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module OsLib_QAQC
  # include any general notes about QAQC method here

  # checks the number of unmet hours in the model
  def check_weather_files(category, options, name_only = false)
    # summary of the check
    check_elems = OpenStudio::AttributeVector.new
    check_elems << OpenStudio::Attribute.new('name', 'Weather Files')
    check_elems << OpenStudio::Attribute.new('category', category)
    check_elems << OpenStudio::Attribute.new('description', "Check weather file, design days, and climate zone against #{@utility_name} list of allowable options.")

    # stop here if only name is requested this is used to populate display name for arguments
    if name_only == true
      results = []
      check_elems.each do |elem|
        results << elem.valueAsString
      end
      return results
    end

    begin
      # get weather file
      model_epw = nil
      if @model.getWeatherFile.url.is_initialized
        raw_epw = @model.getWeatherFile.url.get
        end_path_index = raw_epw.rindex('/')
        model_epw = raw_epw.slice!(end_path_index + 1, raw_epw.length) # everything right of last forward slash
      end

      # check design days (model must have one or more of the required summer and winter design days)
      # get design days names from model
      model_summer_dd_names = []
      model_winter_dd_names = []
      @model.getDesignDays.each do |design_day|
        if design_day.dayType == 'SummerDesignDay'
          model_summer_dd_names << design_day.name.to_s
        elsif design_day.dayType == 'WinterDesignDay'
          model_winter_dd_names << design_day.name.to_s
        else
          puts "unexpected day type of #{design_day.dayType} wont' be included in check"
        end
      end

      # find matching weather file from options, as well as design days and climate zone
      if options.key?(model_epw)
        required_summer_dd = options[model_epw]['summer']
        required_winter_dd = options[model_epw]['winter']
        valid_climate_zones = [options[model_epw]['climate_zone']]

        # check for intersection betwen model valid design days
        summer_intersection = (required_summer_dd & model_summer_dd_names)
        winter_intersection = (required_winter_dd & model_winter_dd_names)
        if summer_intersection.empty? && !required_summer_dd.empty?
          check_elems << OpenStudio::Attribute.new('flag', "Didn't find any of the expected summer design days for #{model_epw}")
        end
        if winter_intersection.empty? && !required_winter_dd.empty?
          check_elems << OpenStudio::Attribute.new('flag', "Didn't find any of the expected winter design days for #{model_epw}")
        end

      else
        check_elems << OpenStudio::Attribute.new('flag', "#{model_epw} is not a an expected weather file.")
        check_elems << OpenStudio::Attribute.new('flag', "Model doesn't have expected epw file, as a result can't validate design days.")
        valid_climate_zones = []
        options.each do |lookup_epw, value|
          valid_climate_zones << value['climate_zone']
        end
      end

      # get ashrae climate zone from model
      model_climate_zone = nil
      climateZones = @model.getClimateZones
      climateZones.climateZones.each do |climateZone|
        if climateZone.institution == 'ASHRAE'
          model_climate_zone = climateZone.value
          next
        end
      end
      if model_climate_zone == ''
        check_elems << OpenStudio::Attribute.new('flag', "The model's ASHRAE climate zone has not been defined. Expected climate zone was #{valid_climate_zones.uniq.join(',')}.")
      elsif !valid_climate_zones.include?(model_climate_zone)
        check_elems << OpenStudio::Attribute.new('flag', "The model's ASHRAE climate zone was #{model_climate_zone}. Expected climate zone was #{valid_climate_zones.uniq.join(',')}.")
      end
    rescue StandardError => e
      # brief description of ruby error
      check_elems << OpenStudio::Attribute.new('flag', "Error prevented QAQC check from running (#{e}).")

      # backtrace of ruby error for diagnostic use
      if @error_backtrace then check_elems << OpenStudio::Attribute.new('flag', e.backtrace.join("\n").to_s) end
    end

    # add check_elms to new attribute
    check_elem = OpenStudio::Attribute.new('check', check_elems)

    return check_elem
    # note: registerWarning and registerValue will be added for checks downstream using os_lib_reporting_qaqc.rb
  end
end