Add media browser integration for Home Assistant

- Implement async_browse_media() to enable browsing media folders through HA Media Browser UI
- Add async_play_media() to handle file playback from media browser
- Add play_media_file service for automation support
- Add BROWSE_MEDIA and PLAY_MEDIA feature flags
- Implement media browser API client methods (get_media_folders, browse_folder, play_media_file)
- Fix path separator handling for cross-platform compatibility

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

custom_components/remote_media_player/media_player.py

@@ -8,11 +8,16 @@ from datetime import datetime, timedelta
 from typing import Any
 
 from homeassistant.components.media_player import (
+    BrowseMedia,
     MediaPlayerEntity,
     MediaPlayerEntityFeature,
     MediaPlayerState,
     MediaType,
 )
+from homeassistant.components.media_player.const import (
+    MediaClass,
+)
+from urllib.parse import quote, unquote
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_NAME
 from homeassistant.core import HomeAssistant, callback
@@ -303,6 +308,8 @@ class RemoteMediaPlayerEntity(CoordinatorEntity[MediaPlayerCoordinator], MediaPl
             | MediaPlayerEntityFeature.SEEK
             | MediaPlayerEntityFeature.TURN_ON
             | MediaPlayerEntityFeature.TURN_OFF
+            | MediaPlayerEntityFeature.BROWSE_MEDIA
+            | MediaPlayerEntityFeature.PLAY_MEDIA
         )
 
     @property
@@ -489,3 +496,151 @@ class RemoteMediaPlayerEntity(CoordinatorEntity[MediaPlayerCoordinator], MediaPl
             await self.coordinator.client.toggle()
         except MediaServerError as err:
             _LOGGER.error("Failed to toggle: %s", err)
+
+    # Media Browser support
+
+    @staticmethod
+    def _encode_media_id(folder_id: str, path: str = "") -> str:
+        """Encode folder_id and path into media_content_id.
+
+        Format: folder_id|encoded_path
+        Root folder: folder_id|
+        """
+        return f"{folder_id}|{quote(path, safe='')}"
+
+    @staticmethod
+    def _decode_media_id(media_content_id: str) -> tuple[str, str]:
+        """Decode media_content_id into folder_id and path.
+
+        Returns:
+            Tuple of (folder_id, path)
+        """
+        if not media_content_id or "|" not in media_content_id:
+            return "", ""
+        folder_id, encoded_path = media_content_id.split("|", 1)
+        path = unquote(encoded_path) if encoded_path else ""
+        return folder_id, path
+
+    async def async_browse_media(
+        self,
+        media_content_type: str | None = None,
+        media_content_id: str | None = None,
+    ) -> BrowseMedia:
+        """Implement the media browsing.
+
+        Args:
+            media_content_type: Type of media (unused, but required by HA)
+            media_content_id: ID in format "folder_id|path" or None for root
+
+        Returns:
+            BrowseMedia object with children
+        """
+        _LOGGER.debug("Browse media: type=%s, id=%s", media_content_type, media_content_id)
+
+        # Root level - list all folders
+        if not media_content_id:
+            folders = await self.coordinator.client.get_media_folders()
+
+            children = [
+                BrowseMedia(
+                    title=config["label"],
+                    media_class=MediaClass.DIRECTORY,
+                    media_content_type=MediaType.MUSIC,  # All folders show as music
+                    media_content_id=self._encode_media_id(folder_id, ""),
+                    can_play=False,
+                    can_expand=True,
+                )
+                for folder_id, config in folders.items()
+                if config.get("enabled", True)
+            ]
+
+            return BrowseMedia(
+                title="Media Folders",
+                media_class=MediaClass.DIRECTORY,
+                media_content_type=MediaType.MUSIC,
+                media_content_id="",
+                can_play=False,
+                can_expand=True,
+                children=children,
+            )
+
+        # Browse specific folder
+        folder_id, path = self._decode_media_id(media_content_id)
+
+        if not folder_id:
+            raise ValueError("Invalid media_content_id format")
+
+        # Get folder contents from API
+        browse_data = await self.coordinator.client.browse_folder(folder_id, path, offset=0, limit=1000)
+
+        children = []
+        for item in browse_data.get("items", []):
+            if item["type"] == "folder":
+                # Subfolder
+                item_path = f"{path}/{item['name']}" if path else item['name']
+                children.append(
+                    BrowseMedia(
+                        title=item["name"],
+                        media_class=MediaClass.DIRECTORY,
+                        media_content_type=MediaType.MUSIC,
+                        media_content_id=self._encode_media_id(folder_id, item_path),
+                        can_play=False,
+                        can_expand=True,
+                    )
+                )
+            elif item.get("is_media", False):
+                # Media file
+                # Build absolute path for playback
+                folders = await self.coordinator.client.get_media_folders()
+                base_path = folders[folder_id]["path"]
+                file_path_in_folder = f"{path}/{item['name']}" if path else item['name']
+                # Handle platform path separators
+                separator = '\\' if '\\' in base_path else '/'
+                # Ensure base_path doesn't end with separator to avoid double separators
+                base_path_clean = base_path.rstrip('/\\')
+                absolute_path = f"{base_path_clean}{separator}{file_path_in_folder.replace('/', separator)}"
+
+                children.append(
+                    BrowseMedia(
+                        title=item["name"],
+                        media_class=MediaClass.MUSIC,
+                        media_content_type=MediaType.MUSIC,
+                        media_content_id=absolute_path,  # Use absolute path as ID for playback
+                        can_play=True,
+                        can_expand=False,
+                    )
+                )
+
+        # Get current folder label
+        current_title = path.split("/")[-1] if path else browse_data.get("label", folder_id)
+
+        return BrowseMedia(
+            title=current_title,
+            media_class=MediaClass.DIRECTORY,
+            media_content_type=MediaType.MUSIC,
+            media_content_id=media_content_id,
+            can_play=False,
+            can_expand=True,
+            children=children,
+        )
+
+    async def async_play_media(
+        self, media_type: str, media_id: str, **kwargs: Any
+    ) -> None:
+        """Play a media file.
+
+        Args:
+            media_type: Type of media (unused)
+            media_id: Absolute file path to media file
+            **kwargs: Additional arguments (unused)
+        """
+        _LOGGER.debug("Play media: type=%s, id=%s", media_type, media_id)
+
+        try:
+            # media_id is the absolute file path from browse_media
+            await self.coordinator.client.play_media_file(media_id)
+
+            # Request immediate status update
+            await self.coordinator.async_request_refresh()
+        except MediaServerError as err:
+            _LOGGER.error("Failed to play media file: %s", err)