class ArticlesController < ApplicationController
  before_action :authenticate_article_meta, :find_supplier

  def index
    sort = if params['sort']
             case params['sort']
             when 'name' then 'articles.name'
             when 'unit' then 'articles.unit'
             when 'article_category' then 'article_categories.name'
             when 'note' then 'articles.note'
             when 'availability' then 'articles.availability'
             when 'name_reverse' then 'articles.name DESC'
             when 'unit_reverse' then 'articles.unit DESC'
             when 'article_category_reverse' then 'article_categories.name DESC'
             when 'note_reverse' then 'articles.note DESC'
             when 'availability_reverse' then 'articles.availability DESC'
             end
           else
             'article_categories.name, articles.name'
           end

    @articles = Article.undeleted.where(supplier_id: @supplier, type: nil).includes(:article_category).order(sort)

    if request.format.csv?
      send_data ArticlesCsv.new(@articles, encoding: 'utf-8').to_csv, filename: 'articles.csv', type: 'text/csv'
      return
    end

    @articles = @articles.where('articles.name LIKE ?', "%#{params[:query]}%") unless params[:query].nil?

    @articles = @articles.page(params[:page]).per(@per_page)

    respond_to do |format|
      format.html
      format.js { render layout: false }
    end
  end

  def new
    @article = @supplier.articles.build(tax: FoodsoftConfig[:tax_default])
    render layout: false
  end

  def copy
    @article = @supplier.articles.find(params[:article_id]).dup
    render layout: false
  end

  def edit
    @article = Article.find(params[:id])
    render action: 'new', layout: false
  end

  def create
    @article = Article.new(params[:article])
    if @article.valid? && @article.save
      render layout: false
    else
      render action: 'new', layout: false
    end
  end

  # Updates one Article and highlights the line if succeded
  def update
    @article = Article.find(params[:id])

    if @article.update(params[:article])
      render layout: false
    else
      render action: 'new', layout: false
    end
  end

  # Deletes article from database. send error msg, if article is used in a current order
  def destroy
    @article = Article.find(params[:id])
    @article.mark_as_deleted unless @order = @article.in_open_order # If article is in an active Order, the Order will be returned
    render layout: false
  end

  # Renders a form for editing all articles from a supplier
  def edit_all
    @articles = @supplier.articles.undeleted
  end

  # Updates all article of specific supplier
  def update_all
    invalid_articles = false

    Article.transaction do
      if params[:articles].present?
        # Update other article attributes...
        @articles = Article.find(params[:articles].keys)
        @articles.each do |article|
          unless article.update(params[:articles][article.id.to_s])
            invalid_articles ||= true # Remember that there are validation errors
          end
        end

        raise ActiveRecord::Rollback if invalid_articles # Rollback all changes
      end
    end

    if invalid_articles
      # An error has occurred, transaction has been rolled back.
      flash.now.alert = I18n.t('articles.controller.error_invalid')
      render :edit_all
    else
      # Successfully done.
      redirect_to supplier_articles_path(@supplier), notice: I18n.t('articles.controller.update_all.notice')
    end
  end

  # makes different actions on selected articles
  def update_selected
    raise I18n.t('articles.controller.error_nosel') if params[:selected_articles].nil?

    articles = Article.find(params[:selected_articles])
    Article.transaction do
      case params[:selected_action]
      when 'destroy'
        articles.each(&:mark_as_deleted)
        flash[:notice] = I18n.t('articles.controller.update_sel.notice_destroy')
      when 'setNotAvailable'
        articles.each { |a| a.update_attribute(:availability, false) }
        flash[:notice] = I18n.t('articles.controller.update_sel.notice_unavail')
      when 'setAvailable'
        articles.each { |a| a.update_attribute(:availability, true) }
        flash[:notice] = I18n.t('articles.controller.update_sel.notice_avail')
      else
        flash[:alert] = I18n.t('articles.controller.update_sel.notice_noaction')
      end
    end
    # action succeded
    redirect_to supplier_articles_url(@supplier, per_page: params[:per_page])
  rescue StandardError => e
    redirect_to supplier_articles_url(@supplier, per_page: params[:per_page]),
                alert: I18n.t('errors.general_msg', msg: e)
  end

