models for recurring tasks

src/tt/db.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timedelta
 from enum import Enum
 from peewee import (
     BooleanField,
@@ -8,6 +8,7 @@ from peewee import (
     Model,
     SqliteDatabase,
     TextField,
+    JSONField,
 )
 
 db = SqliteDatabase(
@@ -68,9 +69,50 @@ class SavedSearch(BaseModel):
         return self.name
 
 
+class TaskGenerator(Model):
+    template = CharField()
+    type = CharField()
+    config = JSONField()
+    deleted = BooleanField(default=False)
+    last_generated_at = DateTimeField(null=True)
+    created_at = DateTimeField(default=datetime.now)
+
+    def should_generate(self) -> bool:
+        """
+        generator types: config keys
+            recurring: days_between
+            monthly: day_of_month
+        """
+        if self.deleted:
+            return False
+        if not self.last_generated_at:
+            return True
+
+        now = datetime.now()
+        if self.type == "recurring":
+            days_between = self.config["days_between"]
+            days_since = (now - self.last_generated_at).days
+            return days_since >= days_between
+
+        elif self.type == "monthly":
+            day_of_month = self.generator_config["day_of_month"]
+
+            # check each day until now to see if target day occurred
+            one_day = timedelta(days=1)
+            check_date = self.last_generated_at + one_day
+            while check_date <= now:
+                if check_date.day == day_of_month:
+                    return True
+                check_date += one_day
+
+            return False
+
+        return False
+
+
 def initialize_db():
     db.connect()
-    db.create_tables([Category, Task, SavedSearch])
+    db.create_tables([Category, Task, SavedSearch, TaskGenerator])
     if not Category.select().exists():
         Category.create(name="default")
     db.close()