# frozen_string_literal: true

module RailsMultisite
  class ConnectionManagement
    def self.each_active_connection(&blk)
      if ENV["RAILS_DB"]
        blk.call(current_db)
      else
        each_connection(&blk)
      end
    end

    def self.safe_each_connection
      each_active_connection do |db|
        begin
          yield(db) if block_given?
        rescue PG::ConnectionBad, PG::UnableToSend, PG::ServerError
          break if !defined?(RailsFailover::ActiveRecord)
          break if db == RailsMultisite::ConnectionManagement::DEFAULT

          reading_role = :"#{db}_#{ActiveRecord.reading_role}"
          spec = RailsMultisite::ConnectionManagement.connection_spec(db: db)
          handler = ActiveRecord::Base.connection_handler

          RailsFailover::ActiveRecord.establish_reading_connection(
            handler,
            spec.to_hash,
            role: reading_role,
          )
          ActiveRecord::Base.connected_to(role: reading_role) { yield(db) if block_given? }
        rescue => e
          STDERR.puts "URGENT: Failed to initialize site #{db}: " \
                        "#{e.class} #{e.message}\n#{e.backtrace.join("\n")}"
          # the show must go on, don't stop startup if multisite fails
        end
      end
    end
  end

  class DiscoursePatches
    def self.config
      { db_lookup: lambda { |env| env["PATH_INFO"] == "/srv/status" ? "default" : nil } }
    end
  end
end