'use strict';

var fs = require('fs');
var test = require('tape');

// We should only test headless code here.
// http://stackoverflow.com/questions/21358015/error-jquery-requires-a-window-with-a-document#25622933

require('../../../src/ImageSequencer.js');

// This function is used to test whether or not any additional global variables are being created
function copy(g, a) {
  var b = {};
  var i = 0;
  for (var v in a)
    if (g) {
      if (v != "sequencer") b[v] = a[v];
    }
    else {
      if (v != "sequencer" && v != "global1" && v != "global2" && !global1.hasOwnProperty(v)) i++;
    }
  if (g) return b;
  else return i;
}
var parent = (typeof (global) === "undefined") ? window : global;
var global1 = copy(true, parent);

var sequencer = ImageSequencer({ ui: false });
var red = "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUFhYaHSUfGhsjHBYWICwgIyYnKSopGR8tMC0oMCUoKSj/2wBDAQcHBwoIChMKChMoGhYaKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCj/wAARCAAQABADASIAAhEBAxEB/8QAFQABAQAAAAAAAAAAAAAAAAAAAAf/xAAUEAEAAAAAAAAAAAAAAAAAAAAA/8QAFQEBAQAAAAAAAAAAAAAAAAAABgj/xAAUEQEAAAAAAAAAAAAAAAAAAAAA/9oADAMBAAIRAxEAPwCdABykX//Z";

test('Image Sequencer has tests', function(t) {
  t.equal(true, true, "Initial Test");
  t.end();
});

test('loadImages loads a DataURL image and creates a step.', function(t) {
  sequencer.loadImages(red);
  t.equal(sequencer.steps.length, 1, "Initial Step Created");
  t.equal(typeof (sequencer.steps[0].output.src), "string", "Initial output exists");
  t.end();
});

test('modulesInfo() returns info for each module', function(t) {
  var info = sequencer.modulesInfo();
  t.equal(Object.keys(info).length, Object.keys(sequencer.modules).length);
  t.equal(info.hasOwnProperty(Object.keys(sequencer.modules)[0]), true);
  t.equal(info[Object.keys(sequencer.modules)[0]].hasOwnProperty('name'), true);
  t.equal(info[Object.keys(sequencer.modules)[0]].hasOwnProperty('inputs'), true);
  t.end();
});

if (!sequencer.options.inBrowser)
  test('loadImage loads an image from URL and creates a step. (NodeJS)', function(t) {
    require('dns').resolve('www.github.com', function(err) {
      if (err) {
        console.log("Test aborted due to no internet");
        t.end();
      }
      else {
        sequencer.loadImage('URL', 'https://ccpandhare.github.io/image-sequencer/examples/images/red.jpg', function() {
          t.equal(sequencer.steps.length, 1, "Initial Step Created");
          t.equal(typeof (sequencer.steps[0].output.src), "string", "Initial output exists");
          t.end();
        });
      }
    });
  });

if (!sequencer.options.inBrowser)
  test('loadImages loads an image from PATH and creates a step. (NodeJS)', function(t) {
    sequencer.loadImages('examples/images/red.jpg');
    t.equal(sequencer.steps.length, 1, "Initial Step Created");
    t.equal(typeof (sequencer.steps[0].output.src), "string", "Initial output exists");
    t.end();
  });

test('loadImage works too.', function(t) {
  sequencer.loadImage(red);
  t.equal(sequencer.steps.length, 1, "Initial Step Created");
  t.equal(typeof (sequencer.steps[0].output.src), "string", "Initial output exists");
  t.end();
});

test('addSteps("name") adds a step', function(t) {
  sequencer.addSteps('channel');
  t.equal(sequencer.steps.length, 2, "Length of steps increased");
  t.equal(sequencer.steps[1].options.name, "channel", "Correct Step Added");
  t.end();
});

