"use client";

import { Pause, Play, Repeat2, ShoppingBag } from "lucide-react";
import { useEffect, useState } from "react";

export interface PreviewSet {
  theme: string;
  blurb: string;
  meals: { slot: string; title: string; cost: string }[];
  total: string;
  sharedItems: number;
  itemCount: number;
}

const INTERVAL_MS = 5000;

export function RotatingPreview({ sets }: { sets: PreviewSet[] }) {
  const [index, setIndex] = useState(0);
  const [paused, setPaused] = useState(false);
  const [hovering, setHovering] = useState(false);
  const running = !paused && !hovering;

  useEffect(() => {
    if (!running || window.matchMedia("(prefers-reduced-motion: reduce)").matches) return;
    const timer = window.setInterval(() => setIndex((i) => (i + 1) % sets.length), INTERVAL_MS);
    return () => window.clearInterval(timer);
  }, [running, index, sets.length]);

  const set = sets[index];

  return (
    <section
      aria-label="Example meal plans"
      className="relative"
      onMouseEnter={() => setHovering(true)}
      onMouseLeave={() => setHovering(false)}
      onFocus={() => setHovering(true)}
      onBlur={() => setHovering(false)}
    >
      {/* Architectural editorial frame — crisp 1px border & tactile offset shadow instead of blurred glow blobs */}
      <div className="rounded-xl border border-line-strong bg-surface shadow-[6px_6px_0_0_var(--color-line)]">
        {/* Top progress rule */}
        <div className="h-1 overflow-hidden rounded-t-xl bg-raised">
          <div
            key={index}
            className="h-full origin-left animate-preview-timer bg-brand-600"
            style={{ animationDuration: `${INTERVAL_MS}ms`, animationPlayState: running ? "running" : "paused" }}
          />
        </div>

        <div className="p-5 sm:p-6">
          <div key={set.theme} className="animate-fade-in">
            <div className="flex items-baseline justify-between gap-3 border-b border-line pb-3">
              <div>
                <p className="font-mono text-[11px] tracking-wider text-ink-faint uppercase">Sample menu · 2 people</p>
                <h2 className="mt-0.5 font-serif text-xl font-semibold tracking-tight text-ink">{set.theme}</h2>
              </div>
              <span className="rounded-md border border-line bg-raised px-2.5 py-1 text-xs font-medium text-ink-muted">
                {set.blurb}
              </span>
            </div>

            <ul className="divide-y divide-line">
              {set.meals.map((m) => (
                <li key={m.slot} className="flex items-baseline justify-between gap-4 py-3">
                  <div className="min-w-0">
                    <p className="font-mono text-[11px] tracking-wide text-ink-faint uppercase">{m.slot}</p>
                    <p className="truncate font-medium text-ink">{m.title}</p>
                  </div>
                  <p className="shrink-0 font-mono text-xs text-ink-muted tabular-nums">{m.cost}/meal</p>
                </li>
              ))}
            </ul>

            {/* Receipt tear-off footer */}
            <div className="receipt-rule mt-2 pt-3.5">
              <div className="flex flex-wrap items-center justify-between gap-2 rounded-lg bg-raised px-3.5 py-2.5 text-xs">
                <span className="inline-flex items-center gap-1.5 font-medium text-status-ok">
                  <Repeat2 className="size-3.5 shrink-0" strokeWidth={2} aria-hidden />
                  {set.sharedItems} shared store items
                </span>
                <span className="inline-flex items-center gap-1.5 font-mono font-semibold text-ink tabular-nums">
                  <ShoppingBag className="size-3.5 shrink-0 text-ink-muted" strokeWidth={1.75} aria-hidden />
                  {set.itemCount} pkgs · {set.total}
                </span>
              </div>
            </div>
          </div>

          {/* Accessible 40x40px pagination & playback controls */}
          <div className="mt-3 flex items-center justify-between border-t border-line pt-2">
            <div className="flex items-center">
              {sets.map((s, i) => (
                <button
                  key={s.theme}
                  type="button"
                  onClick={() => setIndex(i)}
                  aria-label={`Show example: ${s.theme}`}
                  aria-current={i === index}
                  className="grid size-9 place-items-center rounded-md hover:bg-raised"
                >
                  <span
                    className={`block h-2 rounded-full transition-all ${
                      i === index ? "w-5 bg-brand-600" : "w-2 bg-line-strong"
                    }`}
                  />
                </button>
              ))}
            </div>
            <button
              type="button"
              onClick={() => setPaused((p) => !p)}
              className="trim-cap inline-flex min-h-9 items-center gap-1.5 rounded-lg px-3 py-1.5 text-xs font-medium text-ink-muted transition-colors hover:bg-raised hover:text-ink"
            >
              {paused ? <Play className="size-3.5" aria-hidden /> : <Pause className="size-3.5" aria-hidden />}
              {paused ? "Play" : "Pause"}
            </button>
          </div>
        </div>
      </div>
    </section>
  );
}