package eventDemo.app.command

import eventDemo.app.command.command.GameCommand
import eventDemo.app.entity.Player
import eventDemo.app.event.event.GameEvent
import eventDemo.app.notification.Notification
import eventDemo.libs.command.CommandStreamChannelBuilder
import io.github.oshai.kotlinlogging.KotlinLogging
import kotlinx.coroutines.channels.ReceiveChannel
import kotlinx.coroutines.channels.SendChannel

/**
 * Listen [GameCommand] on [GameCommandStream], check the validity and execute an action.
 *
 * This action can be executing an action and produce a new [GameEvent] after verification.
 */
class GameCommandHandler(
  private val commandStreamChannel: CommandStreamChannelBuilder<GameCommand>,
  private val runner: GameCommandRunner,
) {
  private val logger = KotlinLogging.logger { }

  /**
   * Init the handler
   */
  suspend fun handle(
    player: Player,
    incomingCommandChannel: ReceiveChannel<GameCommand>,
    outgoingErrorChannelNotification: SendChannel<Notification>,
  ) =
    commandStreamChannel(incomingCommandChannel)
      .process { command ->
        if (command.payload.player.id != player.id) {
          logger.atWarn {
            message = "Handle command Refuse, the player of the command is not the same: $command"
            payload = mapOf("command" to command)
          }
          nack()
        } else {
          logger.atInfo {
            message = "Handle command: $command"
            payload = mapOf("command" to command)
          }
          runner.run(command, outgoingErrorChannelNotification)
        }
      }
}