# All files / modules/book-generator/parsers section.parser.ts

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     /**
     * 节解析器
     * 容错解析LLM返回的节大纲JSON
     */

    export function parseSections(jsonStr: string): { sections: any[] } | null {
      if (!jsonStr || typeof jsonStr !== 'string') {
        console.error('[SectionParser] 输入为空或非字符串');
        return null;
      }

      try {
        let data: any;
        let cleanedStr = jsonStr.trim();

        // 调试：打印前50个字符的编码
        const debugStr = cleanedStr.substring(0, Math.min(50, cleanedStr.length));
        console.log('[SectionParser] 原始前50字符:', JSON.stringify(debugStr));

        // 清理 JSON 字符串中的非法控制字符和多余空白
        cleanedStr = cleanedStr.replace(/[\x00-\x1F\x7F]/g, (char) => {
          if (char === '\n') return ' ';
          if (char === '\r') return ' ';
          if (char === '\t') return ' ';
          return ' ';
        });

        // 移除 markdown 代码块标记
        cleanedStr = cleanedStr.replace(/```json\s*/gi, '').replace(/```\s*/g, '').trim();

        // 移除思考标签
        cleanedStr = cleanedStr.replace(/^[\s\S]*?<blockquote>\s*[\s\S]*?<\/blockquote>\s*/, '');
        const secThinkIdx = cleanedStr.indexOf('</think>');
        if (secThinkIdx === 0) cleanedStr = cleanedStr.substring(secThinkIdx + 8).trim();

        console.log('[SectionParser] 清理后:', cleanedStr.substring(0, Math.min(100, cleanedStr.length)));

        try {
          data = JSON.parse(cleanedStr);
        } catch (firstErr) {
          console.log('[SectionParser] 首次解析失败，尝试正则提取');
          // 尝试找到 JSON 对象
          const match = cleanedStr.match(/\{[\s\S]*\}/);
          if (!match) {
            console.error('[SectionParser] 未找到 JSON 对象');
            return null;
          }
          try {
            const jsonCandidate = match[0];
            console.log('[SectionParser] 正则提取:', jsonCandidate.substring(0, Math.min(100, jsonCandidate.length)));
            data = JSON.parse(jsonCandidate);
          } catch (parseErr) {
            console.error('[SectionParser] JSON 解析失败:', parseErr, '原始:', cleanedStr.substring(0, 200));
            return null;
          }
        }

        if (!data || typeof data !== 'object') {
          console.error('[SectionParser] 解析结果非对象');
          return null;
        }

        // 兼容：如果顶层就是数组
        if (Array.isArray(data)) {
          data = { sections: data };
        }

        // 兼容多种字段名：sections, Sections, section_list 等
        let sectionsArray = data.sections || data.Sections || data.section_list || data.chapter_sections;

        if (!Array.isArray(sectionsArray)) {
          console.error('[SectionParser] sections 字段缺失或非数组，实际keys:', Object.keys(data));
          return null;
        }

        return {
          sections: sectionsArray.map((s: any, i: number) => ({
            number: s.number || i + 1,
            title: s.title || `第${i + 1}节`,
            summary: typeof s.summary === 'string' ? s.summary : '',
            keyPoints: Array.isArray(s.keyPoints) ? s.keyPoints : [],
            estimatedWords: typeof s.estimatedWords === 'number' ? s.estimatedWords : 1000,
          })),
        };
      } catch (err) {
        console.error('[SectionParser] 未知错误:', err);
        return null;
      }
    }