import { ChartDataPoint } from "./HistoryChart.models";

export const formatDisplay = (
  point: ChartDataPoint,
  tab: string,
  comparison: boolean
) => {
  const base = point.amount;
  const cmp = point.compare?.amount ?? 0;

  const formatShort = (val: number) => {
    if (tab === "monthly" && val >= 100000) {
      return `${(val / 100000).toFixed(2)}L`;
    }
    if (tab === "weekly" && val >= 1000) {
      return `${(val / 1000).toFixed(1)}K`;
    }
    return val.toLocaleString("en-IN");
  };

  if (!comparison) return `₹ ${formatShort(base)}`;

  const diff = base - cmp;
  const sign = diff >= 0 ? "+" : "-";

  return `₹ ${formatShort(base)} (${sign}${formatShort(Math.abs(diff))})`;
};

export const formatLabel = (label: string, type: string) => {
  if (type === "monthly") return label;

  if (type === "weekly") {
    const parts = label.split(" - ");
    if (parts.length === 2) {
      const [start, end] = parts;
      const startDay = start.split(" ")[0];
      const [endDay, month] = end.split(" ");
      return `${startDay}–${endDay} ${month}`;
    }
  }

  return label;
};