fillColor("#000000").font('./font/CooHew-Bold.ttf').fontSize(28).text('INDEX', creditX, creditMargin, { width: bookWidth / 2, align: 'left' });

for (var i = 1; i <= 9; i++) { 
    var myData = require('./json/'+i+'.json');

    async.forEach(myData.objects, function(object, callback) {

        if (typeof object.images !== 'undefined') { 
            if (typeof object.images[0] !== 'undefined') { 
					
					if (indexPageNumber % numberPerPage == 0) { 					
						// add page number
						doc.fillColor("#dddddd").font('./font/CooHew-Roman.ttf').fontSize(7).text(pageNumber, 0, 320, { width: (bookWidth - 20), align: 'right' });
						pageNumber = pageNumber + 1;
											
						doc.addPage();
					}

					if (indexPageNumber % numberPerPage < ( numberPerPage / 2) ) { 					
						creditX = creditMargin;
					} else {
						creditX = ( bookWidth / 2 ) + ( creditMargin / 2 );
					}
					var creditY = ( ( indexPageNumber % ( numberPerPage / 2)  ) * creditHeight ) + creditMargin;

					var credit = '';
                    credit += object.title + '. ';
                    if (object.medium !== null) { credit += object.medium + '. '; }
                    if (object.creditline !== null) { credit += object.creditline + '. '; }
                    if (object.accession_number !== null) { credit += object.accession_number + '. '; }
                    credit += "\n\n";

					// Add page number
					doc.fillColor("#333333").font('./font/CooHew-Roman.ttf').fontSize(7).text(indexPageNumber, creditX, creditY, {
					  width: 100,
					  height: creditHeight,
					  align: 'left'
					});

					doc.fillColor("#333333").font('./font/CooHew-Roman.ttf').fontSize(7).text(credit, creditX + 24, creditY, {
					  width: ( bookWidth / 2 ) - 50,
					  height: creditHeight,
					  align: 'left'
					});
                    
                    indexPageNumber = indexPageNumber + 1;

                    callback;

            }
        }
    },
    function (err) {
        console.log(err);
    });

}


// add last page number
doc.fillColor("#dddddd").font('./font/CooHew-Roman.ttf').fontSize(7).text(pageNumber, 0, 320, { width: (bookWidth - 20), align: 'right' });
pageNumber = pageNumber + 1;


			
// and print!		
doc.end();