import { useState, useEffect } from 'react';
import { Link, useLocation } from 'react-router-dom';
import { X, Radio, Pencil } from 'lucide-react';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useLocalStorage } from '@/hooks/useLocalStorage';
import { NEWSLETTER_ISSUES } from '@/pages/NewsletterPage';

// ─── Config ──────────────────────────────────────────────────────────────────

/**
 * Only these two pubkeys see the Monday "write newsletter" reminder.
 * Everyone else sees nothing.
 */
const NEWSLETTER_ADMIN_PUBKEYS = [
  '20e7c953439e66f3882ab96fe0faa8ba246d6fb12c03b0cb4e2dc4623b8bcb21', // SkateSpots founder — npub1yrnuj56rnen08zp2h9h7p74ghgjx6ma39spmpj6w9hzxywutevsst7k5cx
  'caba497f7beda0650d6b78ab211216e4d2ebabeec9ca6eb2a05cee8e55c6871b', // npub1e2ayjlmmaksx2rtt0z4jzyskunfwh2lwe89xav4qtnhgu4wxsudsp98a4l
];

/**
 * How many days the "Latest Drop" pill stays visible after a new issue.
 * After this window it auto-hides until the next issue drops.
 */
const PILL_VISIBLE_DAYS = 7;

/**
 * Pre-filled Shakespeare chat URL that opens ready to write the next newsletter.
 * When you click it on a Monday, it takes you straight into the AI with the
 * prompt already typed — just hit send.
 */
const SHAKESPEARE_PROMPT = encodeURIComponent(
  'Write this week\'s SkateSpots newsletter issue. Read the git log for the past 7 days, summarize all changes in plain skater language, pick a spot of the week if any new ones were submitted, and format it following the same structure as Issue #001. Keep it short, punchy, no corporate tone.'
);
const WRITE_NEWSLETTER_URL = `https://shakespeare.diy/project/skatespots?prompt=${SHAKESPEARE_PROMPT}`;

// ─── Helpers ─────────────────────────────────────────────────────────────────

function isMonday(): boolean {
  return new Date().getDay() === 1;
}

function daysSinceIssue(isoDate: string): number {
  const issued = new Date(isoDate).getTime();
  const now = Date.now();
  return Math.floor((now - issued) / (1000 * 60 * 60 * 24));
}

function formatIssueNumber(n: number): string {
  return `#${String(n).padStart(3, '0')}`;
}

// ─── Floating "Latest Drop" pill ─────────────────────────────────────────────

function LatestDropPill() {
  const location = useLocation();
  const latest = NEWSLETTER_ISSUES[0];
  const age = daysSinceIssue(latest.date);
  const [dismissed, setDismissed] = useLocalStorage<number>(
    'newsletter-pill-dismissed-issue',
    0
  );

  // Hide on newsletter page, map page (to avoid conflicts with map UI), if too old, or if already dismissed
  const isMapPage = location.pathname === '/' || location.pathname === '/map';
  if (
    location.pathname === '/newsletter' ||
    isMapPage ||
    age > PILL_VISIBLE_DAYS ||
    dismissed === latest.number
  ) {
    return null;
  }

  return (
    <div className="fixed bottom-[calc(4.75rem+env(safe-area-inset-bottom,0px))] md:bottom-6 right-3 z-40 flex items-center gap-1.5 animate-in slide-in-from-bottom-4 duration-300 max-w-[calc(100vw-1.5rem)]">
      <Link
        to="/newsletter"
        className="flex items-center gap-2 pl-3 pr-3 py-2 rounded-full bg-black/98 border border-[#ccff00]/50 shadow-lg shadow-[#ccff00]/10 hover:border-[#ccff00] transition-all active:scale-95 touch-manipulation"
      >
        <Radio className="h-3.5 w-3.5 text-[#ccff00] animate-pulse flex-shrink-0" />
        <span className="text-xs font-black text-[#ccff00] uppercase tracking-wide whitespace-nowrap">
          Drop {formatIssueNumber(latest.number)} is out
        </span>
        <span className="text-[10px] text-gray-500 hidden sm:inline">
          · {age === 0 ? 'Today' : age === 1 ? 'Yesterday' : `${age}d ago`}
        </span>
      </Link>
      <button
        onClick={() => setDismissed(latest.number)}
        className="flex items-center justify-center w-7 h-7 flex-shrink-0 rounded-full bg-black/98 border border-white/10 text-gray-500 hover:text-white hover:border-white/30 transition-colors touch-manipulation active:scale-95"
        aria-label="Dismiss"
      >
        <X className="h-3 w-3" />
      </button>
    </div>
  );
}

// ─── Monday admin reminder ────────────────────────────────────────────────────

function MondayAdminReminder() {
  const { user } = useCurrentUser();
  const location = useLocation();
  const [dismissed, setDismissed] = useLocalStorage<string>(
    'newsletter-monday-dismissed',
    ''
  );

  // Today's date key — so it only shows once per Monday, not every page load
  const todayKey = new Date().toISOString().slice(0, 10);
  const isAdmin = NEWSLETTER_ADMIN_PUBKEYS.includes(user?.pubkey ?? '');
  const alreadyDismissedToday = dismissed === todayKey;

  if (
    !isAdmin ||
    !isMonday() ||
    alreadyDismissedToday ||
    location.pathname === '/newsletter'
  ) {
    return null;
  }

  return (
    <div className="fixed top-20 md:top-20 right-4 z-50 max-w-xs animate-in slide-in-from-right-4 duration-300">
      <div className="bg-black/98 border-2 border-[#ccff00]/60 rounded-2xl shadow-2xl shadow-[#ccff00]/10 p-4">
        <div className="flex items-start gap-3">
          <div className="w-8 h-8 rounded-xl bg-[#ccff00]/15 flex items-center justify-center flex-shrink-0">
            <Pencil className="h-4 w-4 text-[#ccff00]" />
          </div>
          <div className="flex-1 min-w-0">
            <p className="text-[#ccff00] font-black text-xs uppercase tracking-wide mb-1">
              It's Monday
            </p>
            <p className="text-gray-300 text-xs leading-relaxed mb-3">
              Time to drop the weekly newsletter. One click and the AI writes it from the git log.
            </p>
            <a
              href={WRITE_NEWSLETTER_URL}
              target="_blank"
              rel="noopener noreferrer"
              className="flex items-center justify-center gap-2 w-full py-2 rounded-xl bg-[#ccff00] text-black text-xs font-black uppercase tracking-wide hover:bg-[#ccff00]/90 transition-colors"
              onClick={() => setDismissed(todayKey)}
            >
              <Pencil className="h-3.5 w-3.5" />
              Write Drop #{String(NEWSLETTER_ISSUES[0].number + 1).padStart(3, '0')}
            </a>
          </div>
          <button
            onClick={() => setDismissed(todayKey)}
            className="flex-shrink-0 text-gray-600 hover:text-gray-400 transition-colors"
            aria-label="Dismiss reminder"
          >
            <X className="h-4 w-4" />
          </button>
        </div>
      </div>
    </div>
  );
}

// ─── Combined overlay export ──────────────────────────────────────────────────

export function NewsletterOverlay() {
  const [mounted, setMounted] = useState(false);

  // Avoid SSR hydration mismatch — only render client-side
  useEffect(() => { setMounted(true); }, []);
  if (!mounted) return null;

  return (
    <>
      <LatestDropPill />
      <MondayAdminReminder />
    </>
  );
}