var defaultHtmlSequencerUi = require('./lib/defaultHtmlSequencerUi.js'),
  setupCache = require('./lib/cache.js'),
  intermediateHtmlStepUi = require('./lib/intermediateHtmlStepUi.js'),
  DefaultHtmlStepUi = require('./lib/defaultHtmlStepUi.js'),
  urlHash = require('./lib/urlHash.js'),
  insertPreview = require('./lib/insertPreview.js');

window.onload = function() {
  sequencer = ImageSequencer();

  function refreshOptions() {
    // Load information of all modules (Name, Inputs, Outputs)
    var modulesInfo = sequencer.modulesInfo();

    var addStepSelect = $('#addStep select');
    addStepSelect.html('');

    // Add modules to the addStep dropdown
    for (var m in modulesInfo) {
      if (modulesInfo[m] && modulesInfo[m].name)
        addStepSelect.append(
          '<option value="' + m + '">' + modulesInfo[m].name + '</option>'
        );
    }
    // Null option
    addStepSelect.append('<option value="" disabled selected>Select a Module</option>');
    addStepSelect.selectize({
      sortField: 'text'
    });
  }
  refreshOptions();

  $(window).on('scroll', scrollFunction);

  function scrollFunction() {
    var shouldDisplay = $('body').scrollTop() > 20 || $(':root').scrollTop() > 20;

    $('#move-up').css({
      display: shouldDisplay ? 'block' : 'none'
    });
  }


  function topFunction() {
    $('body').animate({scrollTop: 0});
    $(':root').animate({scrollTop: 0});
  }

  $('#move-up').on('click', topFunction);


  // UI for each step:
  sequencer.setUI(DefaultHtmlStepUi(sequencer));

  // UI for the overall demo:
  var ui = defaultHtmlSequencerUi(sequencer);

  // find any `src` parameters in URL hash and attempt to source image from them and run the sequencer
  if (urlHash.getUrlHashParameter('src')) {
    sequencer.loadImage(urlHash.getUrlHashParameter('src'), ui.onLoad);
  } else {
    sequencer.loadImage('images/tulips.png', ui.onLoad);
  }

  var resetSequence = function(){
    var r = confirm('Do you want to reset the sequence?');
    if (r)
      window.location = '/';
  };

  $('#addStep select').on('change', ui.selectNewStepUi);
  $('#addStep #add-step-btn').on('click', ui.addStepUi);
  $('#resetButton').on('click', resetSequence);

  //Module button radio selection
  $('.radio-group .radio').on('click', function() {
    $(this).parent().find('.radio').removeClass('selected');
    $(this).addClass('selected');
    newStep = $(this).attr('data-value');
    //$("#addStep option[value=" + newStep + "]").attr('selected', 'selected');
    $('#addStep select').val(newStep);
    ui.selectNewStepUi(newStep);
    ui.addStepUi(newStep);
    $(this).removeClass('selected');
  });

  function displayMessageOnSaveSequence(){
    $('.savesequencemsg').fadeIn();
    setTimeout(function() {
      $('.savesequencemsg').fadeOut();
    }, 1000);
  }

  $('body').on('click', 'button.remove', ui.removeStepUi);
  $('#save-seq').click(() => {
    var result = window.prompt('Please give a name to your sequence... (Saved sequence will only be available in this browser).');
    if(result){
      result = result + ' (local)';
      sequencer.saveSequence(result, sequencer.toString());
      sequencer.loadModules();
      displayMessageOnSaveSequence();
      refreshOptions();
    }
  });

  var isWorkingOnGifGeneration = false;

  $('.js-view-as-gif').on('click', function(event) {
    // Prevent user from triggering generation multiple times
    if (isWorkingOnGifGeneration) return;

    isWorkingOnGifGeneration = true;

    var button = event.target;
    button.disabled = true;
    button.innerHTML = '<i class="fa fa-circle-o-notch fa-spin"></i>';

    try {
      // Select all images from previous steps
      var imgs = document.getElementsByClassName('step-thumbnail');

      var imgSrcs = [];

      for (var i = 0; i < imgs.length; i++) {
        imgSrcs.push(imgs[i].src);
      }

      var options = {
        'gifWidth': imgs[0].width,
        'gifHeight': imgs[0].height,
        'images': imgSrcs,
        'frameDuration': 7,
      };

      gifshot.createGIF(options, function(obj) {
        if (!obj.error) {
          // Final gif encoded with base64 format
          var image = obj.image;
          var animatedImage = document.createElement('img');

          animatedImage.id = 'gif_element';
          animatedImage.src = image;


          var modal = $('#js-download-gif-modal');

          $('#js-download-as-gif-button').one('click', function() {
            // Trigger download
            download(image, 'index.gif', 'image/gif');

            // Close modal
            modal.modal('hide');
          });

          var gifContainer = document.getElementById('js-download-modal-gif-container');

          // Clear previous results
          gifContainer.innerHTML = '';

          // Insert image
          gifContainer.appendChild(animatedImage);


          // Open modal
          modal.modal();

          button.disabled = false;
          button.innerHTML = 'View GIF';
          isWorkingOnGifGeneration = false;
        }
      });
    }
    catch (e) {
      console.error(e);
      button.disabled = false;
      button.innerHTML = 'View GIF';
      isWorkingOnGifGeneration = false;

    }
  });

  // image selection and drag/drop handling from examples/lib/imageSelection.js
  sequencer.setInputStep({
    dropZoneSelector: '#dropzone',
    fileInputSelector: '#fileInput',
    takePhotoSelector: '#take-photo',
    onLoad: function onFileReaderLoad(progress) {
      var reader = progress.target;
      var step = sequencer.steps[0];
      var util = intermediateHtmlStepUi(sequencer);
      step.output.src = reader.result;
      sequencer.run({ index: 0 });
      if(typeof step.options !== 'undefined')
        step.options.step.imgElement.src = reader.result;
      else
        step.imgElement.src = reader.result;
      insertPreview.updatePreviews(reader.result, '#addStep');
      insertPreview.updatePreviews(sequencer.steps[0].imgElement.src, '.insertDiv');
    },
    onTakePhoto: function (url) {
      var step = sequencer.steps[0];
      step.output.src = url;
      sequencer.run({ index: 0 });
      if(typeof step.options !== 'undefined')
        step.options.step.imgElement.src = url;
      else
        step.imgElement.src = url;
      insertPreview.updatePreviews(url, '#addStep');
      insertPreview.updatePreviews(sequencer.steps[0].imgElement.src, '.insertDiv');
    }
  });

  setupCache();

  if (urlHash.getUrlHashParameter('src')) {
    insertPreview.updatePreviews(urlHash.getUrlHashParameter('src'), '#addStep');
  } else {
    insertPreview.updatePreviews('images/tulips.png', '#addStep');
  }
};