import contextlib

from vrtManager import util
from vrtManager.connection import wvmConnect


class wvmStorages(wvmConnect):
    def get_storages_info(self):
        get_storages = self.get_storages()
        storages = []
        for pool in get_storages:
            stg = self.get_storage(pool)
            stg_status = stg.isActive()
            stg_type = util.get_xml_path(stg.XMLDesc(0), "/pool/@type")
            stg_vol = len(stg.listVolumes()) if stg_status else None
            stg_size = stg.info()[1]
            storages.append(
                {"name": pool, "status": stg_status, "type": stg_type, "volumes": stg_vol, "size": stg_size}
            )
        return storages

    def define_storage(self, xml, flag):
        self.wvm.storagePoolDefineXML(xml, flag)

    def create_storage(self, stg_type, name, source, target):
        xml = f"""<pool type='{stg_type}'>
                 <name>{name}</name>"""
        if stg_type == "logical":
            xml += f"""<source>
                            <device path='{source}'/>
                            <name>{name}</name>
                            <format type='lvm2'/>
                        </source>"""
        if stg_type == "logical":
            target = f"/dev/{name}"
        xml += f"""
                  <target>
                       <path>{target}</path>
                  </target>
                </pool>"""
        self.define_storage(xml, 0)
        stg = self.get_storage(name)
        if stg_type == "logical":
            stg.build(0)
        stg.create(0)
        stg.setAutostart(1)

        return stg

    def create_storage_ceph(self, stg_type, name, ceph_pool, ceph_host, ceph_user, secret):
        xml = f"""
                <pool type='{stg_type}'>
                <name>{name}</name>
                <source>
                    <name>{ceph_pool}</name>
                    <host name='{ceph_host}' port='6789'/>
                    <auth username='{ceph_user}' type='ceph'>
                        <secret uuid='{secret}'/>
                    </auth>
                </source>
                </pool>
                """
        self.define_storage(xml, 0)
        stg = self.get_storage(name)
        stg.create(0)
        stg.setAutostart(1)

    def create_storage_netfs(self, stg_type, name, netfs_host, source, source_format, target):
        xml = f"""
                <pool type='{stg_type}'>
                <name>{name}</name>
                <source>
                    <host name='{netfs_host}'/>
                    <dir path='{source}'/>
                    <format type='{source_format}'/>
                </source>
                <target>
                    <path>{target}</path>
                </target>
                </pool>
                """
        self.define_storage(xml, 0)
        stg = self.get_storage(name)
        stg.create(0)
        stg.setAutostart(1)

        return stg


class wvmStorage(wvmConnect):
    def __init__(self, host, login, passwd, conn, pool):
        wvmConnect.__init__(self, host, login, passwd, conn)
        self.pool = self.get_storage(pool)

    def get_name(self):
        return self.pool.name()

    def get_status(self):
        status = ["Not running", "Initializing pool, not available", "Running normally", "Running degraded"]
        try:
            return status[self.pool.info()[0]]
        except ValueError:
            return "Unknown"

    def get_size(self):
        return [self.pool.info()[1], self.pool.info()[3]]

    def _XMLDesc(self, flags):
        return self.pool.XMLDesc(flags)

    def _createXML(self, xml, flags):
        self.pool.createXML(xml, flags)

    def _createXMLFrom(self, xml, vol, flags):
        self.pool.createXMLFrom(xml, vol, flags)

    def _define(self, xml):
        return self.wvm.storagePoolDefineXML(xml, 0)

    def is_active(self):
        return self.pool.isActive()

    def get_uuid(self):
        return self.pool.UUIDString()

    def start(self):
        return self.pool.create(0)

    def stop(self):
        return self.pool.destroy()

    def delete(self):
        self.pool.undefine()

    def get_autostart(self):
        return self.pool.autostart()

    def set_autostart(self, value):
        self.pool.setAutostart(value)

    def get_type(self):
        return util.get_xml_path(self._XMLDesc(0), "/pool/@type")

    def get_target_path(self):
        return util.get_xml_path(self._XMLDesc(0), "/pool/target/path")

    def get_source_name(self):
        return util.get_xml_path(self._XMLDesc(0), "/pool/source/name")

    def get_allocation(self):
        return int(util.get_xml_path(self._XMLDesc(0), "/pool/allocation"))

    def get_available(self):
        return int(util.get_xml_path(self._XMLDesc(0), "/pool/available"))

    def get_capacity(self):
        return int(util.get_xml_path(self._XMLDesc(0), "/pool/capacity"))

    def get_rbd_source(self):
        def hosts(doc):
            hosts_array = []

            for host in doc.xpath("/pool/source/host"):
                name = host.get('name')
                if name:
                    port = host.get('port')
                    if port:
                        hosts_array.append({"hostname": name, "hostport": port})
                    else:
                        hosts_array.append({"hostname": name})

