class CalculatorController < ApplicationController

  def index

  end

  def calculate
    input = params[:input]
    output_unit = params[:output_unit]
    parsed_input = nil
    original_number = nil

    data = {errors: {}, output: ''}

    if input.present?

      begin
        parsed_input = UnitConversion.parse(input)
        original_number = parsed_input.value
      rescue UnitConversion::UnparseableUnitError => e
        data[:errors][:input] = [e.message]
      end

      if parsed_input.present? && output_unit.present?
        begin
          parsed_input = parsed_input.convert_to output_unit
        rescue Unitwise::ExpressionError => e
          data[:errors][:output_unit] = [e.message]
        end
      end

      if parsed_input
        puts parsed_input.value
        puts parsed_input.unit
        data[:output] = UnitConversion.auto_unit(UnitConversion.quantity_format(parsed_input.value, original_number), parsed_input.unit.to_s)
      end

    else
      data[:errors][:input] = ['Invalid input']
    end

    render json: data
  end

end