module SettingsHelper
  def field(form, key, opts = {})
    html = '<div class="form-group">'

    field_resolver(form.object.column_type(key), html, form, key, opts)

    html << "</div>"
    html.html_safe
  end

  private
  def field_resolver(type, html, form, key, opts)
    case type
    when :hidden
      html << form.hidden_field(key)
    when :boolean, :flag
      boolean_field(html, form, key, opts)
    when :choice
      choice_field(html, form, key, opts)
    when :nested
      nested_field(html, form, key, opts)
    else
      other_field(html, form, key, opts)
    end
  end

  def nested_field(html, form, key, opts = {})
    child_data = form.object.class.children[key]
    klass = child_data[:class]
    options = child_data[:options]
    children = form.object.send(key) || {"0" => {}}
    children.each_pair do |index, child|
      html << %Q!<div class="js-nested-column #{options[:multiple] ? "js-multiple" : ""} well well-sm">!
      if options[:multiple]
        html << %Q!<a class="btn btn-xs btn-default js-append">#{icon('fa-plus')}</a> !
        html << %Q!<a class="btn btn-xs btn-default js-remove" style="display:none">#{icon('fa-minus')}</a> !
      end
      html << h(form.label(key))
      form.fields_for("#{key}[#{index}]", klass.new(child)) do |ff|
        klass::KEYS.each do |k|
          html << field(ff, k)
        end
      end
      html << "</div>"
    end
  end

  def choice_field(html, form, key, opts = {})
    html << h(form.label(key))
    html << " " # NOTE: Adding space for padding
    html << form.select(key, form.object.values_of(key), opts)
  end

  def boolean_field(html, form, key, opts = {})
    html << form.check_box(key, {}, "true", "false")
    html << " " # NOTE: Adding space for padding
    html << h(form.label(key))
  end

  def other_field(html, form, key, opts = {})
    html << h(form.label(key))
    html << form.text_field(key, class: "form-control")
  end
end