MuMuAINovel/backend/app/services/plot_analyzer.py

"""剧情分析服务 - 自动分析章节的钩子、伏笔、冲突等元素"""
from typing import Dict, Any, List, Optional
from sqlalchemy.ext.asyncio import AsyncSession
from app.services.ai_service import AIService
from app.services.prompt_service import prompt_service, PromptService
from app.logger import get_logger
import json
import re
import asyncio

logger = get_logger(__name__)


class PlotAnalyzer:
    """剧情分析器 - 使用AI分析章节内容"""
    
    def __init__(self, ai_service: AIService):
        """
        初始化剧情分析器
        
        Args:
            ai_service: AI服务实例
        """
        self.ai_service = ai_service
        logger.info("✅ PlotAnalyzer初始化成功")
    
    async def analyze_chapter(
        self,
        chapter_number: int,
        title: str,
        content: str,
        word_count: int,
        user_id: str = None,
        db: AsyncSession = None,
        max_retries: int = 3,
        existing_foreshadows: Optional[List[Dict[str, Any]]] = None
    ) -> Optional[Dict[str, Any]]:
        """
        分析单章内容（带重试机制）
        
        Args:
            chapter_number: 章节号
            title: 章节标题
            content: 章节内容
            word_count: 字数
            user_id: 用户ID（用于获取自定义提示词）
            db: 数据库会话（用于查询自定义提示词）
            max_retries: 最大重试次数，默认3次
            existing_foreshadows: 已埋入的伏笔列表（用于回收匹配）
        
        Returns:
            分析结果字典,失败返回None
        """
        logger.info(f"🔍 开始分析第{chapter_number}章: {title}")
        
        # 如果内容过长,截取前8000字(避免超token)
        analysis_content = content[:8000] if len(content) > 8000 else content
        
        # 获取自定义提示词模板
        try:
            if user_id and db:
                template = await PromptService.get_template("PLOT_ANALYSIS", user_id, db)
            else:
                # 降级到系统默认模板
                template = PromptService.PLOT_ANALYSIS
        except Exception as e:
            logger.warning(f"⚠️ 获取提示词模板失败，使用默认模板: {str(e)}")
            template = PromptService.PLOT_ANALYSIS
        
        # 格式化已有伏笔列表
        foreshadows_text = self._format_existing_foreshadows(existing_foreshadows)
        
        # 格式化提示词
        prompt = PromptService.format_prompt(
            template,
            chapter_number=chapter_number,
            title=title,
            word_count=word_count,
            content=analysis_content,
            existing_foreshadows=foreshadows_text
        )
        
        last_error = None
        
        for attempt in range(1, max_retries + 1):
            try:
                # 调用AI进行分析
                logger.info(f"  📡 调用AI分析(内容长度: {len(analysis_content)}字, 尝试 {attempt}/{max_retries})...")
                accumulated_text = ""
                
                try:
                    async for chunk in self.ai_service.generate_text_stream(
                        prompt=prompt,
                        temperature=0.3  # 降低温度以获得更稳定的JSON输出
                    ):
                        accumulated_text += chunk
                except GeneratorExit:
                    # 流式响应被中断
                    logger.warning(f"⚠️ 流式响应被中断(GeneratorExit)，已累积 {len(accumulated_text)} 字符")
                    # 如果已经累积了足够内容，继续尝试解析
                    if len(accumulated_text) < 100:
                        raise Exception("流式响应中断，内容不足")
                except Exception as stream_error:
                    logger.error(f"❌ 流式生成出错: {str(stream_error)}")
                    raise
                
                # 检查响应是否为空
                if not accumulated_text or len(accumulated_text.strip()) < 10:
                    logger.warning(f"⚠️ AI响应为空或过短(长度: {len(accumulated_text)}), 尝试 {attempt}/{max_retries}")
                    last_error = "AI响应为空或过短"
                    if attempt < max_retries:
                        wait_time = min(2 ** attempt, 10)
                        logger.info(f"  ⏳ 等待 {wait_time} 秒后重试...")
                        await asyncio.sleep(wait_time)
                        continue
                    else:
                        logger.error(f"❌ 第{chapter_number}章分析失败: AI响应为空，已达最大重试次数")
                        return None
                