test('addSteps(["name"]) adds a step', function(t) {
  sequencer.addSteps(['channel', 'invert']);
  t.equal(sequencer.steps.length, 4, "Length of steps increased by two")
  t.equal(sequencer.steps[2].options.name, "channel", "Correct Step Added");
  t.equal(sequencer.steps[3].options.name, "invert", "Correct Step Added");
  t.end();
});

test('addSteps("name",o) adds a step', function(t) {
  sequencer.addSteps('channel', {});
  t.equal(sequencer.steps.length, 5, "Length of steps increased");
  t.equal(sequencer.steps[4].options.name, "channel", "Correct Step Added");
  t.end();
});


test('removeSteps(position) removes a step', function(t) {
  sequencer.removeSteps( 1);
  t.equal(sequencer.steps.length, 4, "Length of steps reduced");
  t.end();
});

test('removeSteps([positions]) removes steps', function(t) {
  sequencer.removeSteps([1, 2]);
  t.equal(sequencer.steps.length, 2, "Length of steps reduced");
  t.end();
});

test('insertSteps(position,"module",options) inserts a step', function(t) {
  sequencer.insertSteps( 1, 'channel', {});
  t.equal(sequencer.steps.length, 3, "Length of Steps increased");
  t.equal(sequencer.steps[1].options.name, "channel", "Correct Step Inserted");
  t.end();
});

test('insertSteps(position,"module") inserts a step', function(t) {
  sequencer.insertSteps(1, 'channel');
  t.equal(sequencer.steps.length, 4, "Length of Steps increased");
  t.equal(sequencer.steps[1].options.name, "channel", "Correct Step Inserted");
  t.end();
});



test('getSteps() returns correct array of steps', function(t){
  var sequencer = ImageSequencer({ ui: false });
  sequencer.loadImages('test', red);
  sequencer.addSteps(['blur','invert']);
  var stepsArray = sequencer.getSteps('test');  
  t.equal(stepsArray.length, sequencer.steps.length, "getSteps() returns correct length of steps");
  var flag=0;
  for (var i = 0; i<sequencer.steps.length; i++){
    if(stepsArray[i].options.name==(sequencer.steps[i].options.name))
    continue
    else
    flag=1;
  }
  t.equal(flag, 0, "getSteps() returns correct array of steps");
  t.end();
})


test('run() runs the sequencer and returns output to callback', function(t) {
  sequencer.run(function(out) {
    t.equal(typeof (sequencer.steps[sequencer.steps.length - 1].output), "object", "Output is Generated");
    t.equal(out, sequencer.steps[sequencer.steps.length - 1].output.src, "Output callback works");
    t.end();
  });
});


test('getStep(offset) returns the step at offset distance relative to current step', function(t) {
  sequencer.addSteps('invert', {});
  sequencer.addSteps('blend', {});
  sequencer.run({ mode: 'test' }, function(out) {
    t.equal(!!out, true, "Blend generates output");
    t.end();
  });
});

test('toCliString() returns the CLI command for the sequence', function(t) {
  t.deepEqual(sequencer.toCliString(), `sequencer -i [PATH] -s "channel channel channel invert blend" -d '{"channel":"green","offset":-2}'`, "works correctly");
  t.end();
});

test('blend returns different output depending on the set offset', function(t) {
  sequencer.addSteps('invert', {});
  sequencer.addSteps('invert', {});
  sequencer.addSteps('blend', {});
  // because we've added blend before, so instead of -3 we set it to -4
  sequencer.addSteps('blend', {'offset': -4});
  sequencer.run({ mode: 'test' }, function(out) {
    t.notStrictEqual(out, sequencer.steps[sequencer.steps.length - 2].output.src, 'different offsets give different output');
    t.end();
  });
});

test('replaceImage returns false in NodeJS', function(t) {
  var returnvalue = (sequencer.options.inBrowser) ? false : sequencer.replaceImage("#selector", "test");
  t.equal(returnvalue, false, "It does.");
  t.end();
});

var global2 = copy(false, parent);
test('No Global Variables Created', function(t) {
  t.equal(0, global2, "None Created.");
  t.end();
});