18F/C2

class ProposalFieldedSearchQuery
  attr_reader :field_pairs

  def initialize(field_pairs)
    @field_pairs = field_pairs
  end

  def present?
    return false unless field_pairs
    to_s.present?
  end

  def value_for(key)
    if field_pairs && field_pairs.key?(key)
      field_pairs[key]
    end
  end

  def to_s
    clauses = []
    if field_pairs
      field_pairs.each do |k, v|
        next if v.nil?
        next if v.blank?
        next if v == "*"
        clauses << clause_to_s(k, v)
      end
    end
    clauses.join(" ")
  end

  def to_h
    hash = {}
    if field_pairs
      field_pairs.each do |k, v|
        next if v.nil?
        next if v.blank?
        next if v == "*"
        hash[k] = v
      end
    end
    hash
  end

  def humanized(client_model)
    humanized = {}
    to_h.each do |k, v|
      if k.match(/^client_data\./)
        attr = k.match(/^client_data\.(.+)/)[1]
        humanized[client_model.human_attribute_name(attr)] = v
      else
        humanized[Proposal.human_attribute_name(k)] = v
      end
    end
    self.class.new(humanized)
  end

  private

  def clause_to_s(key, value)
    if value.to_s.match(/^\w/)
      "#{key}:(#{value})"
    else
      "#{key}:#{value}"
    end
  end
end