feat：优化重复思考，表情现在一次选所有且可配置

src/maisaka/builtin_tool/send_emoji.py

@@ -2,6 +2,7 @@
 
 from datetime import datetime
 from io import BytesIO
+import math
 from random import sample
 from typing import Any, Dict, Optional
 
@@ -16,6 +17,7 @@ from src.chat.emoji_system.maisaka_tool import send_emoji_for_maisaka
 from src.common.data_models.image_data_model import MaiEmoji
 from src.common.data_models.message_component_data_model import ImageComponent, MessageSequence, TextComponent
 from src.common.logger import get_logger
+from src.config.config import global_config
 from src.core.tooling import ToolExecutionContext, ToolExecutionResult, ToolInvocation, ToolSpec
 from src.llm_models.payload_content.resp_format import RespFormat, RespFormatType
 from src.maisaka.context_messages import (
@@ -31,7 +33,7 @@ logger = get_logger("maisaka_builtin_send_emoji")
 
 _EMOJI_SUB_AGENT_CONTEXT_LIMIT = 12
 _EMOJI_SUB_AGENT_MAX_TOKENS = 240
-_EMOJI_CANDIDATE_COUNT = 25
+_EMOJI_MAX_CANDIDATE_COUNT = 64
 _EMOJI_CANDIDATE_TILE_SIZE = 256
 _EMOJI_SUCCESS_MESSAGE = "表情包发送成功"
 
@@ -70,6 +72,36 @@ async def _load_emoji_bytes(emoji: MaiEmoji) -> bytes:
     return await asyncio.to_thread(emoji.full_path.read_bytes)
 
 
+def _get_emoji_candidate_count() -> int:
+    """获取本次表情包候选数量配置。"""
+
+    configured_count = int(getattr(global_config.emoji, "emoji_send_num", 25))
+    return max(1, min(configured_count, _EMOJI_MAX_CANDIDATE_COUNT))
+
+
+def _calculate_grid_shape(candidate_count: int) -> tuple[int, int]:
+    """根据候选数量计算尽量接近矩形的拼图行列数。"""
+
+    if candidate_count <= 0:
+        return 1, 1
+
+    best_columns = candidate_count
+    best_rows = 1
+    best_score: tuple[int, int] | None = None
+
+    for columns in range(1, candidate_count + 1):
+        rows = math.ceil(candidate_count / columns)
+        empty_slots = rows * columns - candidate_count
+        aspect_gap = abs(columns - rows)
+        score = (aspect_gap, empty_slots)
+        if best_score is None or score < best_score:
+            best_score = score
+            best_columns = columns
+            best_rows = rows
+
+    return best_rows, best_columns
+
+
 def _build_placeholder_tile(label: str, tile_size: int) -> PILImage.Image:
     """构建图片读取失败时使用的占位图。"""
 
@@ -134,12 +166,12 @@ def _build_labeled_tile(image_bytes: bytes, index: int, tile_size: int) -> PILIm
 
 
 def _merge_emoji_tiles(image_bytes_list: list[bytes]) -> bytes:
-    """将候选表情图拼接成一张 5x5 网格图片。"""
+    """将候选表情图拼接成一张尽量接近矩形的网格图片。"""
 
     tile_size = _EMOJI_CANDIDATE_TILE_SIZE
     gap = 12
-    grid_columns = 5
-    grid_rows = 5
+    candidate_count = len(image_bytes_list)
+    grid_rows, grid_columns = _calculate_grid_shape(candidate_count)
     tiles = [
         _build_labeled_tile(image_bytes=image_bytes, index=index, tile_size=tile_size)
         for index, image_bytes in enumerate(image_bytes_list, start=1)
@@ -161,7 +193,7 @@ def _merge_emoji_tiles(image_bytes_list: list[bytes]) -> bytes:
 
 
 async def _build_emoji_candidate_message(emojis: list[MaiEmoji]) -> SessionBackedMessage:
-    """构建供子代理挑选的 5x5 拼图候选消息。"""
+    """构建供子代理挑选的拼图候选消息。"""
 
     image_bytes_list = await asyncio.gather(*[_load_emoji_bytes(emoji) for emoji in emojis])
     merged_image_bytes = await asyncio.to_thread(_merge_emoji_tiles, list(image_bytes_list))
@@ -195,15 +227,17 @@ async def _select_emoji_with_sub_agent(
     if not available_emojis:
         return None, ""
 
-    total_candidate_count = min(len(available_emojis), _EMOJI_CANDIDATE_COUNT)
+    total_candidate_count = min(len(available_emojis), _get_emoji_candidate_count())
     sampled_emojis = sample(available_emojis, total_candidate_count)
     candidate_message = await _build_emoji_candidate_message(sampled_emojis)
+    grid_rows, grid_columns = _calculate_grid_shape(len(sampled_emojis))
 
     system_prompt = (
         "你是 Maisaka 的临时表情包选择子代理。\n"
-        "你会收到群聊上下文，以及 1 条额外候选消息，其中包含一张 5x5 的表情包拼图，一共 25 个位置。\n"
-        "每张小图左上角都有一个较大的序号，范围是 1 到 25。\n"
-        "你的任务是根据上下文和当前语气，从这 25 张图里选出最合适的一张表情包。\n"
+        f"你会收到群聊上下文，以及 1 条额外候选消息，其中包含一张 {grid_rows}x{grid_columns} 的表情包拼图，"
+        f"一共 {len(sampled_emojis)} 个位置。\n"
+        f"每张小图左上角都有一个较大的序号，范围是 1 到 {len(sampled_emojis)}。\n"
+        f"你的任务是根据上下文和当前语气，从这 {len(sampled_emojis)} 张图里选出最合适的一张表情包。\n"
         "如果提供了 requested_emotion，请优先考虑与其接近的候选；如果没有完全匹配，则选择最符合上下文语气的候选。\n"
         "你必须返回一个 JSON 对象（json object），不要输出任何 JSON 之外的内容。\n"
         '返回格式固定为：{"emoji_index":1,"reason":"简短理由"}'
@@ -212,6 +246,8 @@ async def _select_emoji_with_sub_agent(
         content=(
             f"[选择任务]\n"
             f"requested_emotion: {requested_emotion or '未指定'}\n"
+            f"候选总数: {len(sampled_emojis)}\n"
+            f"拼图布局: {grid_rows}x{grid_columns}\n"
             "请只输出 JSON。"
         ),
         timestamp=datetime.now(),