fix: improve PR patch decoding and clean up Bitbucket provider code

- Add fallback encodings for PR patch decoding to handle non-UTF-8 encodings.
- Update logging messages for better clarity.
- Remove unnecessary blank lines and fix minor formatting issues.
- Ensure full files are retrieved in `get_diff_files` method.

pr_agent/git_providers/bitbucket_provider.py

@@ -121,7 +121,7 @@ def publish_file_comments(self, file_comments: list) -> bool:
 
     def is_supported(self, capability: str) -> bool:
         if capability in ['get_issue_comments', 'publish_inline_comments', 'get_labels', 'gfm_markdown',
-                            'publish_file_comments']:
+                          'publish_file_comments']:
             return False
         return True
 
@@ -142,7 +142,6 @@ def get_files(self):
                 self.git_files = [_gef_filename(diff) for diff in self.pr.diffstat()]
             return self.git_files
 
-
     def get_diff_files(self) -> list[FilePatchInfo]:
         if self.diff_files:
             return self.diff_files
@@ -164,8 +163,25 @@ def get_diff_files(self) -> list[FilePatchInfo]:
                 pass
 
         # get the pr patches
-        pr_patch = self.pr.diff()
-        diff_split = ["diff --git" + x for x in pr_patch.split("diff --git") if x.strip()]
+        try:
+            pr_patches = self.pr.diff()
+        except Exception as e:
+            # Try different encodings if UTF-8 fails
+            get_logger().warning(f"Failed to decode PR patch with utf-8, error: {e}")
+            encodings_to_try = ['iso-8859-1', 'latin-1', 'ascii', 'utf-16']
+            pr_patches = None
+            for encoding in encodings_to_try:
+                try:
+                    pr_patches = self.pr.diff(encoding=encoding)
+                    get_logger().info(f"Successfully decoded PR patch with encoding {encoding}")
+                    break
+                except UnicodeDecodeError:
+                    continue
+
+            if pr_patches is None:
+                raise ValueError(f"Failed to decode PR patch with encodings {encodings_to_try}")
+
+        diff_split = ["diff --git" + x for x in pr_patches.split("diff --git") if x.strip()]
         # filter all elements of 'diff_split' that are of indices in 'diffs_original' that are not in 'diffs'
         if len(diff_split) > len(diffs) and len(diffs_original) == len(diff_split):
             diff_split = [diff_split[i] for i in range(len(diff_split)) if diffs_original[i] in diffs]
@@ -196,12 +212,13 @@ def get_diff_files(self) -> list[FilePatchInfo]:
                     diff_split[i] = ""
                     get_logger().info(f"Disregarding empty diff for file {_gef_filename(diffs[i])}")
                 else:
-                    get_logger().error(f"Error - failed to get diff for file {_gef_filename(diffs[i])}")
+                    get_logger().warning(f"Bitbucket failed to get diff for file {_gef_filename(diffs[i])}")
                     diff_split[i] = ""
 
         invalid_files_names = []
         diff_files = []
         counter_valid = 0
+        # get full files
         for index, diff in enumerate(diffs):
             file_path = _gef_filename(diff)
             if not is_valid_file(file_path):
@@ -316,11 +333,13 @@ def remove_comment(self, comment):
             get_logger().exception(f"Failed to remove comment, error: {e}")
 
     # function to create_inline_comment
-    def create_inline_comment(self, body: str, relevant_file: str, relevant_line_in_file: str, absolute_position: int = None):
+    def create_inline_comment(self, body: str, relevant_file: str, relevant_line_in_file: str,
+                              absolute_position: int = None):
         body = self.limit_output_characters(body, self.max_comment_length)
         position, absolute_position = find_line_number_of_relevant_line_in_file(self.get_diff_files(),
-                                                                            relevant_file.strip('`'),
-                                                                            relevant_line_in_file, absolute_position)
+                                                                                relevant_file.strip('`'),
+                                                                                relevant_line_in_file,
+                                                                                absolute_position)
         if position == -1:
             if get_settings().config.verbosity_level >= 2:
                 get_logger().info(f"Could not find position for {relevant_file} {relevant_line_in_file}")
@@ -330,10 +349,9 @@ def create_inline_comment(self, body: str, relevant_file: str, relevant_line_in_
         path = relevant_file.strip()
         return dict(body=body, path=path, position=absolute_position) if subject_type == "LINE" else {}
 
-
     def publish_inline_comment(self, comment: str, from_line: int, file: str, original_suggestion=None):
         comment = self.limit_output_characters(comment, self.max_comment_length)
-        payload = json.dumps( {
+        payload = json.dumps({
             "content": {
                 "raw": comment,
             },
@@ -378,10 +396,10 @@ def publish_inline_comments(self, comments: list[dict]):
         for comment in comments:
             if 'position' in comment:
                 self.publish_inline_comment(comment['body'], comment['position'], comment['path'])
-            elif 'start_line' in comment: # multi-line comment
+            elif 'start_line' in comment:  # multi-line comment
                 # note that bitbucket does not seem to support range - only a comment on a single line - https://community.developer.atlassian.com/t/api-post-endpoint-for-inline-pull-request-comments/60452
                 self.publish_inline_comment(comment['body'], comment['start_line'], comment['path'])
-            elif 'line' in comment: # single-line comment
+            elif 'line' in comment:  # single-line comment
                 self.publish_inline_comment(comment['body'], comment['line'], comment['path'])
             else:
                 get_logger().error(f"Could not publish inline comment {comment}")
@@ -465,20 +483,19 @@ def get_pr_file_content(self, file_path: str, branch: str) -> str:
         except Exception:
             return ""
 
-
     def create_or_update_pr_file(self, file_path: str, branch: str, contents="", message="") -> None:
         url = (f"https://api.bitbucket.org/2.0/repositories/{self.workspace_slug}/{self.repo_slug}/src/")
         if not message:
             if contents:
                 message = f"Update {file_path}"
             else:
                 message = f"Create {file_path}"
-        files={file_path: contents}
-        data={
+        files = {file_path: contents}
+        data = {
             "message": message,
             "branch": branch
         }
-        headers = {'Authorization':self.headers['Authorization']} if 'Authorization' in self.headers else {}
+        headers = {'Authorization': self.headers['Authorization']} if 'Authorization' in self.headers else {}
         try:
             requests.request("POST", url, headers=headers, data=data, files=files)
         except Exception:
@@ -503,7 +520,7 @@ def publish_description(self, pr_title: str, description: str):
             "description": description,
             "title": pr_title
 
-            })
+        })
 
         response = requests.request("PUT", self.bitbucket_pull_request_api_url, headers=self.headers, data=payload)
         try: