import { describe, it, expect } from 'vitest';

describe('AdminService', () => {
  describe('getDashboardStats', () => {
    describe('happy paths', () => {
      it('should return dashboard statistics successfully', () => {
        // TODO: Implement test
      });
    });

    describe('failure modes', () => {
      it('should handle API errors when fetching dashboard stats', () => {
        // TODO: Implement test
      });

      it('should handle network errors', () => {
        // TODO: Implement test
      });
    });

    describe('retries', () => {
      it('should retry on transient API failures', () => {
        // TODO: Implement test
      });
    });

    describe('fallback logic', () => {
      it('should use fallback data when API is unavailable', () => {
        // TODO: Implement test
      });
    });

    describe('aggregation logic', () => {
      it('should aggregate user statistics correctly', () => {
        // TODO: Implement test
      });

      it('should calculate growth metrics accurately', () => {
        // TODO: Implement test
      });
    });

    describe('decision branches', () => {
      it('should handle different user role distributions', () => {
        // TODO: Implement test
      });

      it('should handle empty or missing data gracefully', () => {
        // TODO: Implement test
      });
    });
  });

  describe('listUsers', () => {
    describe('happy paths', () => {
      it('should return user list successfully', () => {
        // TODO: Implement test
      });

      it('should handle pagination parameters', () => {
        // TODO: Implement test
      });
    });

    describe('failure modes', () => {
      it('should handle API errors when listing users', () => {
        // TODO: Implement test
      });

      it('should handle invalid pagination parameters', () => {
        // TODO: Implement test
      });
    });

    describe('retries', () => {
      it('should retry on transient API failures', () => {
        // TODO: Implement test
      });
    });

    describe('fallback logic', () => {
      it('should use fallback data when API is unavailable', () => {
        // TODO: Implement test
      });
    });

    describe('aggregation logic', () => {
      it('should aggregate user data correctly', () => {
        // TODO: Implement test
      });

      it('should calculate total pages correctly', () => {
        // TODO: Implement test
      });
    });

    describe('decision branches', () => {
      it('should handle different user statuses', () => {
        // TODO: Implement test
      });

      it('should handle empty user lists', () => {
        // TODO: Implement test
      });

      it('should handle system admin users differently', () => {
        // TODO: Implement test
      });
    });
  });

  describe('updateUserStatus', () => {
    describe('happy paths', () => {
      it('should update user status successfully', () => {
        // TODO: Implement test
      });

      it('should handle different status values', () => {
        // TODO: Implement test
      });
    });

    describe('failure modes', () => {
      it('should handle API errors when updating status', () => {
        // TODO: Implement test
      });

      it('should handle invalid user IDs', () => {
        // TODO: Implement test
      });

      it('should handle invalid status values', () => {
        // TODO: Implement test
      });
    });

    describe('retries', () => {
      it('should retry on transient API failures', () => {
        // TODO: Implement test
      });
    });

    describe('fallback logic', () => {
      it('should use fallback data when API is unavailable', () => {
        // TODO: Implement test
      });
    });

    describe('aggregation logic', () => {
      it('should update user data in response correctly', () => {
        // TODO: Implement test
      });
    });

    describe('decision branches', () => {
      it('should handle status transitions correctly', () => {
        // TODO: Implement test
      });

      it('should prevent invalid status transitions', () => {
        // TODO: Implement test
      });

      it('should handle system admin status updates', () => {
        // TODO: Implement test
      });
    });
  });

  describe('deleteUser', () => {
    describe('happy paths', () => {
      it('should delete user successfully', () => {
        // TODO: Implement test
      });

      it('should perform soft delete', () => {
        // TODO: Implement test
      });
    });

    describe('failure modes', () => {
      it('should handle API errors when deleting user', () => {
        // TODO: Implement test
      });

      it('should handle non-existent user IDs', () => {
        // TODO: Implement test
      });

      it('should prevent deletion of system admins', () => {
        // TODO: Implement test
      });
    });

    describe('retries', () => {
      it('should retry on transient API failures', () => {
        // TODO: Implement test
      });
    });

    describe('fallback logic', () => {
      it('should use fallback data when API is unavailable', () => {
        // TODO: Implement test
      });
    });

    describe('aggregation logic', () => {
      it('should update user list aggregation after deletion', () => {
        // TODO: Implement test
      });
    });

    describe('decision branches', () => {
      it('should handle different user roles during deletion', () => {
        // TODO: Implement test
      });

      it('should handle cascading deletions', () => {
        // TODO: Implement test
      });

      it('should handle deletion of users with active sessions', () => {
        // TODO: Implement test
      });
    });
  });
});