# encoding: UTF-8

# Copyright 2011 innoQ Deutschland GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

class ConceptsController < ApplicationController

  def index
    authorize! :read, Concept::Base

    respond_to do |format|
      format.json do # Search for widget
        scope = Iqvoc::Concept.base_class.editor_selectable.with_pref_labels.
            merge(Label::Base.by_query_value("#{params[:query]}%"))
        scope = scope.where(:top_term => false) if params[:exclude_top_terms]
        @concepts = scope.all.map { |concept| concept_widget_data(concept) }
        render :json => @concepts
      end
      format.all do # RDF full export
        authorize! :full_export, Concept::Base
      end
    end
  end

  def show
    scope = Iqvoc::Concept.base_class.
      by_origin(params[:id]).
      with_associations
    published = params[:published] == '1' || !params[:published]
    if published
      scope = scope.published
      @new_concept_version = Iqvoc::Concept.base_class.by_origin(params[:id]).unpublished.last
    else
      scope = scope.unpublished
    end

    @concept = scope.last
    raise ActiveRecord::RecordNotFound unless @concept

    authorize! :read, @concept

    respond_to do |format|
      format.html do
        # When in single query mode, AR handles ALL includes to be loaded by that
        # one query. We don't want that! So let's do it manually :-)
        ActiveRecord::Associations::Preloader.new(@concept,
          Iqvoc::Concept.base_class.default_includes + [:collection_members => {:collection => :labels},
          :broader_relations => {:target => [:pref_labels, :broader_relations]},
          :narrower_relations => {:target => [:pref_labels, :narrower_relations]}]).run

        published ? render('show_published') : render('show_unpublished')
      end
      format.json do
        # When in single query mode, AR handles ALL includes to be loaded by that
        # one query. We don't want that! So let's do it manually :-)
        ActiveRecord::Associations::Preloader.new(@concept, [:labels,
            { :relations => { :target => [:labelings, :relations] } }]).run

        published_relations = lambda { |concept|
          return concept.relations.includes(:target).
              merge(Iqvoc::Concept.base_class.published)
        }
        concept_data = {
          :origin => @concept.origin,
          :labels => @concept.labelings.map { |ln| labeling_as_json(ln) },
          :relations => published_relations.call(@concept).map { |relation|
            concept = relation.target
            {
              :origin => concept.origin,
              :labels => concept.labelings.map { |ln| labeling_as_json(ln) },
              :relations => published_relations.call(concept).count
            }
          }
        }
        render :json => concept_data
      end
      format.ttl
      format.rdf
    end
  end

  def new
    authorize! :create, Iqvoc::Concept.base_class

    @concept = Iqvoc::Concept.base_class.new

    Iqvoc::Concept.note_class_names.each do |note_class_name|
      @concept.send(note_class_name.to_relation_name).build if @concept.send(note_class_name.to_relation_name).empty?
    end
  end

  def create
    authorize! :create, Iqvoc::Concept.base_class

    @concept = Iqvoc::Concept.base_class.new(params[:concept])
    if @concept.save
      flash[:success] = I18n.t("txt.controllers.versioned_concept.success")
      redirect_to concept_path(:published => 0, :id => @concept.origin)
    else
      flash.now[:error] = I18n.t("txt.controllers.versioned_concept.error")
      render :new
    end
  end

  def edit
    @concept = Iqvoc::Concept.base_class.by_origin(params[:id]).unpublished.last
    raise ActiveRecord::RecordNotFound unless @concept

    authorize! :update, @concept

    @association_objects_in_editing_mode = @concept.associated_objects_in_editing_mode

    if params[:full_consistency_check]
      @concept.valid_with_full_validation?
    end

    Iqvoc::Concept.note_class_names.each do |note_class_name|
      @concept.send(note_class_name.to_relation_name).build if @concept.send(note_class_name.to_relation_name).empty?
    end
  end

  def update
    @concept = Iqvoc::Concept.base_class.by_origin(params[:id]).unpublished.last
    raise ActiveRecord::RecordNotFound unless @concept

    authorize! :update, @concept

    if @concept.update_attributes(params[:concept])
      flash[:success] = I18n.t("txt.controllers.versioned_concept.update_success")
      redirect_to concept_path(:published => 0, :id => @concept)
    else
      flash.now[:error] = I18n.t("txt.controllers.versioned_concept.update_error")
      render :action => :edit
    end
  end

  def destroy
    @new_concept = Iqvoc::Concept.base_class.by_origin(params[:id]).unpublished.last
    raise ActiveRecord::RecordNotFound unless @new_concept

    authorize! :destroy, @new_concept

    if @new_concept.destroy
      flash[:success] = I18n.t("txt.controllers.concept_versions.delete")
      redirect_to dashboard_path
    else
      flash[:success] = I18n.t("txt.controllers.concept_versions.delete_error")
      redirect_to concept_path(:published => 0, :id => @new_concept)
    end
  end

  protected

  # TODO: rename to match the behavior of the method
  def labeling_as_json(labeling)
    label = labeling.target
    return {
      :origin => label.origin,
      :reltype => labeling.type.to_relation_name,
      :value => label.value,
      :lang => label.language
      # TODO: relations (XL only)
    }
  end

end