/**
 * Genome Serializer — 将 SKILL.md 文件分解为 6 维认知能力基因组
 *
 * 输入: SKILL.md 文件路径
 * 输出: { mentalModels, patternLibrary, judgment, toolFluency, taste, scarTissue }
 *
 * 分解规则（从 SKILL.md 的结构化内容中提取）：
 *
 *   SKILL.md 区域              →  认知维度
 *   ─────────────────────────────────────────
 *   第一性原理 / 铁律           →  mentalModels (因果链 + 类比)
 *   反模式检查 / Anti-Pattern   →  scarTissue (失败教训 + 反模式)
 *   SOP 步骤 + 工具引用        →  toolFluency (工具 + 流程)
 *   When to Use / NOT for      →  judgment (决策规则 + 边界)
 *   输出模板 / 质量清单        →  taste (标杆 + 质量信号)
 *   模式匹配规则 / 分类标记    →  patternLibrary (问题模式 + 解决模式)
 */

const fs = require('fs');
const path = require('path');

// ══════════════════════════════════════
// SKILL.md 解析器
// ══════════════════════════════════════

function parseSkillFrontmatter(content) {
  const match = content.match(/^---\n([\s\S]*?)\n---/);
  if (!match) return {};

  const yaml = match[1];
  const result = {};

  // 简易 YAML 解析（不依赖外部库）
  const lines = yaml.split('\n');
  let currentKey = null;
  let currentValue = '';

  for (const line of lines) {
    const keyMatch = line.match(/^(\w[\w.]*?):\s*(.*)/);
    if (keyMatch && !line.startsWith('  ')) {
      if (currentKey) result[currentKey] = currentValue.trim();
      currentKey = keyMatch[1];
      currentValue = keyMatch[2];
    } else if (currentKey) {
      currentValue += ' ' + line.trim();
    }
  }
  if (currentKey) result[currentKey] = currentValue.trim();

  return result;
}

function parseMarkdownSections(content) {
  // 去掉 frontmatter
  const body = content.replace(/^---[\s\S]*?---\n*/, '');

  const sections = [];
  const lines = body.split('\n');
  let currentSection = null;
  let currentContent = [];

  for (const line of lines) {
    const headingMatch = line.match(/^(#{1,4})\s+(.+)/);
    if (headingMatch) {
      if (currentSection) {
        currentSection.content = currentContent.join('\n').trim();
        sections.push(currentSection);
      }
      currentSection = {
        level: headingMatch[1].length,
        title: headingMatch[2].trim(),
        content: '',
      };
      currentContent = [];
    } else {
      currentContent.push(line);
    }
  }
  if (currentSection) {
    currentSection.content = currentContent.join('\n').trim();
    sections.push(currentSection);
  }

  return sections;
}

function extractBlockquotes(text) {
  const quotes = [];
  const regex = /^>\s*\*?\*?(.+?)\*?\*?\s*$/gm;
  let match;
  while ((match = regex.exec(text)) !== null) {
    quotes.push(match[1].trim());
  }
  return quotes;
}

function extractTableRows(text) {
  const rows = [];
  const lines = text.split('\n').filter(l => l.includes('|') && !l.match(/^\s*\|[-\s|]+\|\s*$/));
  for (const line of lines) {
    const cells = line.split('|').map(c => c.trim()).filter(Boolean);
    if (cells.length >= 2) rows.push(cells);
  }
  // 去掉表头（第一行）
  return rows.length > 1 ? rows.slice(1) : rows;
}

function extractCodeBlocks(text) {
  const blocks = [];
  const regex = /```(\w*)\n([\s\S]*?)```/g;
  let match;
  while ((match = regex.exec(text)) !== null) {
    blocks.push({ language: match[1] || 'text', code: match[2].trim() });
  }
  return blocks;
}

function extractTools(text) {
  const tools = new Set();
  const toolNames = [
    'grep_search', 'find_by_name', 'view_file', 'view_code_item',
    'view_file_outline', 'search_web', 'read_url_content', 'run_command',
    'write_to_file', 'replace_file_content', 'multi_replace_file_content',
    'generate_image', 'list_dir',
  ];
  for (const tool of toolNames) {
    if (text.includes(tool)) tools.add(tool);
  }
  return [...tools];
}

