Move connect_single to SmartDevice.connect (#538)

This refactors `Discover.connect_single` by moving device instance construction into a separate device factory module.
New `SmartDevice.connect(host, *, port, timeout, credentials, device_type)` class method replaces the functionality of `connect_single`,
and also now allows constructing device instances without relying on UDP discovery for type discovery if `device_type` parameter is set.

---------

Co-authored-by: Teemu R. <tpr@iki.fi>

kasa/cli.py

@@ -13,14 +13,13 @@ import asyncclick as click
 from kasa import (
     AuthenticationException,
     Credentials,
+    DeviceType,
     Discover,
     SmartBulb,
     SmartDevice,
-    SmartDimmer,
-    SmartLightStrip,
-    SmartPlug,
     SmartStrip,
 )
+from kasa.device_factory import DEVICE_TYPE_TO_CLASS
 
 try:
     from rich import print as _do_echo
@@ -43,13 +42,11 @@ except ImportError:
 # --json has set it to _nop_echo
 echo = _do_echo
 
-TYPE_TO_CLASS = {
-    "plug": SmartPlug,
-    "bulb": SmartBulb,
-    "dimmer": SmartDimmer,
-    "strip": SmartStrip,
-    "lightstrip": SmartLightStrip,
-}
+DEVICE_TYPES = [
+    device_type.value
+    for device_type in DeviceType
+    if device_type in DEVICE_TYPE_TO_CLASS
+]
 
 click.anyio_backend = "asyncio"
 
@@ -129,7 +126,7 @@ def json_formatter_cb(result, **kwargs):
     "--type",
     envvar="KASA_TYPE",
     default=None,
-    type=click.Choice(list(TYPE_TO_CLASS), case_sensitive=False),
+    type=click.Choice(DEVICE_TYPES, case_sensitive=False),
 )
 @click.option(
     "--json", default=False, is_flag=True, help="Output raw device response as JSON."
@@ -235,7 +232,10 @@ async def cli(
         return await ctx.invoke(discover, timeout=discovery_timeout)
 
     if type is not None:
-        dev = TYPE_TO_CLASS[type](host, credentials=credentials)
+        device_type = DeviceType.from_value(type)
+        dev = await SmartDevice.connect(
+            host, credentials=credentials, device_type=device_type
+        )
     else:
         echo("No --type defined, discovering..")
         dev = await Discover.discover_single(
@@ -243,8 +243,8 @@ async def cli(
             port=port,
             credentials=credentials,
         )
+        await dev.update()
 
-    await dev.update()
     ctx.obj = dev
 
     if ctx.invoked_subcommand is None: