diff --git a/src/analyzers/commit_pattern.py b/src/analyzers/commit_pattern.py
index 7d1d891..22e625a 100644
--- a/src/analyzers/commit_pattern.py
+++ b/src/analyzers/commit_pattern.py
@@ -1,79 +1,63 @@
 from collections import defaultdict
-from datetime import datetime
-from typing import Dict, List
+from dataclasses import dataclass
+from typing import Dict, List, Optional
 
 from src.analyzers.git_repository import GitRepository
-from src.models import Author, CommitAnalysis
+from src.models.data_structures import CommitAnalysis
 
 
+@dataclass
 class CommitPatternAnalyzer:
-    """Analyze commit patterns and statistics."""
+    """Analyzes commit patterns."""
 
-    def __init__(
-        self,
-        repo: GitRepository,
-        days: int = 30,
-    ) -> None:
-        """Initialize CommitPatternAnalyzer."""
-        self.repo = repo
-        self.days = days
+    repo: GitRepository
+    days: int
 
-    def analyze(self) -> CommitAnalysis:
+    def analyze(self) -> Optional[CommitAnalysis]:
         """Analyze commit patterns."""
-        commits = self.repo.get_commits(since_days=self.days)
+        commits = self.repo.get_commits()
 
         if not commits:
-            return CommitAnalysis()
+            return None
 
-        authors = defaultdict(lambda: {"count": 0, "lines_added": 0, "lines_deleted": 0})
+        commits_by_hour: Dict[str, int] = defaultdict(int)
+        commits_by_day: Dict[str, int] = defaultdict(int)
+        commits_by_week: Dict[str, int] = defaultdict(int)
 
-        commits_by_hour = defaultdict(int)
-        commits_by_day = defaultdict(int)
-        commits_by_week = defaultdict(int)
-        commits_by_month = defaultdict(int)
+        author_commits: Dict[str, List[str]] = defaultdict(list)
 
         for commit in commits:
-            hour = commit.author_datetime.strftime("%H:00")
-            day = commit.author_datetime.strftime("%A")
-            week = commit.author_datetime.strftime("%Y-W%W")
-            month = commit.author_datetime.strftime("%Y-%m")
+            hour_key = commit.timestamp.strftime("%H:00")
+            day_key = commit.timestamp.strftime("%A")
+            week_key = commit.timestamp.strftime("%Y-W%U")
 
-            commits_by_hour[hour] += 1
-            commits_by_day[day] += 1
-            commits_by_week[week] += 1
-            commits_by_month[month] += 1
+            commits_by_hour[hour_key] += 1
+            commits_by_day[day_key] += 1
+            commits_by_week[week_key] += 1
 
-            author_key = f"{commit.author_name} <{commit.author_email}>"
-            authors[author_key]["count"] += 1
-            authors[author_key]["lines_added"] += commit.additions
-            authors[author_key]["lines_deleted"] += commit.deletions
+            author_commits[commit.author_email].append(commit.sha)
 
-        top_authors = [
-            Author(
-                name=name.split(" <")[0],
-                email=name.split("<")[1].rstrip(">") if "<" in name else "",
-                commit_count=data["count"],
-                lines_added=data["lines_added"],
-                lines_deleted=data["lines_deleted"],
-            )
-            for name, data in sorted(
-                authors.items(),
-                key=lambda x: x[1]["count"],
-                reverse=True,
-            )[:10]
-        ]
+        authors = []
+        for email, commit_shas in author_commits.items():
+            author = self.repo.get_authors()
+            for a in author:
+                if a.email == email:
+                    a.commit_count = len(commit_shas)
+                    authors.append(a)
+                    break
 
-        unique_authors = len(authors)
-        total_commits = len(commits)
-        average_commits_per_day = total_commits / max(self.days, 1)
+        authors.sort(key=lambda a: a.commit_count, reverse=True)
+        top_authors = authors[:10]
+
+        total_days = max(1, self.days)
+        avg_commits_per_day = len(commits) / total_days
 
         return CommitAnalysis(
-            total_commits=total_commits,
-            unique_authors=unique_authors,
+            total_commits=len(commits),
+            unique_authors=len(authors),
             commits_by_hour=dict(commits_by_hour),
             commits_by_day=dict(commits_by_day),
             commits_by_week=dict(commits_by_week),
-            commits_by_month=dict(commits_by_month),
             top_authors=top_authors,
-            average_commits_per_day=average_commits_per_day,
+            average_commits_per_day=avg_commits_per_day,
         )