function toDateOnly(value) {
  if (!value) {
    return null;
  }

  const date = new Date(`${String(value).slice(0, 10)}T00:00:00.000Z`);
  return Number.isNaN(date.getTime()) ? null : date;
}

function toDateTime(value) {
  if (!value) {
    return null;
  }

  const date = new Date(value);
  return Number.isNaN(date.getTime()) ? null : date;
}

function toMoneyString(value) {
  if (value == null || value === "") {
    return null;
  }

  const numeric = Number(value);
  return Number.isFinite(numeric) ? numeric.toFixed(2) : null;
}

function normalizeTravelImportRows(rows) {
  if (!Array.isArray(rows)) {
    return [];
  }

  return rows
    .map((item) => {
      const source = String(item?.source ?? "manual").trim().toLowerCase();
      const externalOrderNo = String(item?.externalOrderNo ?? "").trim();
      const employeeId = String(item?.employeeId ?? "").trim();
      if (!externalOrderNo || !employeeId) {
        return null;
      }

      const hasTravelRequestId = Object.prototype.hasOwnProperty.call(item ?? {}, "travelRequestId");
      const rawTravelRequestId = String(item?.travelRequestId ?? "").trim();

      return {
        source,
        externalOrderNo,
        employeeId,
        linkedReimbursementId:
          item?.linkedReimbursementId && String(item.linkedReimbursementId).trim()
            ? String(item.linkedReimbursementId).trim()
            : null,
        travelRequestId: rawTravelRequestId || null,
        hasTravelRequestId,
        amount: toMoneyString(item?.amount),
        currency: String(item?.currency ?? "CNY").trim().toUpperCase() || "CNY",
        occurredAt: toDateOnly(item?.occurredAt),
        rawPayload: item ?? null,
      };
    })
    .filter(Boolean);
}

function normalizeTravelAuthorizationRows(rows) {
  if (!Array.isArray(rows)) {
    return [];
  }

  return rows
    .map((item) => {
      const source = String(item?.source ?? "manual").trim().toLowerCase();
      const externalAuthNo = String(item?.externalAuthNo ?? item?.externalAuthNumber ?? "").trim();
      const employeeId = String(item?.employeeId ?? "").trim();
      const travelRequestId = String(item?.travelRequestId ?? "").trim();
      if (!externalAuthNo || !employeeId || !travelRequestId) {
        return null;
      }

      return {
        source,
        externalAuthNo,
        employeeId,
        travelRequestId,
        budgetPoolId:
          item?.budgetPoolId && String(item.budgetPoolId).trim()
            ? String(item.budgetPoolId).trim()
            : null,
        authorizedAmount: toMoneyString(item?.authorizedAmount),
        settledAmount: toMoneyString(item?.settledAmount) ?? "0.00",
        reversedAmount: toMoneyString(item?.reversedAmount) ?? "0.00",
        currency: String(item?.currency ?? "CNY").trim().toUpperCase() || "CNY",
        occurredAt: toDateTime(item?.occurredAt),
        expiresAt: toDateTime(item?.expiresAt),
        status: String(item?.status ?? "authorized").trim().toLowerCase() || "authorized",
        rawPayload: item ?? null,
      };
    })
    .filter(Boolean);
}

function normalizeTravelTransactionRows(rows) {
  if (!Array.isArray(rows)) {
    return [];
  }

  return rows
    .map((item) => {
      const source = String(item?.source ?? "manual").trim().toLowerCase();
      const externalTxnId = String(item?.externalTxnId ?? item?.externalTransactionId ?? "").trim();
      const employeeId = String(item?.employeeId ?? "").trim();
      const travelRequestId = String(item?.travelRequestId ?? "").trim();
      if (!externalTxnId || !employeeId || !travelRequestId) {
        return null;
      }

      const rawCardAuthorizationId = String(item?.cardAuthorizationId ?? "").trim();
      const rawTravelOrderId = String(item?.travelOrderId ?? "").trim();

      return {
        source,
        externalTxnId,
        employeeId,
        travelRequestId,
        cardAuthorizationId: rawCardAuthorizationId || null,
        hasCardAuthorizationId: Object.prototype.hasOwnProperty.call(item ?? {}, "cardAuthorizationId"),
        travelOrderId: rawTravelOrderId || null,
        hasTravelOrderId: Object.prototype.hasOwnProperty.call(item ?? {}, "travelOrderId"),
        amount: toMoneyString(item?.amount),
        currency: String(item?.currency ?? "CNY").trim().toUpperCase() || "CNY",
        txnType: String(item?.txnType ?? "charge").trim().toLowerCase() || "charge",
        status: String(item?.status ?? "pending").trim().toLowerCase() || "pending",
        occurredAt: toDateTime(item?.occurredAt),
        rawPayload: item ?? null,
      };
    })
    .filter(Boolean);
}

module.exports = {
  normalizeTravelImportRows,
  normalizeTravelAuthorizationRows,
  normalizeTravelTransactionRows,
};