                # 提取内容
                response_text = accumulated_text
                logger.debug(f"  收到AI响应，长度: {len(response_text)} 字符")
                
                # 解析JSON结果
                analysis_result = self._parse_analysis_response(response_text)
                
                if analysis_result:
                    logger.info(f"✅ 第{chapter_number}章分析完成 (尝试 {attempt}/{max_retries})")
                    logger.info(f"  - 钩子: {len(analysis_result.get('hooks', []))}个")
                    logger.info(f"  - 伏笔: {len(analysis_result.get('foreshadows', []))}个")
                    logger.info(f"  - 情节点: {len(analysis_result.get('plot_points', []))}个")
                    logger.info(f"  - 整体评分: {analysis_result.get('scores', {}).get('overall', 'N/A')}")
                    return analysis_result
                else:
                    # JSON解析失败，重试
                    logger.warning(f"⚠️ JSON解析失败, 尝试 {attempt}/{max_retries}")
                    last_error = "JSON解析失败"
                    if attempt < max_retries:
                        wait_time = min(2 ** attempt, 10)
                        logger.info(f"  ⏳ 等待 {wait_time} 秒后重试...")
                        await asyncio.sleep(wait_time)
                        continue
                    else:
                        logger.error(f"❌ 第{chapter_number}章分析失败: JSON解析错误，已达最大重试次数")
                        return None
                    
            except Exception as e:
                last_error = str(e)
                logger.error(f"❌ 章节分析异常(尝试 {attempt}/{max_retries}): {last_error}")
                
                if attempt < max_retries:
                    wait_time = min(2 ** attempt, 10)
                    logger.info(f"  ⏳ 等待 {wait_time} 秒后重试...")
                    await asyncio.sleep(wait_time)
                    continue
                else:
                    logger.error(f"❌ 第{chapter_number}章分析失败: {last_error}，已达最大重试次数")
                    return None
        
        # 不应该到达这里，但作为安全措施
        logger.error(f"❌ 第{chapter_number}章分析失败: {last_error}")
        return None
    
    def _format_existing_foreshadows(self, foreshadows: Optional[List[Dict[str, Any]]]) -> str:
        """
        格式化已有伏笔列表，用于注入到分析提示词中（智能分类版）
        
        核心策略：
        1. 必须回收的伏笔 - 明确标注，要求AI识别回收
        2. 超期的伏笔 - 提醒AI尽快回收
        3. 未到期的伏笔 - 明确标注禁止提前回收
        
        Args:
            foreshadows: 伏笔列表，每个包含 id, title, content, plant_chapter_number, resolve_status 等
        
        Returns:
            格式化的文本
        """
        if not foreshadows:
            return "（暂无已埋入的伏笔）"
        
        # 按回收状态分类
        must_resolve = []  # 本章必须回收
        overdue = []       # 已超期
        not_yet = []       # 尚未到期
        no_plan = []       # 无明确计划
        
        for fs in foreshadows:
            status = fs.get('resolve_status', 'no_plan')
            if status == 'must_resolve_now':
                must_resolve.append(fs)
            elif status == 'overdue':
                overdue.append(fs)
            elif status == 'not_yet':
                not_yet.append(fs)
            else:
                no_plan.append(fs)
        
        lines = []
        
        # 1. 本章必须回收的伏笔（最高优先级）
        if must_resolve:
            lines.append("=" * 50)
            lines.append("【🎯 本章必须回收的伏笔 - 请务必识别回收】")
            lines.append("=" * 50)
            for i, fs in enumerate(must_resolve, 1):
                fs_id = fs.get('id', 'unknown')
                fs_title = fs.get('title', '未命名伏笔')
                fs_content = fs.get('content', '')[:150]
                plant_chapter = fs.get('plant_chapter_number', '?')
                
