feat: Standardize SerieList to use key as primary identifier (Task 1.2)

- Renamed folderDict to keyDict for clarity
- Updated internal storage to use serie.key instead of serie.folder
- Optimized contains() from O(n) to O(1) with direct key lookup
- Added get_by_key() as primary lookup method
- Added get_by_folder() for backward compatibility
- Enhanced docstrings to clarify key vs folder usage
- Created comprehensive test suite (12 tests, all passing)
- Verified no breaking changes (16 SeriesApp tests pass)

This establishes key as the single source of truth for series
identification while maintaining folder as metadata for filesystem
operations only.

instructions.md

@@ -226,11 +226,11 @@ conda run -n AniWorld python -m pytest tests/unit/test_anime_models.py -v
 
 **Success Criteria:**
 
--   [ ] Internal dictionary keyed by `serie.key`
+-   [x] Internal dictionary keyed by `serie.key`
--   [ ] `add()`, `contains()`, `GetList()` work correctly
+-   [x] `add()`, `contains()`, `GetList()` work correctly
--   [ ] Helper methods `get_by_key()` and `get_by_folder()` implemented
+-   [x] Helper methods `get_by_key()` and `get_by_folder()` implemented
--   [ ] All existing tests pass
+-   [x] All existing tests pass
--   [ ] No breaking changes to public API
+-   [x] No breaking changes to public API
 
