// Value formatting shared by the record view and the detail view. Previously
// each had its own near-identical fmtVal/renderCell pair, which drifted.

const MONEY_HINTS = ["amount", "tax", "price", "cost", "total", "payment", "value"];

export const isMoneyField = (key: string) => {
  const k = key.toLowerCase();
  return MONEY_HINTS.some((h) => k.includes(h));
};

export function formatCurrency(n: number, compact = false): string {
  return n.toLocaleString("en-IN", {
    style: "currency",
    currency: "INR",
    maximumFractionDigits: 0,
    ...(compact ? { notation: "compact", compactDisplay: "short" } : {}),
  });
}

export function formatDate(value: string): string {
  const d = new Date(value);
  if (Number.isNaN(d.getTime())) return value;
  return d.toLocaleDateString("en-IN", { day: "2-digit", month: "short", year: "numeric" });
}

/** Clock time, or null when the value carries no time component. */
export function formatTime(value: string): string | null {
  const d = new Date(value);
  if (Number.isNaN(d.getTime())) return null;
  if (!/[T\s]\d{2}:\d{2}/.test(value)) return null;
  return d.toLocaleTimeString("en-IN", { hour: "2-digit", minute: "2-digit" });
}

/** "3 days ago" / "in 2 days" — for aging and timeline captions. */
export function formatRelative(value: string): string | null {
  const d = new Date(value);
  if (Number.isNaN(d.getTime())) return null;
  const diffDays = Math.round((d.getTime() - Date.now()) / 86_400_000);
  if (diffDays === 0) return "today";
  const rtf = new Intl.RelativeTimeFormat("en", { numeric: "auto" });
  if (Math.abs(diffDays) < 31) return rtf.format(diffDays, "day");
  return rtf.format(Math.round(diffDays / 30), "month");
}

export function formatLabel(label: string): string {
  return label.replace(/_/g, " ").replace(/\b\w/g, (c) => c.toUpperCase());
}

/** Plain-text formatting of a view value, honouring its declared data_type. */
export function formatValue(value: unknown, dataType: string, fieldKey: string): string {
  if (value == null || value === "") return "—";
  if (dataType === "number") {
    const n = Number(value);
    if (!Number.isFinite(n)) return String(value);
    return isMoneyField(fieldKey) ? formatCurrency(n) : n.toLocaleString("en-IN");
  }
  if (dataType === "date" || dataType === "datetime") return formatDate(String(value));
  return String(value);
}