                lines.append(f"{i}. 【ID: {fs_id}】{fs_title}")
                lines.append(f"   ⚠️ 回收要求：必须在本章回收此伏笔")
                lines.append(f"   埋入章节：第{plant_chapter}章")
                lines.append(f"   伏笔内容：{fs_content}{'...' if len(fs.get('content', '')) > 150 else ''}")
                lines.append(f"   回收时请在 reference_foreshadow_id 中填写: {fs_id}")
                lines.append("")
        
        # 2. 超期的伏笔（需要尽快处理）
        if overdue:
            lines.append("-" * 50)
            lines.append("【⚠️ 超期待回收伏笔 - 建议尽快回收】")
            lines.append("-" * 50)
            for i, fs in enumerate(overdue, 1):
                fs_id = fs.get('id', 'unknown')
                fs_title = fs.get('title', '未命名伏笔')
                fs_content = fs.get('content', '')[:100]
                plant_chapter = fs.get('plant_chapter_number', '?')
                hint = fs.get('resolve_hint', '')
                
                lines.append(f"{i}. 【ID: {fs_id}】{fs_title}")
                lines.append(f"   状态：{hint}")
                lines.append(f"   埋入章节：第{plant_chapter}章")
                lines.append(f"   内容：{fs_content}{'...' if len(fs.get('content', '')) > 100 else ''}")
                lines.append("")
        
        # 3. 尚未到期的伏笔（禁止提前回收，仅作参考）
        if not_yet:
            lines.append("-" * 50)
            lines.append("【📋 尚未到期的伏笔 - 仅供参考，请勿在本章回收】")
            lines.append("-" * 50)
            lines.append("⚠️ 以下伏笔尚未到计划回收时间，请勿提前回收！")
            lines.append("")
            for i, fs in enumerate(not_yet[:5], 1):  # 最多显示5个
                fs_title = fs.get('title', '未命名伏笔')
                target_chapter = fs.get('target_resolve_chapter_number', '?')
                hint = fs.get('resolve_hint', '')
                
                lines.append(f"{i}. {fs_title}")
                lines.append(f"   计划回收章节：第{target_chapter}章 | {hint}")
                lines.append("")
            
            if len(not_yet) > 5:
                lines.append(f"   ... 还有 {len(not_yet) - 5} 个未到期伏笔")
                lines.append("")
        
        # 4. 无明确计划的伏笔（可根据剧情自然回收）
        if no_plan:
            lines.append("-" * 50)
            lines.append("【📝 无明确计划的伏笔 - 可根据剧情自然回收】")
            lines.append("-" * 50)
            for i, fs in enumerate(no_plan[:3], 1):  # 最多显示3个
                fs_id = fs.get('id', 'unknown')
                fs_title = fs.get('title', '未命名伏笔')
                fs_content = fs.get('content', '')[:80]
                plant_chapter = fs.get('plant_chapter_number', '?')
                
                lines.append(f"{i}. 【ID: {fs_id}】{fs_title}")
                lines.append(f"   埋入章节：第{plant_chapter}章")
                lines.append(f"   内容：{fs_content}{'...' if len(fs.get('content', '')) > 80 else ''}")
                lines.append("")
        
        return "\n".join(lines) if lines else "（暂无已埋入的伏笔）"
    
    def _parse_analysis_response(self, response: str) -> Optional[Dict[str, Any]]:
        """
        解析AI返回的分析结果（使用统一的JSON清洗方法）
        
        Args:
            response: AI返回的文本
        
        Returns:
            解析后的字典,失败返回None
        """
        try:
            # 使用统一的JSON清洗方法
            cleaned = self.ai_service._clean_json_response(response)
            
