import contextlib
import string

from vrtManager import util
from vrtManager.connection import wvmConnect


def get_rbd_storage_data(stg):
    xml = stg.XMLDesc(0)
    ceph_user = util.get_xml_path(xml, "/pool/source/auth/@username")

    def get_ceph_hosts(doc):
        hosts = list()
        for host in doc.xpath("/pool/source/host"):
            name = host.get('name')
            if name:
                port = host.get('port')
                if port:
                    hosts.append({"name": name, "port": port})
                else:
                    hosts.append({"name": name})
        return hosts

    ceph_hosts = util.get_xml_path(xml, func=get_ceph_hosts)
    secret_uuid = util.get_xml_path(xml, "/pool/source/auth/secret/@uuid")
    return ceph_user, secret_uuid, ceph_hosts


class wvmCreate(wvmConnect):
    def get_storages_images(self):
        """
        Function return all images on all storages
        """
        images = []
        storages = self.get_storages(only_actives=True)
        for storage in storages:
            stg = self.get_storage(storage)
            with contextlib.suppress(Exception):
                stg.refresh(0)
            images.extend(img for img in stg.listVolumes() if not img.lower().endswith(".iso"))
        return images

    def get_os_type(self):
        """Get guest os type"""
        return util.get_xml_path(self.get_cap_xml(), "/capabilities/guest/os_type")

    def get_host_arch(self):
        """Get host architecture"""
        return util.get_xml_path(self.get_cap_xml(), "/capabilities/host/cpu/arch")

    def create_volume(self, storage, name, size, image_format, metadata=False, disk_owner_uid=0, disk_owner_gid=0):
        size = int(size) * 1073741824
        stg = self.get_storage(storage)
        storage_type = util.get_xml_path(stg.XMLDesc(0), "/pool/@type")
        if storage_type == "dir":
            name += f".{image_format}" if image_format in ("qcow", "qcow2") else ".img"
            alloc = 0
        else:
            image_format = 'raw'
            alloc = size
            metadata = False
        xml = f"""
            <volume>
                <name>{name}</name>
                <capacity>{size}</capacity>
                <allocation>{alloc}</allocation>
                <target>
                    <format type='{image_format}'/>
                     <permissions>
                        <owner>{disk_owner_uid}</owner>
                        <group>{disk_owner_gid}</group>
                        <mode>0644</mode>
                        <label>virt_image_t</label>
                    </permissions>
                    <compat>1.1</compat>
                    <features>
                        <lazy_refcounts/>
                    </features>
                </target>
            </volume>"""
        stg.createXML(xml, metadata)

        with contextlib.suppress(Exception):
            stg.refresh(0)
        vol = stg.storageVolLookupByName(name)
        return vol.path()

    def get_volume_format_type(self, path):
        vol = self.get_volume_by_path(path)
        vol_type = util.get_xml_path(vol.XMLDesc(0), "/volume/target/format/@type")
        return "raw" if vol_type in ["unknown", "iso"] else vol_type or "raw"

    def get_volume_path(self, volume, pool=None):
        storages = [pool] if pool else self.get_storages(only_actives=True)
        for storage in storages:
            stg = self.get_storage(storage)
            if stg.info()[0] != 0:
                stg.refresh(0)
                for img in stg.listVolumes():
                    if img == volume:
                        vol = stg.storageVolLookupByName(img)
                        return vol.path()

    def get_storage_by_vol_path(self, vol_path):
        vol = self.get_volume_by_path(vol_path)
        return vol.storagePoolLookupByVolume()

    def clone_from_template(self, clone, template, storage=None, metadata=False, disk_owner_uid=0, disk_owner_gid=0):
        vol = self.get_volume_by_path(template)
        stg = self.get_storage(storage) if storage else vol.storagePoolLookupByVolume()

