"""
The generic libcloud template used to create the connections and deploy the
cloud virtual machines
"""

import logging
import os

import salt.client
import salt.config
import salt.utils.cloud
import salt.utils.data
import salt.utils.event
from salt.exceptions import SaltCloudNotFound, SaltCloudSystemExit

# pylint: disable=W0611
try:
    import libcloud
    from libcloud.compute.types import Provider, NodeState
    from libcloud.compute.providers import get_driver
    from libcloud.compute.deployment import MultiStepDeployment, ScriptDeployment

    HAS_LIBCLOUD = True
    LIBCLOUD_VERSION_INFO = tuple(
        [
            int(part)
            for part in libcloud.__version__.replace("-", ".")
            .replace("rc", ".")
            .split(".")[:3]
        ]
    )

except ImportError:
    HAS_LIBCLOUD = False
    LIBCLOUD_VERSION_INFO = (1000,)
# pylint: enable=W0611


log = logging.getLogger(__name__)


LIBCLOUD_MINIMAL_VERSION = (1, 5, 0)


def check_libcloud_version(reqver=LIBCLOUD_MINIMAL_VERSION, why=None):
    """
    Compare different libcloud versions
    """
    if not HAS_LIBCLOUD:
        return False

    if not isinstance(reqver, (list, tuple)):
        raise RuntimeError(
            "'reqver' needs to passed as a tuple or list, i.e., (1, 5, 0)"
        )

    if LIBCLOUD_VERSION_INFO >= reqver:
        return libcloud.__version__

    errormsg = "Your version of libcloud is {}. salt-cloud requires >= libcloud {}".format(
        libcloud.__version__, ".".join([str(num) for num in reqver])
    )
    if why:
        errormsg += " for {}".format(why)
    errormsg += ". Please upgrade."
    raise ImportError(errormsg)


def get_node(conn, name):
    """
    Return a libcloud node for the named VM
    """
    nodes = conn.list_nodes()
    for node in nodes:
        if node.name == name:
            __utils__["cloud.cache_node"](
                salt.utils.data.simple_types_filter(node.__dict__),
                __active_provider_name__,
                __opts__,
            )
            return node


def avail_locations(conn=None, call=None):
    """
    Return a dict of all available VM locations on the cloud provider with
    relevant data
    """
    if call == "action":
        raise SaltCloudSystemExit(
            "The avail_locations function must be called with "
            "-f or --function, or with the --list-locations option"
        )

    if not conn:
        conn = get_conn()  # pylint: disable=E0602

    locations = conn.list_locations()
    ret = {}
    for img in locations:
        img_name = str(img.name)

        ret[img_name] = {}
        for attr in dir(img):
            if attr.startswith("_") or attr == "driver":
                continue

            attr_value = getattr(img, attr)
            ret[img_name][attr] = attr_value

    return ret


def avail_images(conn=None, call=None):
    """
    Return a dict of all available VM images on the cloud provider with
    relevant data
    """
    if call == "action":
        raise SaltCloudSystemExit(
            "The avail_images function must be called with "
            "-f or --function, or with the --list-images option"
        )

    if not conn:
        conn = get_conn()  # pylint: disable=E0602

    images = conn.list_images()
    ret = {}
    for img in images:
        img_name = str(img.name)

        ret[img_name] = {}
        for attr in dir(img):
            if attr.startswith("_") or attr in ("driver", "get_uuid"):
                continue
            attr_value = getattr(img, attr)
            ret[img_name][attr] = attr_value
    return ret


def avail_sizes(conn=None, call=None):
    """
    Return a dict of all available VM images on the cloud provider with
    relevant data
    """
    if call == "action":
        raise SaltCloudSystemExit(
            "The avail_sizes function must be called with "
            "-f or --function, or with the --list-sizes option"
        )

    if not conn:
        conn = get_conn()  # pylint: disable=E0602

    sizes = conn.list_sizes()
    ret = {}
    for size in sizes:
        size_name = str(size.name)