            name = doc.get('name')
            auth = doc.xpath("/pool/source/auth")
            auth_type = auth[0].get("type")
            auth_user = auth[0].get("username")
            auth_uuid = auth[0].xpath("secret/@uuid")[0]

            return({
                "name": name,
                "auth_type": auth_type,
                "auth_user": auth_user,
                "auth_uuid": auth_uuid,
                "hosts": hosts_array
            })
        return util.get_xml_path(self._XMLDesc(0), func=hosts)

    def get_pretty_allocation(self):
        return util.pretty_bytes(self.get_allocation())

    def get_pretty_available(self):
        return util.pretty_bytes(self.get_available())

    def get_pretty_capacity(self):
        return util.pretty_bytes(self.get_capacity())

    def get_volumes(self):
        return self.pool.listVolumes()

    def get_volume(self, name):
        return self.pool.storageVolLookupByName(name)

    def get_volume_size(self, name):
        vol = self.get_volume(name)
        return vol.info()[1]

    def get_volume_allocation(self, name):
        vol = self.get_volume(name)
        return vol.info()[2]

    def _vol_XMLDesc(self, name):
        vol = self.get_volume(name)
        return vol.XMLDesc(0)

    def del_volume(self, name):
        vol = self.pool.storageVolLookupByName(name)
        vol.delete(0)

    def get_volume_format_type(self, name):
        vol_xml = self._vol_XMLDesc(name)
        return util.get_xml_path(vol_xml, "/volume/target/format/@type")

    def get_volume_type(self, name):
        vol_xml = self._vol_XMLDesc(name)
        return util.get_xml_path(vol_xml, "/volume/@type")

    def refresh(self):
        return self.pool.refresh(0)

    def get_volume_details(self, volname):
        with contextlib.suppress(Exception):
            self.refresh()

        vols = self.get_volumes()
        return [{"name": volname, 
                 "size": self.get_volume_size(volname),
                 "allocation": self.get_volume_allocation(volname),
                 "type": self.get_volume_format_type(volname)} for volname in vols]
                 
    def get_volume_details(self, volname):
        with contextlib.suppress(Exception):
            self.refresh()
        return {
                "name": volname,
                "size": self.get_volume_size(volname),
                "allocation": self.get_volume_allocation(volname),
                "type": self.get_volume_format_type(volname),
        }

    def update_volumes(self):
        with contextlib.suppress(Exception):
            self.refresh()
        vols = self.get_volumes()
        return [{"name": volname, "size": self.get_volume_size(volname),
                 "allocation": self.get_volume_allocation(volname),
                 "type": self.get_volume_format_type(volname)} for volname in vols]

    def create_volume(self, name, size, vol_fmt="qcow2", metadata=False, disk_owner_uid=0, disk_owner_gid=0):
        size = int(size) * 1073741824
        storage_type = self.get_type()
        alloc = size
        if vol_fmt == "unknown":
            vol_fmt = "raw"
        if storage_type == "dir":
            name += f".{vol_fmt}" if vol_fmt in ("qcow", "qcow2") else ".img"
            alloc = 0
        xml = f"""
            <volume>
                <name>{name}</name>
                <capacity>{size}</capacity>
                <allocation>{alloc}</allocation>
                <target>
                    <format type='{vol_fmt}'/>
                     <permissions>
                        <owner>{disk_owner_uid}</owner>
                        <group>{disk_owner_gid}</group>
                        <mode>0644</mode>
                        <label>virt_image_t</label>
                    </permissions>"""
        if vol_fmt == "qcow2":
            xml += """
                      <compat>1.1</compat>
                      <features>
                         <lazy_refcounts/>
                      </features>"""
        xml += """</target>
                </volume>"""
        self._createXML(xml, metadata)
        return name

    def clone_volume(
        self,
        name,
        target_file,
        vol_fmt=None,
        metadata=False,
        mode="0644",
        file_suffix="img",
        disk_owner_uid=0,
        disk_owner_gid=0,
    ):
        vol = self.get_volume(name)
        if not vol_fmt:
            vol_fmt = self.get_volume_format_type(name)

        storage_type = self.get_type()
        if storage_type == "dir":
            if vol_fmt in ["qcow", "qcow2"]:
                target_file += f".{vol_fmt}"
            else:
                suffix = f".{file_suffix}"
                target_file += suffix if len(suffix) > 1 else ""

        xml = f"""
            <volume>
                <name>{target_file}</name>
                <capacity>0</capacity>
                <allocation>0</allocation>
                <target>
                    <format type='{vol_fmt}'/>
                    <permissions>
                        <owner>{disk_owner_uid}</owner>
                        <group>{disk_owner_gid}</group>
                        <mode>{mode}</mode>
                        <label>virt_image_t</label>
                    </permissions>"""
        if vol_fmt == "qcow2":
            xml += """
                    <compat>1.1</compat>
                    <features>
                        <lazy_refcounts/>
                    </features>"""
        xml += """ </target>
            </volume>"""
        self._createXMLFrom(xml, vol, metadata)
        return target_file