        storage_type = util.get_xml_path(stg.XMLDesc(0), "/pool/@type")
        format = util.get_xml_path(vol.XMLDesc(0), "/volume/target/format/@type")
        if storage_type == "dir":
            clone += ".img"
        else:
            metadata = False
        xml = f"""
            <volume>
                <name>{clone}</name>
                <capacity>0</capacity>
                <allocation>0</allocation>
                <target>
                    <format type='{format}'/>
                     <permissions>
                        <owner>{disk_owner_uid}</owner>
                        <group>{disk_owner_gid}</group>
                        <mode>0644</mode>
                        <label>virt_image_t</label>
                    </permissions>
                    <compat>1.1</compat>
                    <features>
                        <lazy_refcounts/>
                    </features>
                </target>
            </volume>"""
        stg.createXMLFrom(xml, vol, metadata)
        clone_vol = stg.storageVolLookupByName(clone)
        return clone_vol.path()

    def _defineXML(self, xml):
        self.wvm.defineXML(xml)

    def delete_volume(self, path):
        vol = self.get_volume_by_path(path)
        vol.delete()

    def create_instance(
        self,
        name,
        memory,
        vcpu,
        vcpu_mode,
        uuid,
        arch,
        machine,
        firmware,
        volumes,
        networks,
        nwfilter,
        graphics,
        virtio,
        listener_addr,
        video="vga",
        console_pass="random",
        mac=None,
        qemu_ga=True,
        add_cdrom="sata",
        add_input="default"
    ):
        """
        Create VM function
        """
        caps = self.get_capabilities(arch)
        dom_caps = self.get_dom_capabilities(arch, machine)

        memory = int(memory) * 1024

        xml = f"""
                <domain type='{dom_caps["domain"]}'>
                  <name>{name}</name>
                  <description>None</description>
                  <uuid>{uuid}</uuid>
                  <memory unit='KiB'>{memory}</memory>
                  <vcpu>{vcpu}</vcpu>"""

        if dom_caps["os_support"] == "yes":
            xml += f"""<os>
                          <type arch='{arch}' machine='{machine}'>{caps["os_type"]}</type>"""
            xml += """    <boot dev='hd'/>
                          <boot dev='cdrom'/>
                          <bootmenu enable='yes'/>"""
            if firmware:
                if firmware["secure"] == "yes":
                    xml += """<loader readonly='%s' type='%s' secure='%s'>%s</loader>""" % (
                        firmware["readonly"],
                        firmware["type"],
                        firmware["secure"],
                        firmware["loader"],
                    )
                if firmware["secure"] == "no":
                    xml += """<loader readonly='%s' type='%s'>%s</loader>""" % (
                        firmware["readonly"],
                        firmware["type"],
                        firmware["loader"],
                    )
            xml += """</os>"""

        if caps["features"]:
            xml += """<features>"""
            for feat in [x for x in ("acpi", "apic", "pae",) if x in caps["features"]]:
                xml += f"""<{feat}/>"""
            if firmware.get("secure", "no") == "yes":
                xml += """<smm state="on"/>"""
            xml += """</features>"""

        if vcpu_mode == "host-model":
            xml += """<cpu mode='host-model'/>"""
        elif vcpu_mode == "host-passthrough":
            xml += """<cpu mode='host-passthrough'/>"""
        elif vcpu_mode != "":
            xml += f"""<cpu mode='custom' match='exact' check='none'>
                        <model fallback='allow'>{vcpu_mode}</model>"""
            xml += """</cpu>"""

        xml += """
                  <clock offset="utc"/>
                  <on_poweroff>destroy</on_poweroff>
                  <on_reboot>restart</on_reboot>
                  <on_crash>restart</on_crash>
                """
        xml += """<devices>"""

        vd_disk_letters = list(string.ascii_lowercase)
        fd_disk_letters = list(string.ascii_lowercase)
        hd_disk_letters = list(string.ascii_lowercase)
        sd_disk_letters = list(string.ascii_lowercase)
        def get_letter(bus_type):
            if bus_type == "ide":
                return hd_disk_letters.pop(0)
            elif bus_type in ["sata", "scsi"]:
                return sd_disk_letters.pop(0)
            elif bus_type == "fdc":
                return fd_disk_letters.pop(0)
            elif bus_type == "virtio":
                return vd_disk_letters.pop(0)
            else:
                return sd_disk_letters.pop(0)
        

