export const DECIMAL_INPUT_PATTERN = /^-?\d*([.,]\d*)?$/;

export const normalizeDecimalInput = (value: string): string => {
  return value.replace(",", ".");
};

export const trimToScale = (value: string, scale: number): string => {
  const normalized = normalizeDecimalInput(value);

  if (!normalized.includes(".")) {
    return normalized;
  }

  const [integerPart, decimalPart = ""] = normalized.split(".");

  return `${integerPart}.${decimalPart.slice(0, scale)}`;
};

export const parseDecimalOrNull = (value: string): number | null => {
  const normalized = normalizeDecimalInput(value).trim();

  if (normalized === "") {
    return null;
  }

  if (normalized === "-" || normalized === "." || normalized === "-.") {
    return null;
  }

  const parsed = Number(normalized);

  if (!Number.isFinite(parsed)) {
    return null;
  }

  return parsed;
};

export const clampNumber = (value: number, min?: number, max?: number): number => {
  if (typeof min === "number" && value < min) {
    return min;
  }

  if (typeof max === "number" && value > max) {
    return max;
  }

  return value;
};

export const formatDecimalValue = (value: number | null | undefined, scale: number): string => {
  if (value === null || value === undefined || Number.isNaN(value)) {
    return "";
  }

  const asString = String(value);

  if (!asString.includes(".")) {
    return asString;
  }

  const [integerPart, decimalPart = ""] = asString.split(".");
  const trimmedDecimalPart = decimalPart.slice(0, scale).replace(/0+$/, "");

  return trimmedDecimalPart.length > 0 ? `${integerPart}.${trimmedDecimalPart}` : `${integerPart}`;
};