            # 尝试解析JSON
            result = json.loads(cleaned)
            
            # 验证必要字段
            required_fields = ['hooks', 'plot_points', 'scores']
            for field in required_fields:
                if field not in result:
                    logger.warning(f"⚠️ 分析结果缺少字段: {field}")
                    result[field] = [] if field != 'scores' else {}
            
            logger.info("✅ 成功解析分析结果")
            return result
            
        except json.JSONDecodeError as e:
            logger.error(f"❌ JSON解析失败: {str(e)}")
            logger.error(f"  原始响应(前500字): {response[:500]}")
            return None
        except Exception as e:
            logger.error(f"❌ 解析异常: {str(e)}")
            return None
    
    def extract_memories_from_analysis(
        self,
        analysis: Dict[str, Any],
        chapter_id: str,
        chapter_number: int,
        chapter_content: str = "",
        chapter_title: str = ""
    ) -> List[Dict[str, Any]]:
        """
        从分析结果中提取记忆片段
        
        Args:
            analysis: 分析结果
            chapter_id: 章节ID
            chapter_number: 章节号
            chapter_content: 章节完整内容(用于计算位置)
            chapter_title: 章节标题
        
        Returns:
            记忆片段列表
        """
        memories = []
        
        try:
            # 【新增】0. 提取章节摘要作为记忆（用于语义检索相关章节）
            chapter_summary = ""
            
            # 尝试从分析结果获取摘要
            if analysis.get('summary'):
                chapter_summary = analysis.get('summary')
            # 或者从情节点组合生成摘要
            elif analysis.get('plot_points'):
                plot_summaries = [p.get('content', '') for p in analysis.get('plot_points', [])[:3]]
                chapter_summary = "；".join(plot_summaries)
            # 或者使用内容前300字
            elif chapter_content:
                chapter_summary = chapter_content[:300] + ("..." if len(chapter_content) > 300 else "")
            
            # 如果有摘要，添加到记忆中
            if chapter_summary:
                memories.append({
                    'type': 'chapter_summary',
                    'content': chapter_summary,
                    'title': f"第{chapter_number}章《{chapter_title}》摘要",
                    'metadata': {
                        'chapter_id': chapter_id,
                        'chapter_number': chapter_number,
                        'importance_score': 0.6,  # 中等重要性
                        'tags': ['摘要', '章节概览', chapter_title],
                        'is_foreshadow': 0,
                        'text_position': 0,
                        'text_length': len(chapter_summary)
                    }
                })
                logger.info(f"  ✅ 添加章节摘要记忆: {len(chapter_summary)}字")
            
            # 1. 提取钩子作为记忆
            for i, hook in enumerate(analysis.get('hooks', [])):
                if hook.get('strength', 0) >= 6:  # 只保存强度>=6的钩子
                    keyword = hook.get('keyword', '')
                    position, length = self._find_text_position(chapter_content, keyword)
                    
                    logger.info(f"  钩子位置: keyword='{keyword[:30]}...', pos={position}, len={length}")
                    
                    memories.append({
                        'type': 'hook',
                        'content': f"[{hook.get('type', '未知')}钩子] {hook.get('content', '')}",
                        'title': f"{hook.get('type', '钩子')} - {hook.get('position', '')}",
                        'metadata': {
                            'chapter_id': chapter_id,
                            'chapter_number': chapter_number,
                            'importance_score': min(hook.get('strength', 5) / 10, 1.0),
                            'tags': [hook.get('type', '钩子'), hook.get('position', '')],
                            'is_foreshadow': 0,
                            'keyword': keyword,
                            'text_position': position,
                            'text_length': length,
                            'strength': hook.get('strength', 5),
                            'position_desc': hook.get('position', '')
                        }
                    })
            
