"use client";

import { useId, type CSSProperties, type ElementType, type ReactNode } from "react";
import { motion, useReducedMotion } from "motion/react";

export type FeatureBentoItem = {
  title: string;
  text: string;
  /** A picture or small live demo at the top of the tile. Position it absolute to fill. */
  media?: ReactNode;
  /** small = 2 of 6 columns, wide = 4 columns, tall = 2 columns and 2 rows, full = 6 columns. */
  size?: "small" | "wide" | "tall" | "full";
  /** Makes the whole tile a link. */
  href?: string;
};

type FeatureBentoProps = {
  items: FeatureBentoItem[];
  title?: string;
  /** Small line above the title. */
  eyebrow?: string;
  subtitle?: string;
  /** Tile colour. */
  tile?: string;
  /** Tile edge colour on hover. */
  color?: string;
  /** h2 by default. */
  headingAs?: ElementType;
  /** Set padding and colours here. */
  className?: string;
};

const SIZES = {
  small: "@3xl:col-span-2",
  wide: "@3xl:col-span-4",
  tall: "@3xl:col-span-2 @3xl:row-span-2",
  full: "@3xl:col-span-6",
};

/* FeatureBento: tiles of mixed sizes on a 6-column grid. They rise in on scroll; on hover the tile lifts and its media grows. One column when narrow. */
export function FeatureBento({
  items,
  title,
  eyebrow,
  subtitle,
  tile = "#15122a",
  color = "#a78bfa",
  headingAs: Heading = "h2",
  className = "bg-[#0b0a14] px-5 py-16 text-white",
}: FeatureBentoProps) {
  const reduce = useReducedMotion();
  const id = useId();

  return (
    <section aria-labelledby={title ? id : undefined} className={`@container ${className}`}>
      {title && (
        <header className="mx-auto mb-8 max-w-2xl text-center">
          {eyebrow && <p className="mb-2 text-xs font-medium tracking-[0.2em] uppercase opacity-70">{eyebrow}</p>}
          <Heading id={id} className="text-[clamp(1.5rem,6cqw,2.5rem)] leading-tight font-semibold tracking-tight text-balance">
            {title}
          </Heading>
          {subtitle && <p className="mt-3 text-pretty opacity-70">{subtitle}</p>}
        </header>
      )}
      <ul className="mx-auto grid max-w-6xl grid-cols-1 gap-3 [grid-auto-flow:dense] @3xl:auto-rows-[minmax(13rem,auto)] @3xl:grid-cols-6 @3xl:gap-4">
        {items.map((item, i) => {
          const body = (
            <>
              {item.media && (
                <div className="relative min-h-28 flex-1 overflow-hidden transition-transform duration-500 ease-out group-hover/tile:scale-[1.04] motion-reduce:transition-none motion-reduce:group-hover/tile:scale-100">
                  {item.media}
                </div>
              )}
              <div className="p-4">
                <span className="block font-semibold">{item.title}</span>
                <span className="mt-1 block text-sm text-pretty opacity-70">{item.text}</span>
              </div>
            </>
          );
          return (
            <motion.li
              key={item.title}
              className={`group/tile overflow-hidden rounded-2xl border border-current/10 transition-[border-color,translate,box-shadow] duration-300 hover:-translate-y-1 hover:border-[var(--fb-edge)] hover:shadow-[0_18px_40px_-24px_var(--fb-edge)] focus-within:border-[var(--fb-edge)] motion-reduce:hover:translate-y-0 ${SIZES[item.size ?? "small"]}`}
              style={{ backgroundColor: tile, "--fb-edge": color } as CSSProperties}
              initial={reduce ? { opacity: 0 } : { opacity: 0, y: 20 }}
              whileInView={reduce ? { opacity: 1 } : { opacity: 1, y: 0 }}
              viewport={{ once: true, amount: 0.15 }}
              transition={{ duration: 0.6, delay: Math.min(i, 6) * 0.06, ease: [0.16, 1, 0.3, 1] }}
            >
              {item.href ? (
                <a href={item.href} className="flex h-full flex-col">
                  {body}
                </a>
              ) : (
                <div className="flex h-full flex-col">{body}</div>
              )}
            </motion.li>
          );
        })}
      </ul>
    </section>
  );
}