// ══════════════════════════════════════
// 6 维分解器
// ══════════════════════════════════════

function extractMentalModels(sections) {
  const models = {
    causalChains: [],
    systemDynamics: [],
    analogies: [],
    ironLaws: [],
  };

  for (const sec of sections) {
    const titleLower = sec.title.toLowerCase();

    // 第一性原理、理论、原理
    if (titleLower.includes('第一性') || titleLower.includes('原理') || titleLower.includes('principle')) {
      const quotes = extractBlockquotes(sec.content);
      for (const q of quotes) {
        if (q.includes('→') || q.includes('因为') || q.includes('所以') || q.includes('导致')) {
          models.causalChains.push(q);
        } else if (q.includes('效应') || q.includes('理论') || q.includes('模型')) {
          models.analogies.push(q);
        }
      }

      // 来自 xxx 的子节标题 → 类比
      const analogyMatch = sec.title.match(/来自(.+?)[:：]/);
      if (analogyMatch) {
        models.analogies.push({
          domain: analogyMatch[1].trim(),
          insight: sec.content.split('\n').find(l => l.startsWith('>'))?.replace(/^>\s*/, '') || sec.title,
        });
      }
    }

    // 铁律、铁则
    if (titleLower.includes('铁律') || titleLower.includes('iron') || sec.content.includes('铁律')) {
      const quotes = extractBlockquotes(sec.content);
      models.ironLaws.push(...quotes);
    }

    // 推论
    if (sec.content.includes('推论')) {
      const numbered = sec.content.match(/\d+\.\s+\*\*(.+?)\*\*/g);
      if (numbered) {
        models.causalChains.push(...numbered.map(n => n.replace(/\d+\.\s+\*\*|\*\*/g, '')));
      }
    }
  }

  // 从整个文档提取铁律格式的 blockquotes
  const allContent = sections.map(s => s.content).join('\n');
  const ironLawQuotes = allContent.match(/>\s*\*\*铁律[：:]\*\*\s*(.+)/g);
  if (ironLawQuotes) {
    models.ironLaws.push(...ironLawQuotes.map(q => q.replace(/>\s*\*\*铁律[：:]\*\*\s*/, '')));
  }

  return models;
}

function extractPatternLibrary(sections) {
  const patterns = {
    problemPatterns: [],
    solutionPatterns: [],
    classificationRules: [],
  };

  for (const sec of sections) {
    // 分类标记表 → 解决方案模式
    if (sec.content.includes('分类标记') || sec.content.includes('✅') && sec.content.includes('❌')) {
      const rows = extractTableRows(sec.content);
      for (const row of rows) {
        if (row.length >= 3) {
          patterns.classificationRules.push({
            marker: row[0],
            meaning: row[1],
            action: row[2],
          });
        }
      }
    }

    // 输出模板 → 模式
    if (sec.title.includes('模板') || sec.title.includes('template')) {
      const codeBlocks = extractCodeBlocks(sec.content);
      for (const block of codeBlocks) {
        patterns.solutionPatterns.push({
          name: sec.title,
          template: block.code,
          format: block.language,
        });
      }
    }

    // grep 什么表 → 问题识别模式
    if (sec.content.includes('grep 什么')) {
      const rows = extractTableRows(sec.content);
      for (const row of rows) {
        if (row.length >= 3) {
          patterns.problemPatterns.push({
            dimension: row[0],
            searchTerms: row[1],
            rationale: row[2],
          });
        }
      }
    }
  }

  return patterns;
}

function extractJudgment(sections, frontmatter) {
  const judgment = {
    decisionRules: [],
    tradeoffs: [],
    boundaries: [],
    triggers: [],
    exclusions: [],
  };

  // frontmatter triggers
  if (frontmatter.triggers) {
    judgment.triggers = frontmatter.triggers.split(',').map(t => t.trim()).filter(Boolean);
  }

  for (const sec of sections) {
    const titleLower = sec.title.toLowerCase();

    // When to Use → 决策规则
    if (titleLower.includes('when to use') || titleLower.includes('何时使用')) {
      const items = sec.content.match(/^-\s+(.+)/gm);
      if (items) {
        judgment.decisionRules.push(...items.map(i => i.replace(/^-\s+/, '')));
      }
    }

    // NOT for → 能力边界
    if (sec.content.includes('NOT for') || sec.content.includes('不适用')) {
      const items = sec.content.match(/^-\s+(.+)/gm);
      if (items) {
        judgment.exclusions.push(...items.map(i => i.replace(/^-\s+/, '')));
      }
    }

