package io.dolby.sdk.comms.reactnative.state

import com.voxeet.sdk.services.presentation.file.FilePresentation

/**
 * [FilePresentationHolder] is started file presentations data store.
 * File presentation is stored when file presentation started, updated when corresponding event occur and removed when stopped.
 */
class FilePresentationHolder {

  private val presentationOwners = mutableMapOf<String, String>()
  private val presentations = mutableMapOf<String, FilePresentation>()

  /**
   * Store [FilePresentation] information for specific conference
   *
   * @param conferenceId conference id to store file presentation information
   * @param ownerId participant who started a file presentation
   * @param presentation file presentation information which started
   */
  fun onStarted(conferenceId: String, ownerId: String, presentation: FilePresentation) {
    presentationOwners[conferenceId] = ownerId
    presentations[conferenceId] = presentation
  }

  /**
   * Update [FilePresentation] page for specific conference
   *
   * @param conferenceId conference id to update file presentation information
   * @param position new file presentation position
   * @return updated [FilePresentation] object if exist
   */
  fun onSeek(conferenceId: String, position: Int): FilePresentation? {
    return presentations[conferenceId]?.let {
      it.page = position
      it
    }
  }

  /**
   * Remove [FilePresentation] for specific conference
   *
   * @param conferenceId conference id to remove file presentation information
   * @return removed [FilePresentation] object if exist
   */
  fun onStopped(conferenceId: String): FilePresentation? {
    presentationOwners.remove(conferenceId)
    return presentations.remove(conferenceId)
  }

  /**
   * Get [FilePresentation] information for specific conference.
   *
   * @param conferenceId conference id to get file presentation information
   */
  fun getOwnerId(conferenceId: String): String? = presentationOwners[conferenceId]

  /**
   * Get file presentation owner id from specific conference.
   *
   * @param conferenceId conference id to get file presentation owner id
   */
  fun getPresentation(conferenceId: String): FilePresentation? = presentations[conferenceId]

}