        for volume in volumes:
            disk_opts = ""
            if volume["cache_mode"] is not None and volume["cache_mode"] != "default":
                disk_opts += f"cache='{volume['cache_mode']}' "
            if volume["io_mode"] is not None and volume["io_mode"] != "default":
                disk_opts += f"io='{volume['io_mode']}' "
            if volume["discard_mode"] is not None and volume["discard_mode"] != "default":
                disk_opts += f"discard='{volume['discard_mode']}' "
            if volume["detect_zeroes_mode"] is not None and volume["detect_zeroes_mode"] != "default":
                disk_opts += f"detect_zeroes='{volume['detect_zeroes_mode']}' "

            stg = self.get_storage_by_vol_path(volume["path"])
            stg_type = util.get_xml_path(stg.XMLDesc(0), "/pool/@type")

            if volume["device"] == "cdrom":
                add_cdrom = "None"

            if stg_type == "rbd":
                ceph_user, secret_uuid, ceph_hosts = get_rbd_storage_data(stg)
                xml += f"""<disk type='network' device='disk'>
                            <driver name='qemu' type='{volume["type"]}' {disk_opts} />"""
                xml += f"""  <auth username='{ceph_user}'>
                                <secret type='ceph' uuid='{secret_uuid}'/>
                            </auth>
                            <source protocol='rbd' name='{volume["path"]}'>"""
                if isinstance(ceph_hosts, list):
                    for host in ceph_hosts:
                        if host.get("port"):
                            xml += f"""
                                   <host name='{host.get("name")}' port='{host.get("port")}'/>"""
                        else:
                            xml += f"""<host name='{host.get("name")}'/>"""
                xml += """</source>"""
            else:
                xml += f"""<disk type='file' device='{volume["device"]}'>"""
                xml += f""" <driver name='qemu' type='{volume["type"]}' {disk_opts}/>"""
                xml += f""" <source file='{volume["path"]}'/>"""

            if volume.get("bus") in dom_caps["disk_bus"]:
                dev_prefix = util.vol_dev_type(volume.get("bus"))
                xml += """<target dev='%s%s' bus='%s'/>""" % (dev_prefix, get_letter(volume.get("bus")), volume.get("bus"))
            else:
                xml += """<target dev='sd%s'/>""" % get_letter("sata")
            xml += """</disk>"""

            if volume.get("bus") == "scsi":
                xml += f"""<controller type='scsi' model='{volume.get('scsi_model')}'/>"""

        if add_cdrom != "None":
            xml += """<disk type='file' device='cdrom'>
                          <driver name='qemu' type='raw'/>
                          <source file = '' />
                          <readonly/>"""
            if add_cdrom in dom_caps["disk_bus"]:
                dev_prefix = util.vol_dev_type(add_cdrom)
                xml += """<target dev='%s%s' bus='%s'/>""" % (dev_prefix, get_letter(add_cdrom), add_cdrom)
            xml += """</disk>"""

        if mac:
            macs = mac.split(',')
        for idx, net in enumerate(networks.split(",")):
            xml += """<interface type='network'>"""
            if mac:
                xml += f"""<mac address='{macs[idx]}'/>"""
            xml += f"""<source network='{net}'/>"""
            if nwfilter:
                xml += f"""<filterref filter='{nwfilter}'/>"""
            if virtio:
                xml += """<model type='virtio'/>"""
            xml += """</interface>"""

        if console_pass == "random":
            console_pass = "passwd='" + util.randomPasswd() + "'"
        elif console_pass != "":
            console_pass = "passwd='" + console_pass + "'"

        if add_input != "None":
            xml += """<controller type='usb'/>"""
            if add_input in dom_caps["disk_bus"]:
                xml += f"""<input type='mouse' bus='{add_input}'/>"""
                xml += f"""<input type='keyboard' bus='{add_input}'/>"""
                xml += f"""<input type='tablet' bus='{add_input}'/>"""
            else:
                xml += """<input type='mouse'/>"""
                xml += """<input type='keyboard'/>"""
                xml += """<input type='tablet'/>"""

        xml += f"""
                <graphics type='{graphics}' port='-1' autoport='yes' {console_pass} listen='{listener_addr}'/>
                <console type='pty'/> """

        if qemu_ga and virtio:
            xml += """ <channel type='unix'>
                            <target type='virtio' name='org.qemu.guest_agent.0'/>
                       </channel>"""

        xml += f""" <video>
                      <model type='{video}'/>
                   </video>
              </devices>
            </domain>"""
        return self._defineXML(xml)