  # lets start with parsing articles from uploaded file, yeah
  # Renders the upload form
  def upload; end

  # Update articles from a spreadsheet
  def parse_upload
    uploaded_file = params[:articles]['file'] or raise I18n.t('articles.controller.parse_upload.no_file')
    options = { filename: uploaded_file.original_filename }
    options[:outlist_absent] = (params[:articles]['outlist_absent'] == '1')
    options[:convert_units] = (params[:articles]['convert_units'] == '1')
    @updated_article_pairs, @outlisted_articles, @new_articles = @supplier.sync_from_file uploaded_file.tempfile,
                                                                                          options
    if @updated_article_pairs.empty? && @outlisted_articles.empty? && @new_articles.empty?
      redirect_to supplier_articles_path(@supplier),
                  notice: I18n.t('articles.controller.parse_upload.notice')
    end
    @ignored_article_count = 0
  rescue StandardError => e
    redirect_to upload_supplier_articles_path(@supplier), alert: I18n.t('errors.general_msg', msg: e.message)
  end

  # sync all articles with the external database
  # renders a form with articles, which should be updated
  def sync
    # check if there is an shared_supplier
    unless @supplier.shared_supplier
      redirect_to supplier_articles_url(@supplier),
                  alert: I18n.t('articles.controller.sync.shared_alert', supplier: @supplier.name)
    end
    # sync articles against external database
    @updated_article_pairs, @outlisted_articles, @new_articles = @supplier.sync_all
    return unless @updated_article_pairs.empty? && @outlisted_articles.empty? && @new_articles.empty?

    redirect_to supplier_articles_path(@supplier), notice: I18n.t('articles.controller.sync.notice')
  end

  # Updates, deletes articles when upload or sync form is submitted
  def update_synchronized
    @outlisted_articles = Article.find(params[:outlisted_articles].try(:keys) || [])
    @updated_articles = Article.find(params[:articles].try(:keys) || [])
    @updated_articles.map { |a| a.assign_attributes(params[:articles][a.id.to_s]) }
    @new_articles = (params[:new_articles] || []).map { |a| @supplier.articles.build(a) }

    has_error = false
    Article.transaction do
      # delete articles
      begin
        @outlisted_articles.each(&:mark_as_deleted)
      rescue StandardError
        # raises an exception when used in current order
        has_error = true
      end
      # Update articles
      @updated_articles.each { |a| a.save or has_error = true }
      # Add new articles
      @new_articles.each { |a| a.save or has_error = true }

      raise ActiveRecord::Rollback if has_error
    end

    if has_error
      @updated_article_pairs = @updated_articles.map do |article|
        orig_article = Article.find(article.id)
        [article, orig_article.unequal_attributes(article)]
      end
      flash.now.alert = I18n.t('articles.controller.error_invalid')
      render params[:from_action] == 'sync' ? :sync : :parse_upload
    else
      redirect_to supplier_articles_path(@supplier), notice: I18n.t('articles.controller.update_sync.notice')
    end
  end

  # renders a view to import articles in local database
  #
  def shared
    # build array of keywords, required for ransack _all suffix
    q = params.fetch(:q, {})
    q[:name_cont_all] = params.fetch(:name_cont_all_joined, '').split(' ')
    search = @supplier.shared_supplier.shared_articles.ransack(q)
    @articles = search.result.page(params[:page]).per(10)
    render layout: false
  end

  # fills a form whith values of the selected shared_article
  # when the direct parameter is set and the article is valid, it is imported directly
  def import
    @article = SharedArticle.find(params[:shared_article_id]).build_new_article(@supplier)
    @article.article_category_id = params[:article_category_id] if params[:article_category_id].present?
    if params[:direct] && params[:article_category_id].present? && @article.valid? && @article.save
      render action: 'create', layout: false
    else
      render action: 'new', layout: false
    end
  end

  private

  # @return [Number] Number of articles not taken into account when syncing (having no number)
  def ignored_article_count
    if action_name == 'sync' || params[:from_action] == 'sync'
      @ignored_article_count ||= @supplier.articles.undeleted.where(order_number: [nil, '']).count
    else
      0
    end
  end
  helper_method :ignored_article_count
end