// ==========================================================================
//
// SlideShow
// Enables slideshow functionality
//
// Example of usage:
// $.fancybox.getInstance().SlideShow.start()
//
// ==========================================================================
(function(document, $) {
  "use strict";

  $.extend(true, $.fancybox.defaults, {
    btnTpl: {
      slideShow:
        '<button data-fancybox-play class="fancybox-button fancybox-button--play" title="{{PLAY_START}}">' +
        '<svg viewBox="0 0 40 40">' +
        '<path d="M13,12 L27,20 L13,27 Z" />' +
        '<path d="M15,10 v19 M23,10 v19" />' +
        "</svg>" +
        "</button>"
    },
    slideShow: {
      autoStart: false,
      speed: 3000
    }
  });

  var SlideShow = function(instance) {
    this.instance = instance;
    this.init();
  };

  $.extend(SlideShow.prototype, {
    timer: null,
    isActive: false,
    $button: null,

    init: function() {
      var self = this;

      self.$button = self.instance.$refs.toolbar.find("[data-fancybox-play]").on("click", function() {
        self.toggle();
      });

      if (self.instance.group.length < 2 || !self.instance.group[self.instance.currIndex].opts.slideShow) {
        self.$button.hide();
      }
    },

    set: function(force) {
      var self = this;

      // Check if reached last element
      if (
        self.instance &&
        self.instance.current &&
        (force === true || self.instance.current.opts.loop || self.instance.currIndex < self.instance.group.length - 1)
      ) {
        self.timer = setTimeout(function() {
          if (self.isActive) {
            self.instance.jumpTo((self.instance.currIndex + 1) % self.instance.group.length);
          }
        }, self.instance.current.opts.slideShow.speed);
      } else {
        self.stop();
        self.instance.idleSecondsCounter = 0;
        self.instance.showControls();
      }
    },

    clear: function() {
      var self = this;

      clearTimeout(self.timer);

      self.timer = null;
    },

    start: function() {
      var self = this;
      var current = self.instance.current;

      if (current) {
        self.isActive = true;

        self.$button
          .attr("title", current.opts.i18n[current.opts.lang].PLAY_STOP)
          .removeClass("fancybox-button--play")
          .addClass("fancybox-button--pause");

        self.set(true);
      }
    },

    stop: function() {
      var self = this;
      var current = self.instance.current;

      self.clear();

      self.$button
        .attr("title", current.opts.i18n[current.opts.lang].PLAY_START)
        .removeClass("fancybox-button--pause")
        .addClass("fancybox-button--play");

      self.isActive = false;
    },

    toggle: function() {
      var self = this;

      if (self.isActive) {
        self.stop();
      } else {
        self.start();
      }
    }
  });

  $(document).on({
    "onInit.fb": function(e, instance) {
      if (instance && !instance.SlideShow) {
        instance.SlideShow = new SlideShow(instance);
      }
    },

    "beforeShow.fb": function(e, instance, current, firstRun) {
      var SlideShow = instance && instance.SlideShow;

      if (firstRun) {
        if (SlideShow && current.opts.slideShow.autoStart) {
          SlideShow.start();
        }
      } else if (SlideShow && SlideShow.isActive) {
        SlideShow.clear();
      }
    },

    "afterShow.fb": function(e, instance, current) {
      var SlideShow = instance && instance.SlideShow;

      if (SlideShow && SlideShow.isActive) {
        SlideShow.set();
      }
    },

    "afterKeydown.fb": function(e, instance, current, keypress, keycode) {
      var SlideShow = instance && instance.SlideShow;

      // "P" or Spacebar
      if (SlideShow && current.opts.slideShow && (keycode === 80 || keycode === 32) && !$(document.activeElement).is("button,a,input")) {
        keypress.preventDefault();

        SlideShow.toggle();
      }
    },

    "beforeClose.fb onDeactivate.fb": function(e, instance) {
      var SlideShow = instance && instance.SlideShow;

      if (SlideShow) {
        SlideShow.stop();
      }
    }
  });

  // Page Visibility API to pause slideshow when window is not active
  $(document).on("visibilitychange", function() {
    var instance = $.fancybox.getInstance();
    var SlideShow = instance && instance.SlideShow;

    if (SlideShow && SlideShow.isActive) {
      if (document.hidden) {
        SlideShow.clear();
      } else {
        SlideShow.set();
      }
    }
  });
})(document, window.jQuery || jQuery);