Checkbox

// Shared motion tokens. Easing curves mirror the CSS custom properties in
// globals.css; springs are the canonical physics used across components.
// Strong custom variants — defaults like `ease-in`/`ease-out` feel weak.

export const EASE_OUT = [0.16, 1, 0.3, 1] as const;
export const EASE_IN_OUT = [0.77, 0, 0.175, 1] as const;
export const EASE_DRAWER = [0.32, 0.72, 0, 1] as const;

/** CSS string form of EASE_OUT for inline style transitions. */
export const EASE_OUT_CSS = "cubic-bezier(0.16, 1, 0.3, 1)";

/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
  type: "spring",
  stiffness: 500,
  damping: 30,
  mass: 0.6,
} as const;

/** Content swaps — label/icon slots trading places inside a control. */
export const SPRING_SWAP = {
  type: "spring",
  stiffness: 460,
  damping: 30,
  mass: 0.55,
} as const;

/** Overlay panel entrances — modals and sheets summoned by pointer. */
export const SPRING_PANEL = {
  type: "spring",
  stiffness: 420,
  damping: 40,
  mass: 0.5,
} as const;

/** Shared-layout glides — pills, indicators and panels morphing between positions. */
export const SPRING_LAYOUT = {
  type: "spring",
  stiffness: 360,
  damping: 32,
  mass: 0.6,
} as const;

/** Cursor-follow physics for decorative mouse tracking (magnetic, tilt, dock). */
export const SPRING_MOUSE = {
  stiffness: 200,
  damping: 15,
  mass: 0.3,
} as const;

import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

"use client";

import { AnimatePresence, motion, useReducedMotion } from "motion/react";
import { useId } from "react";
import { EASE_OUT, SPRING_PRESS } from "@/lib/ease";
import { cn } from "@/lib/utils";

const CHECK_PATH = "M5 13l4 4L19 7";
const INDETERMINATE_PATH = "M6 12h12";

export interface CheckboxProps {
  checked: boolean;
  onCheckedChange: (checked: boolean) => void;
  disabled?: boolean;
  indeterminate?: boolean;
  label?: string;
  className?: string;
  id?: string;
}

export function Checkbox({
  checked,
  onCheckedChange,
  disabled,
  indeterminate,
  label,
  className,
  id: idProp,
}: CheckboxProps) {
  const autoId = useId();
  const id = idProp ?? autoId;
  const reduce = useReducedMotion();
  const showMark = checked || indeterminate;
  const path = indeterminate ? INDETERMINATE_PATH : CHECK_PATH;

  return (
    <span className={cn("inline-flex items-center gap-3", className)}>
      <motion.button
        id={id}
        type="button"
        role="checkbox"
        aria-checked={indeterminate ? "mixed" : checked}
        disabled={disabled}
        onClick={() => !disabled && onCheckedChange(!checked)}
        whileTap={reduce || disabled ? undefined : { scale: 0.92 }}
        transition={SPRING_PRESS}
        data-state={
          checked ? "checked" : indeterminate ? "indeterminate" : "unchecked"
        }
        className={cn(
          "inline-flex h-5 w-5 shrink-0 items-center justify-center rounded-md border-2 outline-none transition-colors duration-200",
          "focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background",
          "disabled:cursor-not-allowed disabled:opacity-60",
          showMark
            ? "border-primary bg-primary text-primary-foreground"
            : "border-muted-foreground/50 bg-background hover:border-muted-foreground",
        )}
      >
        <AnimatePresence initial={false}>
          {showMark ? (
            <motion.svg
              key={indeterminate ? "indeterminate" : "checked"}
              width="12"
              height="12"
              viewBox="0 0 24 24"
              fill="none"
              stroke="currentColor"
              strokeWidth={3}
              strokeLinecap="round"
              strokeLinejoin="round"
              initial={reduce ? { opacity: 1 } : { opacity: 0, scale: 0.5 }}
              animate={reduce ? { opacity: 1 } : { opacity: 1, scale: 1 }}
              exit={
                reduce
                  ? { opacity: 0 }
                  : { opacity: 0, scale: 0.5, filter: "blur(4px)" }
              }
              transition={
                reduce ? { duration: 0 } : { duration: 0.16, ease: EASE_OUT }
              }
              aria-hidden
            >
              <title>{indeterminate ? "Partially selected" : "Selected"}</title>
              <motion.path
                d={path}
                initial={reduce ? { pathLength: 1 } : { pathLength: 0 }}
                animate={{ pathLength: 1 }}
                transition={
                  reduce
                    ? { duration: 0 }
                    : {
                        duration: indeterminate ? 0.2 : 0.3,
                        ease: EASE_OUT,
                        delay: 0.04,
                      }
                }
              />
            </motion.svg>
          ) : null}
        </AnimatePresence>
      </motion.button>
      {label ? (
        <label
          htmlFor={id}
          className={cn(
            "text-sm text-foreground",
            disabled ? "cursor-not-allowed opacity-60" : "cursor-pointer",
          )}
        >
          {label}
        </label>
      ) : null}
    </span>
  );
}