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/*
 * Copyright 2020 Scala EventStoreDB Client
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package sec
package api
package cluster

import cats.Applicative
import cats.syntax.all.*
import cats.effect.Sync
import com.comcast.ip4s.*

private[sec] trait EndpointResolver[F[_]]:
  def resolveEndpoints(host: Hostname, nodePort: Port): F[List[Endpoint]]

private[sec] object EndpointResolver:

  def noop[F[_]: Applicative]: EndpointResolver[F] = new EndpointResolver[F]:
    def resolveEndpoints(host: Hostname, nodePort: Port): F[List[Endpoint]] = List.empty[Endpoint].pure[F]

  def default[F[_]: Sync]: EndpointResolver[F] = new EndpointResolver[F]:

    val dns: Dns[F] = Dns.forSync[F]

    def resolveEndpoints(host: Hostname, nodePort: Port): F[List[Endpoint]] =
      dns.resolveAll(host).map(_.map(ia => Endpoint(ia.toUriString, nodePort.value)))