from enum import Enum

class VMStatus(Enum):
    # Must be only assigned to brand new VM
    requested_new = "REQUESTED_NEW"

    # Only Assigned to already created vm
    requested_start = "REQUESTED_START"

    # These all are for running vms
    requested_shutdown = "REQUESTED_SHUTDOWN"
    requested_suspend = "REQUESTED_SUSPEND"
    requested_resume = "REQUESTED_RESUME"
    requested_migrate = "REQUESTED_MIGRATE"

    # either its image is not found or user requested
    # to delete it
    deleted = "DELETED"
    
    stopped = "STOPPED" # After requested_shutdown
    killed = "KILLED"  # either host died or vm died itself

    running = "RUNNING"
    suspended = "SUSPENDED"

    running_vm_statuses = [requested_shutdown, requested_suspend,
                           requested_resume, requested_migrate,
                           running, suspended]
class HostStatus(Enum):
    alive = "ALIVE"
    dead = "DEAD"