export function getInitials(name: string): string {
  const s = name.trim();
  if (!s) return "SN";
  const clean = s.replace(/[^a-zA-Z0-9]+/g, " ").trim();
  const parts = clean ? clean.split(/\s+/) : [s];
  const a = (parts[0] || s).charAt(0) || "S";
  const b = (parts[1] || "").charAt(0) || ((parts[0] || s).charAt(1) || "N");
  return (a + b).toUpperCase();
}

function hashString(str: string): number {
  let hash = 2166136261;
  for (let i = 0; i < str.length; i++) {
    hash ^= str.charCodeAt(i);
    hash = (hash * 16777619) >>> 0;
  }
  return hash >>> 0;
}

function hslToRgb(h: number, s: number, l: number): string {
  s /= 100;
  l /= 100;
  const c = (1 - Math.abs(2 * l - 1)) * s;
  const x = c * (1 - Math.abs(((h / 60) % 2) - 1));
  const m = l - c / 2;
  let r = 0, g = 0, b = 0;

  if (0 <= h && h < 60) {
    r = c; g = x; b = 0;
  } else if (60 <= h && h < 120) {
    r = x; g = c; b = 0;
  } else if (120 <= h && h < 180) {
    r = 0; g = c; b = x;
  } else if (180 <= h && h < 240) {
    r = 0; g = x; b = c;
  } else if (240 <= h && h < 300) {
    r = x; g = 0; b = c;
  } else if (300 <= h && h < 360) {
    r = c; g = 0; b = x;
  }
  r = Math.round((r + m) * 255);
  g = Math.round((g + m) * 255);
  b = Math.round((b + m) * 255);
  return `rgb(${r}, ${g}, ${b})`;
}

export function getLogoGradient(name: string): { color1: string; color2: string } {
  const h = hashString(name);
  const hue = h % 360;
  const hue2 = (hue + 36 + (h % 24)) % 360;
  return {
    color1: hslToRgb(hue, 85, 58),
    color2: hslToRgb(hue2, 85, 48),
  };
}