export const formatNumber = (
  n: number | null | undefined,
  decimals = 0
): string => {
  if (n == null) return '0';
  return Number(n).toLocaleString('en-US', {
    minimumFractionDigits: decimals,
    maximumFractionDigits: decimals,
  });
};

export const formatPercentage = (n: number | null | undefined): string => {
  if (n == null) return '0%';
  return Number(n).toFixed(1) + '%';
};

export const formatDateTime = (iso: string | null | undefined): string => {
  if (!iso) return '-';
  const d = new Date(iso);
  return d.toLocaleDateString('en-US', {
    month: 'short',
    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
  });
};

export const formatIntentScore = (score: number | null | undefined): string => {
  if (score == null) return '-';
  return (score * 100).toFixed(0) + '%';
};

export const getDateRangeFromPreset = (
  preset: string
): { start: string; end: string } => {
  const today = new Date();
  const end = today.toISOString().split('T')[0];
  let start: string;
  switch (preset) {
    case 'today':
      start = end;
      break;
    case '7d': {
      const d = new Date(today);
      d.setDate(d.getDate() - 6);
      start = d.toISOString().split('T')[0];
      break;
    }
    case '30d': {
      const d = new Date(today);
      d.setDate(d.getDate() - 29);
      start = d.toISOString().split('T')[0];
      break;
    }
    default:
      start = end;
  }
  return { start, end };
};

export const RECOMAZE_COLORS = {
  primary: '#B7007C',
  dark: '#92005E',
  light: '#ffeef8',
  lighter: '#fff5fb',
  accent1: '#d946a8',
  accent2: '#f0abdb',
  accent3: '#ff6b9d',
} as const;

export const CHART_PALETTE = [
  '#B7007C',
  '#92005E',
  '#d946a8',
  '#f0abdb',
  '#ff6b9d',
  '#6366f1',
  '#8b5cf6',
  '#ec4899',
  '#14b8a6',
  '#f59e0b',
] as const;