/**
 * Product rules:
 * 1) Only latest instruction segment confirmable; history readonly
 * 2) Soft keywords stay work_order
 * 3) No-keyword mail (mail1) -> work_order fallback
 */
import fs from "fs";

const path = "src/services/parse/split-instructions.ts";
let src = fs.readFileSync(path, "utf8");

const marker = "  // 2) ";
const idx = src.indexOf(marker);
if (idx < 0) throw new Error("section 2 marker missing");

const attMarker = "  // 3) ";
const attIdx = src.indexOf(attMarker, idx);
if (attIdx < 0) throw new Error("section 3 marker missing");

const sortMarker = "  // \u5c55\u793a\u987a\u5e8f\uff1a\u5f53\u524d\u6bb5\u4f18\u5148";
const sortIdx = src.indexOf(sortMarker);
if (sortIdx < 0) throw new Error("sort marker missing");

const section2 = `  // 2) \u6b63\u6587\u6309\u5bf9\u8bdd\u6bb5\u62c6\u5206\uff1b\u4ec5\u300c\u6700\u65b0\u4e00\u6761\u6709\u6307\u4ee4\u7684\u6bb5\u300d\u53ef\u786e\u8ba4\uff0c\u5386\u53f2\u53ea\u8bfb
  const segments = splitBodySegments(body);
  let currentSegIndex: number | null = null;
  for (let i = 0; i < segments.length; i++) {
    const seg = segments[i];
    if (isNonInstructionSegment(seg)) continue;
    const kinds = detectKindsForSegment(extractSegmentSubject(seg, ""), seg);
    if (kinds.length) {
      currentSegIndex = i;
      break;
    }
  }
  // \u65e0\u5173\u952e\u8bcd\u6bb5\uff1a\u9996\u4e2a\u975e\u58f3\u6bb5\u4f5c\u4e3a\u515c\u5e95\u5de5\u5355\u8f7d\u4f53
  if (currentSegIndex === null) {
    for (let i = 0; i < segments.length; i++) {
      if (!isNonInstructionSegment(segments[i])) {
        currentSegIndex = i;
        break;
      }
    }
  }

  const kindsInCurrentBody = new Set<InstructionUiKind>();
  segments.forEach((seg, i) => {
    if (isNonInstructionSegment(seg)) return;
    const segSubject = extractSegmentSubject(seg, "");
    const kinds = detectKindsForSegment(segSubject, seg);
    const isCurrent = currentSegIndex !== null && i === currentSegIndex;
    if (!kinds.length) {
      // \u90ae\u4ef61 \u7b49\uff1a\u65e0\u56db\u7c7b\u5173\u952e\u8bcd \u2192 \u6700\u65b0\u6bb5\u515c\u5e95\u4e3a\u5de5\u5355
      if (isCurrent) {
        kindsInCurrentBody.add("work_order");
        push(
          makeUnit({
            uiKind: "work_order",
            source: "body_segment",
            segmentIndex: i,
            isCurrent: true,
            text: seg,
            segmentSubject: segSubject || undefined,
            extraKeywords: ["\u65e0\u5173\u952e\u8bcd\u515c\u5e95"],
          }),
        );
      }
      return;
    }
    for (const kind of kinds) {
      if (isCurrent) kindsInCurrentBody.add(kind);
      push(
        makeUnit({
          uiKind: kind,
          source: "body_segment",
          segmentIndex: i,
          isCurrent,
          text: seg,
          segmentSubject: segSubject || undefined,
        }),
      );
    }
  });

`;

// Replace from section 2 through just before section 3
src = src.slice(0, idx) + section2 + src.slice(attIdx);

// Re-find markers after splice
const attIdx2 = src.indexOf(attMarker);
const pushAttRe =
  /push\(\s*makeUnit\(\{\s*uiKind: kind,\s*source: "attachment",\s*segmentIndex: -2,\s*isCurrent: true,\s*text: f,\s*extraKeywords: \[f\.slice\(0, 40\)\],\s*\}\),\s*\);/;

if (!pushAttRe.test(src.slice(attIdx2, attIdx2 + 800))) {
  throw new Error("attachment push block not found");
}

src = src.replace(
  pushAttRe,
  `const attachCurrent =
        kindsInCurrentBody.size === 0 || !kindsInCurrentBody.has(kind);
      push(
        makeUnit({
          uiKind: kind,
          source: "attachment",
          segmentIndex: -2,
          isCurrent: Boolean(attachCurrent),
          text: f,
          extraKeywords: [f.slice(0, 40)],
        }),
      );`,
);

const sortIdx2 = src.indexOf(sortMarker);
if (sortIdx2 < 0) throw new Error("sort marker missing after edit");

const fallback = `  // \u6574\u5c01\u4ecd\u65e0\u5355\u5143 \u2192 \u5de5\u5355\u515c\u5e95
  if (!units.length && (subject.trim() || body.trim())) {
    push(
      makeUnit({
        uiKind: "work_order",
        source: "record",
        segmentIndex: -3,
        isCurrent: true,
        text: body.trim() || subject,
        segmentSubject: subject || undefined,
        extraKeywords: ["\u65e0\u5173\u952e\u8bcd\u515c\u5e95"],
      }),
    );
  }

`;

src = src.slice(0, sortIdx2) + fallback + src.slice(sortIdx2);

fs.writeFileSync(path, src);
console.log("patched", path);