// 把一侧请求里的每条消息，回溯到预设的哪个条目，并判断是「原样 / 前缀截断 / 改写」
// 用法: node match-msg.mjs <preset.json> <capture.json>
import { readFileSync } from "node:fs";
const preset = JSON.parse(readFileSync(process.argv[2], "utf8"));
const outer = JSON.parse(readFileSync(process.argv[3], "utf8"));
const body = JSON.parse(outer.body);
const prompts = (preset.prompts || []).filter((p) => String(p.content ?? "").trim());
const norm = (s) => String(s ?? "").replace(/\s+/g, " ").trim();

body.messages.forEach((m, i) => {
  const text = norm(m.content);
  const head = text.slice(0, 80);
  let best = null;
  for (const p of prompts) {
    const c = norm(p.content);
    const p80 = c.slice(0, 80);
    let score = 0;
    for (let k = 0; k < Math.min(p80.length, head.length); k++) {
      if (p80[k] === head[k]) score++;
      else break;
    }
    if (!best || score > best.score) best = { name: p.name || p.identifier, len: c.length, score };
  }
  const ratio = best && best.len ? (text.length / best.len).toFixed(2) : "-";
  console.log(
    "#" + i + " [" + m.role + "] " + text.length + " 字  ← " + (best ? best.name : "?") + " (预设 " + (best ? best.len : 0) + " 字, 前80字重合 " + (best ? best.score : 0) + ", 长度比 " + ratio + ")",
  );
  console.log("    头: " + head.slice(0, 70));
  console.log("    尾: " + text.slice(-70));
});