Implement play media to set a channel based on (by priority): (#13934)

- exact channel number
 - exact channel name
 - similar channel name temp

homeassistant/components/media_player/webostv.py

@@ -344,6 +344,42 @@ class LgWebOSDevice(MediaPlayerDevice):
             self._current_source = source_dict['label']
             self._client.set_input(source_dict['id'])
 
+    def play_media(self, media_type, media_id, **kwargs):
+        """Play a piece of media."""
+        _LOGGER.debug(
+            "Call play media type <%s>, Id <%s>", media_type, media_id)
+
+        if media_type == MEDIA_TYPE_CHANNEL:
+            _LOGGER.debug("Searching channel...")
+            partial_match_channel_id = None
+
+            for channel in self._client.get_channels():
+                _LOGGER.debug(
+                    "Checking channel number <%s>, name <%s>, id <%s>...",
+                    channel['channelNumber'],
+                    channel['channelName'],
+                    channel['channelId'])
+                if media_id == channel['channelNumber']:
+                    _LOGGER.debug(
+                        "Perfect match on channel number: switching!")
+                    self._client.set_channel(channel['channelId'])
+                    return
+                elif media_id.lower() == channel['channelName'].lower():
+                    _LOGGER.debug(
+                        "Perfect match on channel name: switching!")
+                    self._client.set_channel(channel['channelId'])
+                    return
+                elif media_id.lower() in channel['channelName'].lower():
+                    _LOGGER.debug(
+                        "Partial match on channel name: saving it...")
+                    partial_match_channel_id = channel['channelId']
+
+            if partial_match_channel_id is not None:
+                _LOGGER.debug(
+                    "Using partial match on channel name: switching!")
+                self._client.set_channel(partial_match_channel_id)
+                return
+
     def media_play(self):
         """Send play command."""
         self._playing = True