            # 2. 提取伏笔作为记忆
            for i, foreshadow in enumerate(analysis.get('foreshadows', [])):
                is_planted = foreshadow.get('type') == 'planted'
                keyword = foreshadow.get('keyword', '')
                position, length = self._find_text_position(chapter_content, keyword)
                
                logger.info(f"  伏笔位置: keyword='{keyword[:30]}...', pos={position}, len={length}")
                
                memories.append({
                    'type': 'foreshadow',
                    'content': foreshadow.get('content', ''),
                    'title': f"{'埋下伏笔' if is_planted else '回收伏笔'}",
                    'metadata': {
                        'chapter_id': chapter_id,
                        'chapter_number': chapter_number,
                        'importance_score': min(foreshadow.get('strength', 5) / 10, 1.0),
                        'tags': ['伏笔', foreshadow.get('type', 'planted')],
                        'is_foreshadow': 1 if is_planted else 2,
                        'reference_chapter': foreshadow.get('reference_chapter'),
                        'keyword': keyword,
                        'text_position': position,
                        'text_length': length,
                        'foreshadow_type': foreshadow.get('type', 'planted'),
                        'strength': foreshadow.get('strength', 5)
                    }
                })
            
            # 3. 提取关键情节点
            for i, plot_point in enumerate(analysis.get('plot_points', [])):
                if plot_point.get('importance', 0) >= 0.6:  # 只保存重要性>=0.6的情节点
                    keyword = plot_point.get('keyword', '')
                    position, length = self._find_text_position(chapter_content, keyword)
                    
                    logger.info(f"  情节点位置: keyword='{keyword[:30]}...', pos={position}, len={length}")
                    
                    memories.append({
                        'type': 'plot_point',
                        'content': f"{plot_point.get('content', '')}。影响: {plot_point.get('impact', '')}",
                        'title': f"情节点 - {plot_point.get('type', '未知')}",
                        'metadata': {
                            'chapter_id': chapter_id,
                            'chapter_number': chapter_number,
                            'importance_score': plot_point.get('importance', 0.5),
                            'tags': ['情节点', plot_point.get('type', '未知')],
                            'is_foreshadow': 0,
                            'keyword': keyword,
                            'text_position': position,
                            'text_length': length
                        }
                    })
            
            # 4. 提取角色状态变化
            for i, char_state in enumerate(analysis.get('character_states', [])):
                char_name = char_state.get('character_name', '未知角色')
                memories.append({
                    'type': 'character_event',
                    'content': f"{char_name}的状态变化: {char_state.get('state_before', '')} → {char_state.get('state_after', '')}。{char_state.get('psychological_change', '')}",
                    'title': f"{char_name}的变化",
                    'metadata': {
                        'chapter_id': chapter_id,
                        'chapter_number': chapter_number,
                        'importance_score': 0.7,
                        'tags': ['角色', char_name, '状态变化'],
                        'related_characters': [char_name],
                        'is_foreshadow': 0
                    }
                })
            
            # 5. 如果有重要冲突,也记录下来
            conflict = analysis.get('conflict', {})
            
            if conflict and conflict.get('level', 0) >= 7:
                # 确保 parties 和 types 都是字符串列表
                parties = conflict.get('parties', [])
                if parties and isinstance(parties, list):
                    parties = [str(p) for p in parties]
                
                types = conflict.get('types', [])
                if types and isinstance(types, list):
                    types = [str(t) for t in types]
                
                memories.append({
                    'type': 'plot_point',
                    'content': f"重要冲突: {conflict.get('description', '')}。冲突各方: {', '.join(parties)}",
                    'title': f"冲突 - 强度{conflict.get('level', 0)}",
                    'metadata': {
                        'chapter_id': chapter_id,
                        'chapter_number': chapter_number,
                        'importance_score': min(conflict.get('level', 5) / 10, 1.0),
                        'tags': ['冲突'] + types,
                        'is_foreshadow': 0
                    }
                })
            
            logger.info(f"📝 从分析中提取了{len(memories)}条记忆")
            return memories
            
        except Exception as e:
            logger.error(f"❌ 提取记忆失败: {str(e)}")
            return []
    
    def _find_text_position(self, full_text: str, keyword: str) -> tuple[int, int]:
        """
        在全文中查找关键词位置
        
