var _ = require('lodash');
var actions = require('../actions');

module.exports = function(oldProfile, action) {

  switch(action.type) {

    case actions.launcher.LOAD_PROFILE_SUCCESS:
      return _.cloneDeep(action.profile);

    case actions.edit.MOVE_PROFILE_ITEM:
      return moveProfileItem(oldProfile, action.movedItem, action.targetItem);

    case actions.edit.ADD_PROFILE_ITEM:
      return addProfileItem(oldProfile, action.newItem, action.targetItem);

    default:
      return oldProfile || null;

  }

};


function moveProfileItem(oldProfile, movedItem, targetItem) {

  var newProfile = _.cloneDeep(oldProfile);
  var previousParent = treeFind(newProfile, movedItem).parent;
  var newParent = treeFind(newProfile, targetItem).item;

  previousParent.items = _.reject(previousParent.items, function(item) {
    return _.isEqual(item, movedItem);
  });

  newParent.items = newParent.items || [];
  newParent.items.push(_.cloneDeep(movedItem));

  return newProfile;

}

function addProfileItem(oldProfile, newItem, targetItem) {

  var newProfile = _.cloneDeep(oldProfile);
  var newParent = treeFind(newProfile, targetItem).item;

  newParent.items = newParent.items || [];
  newParent.items.push(_.cloneDeep(newItem));

  return newProfile;
}

function treeFind(branch, obj) {

  var items = branch.items;

  if(!items) return;

  for( var i = 0, item = items[i]; (item = items[i]); i++ ) {

    if( _.isEqual(item, obj) ) {
      return {item: item, parent: branch};
    }

    if(item.items) {
      var result = treeFind(item, obj);
      if(result) return result;
    }

  }

}