    // 止损规则 → 边界
    if (sec.content.includes('止损') || sec.content.includes('暂停')) {
      const stopRules = sec.content.match(/\*\*止损.+?\*\*[:：]\s*(.+)/g);
      if (stopRules) {
        judgment.boundaries.push(...stopRules.map(r => r.replace(/\*\*/g, '')));
      }
    }

    // 耗时比 → 权衡偏好
    if (sec.content.includes('耗时比') || sec.content.includes('时间分配')) {
      const ratios = sec.content.match(/\d+%\s*[:：]\s*\w+/g);
      if (ratios) {
        judgment.tradeoffs.push({ type: 'time-allocation', rule: ratios.join(', ') });
      }
    }
  }

  return judgment;
}

function extractToolFluency(sections, skillDir) {
  const fluency = {
    coreTools: [],
    idioms: [],
    automations: [],
    dataAccess: [],
  };

  // 从全文提取工具引用
  const allContent = sections.map(s => s.content).join('\n');
  const tools = extractTools(allContent);
  fluency.coreTools = tools.map(t => ({ name: t, proficiency: 'documented' }));

  // SOP 步骤中的工具使用惯用法
  for (const sec of sections) {
    if (sec.title.includes('Step') || sec.title.includes('步骤')) {
      const toolsInStep = extractTools(sec.content);
      if (toolsInStep.length > 0) {
        fluency.idioms.push({
          step: sec.title,
          tools: toolsInStep,
          description: sec.content.split('\n').find(l => l.startsWith('>'))?.replace(/^>\s*/, '') || '',
        });
      }
    }

    // 外部依赖验证 → 数据获取
    if (sec.title.includes('外部') || sec.title.includes('External') || sec.title.includes('API')) {
      if (sec.content.includes('search_web') || sec.content.includes('read_url_content')) {
        fluency.dataAccess.push({
          type: 'external-api-verification',
          tools: ['search_web', 'read_url_content'],
          sop: sec.content.match(/\d+\.\s+\*\*(.+?)\*\*/g)?.map(s => s.replace(/\d+\.\s+\*\*|\*\*/g, '')) || [],
        });
      }
    }
  }

  // 检测脚本目录
  if (skillDir) {
    const scriptsDir = path.join(skillDir, 'scripts');
    if (fs.existsSync(scriptsDir)) {
      const scripts = fs.readdirSync(scriptsDir)
        .filter(f => f.endsWith('.js') || f.endsWith('.ts') || f.endsWith('.sh'))
        .filter(f => !f.includes('node_modules'));
      for (const script of scripts) {
        fluency.automations.push({
          name: script,
          path: `scripts/${script}`,
          type: path.extname(script).slice(1),
        });
      }
    }
  }

  return fluency;
}

function extractTaste(sections) {
  const taste = {
    exemplars: [],
    qualitySignals: [],
    outputStandards: [],
  };

  for (const sec of sections) {
    // 输出产物表 → 输出标准
    if (sec.title.includes('输出') || sec.title.includes('Output') || sec.title.includes('产物')) {
      const rows = extractTableRows(sec.content);
      for (const row of rows) {
        taste.outputStandards.push({
          artifact: row[0],
          format: row[1],
          location: row[2],
          audience: row[3],
        });
      }
    }

    // 质量清单 → 质量信号
    if (sec.content.includes('质量') || sec.content.includes('DoD') || sec.content.includes('清单')) {
      const items = sec.content.match(/^-\s+(.+)/gm);
      if (items) {
        taste.qualitySignals.push(...items.map(i => ({
          signal: i.replace(/^-\s+/, ''),
          source: sec.title,
        })));
      }
    }

    // 输出模板中的 markdown 代码块 → 标杆
    if (sec.content.includes('```markdown')) {
      const blocks = extractCodeBlocks(sec.content);
      for (const block of blocks) {
        if (block.language === 'markdown') {
          taste.exemplars.push({
            type: 'output-template',
            name: sec.title,
            content: block.code,
          });
        }
      }
    }
  }

  return taste;
}

function extractScarTissue(sections) {
  const scars = {
    failures: [],
    antiPatterns: [],
    antiRationalizations: [],
  };

  for (const sec of sections) {
    const titleLower = sec.title.toLowerCase();

