import { el, clear, onTeardown } from '../lib/dom.js';
import { loadSnapshot } from '../data/snapshot.js';
import { Sprite } from '../components/Sprite.js';
import { whosThat, recordResult } from '../store/whosThat.js';
import { prefersReducedMotion } from '../store/settings.js';

const loose = (s) => s.toLowerCase().replace(/[^a-z0-9]/g, '');
const pretty = (name) => name.replace(/-/g, ' ');

/**
 * Hidden mini-game — reachable by the Konami code (↑↑↓↓←→←→BA) or seven
 * quick taps on the nav wordmark, and by the bare #/whos-that hash once
 * you know it. Guess the Pokémon from its silhouette.
 */
export async function WhosThatView() {
  const view = el('section', { class: 'view wtp' });
  const snap = await loadSnapshot();
  const pool = snap.species;

  let current = null;
  let revealed = false;
  let wrong = 0;
  let streak = 0;

  const art = el('div', { class: 'wtp__art' });
  const caption = el('div', { class: 'wtp__caption' }, 'Who’s that Pokémon?');
  const hint = el('div', { class: 'wtp__hint' });
  const feedback = el('div', { class: 'wtp__feedback' });
  const scoreEl = el('div', { class: 'wtp__score' });

  const input = el('input', {
    class: 'wtp__input',
    type: 'text',
    placeholder: 'Your guess…',
    autocomplete: 'off',
    autocapitalize: 'off',
    autocorrect: 'off',
    spellcheck: 'false',
    onkeydown: (e) => {
      if (e.key === 'Enter') submitGuess();
    },
  });

  const guessBtn = el(
    'button',
    { class: 'button wtp__go', type: 'button', onclick: submitGuess },
    'Guess',
  );
  const revealBtn = el(
    'button',
    { class: 'button button--ghost', type: 'button', onclick: () => reveal(false) },
    'Reveal',
  );
  const nextBtn = el('button', { class: 'button', type: 'button', onclick: next }, 'Next →');

  function renderScore() {
    const s = whosThat.get();
    const pct = s.plays ? Math.round((s.wins / s.plays) * 100) : 0;
    clear(scoreEl).append(
      el('span', { class: 'wtp__pill' }, `Streak ${streak}`),
      el('span', { class: 'wtp__pill' }, `Best ${s.best}`),
      el('span', { class: 'wtp__pill wtp__pill--dim' }, `${s.wins}/${s.plays} · ${pct}%`),
    );
  }

  function syncButtons() {
    input.hidden = revealed;
    guessBtn.hidden = revealed;
    revealBtn.hidden = revealed;
    nextBtn.hidden = !revealed;
  }

  function next() {
    current = pool[Math.floor(Math.random() * pool.length)];
    revealed = false;
    wrong = 0;
    art.classList.remove('is-revealed');
    clear(art).append(Sprite(current.id, { style: 'official', size: 260, alt: 'Mystery Pokémon' }));
    caption.textContent = 'Who’s that Pokémon?';
    hint.textContent = '';
    feedback.textContent = '';
    feedback.className = 'wtp__feedback';
    input.value = '';
    syncButtons();
    input.focus();
  }

  function reveal(win) {
    revealed = true;
    art.classList.add('is-revealed');
    caption.textContent = `It’s ${pretty(current.name)}!  #${String(current.id).padStart(4, '0')}`;
    if (win) {
      streak += 1;
      feedback.textContent = wrong === 0 ? 'Nailed it!' : 'Got there!';
      feedback.className = 'wtp__feedback is-good';
    } else {
      streak = 0;
      feedback.textContent = 'That one got away.';
      feedback.className = 'wtp__feedback is-bad';
    }
    recordResult(win, streak);
    renderScore();
    syncButtons();
    if (win && !prefersReducedMotion()) {
      art.animate(
        [{ transform: 'scale(0.9)' }, { transform: 'scale(1.05)' }, { transform: 'scale(1)' }],
        { duration: 380, easing: 'cubic-bezier(.34,1.4,.64,1)' },
      );
    }
    nextBtn.focus();
  }

  function submitGuess() {
    if (revealed || !input.value.trim()) return;
    if (loose(input.value) === loose(current.name)) {
      reveal(true);
      return;
    }
    wrong += 1;
    input.value = '';
    feedback.className = 'wtp__feedback is-bad';
    if (wrong === 1) {
      feedback.textContent = 'Nope — try again.';
      hint.textContent = `${loose(current.name).length} letters`;
    } else if (wrong === 2) {
      feedback.textContent = 'Last clue…';
      hint.textContent = `Starts with “${current.name[0].toUpperCase()}”, ${loose(current.name).length} letters`;
    } else {
      reveal(false); // three strikes
      return;
    }
    input.focus();
  }

  view.append(
    el('nav', { class: 'lookup__nav' }, el('a', { class: 'link', href: '#/' }, '‹ Dex')),
    el(
      'header',
      { class: 'view__header' },
      el('h1', {}, 'Who’s that Pokémon?'),
      el('p', {}, 'Name it from the silhouette. Three misses and it’s revealed.'),
    ),
    scoreEl,
    el('div', { class: 'wtp__stage' }, art),
    caption,
    hint,
    el('div', { class: 'wtp__controls' }, input, guessBtn, revealBtn, nextBtn),
    feedback,
  );

  renderScore();
  next();

  const off = whosThat.subscribe(() => {
    if (revealed) renderScore();
  });
  onTeardown(view, off);
  return view;
}