"use client";

import { AnimatePresence, motion, useReducedMotion, type Variants } from "motion/react";
import {
  cloneElement,
  isValidElement,
  useId,
  useRef,
  useState,
  type ReactElement,
  type ReactNode,
} from "react";
import { cn } from "@/lib/utils";

type Side = "top" | "right" | "bottom" | "left";

export interface TooltipProps {
  content: ReactNode;
  children: ReactElement;
  side?: Side;
  /** Delay before showing (ms). Default 120. */
  delay?: number;
  className?: string;
  /** Classes for the outer wrapper span. Use to fix baseline / fill parent. */
  wrapperClassName?: string;
}

const wrapperClasses: Record<Side, string> = {
  top: "bottom-full left-1/2 mb-2 -translate-x-1/2",
  bottom: "top-full left-1/2 mt-2 -translate-x-1/2",
  left: "right-full top-1/2 mr-2 -translate-y-1/2",
  right: "left-full top-1/2 ml-2 -translate-y-1/2",
};

const transformOrigin: Record<Side, string> = {
  top: "center bottom",
  bottom: "center top",
  left: "right center",
  right: "left center",
};

// Offset is in the direction *away* from the trigger — content originates near
// the trigger and rises into resting position.
const offsetFrom: Record<Side, { x?: number; y?: number }> = {
  top: { y: 10 },
  bottom: { y: -10 },
  left: { x: 10 },
  right: { x: -10 },
};

function buildVariants(side: Side): Variants {
  const o = offsetFrom[side];
  return {
    initial: {
      opacity: 0,
      scale: 0.85,
      filter: "blur(10px)",
      x: o.x ?? 0,
      y: o.y ?? 0,
    },
    animate: {
      opacity: 1,
      scale: 1,
      filter: "blur(0px)",
      x: 0,
      y: 0,
      transition: {
        type: "spring",
        stiffness: 380,
        damping: 30,
        mass: 0.7,
        opacity: { duration: 0.22, ease: [0.16, 1, 0.3, 1] },
        filter: { duration: 0.3, ease: [0.16, 1, 0.3, 1] },
      },
    },
    exit: {
      opacity: 0,
      scale: 0.92,
      filter: "blur(6px)",
      x: (o.x ?? 0) * 0.6,
      y: (o.y ?? 0) * 0.6,
      transition: { duration: 0.14, ease: [0.16, 1, 0.3, 1] },
    },
  };
}

const REDUCED_VARIANTS: Variants = {
  initial: { opacity: 0 },
  animate: { opacity: 1, transition: { duration: 0.14, ease: [0.16, 1, 0.3, 1] } },
  exit: { opacity: 0, transition: { duration: 0.1, ease: [0.16, 1, 0.3, 1] } },
};

export function Tooltip({ content, children, side = "top", delay = 120, className, wrapperClassName }: TooltipProps) {
  const [open, setOpen] = useState(false);
  const id = useId();
  const timer = useRef<ReturnType<typeof setTimeout> | null>(null);
  const reduce = useReducedMotion();

  const show = () => {
    if (timer.current) clearTimeout(timer.current);
    timer.current = setTimeout(() => setOpen(true), delay);
  };
  const hide = () => {
    if (timer.current) {
      clearTimeout(timer.current);
      timer.current = null;
    }
    setOpen(false);
  };

  if (!isValidElement(children)) return children;

  const trigger = cloneElement(children as ReactElement<Record<string, unknown>>, {
    onMouseEnter: show,
    onMouseLeave: hide,
    onFocus: show,
    onBlur: hide,
    "aria-describedby": id,
  });

  const variants = reduce ? REDUCED_VARIANTS : buildVariants(side);

  return (
    <span className={cn("relative inline-flex align-middle", wrapperClassName)}>
      {trigger}
      <AnimatePresence mode="wait">
        {open ? (
          <span className={cn("pointer-events-none absolute z-50", wrapperClasses[side])}>
            <motion.span
              id={id}
              role="tooltip"
              variants={variants}
              initial="initial"
              animate="animate"
              exit="exit"
              style={{
                transformOrigin: transformOrigin[side],
                willChange: "transform, opacity, filter",
              }}
              className={cn(
                "block whitespace-nowrap rounded-lg px-2.5 py-1 text-xs font-medium text-(--color-fg) glass",
                className,
              )}
            >
              {content}
            </motion.span>
          </span>
        ) : null}
      </AnimatePresence>
    </span>
  );
}