 **Test Command:**
 
@@ -238,6 +238,29 @@ conda run -n AniWorld python -m pytest tests/unit/test_anime_models.py -v
 conda run -n AniWorld python -m pytest tests/unit/ -k "SerieList" -v
 ```
 
+**Status:** ✅ COMPLETED
+
+**Implementation Details:**
+
+-   Renamed `self.folderDict` to `self.keyDict` for clarity
+-   Updated internal storage to use `serie.key` as dictionary key
+-   Modified `add()` method to store series by key: `self.keyDict[serie.key] = serie`
+-   Optimized `contains()` method to use direct dictionary lookup: `return key in self.keyDict`
+-   Updated `_load_data()` to store loaded series by key with enhanced logging
+-   All methods (`GetMissingEpisode()`, `GetList()`, etc.) now iterate over `self.keyDict.values()`
+-   Added `get_by_key(key: str) -> Optional[Serie]` as primary lookup method
+-   Added `get_by_folder(folder: str) -> Optional[Serie]` for backward compatibility
+-   Created comprehensive test suite in `tests/unit/test_serie_list.py` with 12 tests covering:
+    -   Key-based storage initialization
+    -   Add, contains, and retrieval operations
+    -   Duplicate prevention by key
+    -   Helper method functionality (get_by_key, get_by_folder)
+    -   Public API compatibility
+    -   File loading and persistence
+-   All 12 new tests pass successfully
+-   All 16 SeriesApp tests pass, confirming no breaking changes
+-   Enhanced docstrings to clarify `key` as identifier and `folder` as metadata
+
 ---
 
 #### Task 1.3: Update SerieScanner to Use Key Consistently

src/core/entities/SerieList.py

@@ -3,22 +3,35 @@
 import logging
 import os
 from json import JSONDecodeError
-from typing import Dict, Iterable, List
+from typing import Dict, Iterable, List, Optional
 
 from src.core.entities.series import Serie
 
 
 class SerieList:
-    """Represents the collection of cached series stored on disk."""
+    """
+    Represents the collection of cached series stored on disk.
+    
+    Series are identified by their unique 'key' (provider identifier).
+    The 'folder' is metadata only and not used for lookups.
+    """
 
     def __init__(self, base_path: str) -> None:
         self.directory: str = base_path
-        self.folderDict: Dict[str, Serie] = {}
+        # Internal storage using serie.key as the dictionary key
+        self.keyDict: Dict[str, Serie] = {}
         self.load_series()
 
     def add(self, serie: Serie) -> None:
-        """Persist a new series if it is not already present."""
+        """
-
+        Persist a new series if it is not already present.
+        
+        Uses serie.key for identification. The serie.folder is used for
+        filesystem operations only.
+        
+        Args:
+            serie: The Serie instance to add
+        """
         if self.contains(serie.key):
             return
 
@@ -27,12 +40,20 @@ class SerieList:
         os.makedirs(anime_path, exist_ok=True)
         if not os.path.isfile(data_path):
             serie.save_to_file(data_path)
-            self.folderDict[serie.folder] = serie
+            # Store by key, not folder
+            self.keyDict[serie.key] = serie
 
     def contains(self, key: str) -> bool:
-        """Return True when a series identified by ``key`` already exists."""
+        """
-
+        Return True when a series identified by ``key`` already exists.
-        return any(value.key == key for value in self.folderDict.values())
+        
+        Args:
+            key: The unique provider identifier for the series
+            
+        Returns:
+            True if the series exists in the collection
+        """
+        return key in self.keyDict
 
     def load_series(self) -> None:
         """Populate the in-memory map with metadata discovered on disk."""
@@ -61,11 +82,22 @@ class SerieList:
             )
 
     def _load_data(self, anime_folder: str, data_path: str) -> None:
-        """Load a single series metadata file into the in-memory collection."""
+        """
-
+        Load a single series metadata file into the in-memory collection.
+        
+        Args:
+            anime_folder: The folder name (for logging only)
+            data_path: Path to the metadata file
+        """
         try:
-            self.folderDict[anime_folder] = Serie.load_from_file(data_path)
+            serie = Serie.load_from_file(data_path)
-            logging.debug("Successfully loaded metadata for %s", anime_folder)
+            # Store by key, not folder
+            self.keyDict[serie.key] = serie
+            logging.debug(
+                "Successfully loaded metadata for %s (key: %s)",
+                anime_folder,
+                serie.key
+            )
         except (OSError, JSONDecodeError, KeyError, ValueError) as error:
             logging.error(
                 "Failed to load metadata for folder %s from %s: %s",
@@ -76,24 +108,52 @@ class SerieList:
 
     def GetMissingEpisode(self) -> List[Serie]:
         """Return all series that still contain missing episodes."""
-
         return [
             serie
-            for serie in self.folderDict.values()
+            for serie in self.keyDict.values()
             if serie.episodeDict
         ]
 
     def get_missing_episodes(self) -> List[Serie]:
         """PEP8-friendly alias for :meth:`GetMissingEpisode`."""
-
         return self.GetMissingEpisode()
 
     def GetList(self) -> List[Serie]:
         """Return all series instances stored in the list."""
-
+        return list(self.keyDict.values())
-        return list(self.folderDict.values())
 
     def get_all(self) -> List[Serie]:
         """PEP8-friendly alias for :meth:`GetList`."""
-
         return self.GetList()
+    
+    def get_by_key(self, key: str) -> Optional[Serie]:
+        """
+        Get a series by its unique provider key.
+        
+        This is the primary method for series lookup.
+        
+        Args:
+            key: The unique provider identifier (e.g., "attack-on-titan")
+            
+        Returns:
+            The Serie instance if found, None otherwise
+        """
+        return self.keyDict.get(key)
+    
+    def get_by_folder(self, folder: str) -> Optional[Serie]:
+        """
+        Get a series by its folder name.
+        
+        This method is provided for backward compatibility only.
+        Prefer using get_by_key() for new code.
+        
+        Args:
+            folder: The filesystem folder name (e.g., "Attack on Titan (2013)")
+            
+        Returns:
+            The Serie instance if found, None otherwise
+        """
+        for serie in self.keyDict.values():
+            if serie.folder == folder:
+                return serie
+        return None

tests/unit/test_serie_list.py

@@ -0,0 +1,203 @@
+"""Tests for SerieList class - identifier standardization."""
+
+import os
+import tempfile
+
+import pytest
+
+from src.core.entities.SerieList import SerieList
+from src.core.entities.series import Serie
+
+
+@pytest.fixture
+def temp_directory():
+    """Create a temporary directory for testing."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        yield tmpdir
