class PostImportsController < ApplicationController
  before_action :require_member!

  def preview
    source =
        if params[:format] == 'google_sheets'
          PostImportGoogleSheetsFetcher.fetch!(params[:source], rate_key: current_user.id)
        else
          params[:source]
        end
    format = params[:format] == 'google_sheets' ? 'csv' : params[:format]
    parsed = PostImportSourceParser.new(source:, format:,
                                        has_header: params[:has_header], json_path: params[:json_path]).parse
    url_column = params[:url_column].presence || (parsed[:columns].length == 1 ? 0 : nil)
    return render_bad_request('URL 列を選択してください．') if url_column.nil?

    rows = PostImportPreviewer.new(parsed:, url_column:, mappings: params[:mappings],
                                   existing: params[:existing]).preview
    render json: parsed.slice(:columns).merge(rows:)
  rescue ArgumentError => e
    render_bad_request(e.message)
  end

  def create
    render json: PostImportRunner.new(actor: current_user, rows: params[:rows].to_a).run,
           status: :created
  end

  private

  def require_member!
    return head :unauthorized unless current_user
    return if current_user.gte_member?

    head :forbidden
  end
end