'use client';

import { useEffect, useState, type SyntheticEvent } from 'react';
import clsx from 'clsx';
import { CheckCircleIcon, XCircleIcon, BanknotesIcon } from '@heroicons/react/24/outline';
import type { SessionEntry } from './SessionSheet';

// Full-screen outcome after a door action. At a loud, dark door a row flash and
// a small toast are too easy to miss; a screen that is entirely green or
// entirely red answers "is this person in or not?" from across the table.
//
// It never traps the queue: tapping anywhere closes it, and it closes itself
// after a few seconds. The undo affordance survives the close — the page shows
// the bottom Undo toast for whatever is left of the window.

export type DoorResultKind = 'success' | 'already_in' | 'not_found' | 'unpaid' | 'failed';

export interface DoorResult {
  kind: DoorResultKind;
  /** Headline: the attendee's name, or a short verdict when there is no one. */
  name: string;
  /** Second line: "Checked in 19:42 · paid cash", "Already in at 19:42", "Collect ₲60.000". */
  detail?: string;
  /** Success only — drives Undo and the post-close toast. */
  entry?: SessionEntry;
}

// Success needs no reading; the red ones carry a time or an amount the staff
// member has to relay to the person, so they get a little longer.
export const RESULT_AUTO_CLOSE_MS: Record<DoorResultKind, number> = {
  success: 4000,
  already_in: 6000,
  not_found: 6000,
  unpaid: 6000,
  failed: 6000,
};

const SURFACE: Record<DoorResultKind, { bg: string; text: string; icon: typeof CheckCircleIcon; title: string }> = {
  success: { bg: 'bg-emerald-600', text: 'text-emerald-700', icon: CheckCircleIcon, title: 'Checked in' },
  already_in: { bg: 'bg-red-600', text: 'text-red-700', icon: XCircleIcon, title: 'Already checked in' },
  not_found: { bg: 'bg-red-600', text: 'text-red-700', icon: XCircleIcon, title: 'Not found' },
  unpaid: { bg: 'bg-amber-600', text: 'text-amber-700', icon: BanknotesIcon, title: 'Payment due' },
  failed: { bg: 'bg-red-700', text: 'text-red-800', icon: XCircleIcon, title: 'NOT checked in' },
};

export function ResultScreen({
  result,
  onClose,
  onUndo,
}: {
  result: DoorResult;
  onClose: () => void;
  onUndo: () => void;
}) {
  const surface = SURFACE[result.kind];
  const duration = RESULT_AUTO_CLOSE_MS[result.kind];
  // Toggled after mount so the fade-in and the countdown bar both animate from
  // their starting state instead of appearing already finished.
  const [shown, setShown] = useState(false);

  // Keyed on the result identity: a success that flips to failed restarts both
  // the fade and the countdown for the new state.
  const identity = `${result.kind}:${result.entry?.idempotencyKey ?? result.name}`;

  useEffect(() => {
    setShown(false);
    const raf = requestAnimationFrame(() => setShown(true));
    const timer = setTimeout(onClose, duration);
    return () => {
      cancelAnimationFrame(raf);
      clearTimeout(timer);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [identity]);

  const stop = (e: SyntheticEvent) => e.stopPropagation();
  const Icon = surface.icon;

  return (
    <div
      role="dialog"
      aria-live="assertive"
      onClick={onClose}
      className={clsx(
        'fixed inset-0 z-50 flex flex-col text-white select-none transition-opacity duration-150',
        surface.bg,
        shown ? 'opacity-100' : 'opacity-0',
      )}
      style={{ paddingTop: 'env(safe-area-inset-top)', paddingBottom: 'env(safe-area-inset-bottom)' }}
    >
      <div className="flex-1 flex flex-col items-center justify-center px-6 text-center">
        <div className="w-24 h-24 rounded-full bg-white/20 flex items-center justify-center mb-6">
          <Icon className="w-16 h-16" />
        </div>
        <p className="text-sm uppercase tracking-widest text-white/70 mb-2">{surface.title}</p>
        <h2 className="text-3xl font-bold leading-tight break-words max-w-full">{result.name}</h2>
        {result.detail && <p className="text-white/85 text-xl mt-3">{result.detail}</p>}
        <p className="text-white/50 text-sm mt-8">Tap anywhere to continue</p>
      </div>

      <div className="px-6 pb-6 flex gap-3">
        {result.kind === 'success' && (
          <button
            onClick={(e) => { stop(e); onUndo(); }}
            className="flex-1 min-h-[56px] rounded-2xl bg-white/20 text-white text-xl font-bold active:scale-[0.98] transition-transform"
          >
            Undo
          </button>
        )}
        <button
          onClick={(e) => { stop(e); onClose(); }}
          className={clsx(
            'flex-1 min-h-[56px] rounded-2xl bg-white text-xl font-bold active:scale-[0.98] transition-transform',
            surface.text,
          )}
        >
          {result.kind === 'unpaid' ? 'Collect' : 'Close'}
        </button>
      </div>

      {/* Countdown to auto-close, so the screen vanishing never surprises anyone. */}
      <div className="h-1 bg-white/20">
        <div
          key={identity}
          className="h-full bg-white/70"
          style={{
            width: shown ? '0%' : '100%',
            transition: shown ? `width ${duration}ms linear` : 'none',
          }}
        />
      </div>
    </div>
  );
}