import { NextResponse } from "next/server";
import { extractContentControls, extractBookmark, templateContentControls, setCustomDocProps, getDocProps,templateDynamicContents } from "@/lib/lib-tmpl";
import { verifyDataEd25519, verifyHmacSha256 } from "@/lib/lib-utils";

export const runtime = "nodejs";

const DOCX_CONTENT_TYPE =
  "application/vnd.openxmlformats-officedocument.wordprocessingml.document";

// cap เดียวกับ N4 (app/actions/files.ts) — route นี้เปิดกว้างให้ภายนอกยิงได้
// ต้องเช็คขนาดก่อนอ่านเข้าหน่วยความจำ กัน DoS (bodySizeLimit ครอบเฉพาะ Server Actions)
const MAX_UPLOAD_BYTES = 100 * 1024 * 1024; // 100MB

export async function POST(request: Request) {
  try {
    const formData = await request.formData();
    const file = formData.get("file");
    const TEST_SECRET = String(formData.get("secret"))??"";
    const TEST_PUBLIC_KEY_HEX = String(formData.get("public_key"))??"";


    if (!(file instanceof File)) {
      return NextResponse.json(
        {
          success: false,
          error: 'Missing DOCX file in field "file".',
        },
        { status: 400 },
      );
    }

    if (
      file.type !== DOCX_CONTENT_TYPE &&
      !file.name.toLowerCase().endsWith(".docx")
    ) {
      return NextResponse.json(
        {
          success: false,
          error: 'Field "file" must be a .docx file.',
        },
        { status: 400 },
      );
    }

    if (file.size > MAX_UPLOAD_BYTES) {
      return NextResponse.json(
        {
          success: false,
          error: 'Field "file" exceeds the 100MB size limit.',
        },
        { status: 400 },
      );
    }

    // File → Buffer
    const buffer = Buffer.from(await file.arrayBuffer());

    // ใช้ lib-tmpl.ts เดิม
    // const data = extractContentControls(buffer);

    const cc = extractContentControls(buffer);
    const bookmark = extractBookmark(buffer)
    const properties = getDocProps(buffer)
    let verify: Record<string, unknown> ={}
    const ticket_data = String(properties?.custom?.ticket_data)
    const HmacSha256 = String(properties?.custom?.HmacSha256)
    const Ed25519 = String(properties?.custom?.Ed25519)

    if(ticket_data){
      const ticketDataObj= JSON.parse(ticket_data)
      const unix_timestamp = Number(ticketDataObj.exp)*1000
      if(unix_timestamp){
        verify['exp'] = new Date(unix_timestamp).toLocaleString("th-TH", { timeZone: "Asia/Bangkok" })
      }
      if(TEST_SECRET && HmacSha256){
        verify['verifyHmacSha256'] = verifyHmacSha256(ticket_data,TEST_SECRET,HmacSha256)
      }
      if(TEST_PUBLIC_KEY_HEX&& Ed25519){
        verify["Ed25519"]=verifyDataEd25519(ticket_data,Ed25519,TEST_PUBLIC_KEY_HEX)
      }
    }
    let returnData : Record<string, unknown> = {
      success: true,
      cc,bookmark,properties,verify
    }

    return NextResponse.json(returnData);
  } catch (error) {
    console.error(error);

    return NextResponse.json(
      {
        success: false,
        error:
          error instanceof Error
            ? error.message
            : "Internal Server Error",
      },
      { status: 500 },
    );
  }
}