[scrobbles] Add dynamic forms for LogData classes

vrobbler/apps/books/models.py

@@ -1,7 +1,7 @@
 from collections import OrderedDict
 from dataclasses import dataclass
 import logging
-from datetime import timedelta, datetime
+from datetime import datetime
 from typing import Optional
 from uuid import uuid4
 
@@ -22,7 +22,6 @@ from scrobbles.mixins import (
     LongPlayScrobblableMixin,
     ObjectWithGenres,
     ScrobblableConstants,
-    ScrobblableMixin,
 )
 from scrobbles.utils import get_scrobbles_for_media
 from taggit.managers import TaggableManager
@@ -64,6 +63,16 @@ class BookLogData(BaseLogData, LongPlayLogData):
     page_start: Optional[int] = None
     page_end: Optional[int] = None
 
+    _excluded_fields = {"koreader_hash", "page_data"}
+
+    def avg_seconds_per_page(self):
+        if self.page_data:
+            total_duration = 0
+            for page_num, stats in self.page_data.items():
+                total_duration += stats.get("duration", 0)
+            if total_duration:
+                return int(total_duration / len(self.page_data))
+
 
 class Author(TimeStampedModel):
     name = models.CharField(max_length=255)