feat: get signup year in the least shitty way possible

stats.py

@@ -2,6 +2,7 @@
 """Stats playground for Audible TUI - get your listening stats"""
 
 import logging
+from datetime import date
 from getpass import getpass
 from pathlib import Path
 
@@ -12,6 +13,8 @@ logging.basicConfig(level=logging.INFO, format="%(message)s")
 logger = logging.getLogger(__name__)
 
 logging.getLogger("audible").setLevel(logging.WARNING)
+logging.getLogger("httpx").setLevel(logging.WARNING)
+logging.getLogger("httpcore").setLevel(logging.WARNING)
 
 
 class AudibleStats:
@@ -48,12 +51,62 @@ class AudibleStats:
         self.auth.to_file(str(auth_path))
         self.client = audible.Client(auth=self.auth)
 
+    def get_signup_year(self) -> int:
+        """Get signup year by checking activity in each month, each year."""
+        current_year = date.today().year
+        start_year = 1995
+
+        try:
+            stats = self.client.get(
+                "1.0/stats/aggregates",
+                monthly_listening_interval_duration="12",
+                monthly_listening_interval_start_date=f"{current_year}-01",
+                store="Audible",
+            )
+            monthly_stats = stats.get("aggregated_monthly_listening_stats", [])
+            if not monthly_stats or not any(
+                stat.get("aggregated_sum", 0) > 0 for stat in monthly_stats
+            ):
+                logger.warning("Could not determine signup year")
+                return 0
+        except Exception:
+            logger.warning("Could not determine signup year")
+            return 0
+
+        left, right = start_year, current_year
+        earliest_year = current_year
+
+        while left <= right:
+            middle = (left + right) // 2
+            try:
+                stats = self.client.get(
+                    "1.0/stats/aggregates",
+                    monthly_listening_interval_duration="12",
+                    monthly_listening_interval_start_date=f"{middle}-01",
+                    store="Audible",
+                )
+                monthly_stats = stats.get("aggregated_monthly_listening_stats", [])
+                has_activity = bool(
+                    monthly_stats
+                    and any(stat.get("aggregated_sum", 0) > 0 for stat in monthly_stats)
+                )
+            except Exception:
+                has_activity = False
+
+            if has_activity:
+                earliest_year = middle
+                right = middle - 1
+            else:
+                left = middle + 1
+
+        return earliest_year
+
 
 def main() -> None:
     """Main entry point."""
     worker = AudibleStats()
     worker.authenticate()
-    print(worker.get_stats())  # TBD
+    print(worker.get_signup_year())
 
 
 if __name__ == "__main__":