// extract_hwp.mjs — HWP/HWPX 파일을 텍스트로 추출 (rhwp WASM 사용)
// 사용: node extract_hwp.mjs <input_hwp_path>
// 출력: stdout JSON {ok, text, paragraphs, sections, error?}

import init, { HwpDocument } from "./rhwp.js";
import { readFile } from "node:fs/promises";

async function main() {
  const inputPath = process.argv[2];
  if (!inputPath) {
    console.error(JSON.stringify({ ok: false, error: "missing arg: input path" }));
    process.exit(1);
  }

  try {
    // WASM 초기화 — Node.js fs로 직접 로드
    const { readFileSync } = await import("node:fs");
    const wasmPath = new URL("./rhwp_bg.wasm", import.meta.url);
    const wasmBytes = readFileSync(wasmPath);
    await init({ module_or_path: wasmBytes });

    // HWP 파일 로드
    const fileBytes = await readFile(inputPath);
    const doc = new HwpDocument(new Uint8Array(fileBytes));

    // Method 1: getTextRange로 모든 section/paragraph 순회
    const allParas = [];
    let sectionCount = 0;
    try {
      sectionCount = doc.getSectionCount();
    } catch (e) {
      sectionCount = 1;
    }

    for (let s = 0; s < sectionCount; s++) {
      let paraCount = 0;
      try {
        paraCount = doc.getParagraphCount(s);
      } catch (e) { continue; }

      for (let p = 0; p < paraCount; p++) {
        let paraLen = 0;
        try {
          paraLen = doc.getParagraphLength(s, p);
        } catch (e) { continue; }
        if (paraLen === 0) { allParas.push(""); continue; }
        try {
          const text = doc.getTextRange(s, p, 0, paraLen);
          allParas.push(text || "");
        } catch (e) {
          allParas.push(`[para ${s}.${p} 추출 실패]`);
        }
      }
    }

    const finalText = allParas.filter(p => p && p.trim()).join("\n");

    // free
    try { doc.free(); } catch (e) {}

    console.log(JSON.stringify({
      ok: true,
      text: finalText,
      paragraphs: allParas.length,
      sections: sectionCount,
      char_count: finalText.length,
    }, null, 0));

  } catch (e) {
    console.error(JSON.stringify({
      ok: false,
      error: `${e.name || "Error"}: ${e.message || e}`,
      stack: (e.stack || "").split("\n").slice(0, 5).join(" | "),
    }));
    process.exit(2);
  }
}

main();