class GameController < ApplicationController
  def finish_activity
    @results = []
    return unless current_char.activity_time_remaining <= 0
    activity = current_char.activity

    return unless current_char.can_do_activity?(activity) # TODO: Add error message
    current_char.update(activity_started_at: Time.now)

    Character.transaction do
      current_char.pay_cost_for(activity)

      activity.whatnot[:results].each do |result|
        type = result[:type]
        case type
        when "item"
          next if rand > (result[:chance] || 1)

          if result[:table]
            table_roll = rand

            result[:table].sort_by { |t| -t[:score] }.each do |table_entry|
              quantity = table_entry[:quantity] || 1

              score = table_entry[:score]
              table_scaling = result[:table_scaling]
              table_scaling&.each do |scale_entry|
                case scale_entry[:type]
                when "skill"
                  score = score**(1 + (scale_entry[:scale_value] * current_char.skill_level(scale_entry[:gid])))
                end
              end

              if table_roll >= score
                give_item_with_xp(table_entry, quantity)
                break
              end
            end
          else
            quantity = result[:quantity] || 1
            give_item_with_xp(result, quantity)
          end
        when "hearth_amenity"
          bhi = current_char.hearth.built_hearth_amenities
                            .find_or_initialize_by(hearth_amenity: HearthAmenity.find_by_gid(result[:gid]))
          bhi.update(level: result[:level])
          @results.push({ type: type, hearth_amenity: bhi.hearth_amenity })
        when "activity"
          next if rand > (result[:chance] || 1)
          table_roll = rand
          result[:table].sort_by { |t| -t[:score] }.each do |table_entry|
            score = table_entry[:score]
            result[:table_scaling]&.each do |scale_entry|
              case scale_entry[:type]
              when "skill"
                score = score**(1 + (scale_entry[:scale_value] * current_char.skill_level(scale_entry[:gid])))
              end
            end
            if table_roll >= score
              activity = Activity.find_by_gid(table_entry[:gid])
              unless current_char.learned_activities.exists?(activity: activity)
                current_char.learned_activities.create(activity: activity)
                @results.push({ type: type, activity: activity })
              end
            end
          end
        else
          raise "Invalid result type (#{type})" # TODO: Improve this.
        end
      end
    end
  rescue ItemQuantityError
    @results.replace({ type: "error", message: "You don't have enough items to complete this activity." })
  end

  private
    def give_item_with_xp(data, quantity)
      item = Item.find_by_gid(data[:gid])
      xp_awards = data[:xp]&.map { |xpe| { skill: Skill.find_by_gid(xpe[:gid]), amount: xpe[:value] } }
      xp_awards&.each do |award|
        current_char.add_skill_xp(award[:skill], (award[:amount] * quantity))
      end
      current_char.shift_item(item, quantity)
      @results.push({ type: "item", item: item, quantity: quantity, xp: xp_awards })
    end
end