# Copyright (C) 2015 Centro de Computacao Cientifica e Software Livre
# Departamento de Informatica - Universidade Federal do Parana
#
# This file is part of portalmec.
#
# portalmec is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# portalmec is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with portalmec.  If not, see <http://www.gnu.org/licenses/>.

class V1::CollectionsController < ApplicationController
  include ::SociableController
  include ::DownloadableController
  include ::FollowableController
  include ::TaggableController
  include ::DeletedObjectsController
  include ::HighlightsController
  include ::Paginator
  include ::SubjectableController
  include ::StageableController

  before_action :authenticate_user!, only: [:create, :update, :destroy, :tagging, :untagging, :follow, :unfollow, :follow_toggle]
  before_action :set_collection, only: [:show, :update, :destroy, :add_object, :delete_object, :subjecting, :unsubjecting, :add_stages, :remove_stages, :follow, :unfollow, :follow_toggle]
  before_action :set_new_collection, only: :index
  before_action :authorize!, except: [:create, :tagging, :untagging, :download]

  # GET /v1/collections
  # GET /v1/collections.json
  def index
    collections = paginate policy_scope(Collection)
    render json: collections
  end

  # GET /v1/collections/1
  # GET /v1/collections/1.json
  def show
    render json: @collection
  end

  # POST /v1/collection
  # POST /v1/collection.json
  def create
    collection = Collection.new(collection_params)
    collection.owner = current_user if collection.owner.nil?
    authorize collection

    if collection.save
      collection_associations(collection)
      render json: collection, status: :created
    else
      render json: collection.errors, status: :unprocessable_entity
    end
  end

  # PUT/PATCH /v1/users/1
  # PUT/PATCH /v1/users/1.json
  def update
    if @collection.update(collection_params)
      collection_associations(@collection)
      render json: @collection, status: :ok
    else
      render json: @collection.errors, status: :unprocessable_entity
    end
  end

  # DELETE /v1/collections/1
  # DELETE /v1/collections/1.json
  def destroy
    items = @collection.collection_items.select(:id)
    if !items.blank?
      @collection.delete_items(items)
    end
    @collection.destroy
    response = { 'status': 'deleted' }
    render status: :ok, json: response
  end

  # POST /v1/collections/1/items
  def add_object
    return render nothing: true, status: :unprocessable_entity if extra_params.blank? || extra_params[:items].blank?
    errors = @collection.add_items(extra_params[:items])

    render json: {collection: CollectionSerializer.new(@collection, {scope: current_user, scope_name: :current_user}).serializable_hash, errors: errors}, status: :ok
  end

  # DELETE /v1/collections/1/items
  def delete_object
    return render nothing: true, status: :unprocessable_entity if extra_params.blank? || extra_params[:items].blank?
    @collection.really_delete_items(extra_params[:items])
    render json: @collection, status: :ok
  end


  private

  def deleted_resource; Collection; end
  def highlights_resource; Collection; end

  # social concerns methods
  def followable; set_collection; end
  def taggable; set_collection; end
  def sociable; set_collection; end
  def downloadable; set_collection; end
  def subjectable; set_collection; end
  def stageable; set_collection; end

  def set_collection
    @collection ||= Collection.where(id: params[:id]).first

    render status: :not_found if @collection.blank?

    @collection
  end

  def set_new_collection
    @collection ||= Collection.new
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def collection_params
    params.require(:collection).permit(:name, :curator, :description, :owner_id, :owner_type, :privacy, tags: [])
  end

  def extra_params
    return {} if params[:collection].nil?
    params[:collection].permit(subjects: [], educational_stages: [], items: [:id, :type, :position], tags: [:name])
  end

  def collection_associations(collection)
    if extra_params[:tags] == []
      current_user.untag(collection, with: @collection.tags.map { |t| t['name'] })
    elsif !extra_params[:tags].nil?
      current_user.tag(collection, with: extra_params[:tags].map { |t| t['name'] })
    end
    collection.add_subjects(ids: extra_params[:subjects]) unless extra_params[:subjects].nil?
    collection.add_educational_stages(ids: extra_params[:educational_stages]) unless extra_params[:educational_stages].nil?
    collection.add_items(extra_params[:items]) unless extra_params[:items].nil?
  end

  def authorize!
    authorize @collection
  end
end