        ret[size_name] = {}
        for attr in dir(size):
            if attr.startswith("_") or attr in ("driver", "get_uuid"):
                continue

            try:
                attr_value = getattr(size, attr)
            except Exception:  # pylint: disable=broad-except
                pass

            ret[size_name][attr] = attr_value
    return ret


def get_location(conn, vm_):
    """
    Return the location object to use
    """
    locations = conn.list_locations()
    vm_location = salt.config.get_cloud_config_value("location", vm_, __opts__)
    for img in locations:
        img_id = str(img.id)
        img_name = str(img.name)

        if vm_location and vm_location in (img_id, img_name):
            return img

    raise SaltCloudNotFound(
        "The specified location, '{}', could not be found.".format(vm_location)
    )


def get_image(conn, vm_):
    """
    Return the image object to use
    """
    images = conn.list_images()
    vm_image = salt.config.get_cloud_config_value("image", vm_, __opts__)

    for img in images:
        img_id = str(img.id)
        img_name = str(img.name)

        if vm_image and vm_image in (img_id, img_name):
            return img

    raise SaltCloudNotFound(
        "The specified image, '{}', could not be found.".format(vm_image)
    )


def get_size(conn, vm_):
    """
    Return the VM's size object
    """
    sizes = conn.list_sizes()
    vm_size = salt.config.get_cloud_config_value("size", vm_, __opts__)
    if not vm_size:
        return sizes[0]

    for size in sizes:
        if vm_size and str(vm_size) in (str(size.id), str(size.name),):
            return size
    raise SaltCloudNotFound(
        "The specified size, '{}', could not be found.".format(vm_size)
    )


def script(vm_):
    """
    Return the script deployment object
    """
    return ScriptDeployment(
        salt.utils.cloud.os_script(
            salt.config.get_cloud_config_value("os", vm_, __opts__),
            vm_,
            __opts__,
            salt.utils.cloud.salt_config_to_yaml(
                salt.utils.cloud.minion_config(__opts__, vm_)
            ),
        )
    )


def destroy(name, conn=None, call=None):
    """
    Delete a single VM
    """
    if call == "function":
        raise SaltCloudSystemExit(
            "The destroy action must be called with -d, --destroy, " "-a or --action."
        )

    __utils__["cloud.fire_event"](
        "event",
        "destroying instance",
        "salt/cloud/{}/destroying".format(name),
        args={"name": name},
        sock_dir=__opts__["sock_dir"],
        transport=__opts__["transport"],
    )

    if not conn:
        conn = get_conn()  # pylint: disable=E0602

    node = get_node(conn, name)
    profiles = get_configured_provider()["profiles"]  # pylint: disable=E0602
    if node is None:
        log.error("Unable to find the VM %s", name)
    profile = None
    if "metadata" in node.extra and "profile" in node.extra["metadata"]:
        profile = node.extra["metadata"]["profile"]

    flush_mine_on_destroy = False
    if profile and profile in profiles and "flush_mine_on_destroy" in profiles[profile]:
        flush_mine_on_destroy = profiles[profile]["flush_mine_on_destroy"]

    if flush_mine_on_destroy:
        log.info("Clearing Salt Mine: %s", name)

        mopts_ = salt.config.DEFAULT_MINION_OPTS
        conf_path = "/".join(__opts__["conf_file"].split("/")[:-1])
        mopts_.update(salt.config.minion_config(os.path.join(conf_path, "minion")))
        with salt.client.get_local_client(mopts=mopts_) as client:
            minions = client.cmd(name, "mine.flush")

