const fs = require('fs')
const gm = require('gm').subClass({ imageMagick: '7+' });

const fs = require('fs')
const gm = require('gm').subClass({ imageMagick: true });

const fs = require('fs')
const gm = require('gm').subClass({
  appPath: String.raw`C:\Program Files\ImageMagick-7.1.0-Q16-HDRI\magick.exe`
});

var fs = require('fs')
  , gm = require('gm');

// resize and remove EXIF profile data
gm('/path/to/my/img.jpg')
.resize(240, 240)
.noProfile()
.write('/path/to/resize.png', function (err) {
  if (!err) console.log('done');
});

// some files would not be resized appropriately
// http://stackoverflow.com/questions/5870466/imagemagick-incorrect-dimensions
// you have two options:
// use the '!' flag to ignore aspect ratio
gm('/path/to/my/img.jpg')
.resize(240, 240, '!')
.write('/path/to/resize.png', function (err) {
  if (!err) console.log('done');
});

// use the .resizeExact with only width and/or height arguments
gm('/path/to/my/img.jpg')
.resizeExact(240, 240)
.write('/path/to/resize.png', function (err) {
  if (!err) console.log('done');
});

// obtain the size of an image
gm('/path/to/my/img.jpg')
.size(function (err, size) {
  if (!err)
    console.log(size.width > size.height ? 'wider' : 'taller than you');
});

// output all available image properties
gm('/path/to/img.png')
.identify(function (err, data) {
  if (!err) console.log(data)
});

// pull out the first frame of an animated gif and save as png
gm('/path/to/animated.gif[0]')
.write('/path/to/firstframe.png', function (err) {
  if (err) console.log('aaw, shucks');
});

// auto-orient an image
gm('/path/to/img.jpg')
.autoOrient()
.write('/path/to/oriented.jpg', function (err) {
  if (err) ...
})

// crazytown
gm('/path/to/my/img.jpg')
.flip()
.magnify()
.rotate('green', 45)
.blur(7, 3)
.crop(300, 300, 150, 130)
.edge(3)
.write('/path/to/crazy.jpg', function (err) {
  if (!err) console.log('crazytown has arrived');
})

// annotate an image
gm('/path/to/my/img.jpg')
.stroke("#ffffff")
.drawCircle(10, 10, 20, 10)
.font("Helvetica.ttf", 12)
.drawText(30, 20, "GMagick!")
.write("/path/to/drawing.png", function (err) {
  if (!err) console.log('done');
});

// creating an image
gm(200, 400, "#ddff99f3")
.drawText(10, 50, "from scratch")
.write("/path/to/brandNewImg.jpg", function (err) {
  // ...
});

// passing a stream
var readStream = fs.createReadStream('/path/to/my/img.jpg');
gm(readStream, 'img.jpg')
.write('/path/to/reformat.png', function (err) {
  if (!err) console.log('done');
});


// passing a downloadable image by url

var request = require('request');
var url = "www.abc.com/pic.jpg"

gm(request(url))
.write('/path/to/reformat.png', function (err) {
  if (!err) console.log('done');
});


// can also stream output to a ReadableStream
// (can be piped to a local file or remote server)
gm('/path/to/my/img.jpg')
.resize('200', '200')
.stream(function (err, stdout, stderr) {
  var writeStream = fs.createWriteStream('/path/to/my/resized.jpg');
  stdout.pipe(writeStream);
});

// without a callback, .stream() returns a stream
// this is just a convenience wrapper for above.
var writeStream = fs.createWriteStream('/path/to/my/resized.jpg');
gm('/path/to/my/img.jpg')
.resize('200', '200')
.stream()
.pipe(writeStream);

// pass a format or filename to stream() and
// gm will provide image data in that format
gm('/path/to/my/img.jpg')
.stream('png', function (err, stdout, stderr) {
  var writeStream = fs.createWriteStream('/path/to/my/reformatted.png');
  stdout.pipe(writeStream);
});

// or without the callback
var writeStream = fs.createWriteStream('/path/to/my/reformatted.png');
gm('/path/to/my/img.jpg')
.stream('png')
.pipe(writeStream);

// combine the two for true streaming image processing
var readStream = fs.createReadStream('/path/to/my/img.jpg');
gm(readStream)
.resize('200', '200')
.stream(function (err, stdout, stderr) {
  var writeStream = fs.createWriteStream('/path/to/my/resized.jpg');
  stdout.pipe(writeStream);
});

// GOTCHA:
// when working with input streams and any 'identify'
// operation (size, format, etc), you must pass "{bufferStream: true}" if
// you also need to convert (write() or stream()) the image afterwards
// NOTE: this buffers the readStream in memory!
var readStream = fs.createReadStream('/path/to/my/img.jpg');
gm(readStream)
.size({bufferStream: true}, function(err, size) {
  this.resize(size.width / 2, size.height / 2)
  this.write('/path/to/resized.jpg', function (err) {
    if (!err) console.log('done');
  });
});

// A buffer can be passed instead of a filepath as well
var buf = require('fs').readFileSync('/path/to/image.jpg');

gm(buf, 'image.jpg')
.noise('laplacian')
.write('/path/to/out.jpg', function (err) {
  if (err) return handle(err);
  console.log('Created an image from a Buffer!');
});

/*
A buffer can also be returned instead of a stream
The first argument to toBuffer is optional, it specifies the image format
*/
gm('img.jpg')
.resize(100, 100)
.toBuffer('PNG',function (err, buffer) {
  if (err) return handle(err);
  console.log('done!');
})

gm()
.label('Offline')
.stream();

gm()
.out('label:Offline')
.stream();

gm('img.png').format(function (err, format) {

})

// is equivalent to

gm('img.png').identify('%m', function (err, format) {

})

gm.compare('/path/to/image1.jpg', '/path/to/another.png', function (err, isEqual, equality, raw, path1, path2) {
  if (err) return handle(err);

  // if the images were considered equal, `isEqual` will be true, otherwise, false.
  console.log('The images were equal: %s', isEqual);

  // to see the total equality returned by graphicsmagick we can inspect the `equality` argument.
  console.log('Actual equality: %d', equality);

  // inspect the raw output
  console.log(raw);

  // print file paths
  console.log(path1, path2);
})

gm.compare('/path/to/image1.jpg', '/path/to/another.png', 1.2, function (err, isEqual) {
  ...
})

var options = {
  file: '/path/to/diff.png',
  highlightColor: 'yellow',
  tolerance: 0.02
}
gm.compare('/path/to/image1.jpg', '/path/to/another.png', options, function (err, isEqual, equality, raw) {
  ...
})

gm('/path/to/image.jpg')
.composite('/path/to/second_image.jpg')
.geometry('+100+150')
.write('/path/to/composite.png', function(err) {
    if(!err) console.log("Written composite image.");
});

gm('/path/to/image.jpg')
.montage('/path/to/second_image.jpg')
.geometry('+100+150')
.write('/path/to/montage.png', function(err) {
    if(!err) console.log("Written montage image.");
});