key | domain | email | status | expired | created
  

const SHEET_NAME = "Sheet1";
const ADMIN_TOKEN = "hungblog-admin-2026";

function doGet(e) {
  const action = e.parameter.action;

  if (action === "check") {
    return checkLicense(e);
  }

  if (action === "create") {
    return createLicense(e);
  }

  return json({
    success: false,
    message: "Action không hợp lệ"
  });
}

function createLicense(e) {
  const token = e.parameter.token;
  const domain = e.parameter.domain || "";
  const email = e.parameter.email || "";
  const days = Number(e.parameter.days || 365);

  if (token !== ADMIN_TOKEN) {
    return json({
      success: false,
      message: "Sai token admin"
    });
  }

  if (!domain) {
    return json({
      success: false,
      message: "Thiếu domain"
    });
  }

  const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(SHEET_NAME);

  const key = generateKey();
  const created = new Date();
  const expired = new Date();
  expired.setDate(expired.getDate() + days);

  sheet.appendRow([
    key,
    cleanDomain(domain),
    email,
    "active",
    formatDate(expired),
    formatDate(created)
  ]);

  return json({
    success: true,
    key: key,
    domain: cleanDomain(domain),
    expired: formatDate(expired)
  });
}

function checkLicense(e) {
  const key = e.parameter.key || "";
  const domain = cleanDomain(e.parameter.domain || "");

  if (!key || !domain) {
    return json({
      valid: false,
      message: "Thiếu key hoặc domain"
    });
  }

  const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(SHEET_NAME);
  const rows = sheet.getDataRange().getValues();

  for (let i = 1; i < rows.length; i++) {
    const rowKey = rows[i][0];
    const rowDomain = cleanDomain(rows[i][1]);
    const rowStatus = rows[i][3];
    const rowExpired = rows[i][4];

    if (rowKey === key && rowDomain === domain) {
      const today = new Date();
      const expiredDate = new Date(rowExpired);

      if (rowStatus !== "active") {
        return json({
          valid: false,
          message: "Key đã bị khóa"
        });
      }

      if (expiredDate < today) {
        return json({
          valid: false,
          message: "Key đã hết hạn"
        });
      }

      return json({
        valid: true,
        message: "Key hợp lệ",
        expired: rowExpired
      });
    }
  }

  return json({
    valid: false,
    message: "Key không tồn tại hoặc sai tên miền"
  });
}

function generateKey() {
  const chars = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789";
  let key = "HB";

  for (let block = 0; block < 3; block++) {
    key += "-";
    for (let i = 0; i < 4; i++) {
      key += chars.charAt(Math.floor(Math.random() * chars.length));
    }
  }

  return key;
}

function cleanDomain(domain) {
  return domain
    .replace("https://", "")
    .replace("http://", "")
    .replace("www.", "")
    .replace("/", "")
    .toLowerCase()
    .trim();
}

function formatDate(date) {
  return Utilities.formatDate(date, "Asia/Ho_Chi_Minh", "yyyy-MM-dd");
}

function json(data) {
  return ContentService
    .createTextOutput(JSON.stringify(data))
    .setMimeType(ContentService.MimeType.JSON);
}