    // 反模式检查清单
    if (titleLower.includes('反模式') || titleLower.includes('anti-pattern') || titleLower.includes('antipattern')) {
      const rows = extractTableRows(sec.content);
      for (const row of rows) {
        if (row.length >= 3) {
          scars.antiPatterns.push({
            pattern: row[0],
            symptom: row[1],
            correction: row[2],
          });
        }
      }
    }

    // 反借口 / Anti-Rationalization
    if (sec.content.includes('反借口') || sec.content.includes('Anti-Rationalization')) {
      const rows = extractTableRows(sec.content);
      for (const row of rows) {
        if (row.length >= 2) {
          scars.antiRationalizations.push({
            excuse: row[0],
            rebuttal: row[1],
          });
        }
      }
    }

    // 被推翻的假设 → failures
    if (sec.content.includes('被推翻') || sec.content.includes('❌')) {
      const items = sec.content.match(/❌\s*[\""]?(.+?)[\""]?\s*→\s*✅\s*(.+)/g);
      if (items) {
        for (const item of items) {
          const parts = item.match(/❌\s*[\""]?(.+?)[\""]?\s*→\s*✅\s*(.+)/);
          if (parts) {
            scars.failures.push({
              wrongAssumption: parts[1].trim(),
              correctReality: parts[2].trim(),
              lesson: `假设 "${parts[1].trim()}" 是错误的`,
            });
          }
        }
      }
    }

    // 反模式检查中的 ❌ 标记
    const antiItems = sec.content.match(/^-\s+❌\s+(.+)/gm);
    if (antiItems) {
      for (const item of antiItems) {
        const text = item.replace(/^-\s+❌\s+/, '');
        if (!scars.antiPatterns.some(a => a.pattern === text)) {
          scars.antiPatterns.push({
            pattern: text,
            symptom: '',
            correction: '',
          });
        }
      }
    }
  }

  return scars;
}

// ══════════════════════════════════════
// 主入口
// ══════════════════════════════════════

/**
 * 将 SKILL.md 分解为 6 维基因组
 * @param {string} skillPath - SKILL.md 的绝对路径
 * @returns {object} 6 维基因组对象
 */
function serializeSkillToGenome(skillPath) {
  const content = fs.readFileSync(skillPath, 'utf-8');
  const skillDir = path.dirname(skillPath);
  const frontmatter = parseSkillFrontmatter(content);
  const sections = parseMarkdownSections(content);

  return {
    // 元信息
    meta: {
      name: frontmatter.name || path.basename(skillDir),
      description: frontmatter.description || '',
      category: frontmatter['metadata']?.match(/category:\s*(\w+)/)?.[1] || 'unknown',
      triggers: (frontmatter.triggers || frontmatter['metadata']?.match(/triggers:\s*(.+)/)?.[1] || '').split(',').map(t => t.trim()).filter(Boolean),
      sourceFile: skillPath,
      parsedAt: new Date().toISOString(),
    },

    // 6 维认知能力
    mentalModels: extractMentalModels(sections),
    patternLibrary: extractPatternLibrary(sections),
    judgment: extractJudgment(sections, frontmatter),
    toolFluency: extractToolFluency(sections, skillDir),
    taste: extractTaste(sections),
    scarTissue: extractScarTissue(sections),
  };
}

/**
 * 批量扫描 skills 目录
 * @param {string} skillsDir - skills 目录路径
 * @returns {object[]} 基因组数组
 */
function scanSkillsDirectory(skillsDir) {
  if (!fs.existsSync(skillsDir)) return [];

  const entries = fs.readdirSync(skillsDir, { withFileTypes: true });
  const genomes = [];

  for (const entry of entries) {
    if (!entry.isDirectory()) continue;
    const skillMd = path.join(skillsDir, entry.name, 'SKILL.md');
    if (!fs.existsSync(skillMd)) continue;

    try {
      const genome = serializeSkillToGenome(skillMd);
      genomes.push(genome);
    } catch (err) {
      console.error(`Failed to parse ${skillMd}: ${err.message}`);
    }
  }

  return genomes;
}

module.exports = {
  serializeSkillToGenome,
  scanSkillsDirectory,
  // 暴露内部函数用于测试
  parseSkillFrontmatter,
  parseMarkdownSections,
  extractMentalModels,
  extractPatternLibrary,
  extractJudgment,
  extractToolFluency,
  extractTaste,
  extractScarTissue,
};