"use client";

import { useRef, useState, type FocusEvent, type FormEvent, type KeyboardEvent } from "react";
import { AnimatePresence, motion, useReducedMotion } from "motion/react";

type LiquidSearchProps = {
  /** Called with the trimmed text when the search is sent (Enter or the search button). */
  onSearch?: (query: string) => void;
  /** Hint text in the open box. */
  placeholder?: string;
  /** Name read out by screen readers. */
  label?: string;
  /** Width in px when open. Never wider than its container. */
  width?: number;
  /** Start open. */
  defaultOpen?: boolean;
  /** Glow colour when open. */
  accent?: string;
  /** Box look. */
  className?: string;
};

function SearchIcon() {
  return (
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" className="size-5">
      <circle cx="11" cy="11" r="7" />
      <path d="m20 20-3.5-3.5" />
    </svg>
  );
}

/* LiquidSearch: a round search button that stretches into a search box with a wobbly, liquid spring. Esc or clicking away (when empty) folds it back. */
export function LiquidSearch({
  onSearch,
  placeholder = "Search…",
  label = "Search",
  width = 320,
  defaultOpen = false,
  accent = "#a78bfa",
  className = "border border-white/12 bg-[#141026] text-white",
}: LiquidSearchProps) {
  const reduce = useReducedMotion();
  const [open, setOpen] = useState(defaultOpen);
  const [query, setQuery] = useState("");
  const input = useRef<HTMLInputElement>(null);
  const button = useRef<HTMLButtonElement>(null);
  const spring = reduce ? { duration: 0 } : { type: "spring" as const, stiffness: 360, damping: 22, mass: 0.9 };

  const expand = () => {
    setOpen(true);
    requestAnimationFrame(() => input.current?.focus());
  };

  const collapse = (refocus: boolean) => {
    setOpen(false);
    setQuery("");
    if (refocus) button.current?.focus();
  };

  const submit = (e: FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    if (!open) return expand();
    const q = query.trim();
    if (q) onSearch?.(q);
    else input.current?.focus();
  };

  const onKey = (e: KeyboardEvent<HTMLInputElement>) => {
    if (e.key !== "Escape") return;
    e.preventDefault();
    if (query) setQuery("");
    else collapse(true);
  };

  const onBlur = (e: FocusEvent<HTMLFormElement>) => {
    if (!e.currentTarget.contains(e.relatedTarget as Node | null) && !query.trim()) collapse(false);
  };

  return (
    <motion.form
      role="search"
      onSubmit={submit}
      onBlur={onBlur}
      initial={false}
      animate={{
        width: open ? width : 48,
        scaleY: reduce ? 1 : open ? [1, 0.86, 1.04, 1] : [1, 0.9, 1],
        boxShadow: open ? `0 0 0 1px ${accent}55, 0 8px 32px -8px ${accent}88` : "0 0 0 0px transparent, 0 0 0 0 transparent",
      }}
      transition={{ width: spring, scaleY: { duration: reduce ? 0 : 0.45 }, boxShadow: { duration: reduce ? 0 : 0.3 } }}
      style={{ maxWidth: "100%" }}
      className={`relative flex h-12 items-center overflow-hidden rounded-full ${className}`}
    >
      <button
        ref={button}
        type="submit"
        aria-label={open ? label : `Open ${label.toLowerCase()}`}
        aria-expanded={open}
        className="grid size-12 shrink-0 place-items-center rounded-full text-white/70 outline-none transition-colors hover:text-white focus-visible:ring-2 focus-visible:ring-white/70 focus-visible:ring-inset"
      >
        <SearchIcon />
      </button>
      <div inert={!open} className="flex min-w-0 flex-1 items-center pr-1.5">
        <input
          ref={input}
          type="search"
          value={query}
          onChange={(e) => setQuery(e.target.value)}
          onKeyDown={onKey}
          placeholder={placeholder}
          aria-label={label}
          enterKeyHint="search"
          className="h-12 w-full min-w-0 bg-transparent text-base text-white outline-none placeholder:text-white/35 [&::-webkit-search-cancel-button]:appearance-none"
        />
        <AnimatePresence initial={false}>
          {open && query && (
            <motion.button
              key="clear"
              type="button"
              aria-label="Clear search"
              onClick={() => {
                setQuery("");
                input.current?.focus();
              }}
              initial={{ scale: 0, opacity: 0 }}
              animate={{ scale: 1, opacity: 1 }}
              exit={{ scale: 0, opacity: 0 }}
              transition={reduce ? { duration: 0 } : { type: "spring", stiffness: 500, damping: 28 }}
              className="grid size-9 shrink-0 place-items-center rounded-full text-white/60 outline-none hover:bg-white/10 hover:text-white focus-visible:ring-2 focus-visible:ring-white/70"
            >
              <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" className="size-4">
                <path d="M6 6l12 12M18 6 6 18" />
              </svg>
            </motion.button>
          )}
        </AnimatePresence>
      </div>
    </motion.form>
  );
}