Implement upvote functionality for "+" messages

- Add UPVOTE_PREVIOUS pattern to match simple "+" messages
- Add get_conversation_messages method to retrieve message history
- Implement upvote_previous method to find and upvote previous non-command messages
- Integrate with existing karma system using collective vote mechanism
- Add comprehensive pattern tests

Fixes #7

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: konard

experiments/test_upvote_pattern.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""Test script for the new UPVOTE_PREVIOUS pattern."""
+import sys
+import os
+
+# Add python directory to path
+python_dir = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), 'python')
+sys.path.append(python_dir)
+
+from patterns import UPVOTE_PREVIOUS
+from regex import match
+
+def test_upvote_pattern():
+    """Test the UPVOTE_PREVIOUS pattern."""
+    
+    test_cases = [
+        # Should match
+        ("+", True),
+        (" + ", True),
+        (" +  ", True),
+        ("  +", True),
+        ("+  ", True),
+        
+        # Should not match
+        ("++", False),
+        ("+ hello", False),
+        ("hello +", False),
+        ("+5", False),
+        ("+-", False),
+        ("", False),
+        ("hello", False),
+    ]
+    
+    print("Testing UPVOTE_PREVIOUS pattern...")
+    
+    all_passed = True
+    for test_input, expected in test_cases:
+        result = bool(match(UPVOTE_PREVIOUS, test_input))
+        status = "PASS" if result == expected else "FAIL"
+        
+        if result != expected:
+            all_passed = False
+            
+        print(f"  '{test_input}' -> {result} (expected {expected}) [{status}]")
+    
+    print(f"\nOverall: {'PASS' if all_passed else 'FAIL'}")
+    return all_passed
+
+if __name__ == "__main__":
+    test_upvote_pattern()

python/__main__.py

@@ -63,6 +63,7 @@ def __init__(
             (patterns.WHAT_IS, self.commands.what_is),
             (patterns.WHAT_MEAN, self.commands.what_is),
             (patterns.APPLY_KARMA, self.commands.apply_karma),
+            (patterns.UPVOTE_PREVIOUS, self.commands.upvote_previous),
             (patterns.GITHUB_COPILOT, self.commands.github_copilot)
         )
 
@@ -198,6 +199,20 @@ def get_messages(
         reply_message = event.get("reply_message", {})
         return [reply_message] if reply_message else event.get("fwd_messages", [])
 
+    def get_conversation_messages(
+        self,
+        peer_id: int,
+        count: int = 10
+    ) -> List[Dict[str, Any]]:
+        """Returns recent messages from conversation.
+        """
+        response = self.call_method(
+            'messages.getHistory',
+            dict(peer_id=peer_id, count=count))
+        if "error" in response:
+            return []
+        return response["response"]["items"]
+
 
 if __name__ == '__main__':
     vk = Bot(token=BOT_TOKEN, group_id=config.BOT_GROUP_ID, debug=True)

python/modules/commands.py

@@ -379,6 +379,98 @@ def github_copilot(self) -> NoReturn:
             f'Пожалуйста, подождите {round(config.GITHUB_COPILOT_TIMEOUT - (now - self.now))} секунд', self.peer_id
         )
 
+    def upvote_previous(self) -> NoReturn:
+        """Upvotes the previous non-command message."""
+        if self.peer_id < 2e9 or not self.karma_enabled:
+            return
+
+        # Get recent conversation messages
+        recent_messages = self.vk_instance.get_conversation_messages(self.peer_id, 20)
+        
+        # Find the previous non-command message
+        current_msg_found = False
+        for message in recent_messages:
+            # Skip until we find current message
+            if not current_msg_found:
+                if message["conversation_message_id"] == self.msg_id:
+                    current_msg_found = True
+                continue
+            
+            # Skip messages from bots or system
+            if message["from_id"] <= 0:
+                continue
+                
+            message_text = message["text"].lstrip("/")
+            
+            # Check if this message matches any command pattern
+            is_command = False
+            for cmd_pattern in Commands.cmds.keys():
+                if match(cmd_pattern, message_text):
+                    is_command = True
+                    break
+            
+            # If not a command, this is our target message
+            if not is_command and message_text.strip():
+                target_user_id = message["from_id"]
+                target_user = self.data_service.get_user(target_user_id, self.vk_instance)
+                
+                # Don't allow self-upvote
+                if target_user_id == self.from_id:
+                    self.vk_instance.send_msg(
+                        'Нельзя голосовать за свои сообщения.', self.peer_id)
+                    return
+                
+                # Apply upvote (equivalent to +0 karma - collective vote)
+                self.user = target_user
+                utcnow = datetime.utcnow()
+                
+                # Check if already voted for this user
+                if self.current_user.uid in target_user.supporters:
+                    self.vk_instance.send_msg(
+                        (f'Вы уже голосовали за [id{target_user.uid}|'
+                         f'{self.vk_instance.get_user_name(target_user.uid, "acc")}].'),
+                        self.peer_id
+                    )
+                    return
+                
+                # Check collective vote time limit
+                utclast = datetime.fromtimestamp(
+                    float(self.current_user.last_collective_vote))
+                difference = utcnow - utclast
+                hours_difference = difference.total_seconds() / 3600
+                hours_limit = karma_limit(self.current_user.karma)
+                
+                if hours_difference < hours_limit:
+                    self.vk_instance.delete_message(self.peer_id, self.msg_id)
+                    self.vk_instance.send_msg(
+                        CommandsBuilder.build_not_enough_hours(
+                            self.current_user, self.data_service,
+                            hours_limit, difference.total_seconds() / 60),
+                        self.peer_id)
+                    return
+                
+                # Apply the upvote
+                user_karma_change, selected_user_karma_change, collective_vote_applied, voters = self.apply_karma_change(
+                    "+", 0)
+                
+                if collective_vote_applied:
+                    self.current_user.last_collective_vote = int(utcnow.timestamp())
+                    self.data_service.save_user(self.current_user)
+                
+                if user_karma_change:
+                    self.data_service.save_user(target_user)
+                
+                self.vk_instance.send_msg(
+                    CommandsBuilder.build_karma_change(
+                        user_karma_change, selected_user_karma_change, voters),
+                    self.peer_id)
+                self.vk_instance.delete_message(self.peer_id, self.msg_id)
+                return
+        
+        # No previous non-command message found
+        self.vk_instance.send_msg(
+            'Не найдено предыдущее сообщение для голосования.', self.peer_id)
+
     def match_command(
             self,
             pattern: Pattern

python/patterns.py

@@ -65,3 +65,6 @@
 GITHUB_COPILOT = recompile(
     r'\A\s*(code|код)\s+(?P<lang>(' + COPILOT_LANGUAGES +
     r'))(?P<text>[\S\s]+)\Z', IGNORECASE)
+
+UPVOTE_PREVIOUS = recompile(
+    r'\A\s*\+\s*\Z', IGNORECASE)