shoc-frontend-new/src/domain/vendor-portal/lib/uplift-validation.ts

export type UpliftFormValues = {
  amount: number;
  reason: string;
  evidenceFile?: File;
};

export function isApprovalRequired(requested: string, currentNte: number | undefined): boolean {
  const amount = Number.parseFloat(requested);
  if (!Number.isFinite(amount)) {
    return currentNte == null;
  }
  return currentNte == null || amount > currentNte;
}

export function validateUpliftAmount(
  requested: string,
  currentNte: number | undefined,
  reason: string,
  evidence: { file?: File; hasExisting?: boolean },
): string {
  const amount = Number.parseFloat(requested);
  if (!Number.isFinite(amount) || amount <= 0) {
    return "Enter a valid requested NTE amount.";
  }
  if (!isApprovalRequired(requested, currentNte)) {
    return "";
  }
  if (!reason.trim()) {
    return "Please include a reason for the uplift request.";
  }
  if (!evidence.file && !evidence.hasExisting) {
    return "Attach PDF, JPG, or PNG evidence — approval-required requests need evidence.";
  }
  return "";
}