package de.ph87.tools.group.access;

import de.ph87.tools.group.Group;
import de.ph87.tools.group.GroupRepository;
import de.ph87.tools.group.uuid.GroupUuid;
import de.ph87.tools.user.User;
import de.ph87.tools.user.UserAccessService;
import de.ph87.tools.user.uuid.UserPrivateUuid;
import jakarta.annotation.Nullable;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.server.ResponseStatusException;

@Slf4j
@Service
@Transactional
@RequiredArgsConstructor
public class GroupAccessService {

  private final GroupRepository groupRepository;

  private final UserAccessService userAccessService;

  public boolean canAccess(@Nullable final UserPrivateUuid userPrivateUuid, @NonNull final GroupUuid groupUuid) {
    final User user = userAccessService.accessOrNull(userPrivateUuid);
    if (user == null) {
      return false;
    }
    final Group group = getByUuidOrThrow(groupUuid);
    return group.getUsers().contains(user);
  }

  @NonNull
  public GroupAccess access(@NonNull final UserPrivateUuid userPrivateUuid, @NonNull final GroupUuid groupUuid) {
    final User user = userAccessService.access(userPrivateUuid);
    final Group group = getByUuidOrThrow(groupUuid);
    return new GroupAccess(user, group);
  }

  @NonNull
  public GroupAccess ownerAccess(@NonNull final UserPrivateUuid userPrivateUuid, @NonNull final GroupUuid groupUuid) {
    final GroupAccess groupAccess = access(userPrivateUuid, groupUuid);
    if (!groupAccess.group.isOwnedBy(groupAccess.principal)) {
      throw new ResponseStatusException(HttpStatus.BAD_REQUEST);
    }
    return groupAccess;
  }

  @NonNull
  private Group getByUuidOrThrow(@NonNull final GroupUuid groupUuid) {
    return groupRepository.findByUuid(groupUuid.uuid).orElseThrow(() -> new ResponseStatusException(HttpStatus.BAD_REQUEST));
  }

}