feat: added hooks for collection on append

music_kraken/objects/artwork.py

@@ -1,18 +1,14 @@
 from __future__ import annotations
 
-from typing import List, Optional, Dict, Tuple, Type, Union, TypedDict
+from typing import Dict, List, Optional, Set, Tuple, Type, TypedDict, Union
-
-from .collection import Collection
-from .metadata import (
-    Mapping as id3Mapping,
-    ID3Timestamp,
-    Metadata
-)
-from ..utils.string_processing import unify, hash_url
-
-from .parents import OuterProxy as Base
 
 from ..utils.config import main_settings
+from ..utils.string_processing import hash_url, unify
+from .collection import Collection
+from .metadata import ID3Timestamp
+from .metadata import Mapping as id3Mapping
+from .metadata import Metadata
+from .parents import OuterProxy as Base
 
 
 class ArtworkVariant(TypedDict):
@@ -23,7 +19,9 @@ class ArtworkVariant(TypedDict):
 
 
 class Artwork:
-    def __init__(self, *variants: List[ArtworkVariant]) -> None:
+    def __init__(self, *variants: List[ArtworkVariant], parent_artworks: Set[Artwork] = None) -> None:
+        self.parent_artworks: Set[Artwork] = parent_artworks or set()
+        
         self._variant_mapping: Dict[str, ArtworkVariant] = {}
 
         for variant in variants:
@@ -36,7 +34,7 @@ class Artwork:
     def append(self, url: str, width: int = main_settings["preferred_artwork_resolution"], height: int = main_settings["preferred_artwork_resolution"], **kwargs) -> None:
         if url is None:
             return
-        
+     
         self._variant_mapping[hash_url(url=url)] = {
             "url": url,
             "width": width,
@@ -44,21 +42,36 @@ class Artwork:
             "deviation": self._calculate_deviation(width, height),
         }
 
+    @property
+    def flat_empty(self) -> bool:
+        return len(self._variant_mapping.keys()) <= 0
+
+    def _get_best_from_list(self, artwork_variants: List[ArtworkVariant]) -> Optional[ArtworkVariant]:
+        return min(artwork_variants, key=lambda x: x["deviation"])
+
     @property
     def best_variant(self) -> ArtworkVariant:
-        if len(self._variant_mapping.keys()) <= 0:
+        if self.flat_empty:
-            return None
+            return self._get_best_from_list([parent.best_variant for parent in self.parent_artworks])
-        return min(self._variant_mapping.values(), key=lambda x: x["deviation"])
+        return self._get_best_from_list(self._variant_mapping.values())
 
     def get_variant_name(self, variant: ArtworkVariant) -> str:
         return f"artwork_{variant['width']}x{variant['height']}_{hash_url(variant['url']).replace('/', '_')}"
 
     def __merge__(self, other: Artwork, **kwargs) -> None:
+        self.parent_artworks.update(other.parent_artworks)
+
         for key, value in other._variant_mapping.items():
             if key not in self._variant_mapping:
                 self._variant_mapping[key] = value
 
+    def __hash__(self) -> int:
+        return id(self)
+
     def __eq__(self, other: Artwork) -> bool:
+        if hash(self) == hash(other):
+            return True
+
         if not isinstance(other, Artwork):
             return False
         return any(a == b for a, b in zip(self._variant_mapping.keys(), other._variant_mapping.keys()))

music_kraken/objects/collection.py

@@ -1,16 +1,44 @@
 from __future__ import annotations
 
-from collections import defaultdict
-from typing import TypeVar, Generic, Dict, Optional, Iterable, List, Iterator, Tuple, Generator, Union, Any, Set
 import copy
+from collections import defaultdict
+from dataclasses import dataclass
+from typing import (Any, Callable, Dict, Generator, Generic, Iterable,
+                    Iterator, List, Optional, Set, Tuple, TypeVar, Union)
 
-from .parents import OuterProxy
+from ..utils import BColors, object_trace, output
-from ..utils import object_trace
+from .parents import InnerData, OuterProxy
-from ..utils import output, BColors
 
 T = TypeVar('T', bound=OuterProxy)
 
 
+@dataclass
+class AppendHookArguments:
+    """
+    This class is used to store the arguments for the append hook.
+    The best explanation is with an examples:
+    
+    ```
+    # this is the action that triggers the append hook
+    album = Album()
+    song = Song()
+    album.song_collection.append(song)
+    ```
+
+    In this case, the append hook is triggered with the following arguments:
+    ```
+    AppendHookArguments(
+        collection=album.song_collection,
+        new_object=song,
+        collection_root_objects=[album]
+    )
+    ```
+    """
+
+    collection: Collection
+    new_object: T
+    collection_root_objects: Set[InnerData]
+
 class Collection(Generic[T]):
     __is_collection__ = True
 
@@ -27,6 +55,7 @@ class Collection(Generic[T]):
             sync_on_append: Dict[str, Collection] = None,
             append_object_to_attribute: Dict[str, T] = None,
             extend_object_to_attribute: Dict[str, Collection] = None,
+            append_callbacks: List[Callable[[AppendHookArguments], None]] = None,
     ) -> None:
         self._collection_for: dict = dict()
 
@@ -41,6 +70,7 @@ class Collection(Generic[T]):
         self.sync_on_append: Dict[str, Collection] = sync_on_append or {}
         self.pull_from: List[Collection] = []
         self.push_to: List[Collection] = []
+        self.append_callbacks: List[Callable[[AppendHookArguments], None]] = append_callbacks or []
 
         # This is to cleanly unmap previously mapped items by their id
         self._indexed_from_id: Dict[int, Dict[str, Any]] = defaultdict(dict)
@@ -141,6 +171,14 @@ class Collection(Generic[T]):
         for attribute, new_object in self.append_object_to_attribute.items():
             other.__getattribute__(attribute).append(new_object, **kwargs)
 
+        append_hook_args = AppendHookArguments(
+            collection=self,
+            new_object=other,
+            collection_root_objects=self._collection_for.keys(),
+        )
+        for callback in self.append_callbacks:
+            callback(append_hook_args)
+
     def append(self, other: Optional[T], **kwargs):
         """
         If an object, that represents the same entity exists in a relevant collection,