module Suppliers
  class ProductsController < Suppliers::ApplicationController
    layout 'tablet'
    after_authentication only: [:show, :edit, :update, :destroy] do
      @product = Product.find_by_supplier_id_and_id!(current_supplier.id, params[:id])
    end

    # GET /products
    # GET /products.json
    def index
      @products = current_supplier.products

      respond_to do |format|
        format.html # index.html.erb
        format.json { render json: @products }
      end
    end

    # GET /products/1
    # GET /products/1.json
    def show
      respond_to do |format|
        format.html # show.html.erb
        format.json { render json: @product }
      end
    end

    # GET /products/new
    # GET /products/new.json
    def new
      @product = Product.new supplier: current_supplier
      @product.add_product_category ProductCategory.find_by_supplier_id_and_id!(current_supplier.id, params[:product_category_id]) if params[:product_category_id].present?

      respond_to do |format|
        format.html # new.html.erb
        format.json { render json: @product }
      end
    end

    # GET /products/1/edit
    def edit
      #@product = Product.find(params[:id])
    end

    # POST /products
    # POST /products.json
    def create
      @product = Product.new(product_params)
      @product.supplier = current_supplier

      respond_to do |format|
        if @product.save
          format.html { redirect_to [:suppliers, :products], notice: t('action.create.successfull', model: Product.model_name.human) }
          format.json { render json: @product, status: :created }
        else
          format.html { render action: "new" }
          format.json { render json: {errors: @product.errors}, status: :unprocessable_entity }
        end
      end
    end

    # PUT /products/1
    # PUT /products/1.json
    def update
      #@product = Product.find_by_supplier_id_and_id!(current_supplier.id, params[:id])

      respond_to do |format|
        if @product.update_attributes(product_params)
          format.html { redirect_to [:suppliers, :products], notice: t('action.update.successfull', model: Product.model_name.human) }
          format.json { render json_response @product }
        else
          format.html { render action: "edit" }
          format.json { render json_response @product }
        end
      end
    end

    # DELETE /products/1
    # DELETE /products/1.json
    def destroy
      @product = Product.find_by_supplier_id_and_id!(current_supplier.id, params[:id])
      @product.destroy
      head :no_content
    end

    def preview_products
      #TODO: time zone correction, since the hour and minute are of the supplier time zone, not the system time zone
      @time = Time.parse("#{params[:date]}T#{params[:hour]}:#{params[:minute]}:00") rescue Time.now
      product_categories = ProductCategory.for_supplier_in_time(current_supplier, @time)
      render json: {categories: product_categories.map(&:to_client_format).select(&:present?)}
    end

    private

    def product_params
      permitted_attributes = [:name, :code, :price, :description, :image, :visible, :position, :active, :product_category_id]
      # do not raise in development and test for json communication
      result = if request.format.json?
        params.require(:product).slice(*permitted_attributes).permit!
      else
        params.require(:product).permit permitted_attributes
      end
      decode_base64_params result, :image
    end

    BASE64_IMAGE_MATCHER = /^data:image\/(\w+);base64,/ # data:image/png;base64,
    # inspired by: https://stackoverflow.com/questions/32984963/upload-base64-encoded-image-with-paperclip-rails
    def decode_base64_params(authorized_params, attributes = [])
      @tempfiles = []
      attributes = Array.wrap(attributes) # allow single attribute argument without array notation
      attributes.each do |attribute|
        if value = authorized_params[attribute].presence
          if value.is_a?(String) and match = value.match(BASE64_IMAGE_MATCHER)
            image_type = match[1]
            decoded_attribute = Base64.decode64 value.sub BASE64_IMAGE_MATCHER, ''
            file = Tempfile.new(['image', ".#{image_type}"])
            @tempfiles << file
            file.binmode
            file.write decoded_attribute
            authorized_params[attribute] = file
          else
            # Will be a <ActionController::Parameters {"small"=>"/system/product/:id/images/small.?1421223999"} permitted: true>
            authorized_params.delete attribute
          end
        end
      end
      authorized_params
    ensure
      @tempfiles.each &:rewind
      # tempfiles.each &:unlink
    end
  end
end