var undo_stack = [];

jQuery.delegate = function(rules) {
  return function(e) {
    var target = $(e.target);
    for (var selector in rules) {
      if (target.is(selector)) {
        return rules[selector].apply(this, $.makeArray(arguments));
      }
    }
  };
};

$(document).ajaxSend(function(e, xhr, options) {
  var token = $("meta[name='csrf-token']").attr("content");
  xhr.setRequestHeader("X-CSRF-Token", token);
});

function asyncDeleteForm(obj, options) {
  $.ajax($.extend({
    type: "DELETE",
    url: obj.attr('action'),
    beforeSend: function(xhr) {
      xhr.setRequestHeader("Accept", "application/json");
    },
    dataType: 'json',
    success: function(msg){
      display = msg.undo_message;
      if (msg.undo_path) {
        display += '<span class="undo-link"> (<a class="undo-link" href="' + msg.undo_path + '">undo</a>)</span>';
        undo_stack.push(msg.undo_path);
      }
      humanMsg.displayMsg(display);
    },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
      humanMsg.displayMsg( 'Could not delete item, or maybe it has already been deleted' );
    }
  }, options || {}));
}

function processUndo(path, options) {
  $.ajax($.extend({
    type: "POST",
    url: path,
    beforeSend: function(xhr) {
      xhr.setRequestHeader("Accept", "application/json");
    },
    dataType: 'json',
    success: function(msg){
      humanMsg.displayMsg( msg.message );
    },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
      humanMsg.displayMsg( 'Could not undo' );
    }
  }, options || {}));

  // Assume success and remove undo link
  $('a.undo-link[href=' + path + ']').parent('span').hide();
  undo_stack = jQuery.grep(undo_stack, function(e) {
    return e != path;
  });
}

function asyncUndoBehaviour(options) {
  $('#humanMsgLog').click($.delegate({
    'a.undo-link': function(e) {
      processUndo(jQuery(e.target).attr('href'), options);
      return false;
    }
  }));
  jQuery.each(["Ctrl+Z", "Meta+Z"], function () {
    shortcut.add(this, function() {
      item = undo_stack.pop();
      if (item) {
        processUndo(item, options);
      } else {
        humanMsg.displayMsg("Nothing to undo");
      }
    });
  });
}

function onDeleteFormClick() {
  asyncDeleteForm($(this));

  // Assume success and remove item
  $(this).parent('td').parent('tr').remove();
  return false;
}

function destroyAndUndoBehaviour(type) {
  return function (){
    asyncUndoBehaviour({
      success: function(msg){
        humanMsg.displayMsg( msg.message );
        $.get('/admin/' + type + '/' + msg.obj.id, function(data) {
          $('table tbody').append(data);

          $('form.delete-item').unbind('submit', onDeleteFormClick);
          $('form.delete-item').submit(onDeleteFormClick);
        });
      }
    });

    $('form.delete-item').submit(onDeleteFormClick);
  };
}

$(document).ready(function() {
  $(['posts', 'comments', 'pages']).each(function() {
    if ($('#' + this).length > 0) {
      destroyAndUndoBehaviour(this)();
    }
  });
});