"""
virst compatibility module for managing VMs on SmartOS
"""

import logging

import salt.utils.path
import salt.utils.platform
from salt.exceptions import CommandExecutionError

log = logging.getLogger(__name__)

# Define the module's virtual name
__virtualname__ = "virt"


def __virtual__():
    """
    Provides virt on SmartOS
    """
    if salt.utils.platform.is_smartos_globalzone() and salt.utils.path.which("vmadm"):
        return __virtualname__
    return (
        False,
        "{} module can only be loaded on SmartOS compute nodes".format(__virtualname__),
    )


def init(**kwargs):
    """
    Initialize a new VM

    CLI Example:

    .. code-block:: bash

        salt '*' virt.init image_uuid='...' alias='...' [...]
    """
    return __salt__["vmadm.create"](**kwargs)


def list_domains():
    """
    Return a list of virtual machine names on the minion

    CLI Example:

    .. code-block:: bash

        salt '*' virt.list_domains
    """
    data = __salt__["vmadm.list"](keyed=True)
    vms = [
        "UUID                                  TYPE  RAM      STATE             ALIAS"
    ]
    for vm in data:
        vms.append(
            "{vmuuid}{vmtype}{vmram}{vmstate}{vmalias}".format(
                vmuuid=vm.ljust(38),
                vmtype=data[vm]["type"].ljust(6),
                vmram=data[vm]["ram"].ljust(9),
                vmstate=data[vm]["state"].ljust(18),
                vmalias=data[vm]["alias"],
            )
        )
    return vms


def list_active_vms():
    """
    Return a list of uuids for active virtual machine on the minion

    CLI Example:

    .. code-block:: bash

        salt '*' virt.list_active_vms
    """
    return __salt__["vmadm.list"](search="state='running'", order="uuid")


def list_inactive_vms():
    """
    Return a list of uuids for inactive virtual machine on the minion

    CLI Example:

    .. code-block:: bash

        salt '*' virt.list_inactive_vms
    """
    return __salt__["vmadm.list"](search="state='stopped'", order="uuid")


def vm_info(domain):
    """
    Return a dict with information about the specified VM on this CN

    CLI Example:

    .. code-block:: bash

        salt '*' virt.vm_info <domain>
    """
    return __salt__["vmadm.get"](domain)


def start(domain):
    """
    Start a defined domain

    CLI Example:

    .. code-block:: bash

        salt '*' virt.start <domain>
    """
    if domain in list_active_vms():
        raise CommandExecutionError("The specified vm is already running")

    __salt__["vmadm.start"](domain)

    return domain in list_active_vms()


def shutdown(domain):
    """
    Send a soft shutdown signal to the named vm

    CLI Example:

    .. code-block:: bash

        salt '*' virt.shutdown <domain>
    """
    if domain in list_inactive_vms():
        raise CommandExecutionError("The specified vm is already stopped")

    __salt__["vmadm.stop"](domain)

    return domain in list_inactive_vms()


def reboot(domain):
    """
    Reboot a domain via ACPI request

    CLI Example:

    .. code-block:: bash

        salt '*' virt.reboot <domain>
    """
    if domain in list_inactive_vms():
        raise CommandExecutionError("The specified vm is stopped")

    __salt__["vmadm.reboot"](domain)

    return domain in list_active_vms()


def stop(domain):
    """
    Hard power down the virtual machine, this is equivalent to powering off the hardware.

    CLI Example:

    .. code-block:: bash

        salt '*' virt.destroy <domain>
    """
    if domain in list_inactive_vms():
        raise CommandExecutionError("The specified vm is stopped")

    return __salt__["vmadm.delete"](domain)


def vm_virt_type(domain):
    """
    Return VM virtualization type : OS or KVM

    CLI Example:

    .. code-block:: bash

        salt '*' virt.vm_virt_type <domain>
    """
    ret = __salt__["vmadm.lookup"](
        search="uuid={uuid}".format(uuid=domain), order="type"
    )
    if len(ret) < 1:
        raise CommandExecutionError("We can't determine the type of this VM")

    return ret[0]["type"]


def setmem(domain, memory):
    """
    Change the amount of memory allocated to VM.
    <memory> is to be specified in MB.

    Note for KVM : this would require a restart of the VM.

    CLI Example:

    .. code-block:: bash

        salt '*' virt.setmem <domain> 512
    """
    vmtype = vm_virt_type(domain)
    if vmtype == "OS":
        return __salt__["vmadm.update"](vm=domain, max_physical_memory=memory)
    elif vmtype == "LX":
        return __salt__["vmadm.update"](vm=domain, max_physical_memory=memory)
    elif vmtype == "KVM":
        log.warning("Changes will be applied after the VM restart.")
        return __salt__["vmadm.update"](vm=domain, ram=memory)
    else:
        raise CommandExecutionError("Unknown VM type")

    return False


def get_macs(domain):
    """
    Return a list off MAC addresses from the named VM

    CLI Example:

    .. code-block:: bash

        salt '*' virt.get_macs <domain>
    """
    macs = []
    ret = __salt__["vmadm.lookup"](
        search="uuid={uuid}".format(uuid=domain), order="nics"
    )
    if len(ret) < 1:
        raise CommandExecutionError("We can't find the MAC address of this VM")
    else:
        for nic in ret[0]["nics"]:
            macs.append(nic["mac"])
        return macs
