export * from "./scale";
export * from "./generator";

interface FluidConfig {
  minSize: number;
  maxSize: number;
  minView?: number; // default 320
  maxView?: number; // default 1200
  unit?: "px" | "rem"; // default rem
  rootSize?: number; // default 16
}

/**
 * Generates a CSS clamp() value for fluid scaling.
 * 
 * @param config Configuration object
 * @returns CSS clamp() string
 */
export function fluid(config: FluidConfig): string {
  const {
    minSize,
    maxSize,
    minView = 320,
    maxView = 1200,
    unit = "rem",
    rootSize = 16
  } = config;

  const slope = (maxSize - minSize) / (maxView - minView);
  const yAxisIntersection = -minView * slope + minSize;

  // Slope in vw units (slope * 100)
  const slopeVw = (slope * 100).toFixed(4);

  // Determine bounds for clamp() so it is always clamp(MIN, VAL, MAX)
  // even if the scaling is inverted (minSize > maxSize)
  const clampMin = Math.min(minSize, maxSize);
  const clampMax = Math.max(minSize, maxSize);
  
  if (unit === "px") {
    const yPx = yAxisIntersection.toFixed(4);
    return `clamp(${clampMin}px, ${yPx}px + ${slopeVw}vw, ${clampMax}px)`;
  }

  // Convert to rem (Accessibilty FTW)
  const minRem = (clampMin / rootSize).toFixed(4);
  const maxRem = (clampMax / rootSize).toFixed(4);
  const yRem = (yAxisIntersection / rootSize).toFixed(4);

  return `clamp(${minRem}rem, ${yRem}rem + ${slopeVw}vw, ${maxRem}rem)`;
}