POS-Server/app/controllers/pre_sales_controller.rb

class PreSalesController < ApplicationController
  before_action :set_pre_sale, only: [:show, :edit, :update, :destroy]

  # POST /pre_sales
  # POST /pre_sales.json
  def create
    @pre_sale = PreSale.find_by(product_id: params[:pre_sale][:product_id], user_id: current_user.id)
    if @pre_sale.present? # si ya existe un pre sale con ese producto
      @pre_sale.quantity += 1
    else
      @is_new = true
      @pre_sale = PreSale.new(pre_sale_params)
      @pre_sale.user_id = current_user.id
    end

    total_in_pre_sales = PreSale.where(user_id: @pre_sale.user_id).sum(:total)

    #precio unitario
    @pre_sale.unit_price = @pre_sale.product.get_price_sale(OpenCashRegister.find(@pre_sale.open_cash_register_id).pointsale.id)
    @pre_sale.get_totals
    total_in_pre_sales += @pre_sale.total

    respond_to do |format|
      if has_enough_stock?(@pre_sale)
        #cuando la venta es a credito checar que el credito permita esta nueva venta
        case @pre_sale.sale_type
        when "credit" then
          debiting = @pre_sale.customer.get_debiting
          if @pre_sale.customer.sale_approved?(debiting + total_in_pre_sales) && @pre_sale.save
            format.js
          else
            @pre_sale.errors.add(:customer_id, "El cliente ya no tiene crédito disponible.")
            format.json { render json: @pre_sale.errors.values, status: :unprocessable_entity }
            format.js
          end
        when "cash", "reserved" then
          if @pre_sale.save
            format.js
          else
            format.json { render json: @pre_sale.errors.values, status: :unprocessable_entity }
          end
        end
      else
        @pre_sale.errors.add(:base, "Stock insuficiente del producto #{@pre_sale.product.name}")
        format.json { render json: @pre_sale.errors.values, status: :unprocessable_entity }
        format.js
      end
    end
  end

  # PATCH/PUT /pre_sales/1
  # PATCH/PUT /pre_sales/1.json
  def update
    dup_presale = @pre_sale.dup
    @pre_sale.quantity = params[:pre_sale][:quantity].to_i
    availableProduct = AvailableProduct.find_by(pointsale_id: current_user.pointsale_id, product_id: @pre_sale.product_id)
    total_in_pre_sales = PreSale.where(user_id: current_user.id, product_id: @pre_sale.product_id).where.not(id: @pre_sale.id).sum(:total)

    respond_to do |format|
      if availableProduct.stock >= @pre_sale.quantity
        @pre_sale.get_totals
        total_in_pre_sales += @pre_sale.total
        case @pre_sale.sale_type
        when "credit" then
          if @pre_sale.customer.sale_approved?(@pre_sale.customer.get_debiting + total_in_pre_sales)
            @pre_sale.update(pre_sale_params)
            format.json { render json: @pre_sale }
          else
            @pre_sale.errors.add(:base, "El cliente ya no tiene crédito disponible")
            format.json { render json: { errors: @pre_sale.errors.values, presale: dup_presale, quantity: dup_presale.quantity }, status: :unprocessable_entity }
          end
        when "cash", "reserved" then
          @pre_sale.update(pre_sale_params)
          format.json { render json: @pre_sale }
        end
      else
        @pre_sale.errors.add(:base, "Stock insuficiente del producto #{@pre_sale.product.name}")
        format.json { render json: { errors: @pre_sale.errors.values, presale: dup_presale, quantity: dup_presale.quantity }, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /pre_sales/1
  # DELETE /pre_sales/1.json
  def destroy
    respond_to do |format|
      if @pre_sale.destroy
        format.json { head :ok }
      end
    end
  end

  def add_pre_sale_by_barcode
    total_in_pre_sales = 0
    pointsale = OpenCashRegister.get_pointsale(params[:open_cash_register_id], "open_cash_register")
    @product = pointsale.products.find_by("barcode = ? and stock > 0", params[:barcode])
    respond_to do |format|
      if @product.blank?
        @pre_sale = PreSale.new
        @pre_sale.errors.add(:product_id, "No se encontro el producto")
        format.js { render action: "create" }
      else
        total_in_pre_sales = PreSale.where(user_id: current_user.id).sum(:total)
        @pre_sale = PreSale.new(customer_id: params[:customer_id], user_id: current_user.id, open_cash_register_id: params[:open_cash_register_id], product_id: @product.id, sale_type: params[:sale_type], quantity: 1)

        #precio unitario
        @pre_sale.unit_price = @pre_sale.product.get_price_sale(OpenCashRegister.find(@pre_sale.open_cash_register_id).pointsale.id)
        @pre_sale.get_totals
        total_in_pre_sales += @pre_sale.total

        #cuando la venta es a credito checar que el credito permita esta nueva venta
        if has_enough_stock?(@pre_sale)
          @is_new = true if @pre_sale.quantity == 1
          #cuando la venta es a credito checar que el credito permita esta nueva venta
          case @pre_sale.sale_type
          when "credit" then
            debiting = @pre_sale.customer.get_debiting
            if @pre_sale.customer.sale_approved?(debiting + total_in_pre_sales) && @pre_sale.save
              format.js { render action: "create" }
            else
              @pre_sale.errors.add(:customer_id, "El cliente ya no tiene crédito disponible.")
              format.json { render json: @pre_sale.errors.values, status: :unprocessable_entity }
              format.js
            end
          when "cash", "reserved" then
            if @pre_sale.save
              format.js { render action: "create" }
            else
              format.json { render json: @pre_sale.errors.values, status: :unprocessable_entity }
            end
          end
        else
          @pre_sale.errors.add(:base, "Stock insuficiente del producto #{@pre_sale.product.name}")
          format.json { render json: @pre_sale.errors.values, status: :unprocessable_entity }
          format.js { render action: "create" }
        end
      end
    end
  end

  def update_presale_customer
    @pre_sales = PreSale.where(user_id: current_user.id)
    @pre_sales.update_all(customer_id: params[:customer_id], sale_type: 1) if @pre_sales.present?
    respond_to do |format|
      format.json { head :ok }
    end
  end

  def update_saletype
    pre_sales = PreSale.where(user_id: current_user.id)
    type =
      case params[:type]
      when "credit" then
        0
      when "cash" then
        1
      when "reserved" then
        3
      end

    respond_to do |format|
      if pre_sales.blank?
        format.json { head :ok }
      else
        if params[:type] != "credit" || pre_sales[0].customer.sale_approved?(pre_sales[0].customer.get_debiting + pre_sales.sum(:total))
          pre_sales.update_all(sale_type: type)
          format.json { head :ok }
        else
          pre_sales[0].errors.add(:base, "El cliente ya no tiene crédito disponible")
          format.json { render json: pre_sales[0].errors.values, status: :unprocessable_entity }
        end
      end
    end
  end

  private
  # Use callbacks to share common setup or constraints between actions.
  def set_pre_sale
    @pre_sale = PreSale.find(params[:id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def pre_sale_params
    params.require(:pre_sale).permit(:customer_id, :user_id, :open_cash_register_id, :sale_type, :product_id, :quantity, :amount, :tax, :discount, :total, :barcode, :haggle)
  end

  def has_enough_stock?(pre_sale)
    availableProduct = AvailableProduct.find_by(pointsale_id: current_user.pointsale_id, product_id: pre_sale.product_id)
    if availableProduct.stock >= pre_sale.quantity
      return true
    else
      return false
    end
  end
end