+
+
+@pytest.fixture
+def sample_serie():
+    """Create a sample Serie for testing."""
+    return Serie(
+        key="attack-on-titan",
+        name="Attack on Titan",
+        site="https://aniworld.to/anime/stream/attack-on-titan",
+        folder="Attack on Titan (2013)",
+        episodeDict={1: [1, 2, 3]}
+    )
+
+
+class TestSerieListKeyBasedStorage:
+    """Test SerieList uses key for internal storage."""
+
+    def test_init_creates_empty_keydict(self, temp_directory):
+        """Test initialization creates keyDict."""
+        serie_list = SerieList(temp_directory)
+        assert hasattr(serie_list, 'keyDict')
+        assert isinstance(serie_list.keyDict, dict)
+
+    def test_add_stores_by_key(self, temp_directory, sample_serie):
+        """Test add() stores series by key."""
+        serie_list = SerieList(temp_directory)
+        serie_list.add(sample_serie)
+        
+        # Verify stored by key, not folder
+        assert sample_serie.key in serie_list.keyDict
+        assert serie_list.keyDict[sample_serie.key] == sample_serie
+
+    def test_contains_checks_by_key(self, temp_directory, sample_serie):
+        """Test contains() checks by key."""
+        serie_list = SerieList(temp_directory)
+        serie_list.add(sample_serie)
+        
+        assert serie_list.contains(sample_serie.key)
+        assert not serie_list.contains("nonexistent-key")
+
+    def test_add_prevents_duplicates_by_key(
+        self, temp_directory, sample_serie
+    ):
+        """Test add() prevents duplicates based on key."""
+        serie_list = SerieList(temp_directory)
+        
+        # Add same serie twice
+        serie_list.add(sample_serie)
+        initial_count = len(serie_list.keyDict)
+        
+        serie_list.add(sample_serie)
+        
+        # Should still have only one entry
+        assert len(serie_list.keyDict) == initial_count
+        assert len(serie_list.keyDict) == 1
+
+    def test_get_by_key_returns_correct_serie(
+        self, temp_directory, sample_serie
+    ):
+        """Test get_by_key() retrieves series correctly."""
+        serie_list = SerieList(temp_directory)
+        serie_list.add(sample_serie)
+        
+        result = serie_list.get_by_key(sample_serie.key)
+        assert result is not None
+        assert result.key == sample_serie.key
+        assert result.name == sample_serie.name
+
+    def test_get_by_key_returns_none_for_missing(self, temp_directory):
+        """Test get_by_key() returns None for nonexistent key."""
+        serie_list = SerieList(temp_directory)
+        
+        result = serie_list.get_by_key("nonexistent-key")
+        assert result is None
+
+    def test_get_by_folder_backward_compatibility(
+        self, temp_directory, sample_serie
+    ):
+        """Test get_by_folder() provides backward compatibility."""
+        serie_list = SerieList(temp_directory)
+        serie_list.add(sample_serie)
+        
+        result = serie_list.get_by_folder(sample_serie.folder)
+        assert result is not None
+        assert result.key == sample_serie.key
+        assert result.folder == sample_serie.folder
+
+    def test_get_by_folder_returns_none_for_missing(self, temp_directory):
+        """Test get_by_folder() returns None for nonexistent folder."""
+        serie_list = SerieList(temp_directory)
+        
+        result = serie_list.get_by_folder("Nonexistent Folder")
+        assert result is None
+
+    def test_get_all_returns_all_series(self, temp_directory, sample_serie):
+        """Test get_all() returns all series from keyDict."""
+        serie_list = SerieList(temp_directory)
+        serie_list.add(sample_serie)
+        
+        serie2 = Serie(
+            key="naruto",
+            name="Naruto",
+            site="https://aniworld.to/anime/stream/naruto",
+            folder="Naruto (2002)",
+            episodeDict={1: [1, 2]}
+        )
+        serie_list.add(serie2)
+        
+        all_series = serie_list.get_all()
+        assert len(all_series) == 2
+        assert sample_serie in all_series
+        assert serie2 in all_series
+
+    def test_get_missing_episodes_filters_by_episode_dict(
+        self, temp_directory
+    ):
+        """Test get_missing_episodes() returns only series with episodes."""
+        serie_list = SerieList(temp_directory)
+        
+        # Serie with missing episodes
+        serie_with_episodes = Serie(
+            key="serie-with-episodes",
+            name="Serie With Episodes",
+            site="https://aniworld.to/anime/stream/serie-with-episodes",
+            folder="Serie With Episodes (2020)",
+            episodeDict={1: [1, 2, 3]}
+        )
+        
+        # Serie without missing episodes
+        serie_without_episodes = Serie(
+            key="serie-without-episodes",
+            name="Serie Without Episodes",
+            site="https://aniworld.to/anime/stream/serie-without-episodes",
+            folder="Serie Without Episodes (2021)",
+            episodeDict={}
+        )
+        
+        serie_list.add(serie_with_episodes)
+        serie_list.add(serie_without_episodes)
+        
+        missing = serie_list.get_missing_episodes()
+        assert len(missing) == 1
+        assert serie_with_episodes in missing
+        assert serie_without_episodes not in missing
+
+    def test_load_series_stores_by_key(self, temp_directory, sample_serie):
+        """Test load_series() stores series by key when loading from disk."""
+        # Create directory structure and save serie
+        folder_path = os.path.join(temp_directory, sample_serie.folder)
+        os.makedirs(folder_path, exist_ok=True)
+        data_path = os.path.join(folder_path, "data")
+        sample_serie.save_to_file(data_path)
+        
+        # Create new SerieList (triggers load_series in __init__)
+        serie_list = SerieList(temp_directory)
+        
+        # Verify loaded by key
+        assert sample_serie.key in serie_list.keyDict
+        loaded_serie = serie_list.keyDict[sample_serie.key]
+        assert loaded_serie.key == sample_serie.key
+        assert loaded_serie.name == sample_serie.name
+
+
+class TestSerieListPublicAPI:
+    """Test that public API still works correctly."""
+
+    def test_public_methods_work(self, temp_directory, sample_serie):
+        """Test that all public methods work correctly after refactoring."""
+        serie_list = SerieList(temp_directory)
+        
+        # Test add
+        serie_list.add(sample_serie)
+        
+        # Test contains
+        assert serie_list.contains(sample_serie.key)
+        
+        # Test GetList/get_all
+        assert len(serie_list.GetList()) == 1
+        assert len(serie_list.get_all()) == 1
+        
+        # Test GetMissingEpisode/get_missing_episodes
+        assert len(serie_list.GetMissingEpisode()) == 1
+        assert len(serie_list.get_missing_episodes()) == 1
+        
+        # Test new helper methods
+        assert serie_list.get_by_key(sample_serie.key) is not None
+        assert serie_list.get_by_folder(sample_serie.folder) is not None