// ==========================================================================
//
// FullScreen
// Adds fullscreen functionality
//
// ==========================================================================
(function(document, $) {
  "use strict";

  // Collection of methods supported by user browser
  var fn = (function() {
    var fnMap = [
      ["requestFullscreen", "exitFullscreen", "fullscreenElement", "fullscreenEnabled", "fullscreenchange", "fullscreenerror"],
      // new WebKit
      [
        "webkitRequestFullscreen",
        "webkitExitFullscreen",
        "webkitFullscreenElement",
        "webkitFullscreenEnabled",
        "webkitfullscreenchange",
        "webkitfullscreenerror"
      ],
      // old WebKit (Safari 5.1)
      [
        "webkitRequestFullScreen",
        "webkitCancelFullScreen",
        "webkitCurrentFullScreenElement",
        "webkitCancelFullScreen",
        "webkitfullscreenchange",
        "webkitfullscreenerror"
      ],
      [
        "mozRequestFullScreen",
        "mozCancelFullScreen",
        "mozFullScreenElement",
        "mozFullScreenEnabled",
        "mozfullscreenchange",
        "mozfullscreenerror"
      ],
      ["msRequestFullscreen", "msExitFullscreen", "msFullscreenElement", "msFullscreenEnabled", "MSFullscreenChange", "MSFullscreenError"]
    ];

    var ret = {};

    for (var i = 0; i < fnMap.length; i++) {
      var val = fnMap[i];

      if (val && val[1] in document) {
        for (var j = 0; j < val.length; j++) {
          ret[fnMap[0][j]] = val[j];
        }

        return ret;
      }
    }

    return false;
  })();

  // If browser does not have Full Screen API, then simply unset default button template and stop
  if (!fn) {
    if ($ && $.fancybox) {
      $.fancybox.defaults.btnTpl.fullScreen = false;
    }

    return;
  }

  var FullScreen = {
    request: function(elem) {
      elem = elem || document.documentElement;

      elem[fn.requestFullscreen](elem.ALLOW_KEYBOARD_INPUT);
    },
    exit: function() {
      document[fn.exitFullscreen]();
    },
    toggle: function(elem) {
      elem = elem || document.documentElement;

      if (this.isFullscreen()) {
        this.exit();
      } else {
        this.request(elem);
      }
    },
    isFullscreen: function() {
      return Boolean(document[fn.fullscreenElement]);
    },
    enabled: function() {
      return Boolean(document[fn.fullscreenEnabled]);
    }
  };

  $.extend(true, $.fancybox.defaults, {
    btnTpl: {
      fullScreen:
        '<button data-fancybox-fullscreen class="fancybox-button fancybox-button--fullscreen" title="{{FULL_SCREEN}}">' +
        '<svg viewBox="0 0 40 40">' +
        '<path d="M9,12 v16 h22 v-16 h-22 v8" />' +
        "</svg>" +
        "</button>"
    },
    fullScreen: {
      autoStart: false
    }
  });

  $(document).on({
    "onInit.fb": function(e, instance) {
      var $container;

      if (instance && instance.group[instance.currIndex].opts.fullScreen) {
        $container = instance.$refs.container;

        $container.on("click.fb-fullscreen", "[data-fancybox-fullscreen]", function(e) {
          e.stopPropagation();
          e.preventDefault();

          FullScreen.toggle();
        });

        if (instance.opts.fullScreen && instance.opts.fullScreen.autoStart === true) {
          FullScreen.request();
        }

        // Expose API
        instance.FullScreen = FullScreen;
      } else if (instance) {
        instance.$refs.toolbar.find("[data-fancybox-fullscreen]").hide();
      }
    },

    "afterKeydown.fb": function(e, instance, current, keypress, keycode) {
      // "F"
      if (instance && instance.FullScreen && keycode === 70) {
        keypress.preventDefault();

        instance.FullScreen.toggle();
      }
    },

    "beforeClose.fb": function(e, instance) {
      if (instance && instance.FullScreen && instance.$refs.container.hasClass("fancybox-is-fullscreen")) {
        FullScreen.exit();
      }
    }
  });

  $(document).on(fn.fullscreenchange, function() {
    var isFullscreen = FullScreen.isFullscreen(),
      instance = $.fancybox.getInstance();

    if (instance) {
      // If image is zooming, then force to stop and reposition properly
      if (instance.current && instance.current.type === "image" && instance.isAnimating) {
        instance.current.$content.css("transition", "none");

        instance.isAnimating = false;

        instance.update(true, true, 0);
      }

      instance.trigger("onFullscreenChange", isFullscreen);

      instance.$refs.container.toggleClass("fancybox-is-fullscreen", isFullscreen);
    }
  });
})(document, window.jQuery || jQuery);