"use client";

import { useEffect, useState } from "react";
import { ArrowRight, RefreshCcw, Sparkles } from "lucide-react";
import Link from "next/link";
import { StoryBackdrop } from "@/components/marketing/StoryBackdrop";
import { randomStory, type GoalStory } from "@/lib/stories";

const askAnswers: [string, string][] = [
  ["Can I afford a $2,400 vacation in December?", "Yes — set aside $400/month starting now and your flex budget stays green the whole way."],
  ["When can I buy my first home?", "At your current savings pace, a 10% down payment on a $380k home is ~34 months out. Two changes could make it 26."],
  ["Which card should I use for groceries?", "Sapphire Preferred — 3x points beats your flat 2% card. Worth about $18 more this month."],
  ["When can I retire?", "Holding your 14% savings rate, a comfortable retirement at 63 is on track. Bump to 17% and it's 61."],
];

export function Hero() {
  const [story, setStory] = useState<GoalStory | null>(null);
  const [askIndex, setAskIndex] = useState(0);
  const [asked, setAsked] = useState<[string, string] | null>(null);
  const [input, setInput] = useState("");
  const [fadeOut, setFadeOut] = useState(false);

  useEffect(() => {
    setStory(randomStory());
    const t = setInterval(() => setAskIndex((i) => (i + 1) % askAnswers.length), 3500);
    return () => clearInterval(t);
  }, []);

  useEffect(() => {
    const storyInterval = setInterval(() => {
      setFadeOut(true);
      setTimeout(() => {
        setStory((s) => randomStory(s?.id));
        setFadeOut(false);
      }, 500);
    }, 5000);
    return () => clearInterval(storyInterval);
  }, []);

  const ask = () => {
    const typed = input.trim().toLowerCase();
    const match =
      askAnswers.find(([q]) => typed && q.toLowerCase().includes(typed.slice(0, 12))) ??
      askAnswers[askIndex];
    setAsked(match);
    setInput("");
  };

  return (
    <section className="relative isolate flex min-h-screen flex-col overflow-hidden bg-[#0A0A09]">
      {story && <div className={`transition-opacity duration-500 ${fadeOut ? 'opacity-0' : 'opacity-100'}`}><StoryBackdrop story={story} dim="soft" /></div>}
      {/* extra cinematic vignette */}
      <div className="pointer-events-none absolute inset-0 bg-[radial-gradient(85%_70%_at_50%_35%,transparent_40%,rgba(10,10,9,.75)_100%)]" />

      <div className="relative mx-auto flex w-full max-w-4xl flex-1 flex-col items-center justify-center px-5 pb-40 pt-32 text-center">
        <p className="font-mono text-[11px] uppercase tracking-[.3em] text-mint">
          Subscription-only · Zero ads · Zero referral bias
        </p>
        <h1 className="mt-6 font-display text-6xl leading-[1.02] text-paper md:text-[84px]">
          <em className="text-mint">Own</em> your story.
        </h1>
        <p className="mt-5 max-w-xl text-lg leading-8 text-paper/80">
          Aartha is the personal finance app that works only for you — budgets, credit,
          rewards, and an AI coach pointed at the life you&apos;re building.
        </p>

        {/* Ask Aartha — interactive, right in the hero */}
        <div className="mt-9 w-full max-w-xl">
          <div className="flex items-center gap-2 rounded-full border border-white/15 bg-[#0A0A09]/60 p-2 pl-5 backdrop-blur-md transition focus-within:border-mint/60">
            <Sparkles size={16} className="flex-none text-mint" />
            <input
              value={input}
              onChange={(e) => setInput(e.target.value)}
              onKeyDown={(e) => e.key === "Enter" && ask()}
              placeholder={askAnswers[askIndex][0]}
              className="w-full bg-transparent text-sm text-paper placeholder:text-paper/45 focus:outline-none"
            />
            <button
              onClick={ask}
              className="flex-none rounded-full bg-paper px-4 py-2.5 font-mono text-[11px] font-bold uppercase tracking-[.15em] text-ink transition hover:bg-mint"
            >
              Ask
            </button>
          </div>
          <p className="mt-3 font-mono text-[10px] uppercase tracking-[.25em] text-paper/40">
            Track everything · Ask anything · Trust the answer
          </p>
          {asked && (
            <div className="mt-4 animate-fadeUp rounded-lg border border-white/12 bg-[#0A0A09]/70 p-4 text-left backdrop-blur-md">
              <p className="font-mono text-[10px] uppercase tracking-[.2em] text-paper/45">{asked[0]}</p>
              <p className="mt-2 text-sm leading-6 text-paper/90">{asked[1]}</p>
              <p className="mt-2 text-[10px] text-paper/35">Sample answer · Educational guidance only, not regulated financial advice.</p>
            </div>
          )}
        </div>

        <div className="mt-9 flex items-center gap-3">
          <Link href="/dashboard" className="inline-flex items-center gap-2 rounded-full bg-mint px-6 py-3.5 text-sm font-bold text-ink transition hover:bg-paper">
            Get started <ArrowRight size={16} />
          </Link>
          <a href="#product" className="rounded-full border border-white/20 px-6 py-3.5 text-sm font-semibold text-paper/85 transition hover:border-white/50 hover:text-paper">
            See the product
          </a>
        </div>
      </div>

      {/* Story caption — the human moment behind this visit */}
      {story && (
        <div className={`absolute inset-x-0 bottom-0 z-10 border-t border-white/10 bg-gradient-to-t from-[#0A0A09] to-transparent transition-opacity duration-500 ${fadeOut ? 'opacity-0' : 'opacity-100'}`}>
          <div className="mx-auto flex max-w-7xl flex-wrap items-end justify-between gap-3 px-5 py-5">
            <div>
              <p className="font-mono text-[10px] uppercase tracking-[.25em] text-mint">{story.emoji} {story.tag} — a different story every visit</p>
              <p className="mt-1 font-display text-xl text-paper">{story.headline}</p>
            </div>
            <button
              onClick={() => setStory((s) => randomStory(s?.id))}
              className="inline-flex items-center gap-2 rounded-full border border-white/15 px-4 py-2 font-mono text-[10px] uppercase tracking-[.2em] text-paper/60 transition hover:border-white/40 hover:text-paper"
            >
              <RefreshCcw size={11} /> Another story
            </button>
          </div>
        </div>
      )}
    </section>
  );
}