        Args:
            full_text: 完整文本
            keyword: 关键词
        
        Returns:
            (起始位置, 长度) 如果未找到返回(-1, 0)
        """
        if not keyword or not full_text:
            return (-1, 0)
        
        try:
            # 1. 精确匹配
            pos = full_text.find(keyword)
            if pos != -1:
                return (pos, len(keyword))
            
            # 2. 去除标点符号后匹配
            import re
            clean_keyword = re.sub(r'[，。！？、；：""''（）《》【】]', '', keyword)
            clean_text = re.sub(r'[，。！？、；：""''（）《》【】]', '', full_text)
            pos = clean_text.find(clean_keyword)
            
            if pos != -1:
                # 反向映射到原文位置（简化处理）
                return (pos, len(clean_keyword))
            
            # 3. 模糊匹配：查找关键词的前半部分
            if len(keyword) > 10:
                partial = keyword[:min(15, len(keyword))]
                pos = full_text.find(partial)
                if pos != -1:
                    return (pos, len(partial))
            
            # 4. 未找到
            logger.debug(f"未找到关键词位置: {keyword[:30]}...")
            return (-1, 0)
            
        except Exception as e:
            logger.error(f"查找位置失败: {str(e)}")
            return (-1, 0)
    
    def generate_analysis_summary(self, analysis: Dict[str, Any]) -> str:
        """
        生成分析摘要文本
        
        Args:
            analysis: 分析结果
        
        Returns:
            格式化的摘要文本
        """
        try:
            lines = ["=== 章节分析报告 ===\n"]
            
            # 整体评分
            scores = analysis.get('scores', {})
            lines.append(f"【整体评分】")
            lines.append(f"  整体质量: {scores.get('overall', 'N/A')}/10")
            lines.append(f"  节奏把控: {scores.get('pacing', 'N/A')}/10")
            lines.append(f"  吸引力: {scores.get('engagement', 'N/A')}/10")
            lines.append(f"  连贯性: {scores.get('coherence', 'N/A')}/10\n")
            
            # 剧情阶段
            lines.append(f"【剧情阶段】{analysis.get('plot_stage', '未知')}\n")
            
            # 钩子统计
            hooks = analysis.get('hooks', [])
            if hooks:
                lines.append(f"【钩子分析】共{len(hooks)}个")
                for hook in hooks[:3]:  # 只显示前3个
                    lines.append(f"  • [{hook.get('type')}] {hook.get('content', '')[:50]}... (强度:{hook.get('strength', 0)})")
                lines.append("")
            
            # 伏笔统计
            foreshadows = analysis.get('foreshadows', [])
            if foreshadows:
                planted = sum(1 for f in foreshadows if f.get('type') == 'planted')
                resolved = sum(1 for f in foreshadows if f.get('type') == 'resolved')
                lines.append(f"【伏笔分析】埋下{planted}个, 回收{resolved}个\n")
            
            # 冲突分析
            conflict = analysis.get('conflict', {})
            if conflict:
                lines.append(f"【冲突分析】")
                lines.append(f"  类型: {', '.join(conflict.get('types', []))}")
                lines.append(f"  强度: {conflict.get('level', 0)}/10")
                lines.append(f"  进度: {int(conflict.get('resolution_progress', 0) * 100)}%\n")
            
            # 改进建议
            suggestions = analysis.get('suggestions', [])
            if suggestions:
                lines.append(f"【改进建议】")
                for i, sug in enumerate(suggestions, 1):
                    lines.append(f"  {i}. {sug}")
            
            return "\n".join(lines)
            
        except Exception as e:
            logger.error(f"❌ 生成摘要失败: {str(e)}")
            return "分析摘要生成失败"


# 创建全局实例(需要时手动初始化)
_plot_analyzer_instance = None

def get_plot_analyzer(ai_service: AIService) -> PlotAnalyzer:
    """获取剧情分析器实例"""
    global _plot_analyzer_instance
    if _plot_analyzer_instance is None:
        _plot_analyzer_instance = PlotAnalyzer(ai_service)
    return _plot_analyzer_instance