from jnpr.junos import JXML
from jnpr.junos.cfg import Resource
from jnpr.junos.cfg.phyport.base import PhyPortBase
from lxml.builder import E


class PhyPortSwitch(PhyPortBase):
    PORT_SPEED = {
        "auto": "auto-negotiation",
        "10m": "ethernet-10m",
        "100m": "ethernet-100m",
        "1g": "ethernet-1g",
    }

    # -----------------------------------------------------------------------
    # XML readers
    # -----------------------------------------------------------------------

    def _xml_to_py(self, has_xml, has_py):
        PhyPortBase._xml_to_py(self, has_xml, has_py)

        # speed, duplex, loopback are all under 'ether-options'
        ethopts = has_xml.find("ether-options")
        if ethopts is None:
            return

        if ethopts.find("loopback") is not None:
            has_py["loopback"] = True

        speed = ethopts.find("speed")
        if speed is not None:
            # take the first child element
            has_py["speed"] = speed[0].tag
            PhyPortBase._set_invert(has_py, "speed", self.PORT_SPEED)

        Resource.copyifexists(ethopts, "link-mode", has_py, "duplex")
        if "duplex" in has_py:
            PhyPortBase._set_invert(has_py, "duplex", self.PORT_DUPLEX)

    # -----------------------------------------------------------------------
    # XML writers
    # -----------------------------------------------------------------------

    def _xml_hook_build_change_begin(self, xml):
        if any([this in self.should for this in ["speed", "duplex", "loopback"]]):
            self._ethopts = E("ether-options")
            xml.append(self._ethopts)

    def _xml_change_speed(self, xml):
        speed_tag = self.PORT_SPEED.get(self.speed)
        add_this = E.speed(JXML.DEL) if speed_tag is None else E.speed(E(speed_tag))
        self._ethopts.append(add_this)
        return True

    def _xml_change_duplex(self, xml):
        value = self.PORT_DUPLEX.get(self.duplex)
        Resource.xml_set_or_delete(self._ethopts, "link-mode", value)
        return True

    def _xml_change_loopback(self, xml):
        self._ethopts.append(Resource.xmltag_set_or_del("loopback", self.loopback))
        return True
