#!/usr/bin/env node

var inputFolder = './';
var ext = '.png';

var fs = require('fs')
  , gm = require('gm')
  , spawn = require('child_process').spawn;

//gm(inputFolder + '0-0.png')
  //.append('ltr', inputFolder + '0-1.png', inputFolder + '0-2.png')
  //.write('./resize.png', function (err) {
  //console.log(err);
  //if (!err) console.log('done');
//});
//for (var i=0; i<7; i++){
//var i = 0;
//for (var j=0; j<3; j++){


var merge = function(cb, file1, file2, output){
  output = output || 'out.jpg';
  var p = spawn('gm', ['convert', '+append', file1, file2, output])

  p.stdout.on('data', function (data) {
  });

  p.stderr.on('data', function (data) {
    console.log('stderr: ' + data);
  });

  p.on('exit', function (code) {
    cb();
  });
}

var inject = function(i, j){
  var out = 'out';
  if (i>2) return;
  if (j>6){
    j = 0; i++;
  }

  var fileName1 = j==0 ? i + j.toString() : 'out';
  var fileName2 = (j+1) + i.toString();

  var file1 = inputFolder + fileName1 + ext;
  var file2 = inputFolder + fileName2 + ext;
  if (j==6) out = out + i;
  var output = inputFolder + out + ext;

  var cb = function(){
    inject(i, j+1);
  }
  merge(cb, file1, file2, output)
}

inject(0, 0);