class CountsExportsController < ApplicationController
  wrap_parameters false

  def index
    locale = resolve_locale!
    payload = request.request_parameters.except('authenticity_token')
        .merge(request.query_parameters)
    exporter = CountsExporter.new(payload,
                                  language_code: locale.language_code)
    response.headers['Content-Type'] = exporter.format == 'json' ?
        'application/json; charset=utf-8' : 'text/csv; charset=utf-8'
    response.headers['Content-Disposition'] =
        "attachment; filename=\"counts-#{ exporter.resource }.#{ exporter.format }\""
    response.headers['Cache-Control'] = 'private, no-store'
    response.headers['X-Accel-Buffering'] = 'no'
    # Rack::ETag otherwise materialises the response to calculate a digest.
    response.headers['Last-Modified'] = Time.current.httpdate
    self.response_body = exporter.body
  rescue ArgumentError, TypeError, KeyError, JSON::ParserError
    head :bad_request
  end
end