    log.info("Clearing Salt Mine: %s, %s", name, flush_mine_on_destroy)
    log.info("Destroying VM: %s", name)
    ret = conn.destroy_node(node)
    if ret:
        log.info("Destroyed VM: %s", name)
        # Fire destroy action
        __utils__["cloud.fire_event"](
            "event",
            "destroyed instance",
            "salt/cloud/{}/destroyed".format(name),
            args={"name": name},
            sock_dir=__opts__["sock_dir"],
            transport=__opts__["transport"],
        )
        if __opts__["delete_sshkeys"] is True:
            public_ips = getattr(node, __opts__.get("ssh_interface", "public_ips"))
            if public_ips:
                salt.utils.cloud.remove_sshkey(public_ips[0])

            private_ips = getattr(node, __opts__.get("ssh_interface", "private_ips"))
            if private_ips:
                salt.utils.cloud.remove_sshkey(private_ips[0])

        if __opts__.get("update_cachedir", False) is True:
            __utils__["cloud.delete_minion_cachedir"](
                name, __active_provider_name__.split(":")[0], __opts__
            )

        return True

    log.error("Failed to Destroy VM: %s", name)
    return False


def reboot(name, conn=None):
    """
    Reboot a single VM
    """
    if not conn:
        conn = get_conn()  # pylint: disable=E0602

    node = get_node(conn, name)
    if node is None:
        log.error("Unable to find the VM %s", name)
    log.info("Rebooting VM: %s", name)
    ret = conn.reboot_node(node)
    if ret:
        log.info("Rebooted VM: %s", name)
        # Fire reboot action
        __utils__["cloud.fire_event"](
            "event",
            "{} has been rebooted".format(name),
            "salt-cloud" "salt/cloud/{}/rebooting".format(name),
            args={"name": name},
            sock_dir=__opts__["sock_dir"],
            transport=__opts__["transport"],
        )
        return True

    log.error("Failed to reboot VM: %s", name)
    return False


def list_nodes(conn=None, call=None):
    """
    Return a list of the VMs that are on the provider
    """
    if call == "action":
        raise SaltCloudSystemExit(
            "The list_nodes function must be called with -f or --function."
        )

    if not conn:
        conn = get_conn()  # pylint: disable=E0602

    nodes = conn.list_nodes()
    ret = {}
    for node in nodes:
        ret[node.name] = {
            "id": node.id,
            "image": node.image,
            "name": node.name,
            "private_ips": node.private_ips,
            "public_ips": node.public_ips,
            "size": node.size,
            "state": str(node.state).upper(),
        }
    return ret


def list_nodes_full(conn=None, call=None):
    """
    Return a list of the VMs that are on the provider, with all fields
    """
    if call == "action":
        raise SaltCloudSystemExit(
            "The list_nodes_full function must be called with -f or --function."
        )

    if not conn:
        conn = get_conn()  # pylint: disable=E0602

    nodes = conn.list_nodes()
    ret = {}
    for node in nodes:
        pairs = {}
        for key, value in zip(node.__dict__, node.__dict__.values()):
            pairs[key] = value
        ret[node.name] = pairs
        del ret[node.name]["driver"]

    __utils__["cloud.cache_node_list"](
        ret, __active_provider_name__.split(":")[0], __opts__
    )
    return ret


def list_nodes_select(conn=None, call=None):
    """
    Return a list of the VMs that are on the provider, with select fields
    """
    if not conn:
        conn = get_conn()  # pylint: disable=E0602

    return salt.utils.cloud.list_nodes_select(
        list_nodes_full(conn, "function"), __opts__["query.selection"], call,
    )


def show_instance(name, call=None):
    """
    Show the details from the provider concerning an instance
    """
    if call != "action":
        raise SaltCloudSystemExit(
            "The show_instance action must be called with -a or --action."
        )

    nodes = list_nodes_full()
    __utils__["cloud.cache_node"](nodes[name], __active_provider_name__, __opts__)
    return nodes[name]


def conn_has_method(conn, method_name):
    """
    Find if the provided connection object has a specific method
    """
    if method_name in dir(conn):
        return True

    log.error("Method '%s' not yet supported!", method_name)
    return False
