"""What the ESXi and vCenter drivers share: session, VM lookup, common getters."""

from __future__ import annotations

from pathlib import Path
from typing import Any, ClassVar

from napalm.base.exceptions import ConnectionException
from napalm_device_types import HypervisorDriver
from napalm_device_types.models import (
    SnapshotDict,
    StorageVolumeDict,
    VirtualNetworkDict,
    VMConfigDict,
)

from napalm_vmware import _session, paths
from napalm_vmware._inventory import Inventory
from napalm_vmware.parse.environment import environment
from napalm_vmware.parse.networks import NetworkIndex, network_index, virtual_networks
from napalm_vmware.parse.snapshots import snapshot_list
from napalm_vmware.parse.storage import storage_pools
from napalm_vmware.parse.vm_config import vm_config
from napalm_vmware.parse.vms import vm_list
from napalm_vmware.parse.warnings import host_warnings
from napalm_vmware.provision.image import DEFAULT_CACHE_DIR

_DEFAULT_PORT = 443
#: ``about.apiType`` -> the driver that handles it, for a helpful refusal.
_DRIVER_FOR_API = {"HostAgent": "vmware_esxi", "VirtualCenter": "vmware_vcenter"}


class VmwareBaseDriver(HypervisorDriver):
    """Shared implementation. Concrete drivers set ``API_TYPE`` and ``STANDALONE``."""

    VENDOR = "VMware"
    USES_SSH = False
    platform = "vmware"

    #: ``about.apiType`` this driver accepts.
    API_TYPE: ClassVar[str] = ""
    #: True when the driver talks to one host directly (ESXi), False for vCenter.
    STANDALONE: ClassVar[bool] = True

    def __init__(
        self,
        hostname: str,
        username: str,
        password: str,
        timeout: int = 60,
        optional_args: dict[str, Any] | None = None,
    ) -> None:
        self.hostname = hostname
        self.username = username
        self.password = password
        self.timeout = timeout
        args = optional_args or {}
        self._port = int(args.get("port") or _DEFAULT_PORT)
        self._verify_ssl = bool(args.get("verify_ssl", args.get("ssl_verify", True)))
        # Where converted cloud images are kept between provisioning jobs.
        self._image_cache_dir = Path(args.get("image_cache_dir") or DEFAULT_CACHE_DIR)
        self._si: Any = None
        self._inventory: Any = None

    # -- session -------------------------------------------------------------

    def open(self) -> None:
        try:
            si = _session.connect(
                self.hostname,
                self._port,
                self.username,
                self.password,
                verify_ssl=self._verify_ssl,
                timeout=self.timeout,
            )
        except Exception as exc:
            raise ConnectionException(f"Cannot connect to {self.hostname}: {exc}") from exc
        inventory = Inventory(si.RetrieveContent())
        about = inventory.about()
        if about.get("apiType") != self.API_TYPE:
            _session.disconnect(si)
            other = _DRIVER_FOR_API.get(about.get("apiType", ""), "another driver")
            raise ConnectionException(
                f"{self.hostname} is {about.get('fullName', 'not a supported VMware endpoint')}"
                f"; use the {other} driver for it"
            )
        self._si, self._inventory = si, inventory

    def close(self) -> None:
        if self._si is not None:
            _session.disconnect(self._si)
        self._si = self._inventory = None

    def is_alive(self) -> dict[str, bool]:
        return {"is_alive": self._si is not None and _session.alive(self._si)}

    def _mo(self, vim_type: Any, moref: str) -> Any:
        """A live managed-object reference for a MoRef id from a plain row."""
        return vim_type(moref, self._si._stub)

    # -- inventory reads -------------------------------------------------------

    def _hosts(self) -> list[dict[str, Any]]:
        return self._inventory.collect("HostSystem", paths.HOST)

    def _vm_rows(self) -> list[dict[str, Any]]:
        return self._inventory.collect("VirtualMachine", paths.VM)

    def _index(self, hosts: list[dict[str, Any]]) -> NetworkIndex:
        dv_portgroups = self._inventory.collect("DistributedVirtualPortgroup", paths.DV_PORTGROUP)
        return network_index(hosts, dv_portgroups)

    def _find_vm(self, name: str) -> dict[str, Any]:
        """The VM whose instance UUID, MoRef or name is ``name``."""
        vms = [
            vm
            for vm in self._vm_rows()
            if vm.get("config.instanceUuid") and not vm.get("config.template")
        ]
        for key in ("config.instanceUuid", "_moref"):
            match = [vm for vm in vms if vm.get(key) == name]
            if match:
                return match[0]
        match = [vm for vm in vms if vm.get("name") == name]
        if len(match) > 1:
            raise ValueError(f"{len(match)} VMs are named {name!r}; address one by its vmid")
        if not match:
            raise ValueError(f"There is no VM named or identified by {name!r}")
        return match[0]

    # -- HypervisorDriver ------------------------------------------------------

    def get_vms(self) -> list[dict[str, Any]]:
        hosts = self._hosts()
        return vm_list(self._vm_rows(), hosts, self._index(hosts))

    def get_vm_config(self, name: str) -> VMConfigDict:
        return vm_config(self._find_vm(name), self._index(self._hosts()))

    def get_vm_snapshots(self, name: str) -> list[SnapshotDict]:
        return snapshot_list(self._find_vm(name))

    def get_vm_storage_pools(self) -> dict[str, StorageVolumeDict]:
        return storage_pools(self._inventory.collect("Datastore", paths.DATASTORE))

    def get_virtual_networks(self) -> dict[str, VirtualNetworkDict]:
        return virtual_networks(  # type: ignore[return-value]
            self._hosts(),
            self._inventory.collect("DistributedVirtualPortgroup", paths.DV_PORTGROUP),
            self._inventory.collect("DistributedVirtualSwitch", paths.DV_SWITCH),
        )

    def get_environment(self) -> dict[str, Any]:
        return environment(self._hosts())

    def get_device_warnings(self) -> list[dict[str, Any]]:
        return host_warnings(self._hosts(), self._inventory.licenses(), standalone=self.STANDALONE)