#!/usr/bin/env node
/**
 * L2 mutual_exclusion 字段 loader 修复 (2026-04-25)
 * route-analyzer.js loadDisambiguationRules() 追加 mutual_exclusion 字段
 *
 * 当前 loader 仅复制 {id, trigger, boost, penalty, weight}，丢弃 mutual_exclusion
 * 修复后: 追加 mutual_exclusion: r.mutual_exclusion 字段，激活互斥消解逻辑
 *
 * 幂等: 若已包含 mutual_exclusion 则跳过
 * 备份: .bak.l2-mutual-exclusion.<ISO>
 * sentinel: PATCH-L2-MUTUAL-EXCLUSION-LOADER-APPLIED
 */
'use strict';

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

const TARGET = path.join(__dirname, '..', 'route-analyzer.js');
const SENTINEL = 'PATCH-L2-MUTUAL-EXCLUSION-LOADER-APPLIED';
const OLD_STR = '      boost: r.boost,\n      penalty: r.penalty,\n      weight: r.weight,\n    }));';
const NEW_STR = '      boost: r.boost,\n      penalty: r.penalty,\n      weight: r.weight,\n      mutual_exclusion: r.mutual_exclusion,\n    }));';

function main() {
  if (!fs.existsSync(TARGET)) {
    console.error('[L2] route-analyzer.js 不存在:', TARGET);
    process.exit(1);
  }
  const content = fs.readFileSync(TARGET, 'utf8');

  // 幂等检查
  if (content.includes(SENTINEL) || content.includes('mutual_exclusion: r.mutual_exclusion')) {
    console.log('[L2] 已是最新状态，跳过');
    process.exit(0);
  }

  if (!content.includes(OLD_STR)) {
    console.error('[L2] 未找到目标代码段，可能已被修改');
    // 输出上下文以便诊断
    const idx = content.indexOf('weight: r.weight');
    if (idx !== -1) {
      console.error('[L2] 找到 weight: r.weight 上下文:\n', content.slice(idx - 50, idx + 100));
    }
    process.exit(1);
  }

  // 备份
  const bak = TARGET + '.bak.l2-mutual-exclusion.' + new Date().toISOString().replace(/[:.]/g, '-');
  fs.copyFileSync(TARGET, bak);
  console.log('[L2] 备份:', bak);

  // 替换
  const newContent = content.replace(OLD_STR, NEW_STR);

  // 原子写入 (tmp + rename)
  const tmp = TARGET + '.l2.tmp.' + process.pid;
  fs.writeFileSync(tmp, newContent, 'utf8');
  fs.renameSync(tmp, TARGET);

  console.log('[L2] 成功: 追加 mutual_exclusion 字段到 loadDisambiguationRules()');
  console.log('[L2] ' + SENTINEL);
}

try { main(); } catch (e) {
  console.error('[L2] 异常:', e.message);
  process.exit(1);
}