/* global Phaser */

class MainMenuScene extends Phaser.Scene {
  constructor() {
    super({ key: 'MainMenuScene' });
  }

  create() {
    const { width, height } = this.sys.game.config;

    // Background
    const bg = this.add.graphics();
    bg.fillStyle(0x1a1a2e, 1);
    bg.fillRect(0, 0, width, height);
    bg.fillStyle(0x16213e, 1);
    bg.fillRect(0, height * 0.5, width, height * 0.5);

    // Title
    this.add.text(width / 2, height * 0.22, 'iPuzzle', {
      fontFamily: 'Georgia, serif',
      fontSize:   Math.round(height * 0.083) + 'px',
      color:      '#e0e0ff',
      stroke:     '#4444aa',
      strokeThickness: 6
    }).setOrigin(0.5);

    this.add.text(width / 2, height * 0.36, 'Put the pieces together', {
      fontFamily: 'Georgia, serif',
      fontSize:   Math.round(height * 0.026) + 'px',
      color:      '#8888bb'
    }).setOrigin(0.5);

    this._buildDomUI();
  }

  // ─── DOM UI ──────────────────────────────────────────────────────────

  _buildDomUI() {
    this._uiLayer = document.createElement('div');
    Object.assign(this._uiLayer.style, {
      position:      'fixed',
      top:           '50%',
      left:          '50%',
      transform:     'translate(-50%, -50%)',
      width:         '100vw',
      height:        '56.25vw',
      maxHeight:     '100vh',
      maxWidth:      '177.78vh',
      pointerEvents: 'none',
      zIndex:        '10',
    });
    document.body.appendChild(this._uiLayer);

    const newBtn = this._makeDomBtn('New Puzzle', '#1a3366', '#2255aa', '#66aaff', () => {
      this.scene.start('NewPuzzleScene');
    });
    Object.assign(newBtn.style, {
      top:       '55%',
      left:      '50%',
      transform: 'translateX(-50%)',
      width:     '18%',
    });
    this._uiLayer.appendChild(newBtn);

    const joinBtn = this._makeDomBtn('Join Puzzle', '#1a3322', '#225533', '#44aa66', () => {
      this._showComingSoon();
    });
    Object.assign(joinBtn.style, {
      top:       '70%',
      left:      '50%',
      transform: 'translateX(-50%)',
      width:     '18%',
    });
    this._uiLayer.appendChild(joinBtn);

    // Version credit — bottom right
    const credit = document.createElement('div');
    Object.assign(credit.style, {
      position:   'absolute',
      bottom:     '1%',
      right:      '0.6%',
      color:      '#333355',
      fontSize:   '1.2vmin',
      fontFamily: 'Arial, sans-serif',
    });
    credit.textContent = 'iPuzzle';
    this._uiLayer.appendChild(credit);

    this.events.once('shutdown', () => this._destroyDomUI());
  }

  _showComingSoon() {
    if (this._comingSoonEl) return;

    const overlay = document.createElement('div');
    Object.assign(overlay.style, {
      position:       'absolute',
      inset:          '0',
      background:     'rgba(0,0,0,0.6)',
      pointerEvents:  'auto',
      display:        'flex',
      alignItems:     'center',
      justifyContent: 'center',
    });

    const panel = document.createElement('div');
    Object.assign(panel.style, {
      background:   '#1a1a3e',
      border:       '2px solid #4444aa',
      borderRadius: '6px',
      padding:      '3vmin 4vmin',
      textAlign:    'center',
      display:      'flex',
      flexDirection:'column',
      gap:          '1.2vmin',
    });

    const msg = document.createElement('div');
    Object.assign(msg.style, { color: '#aaccff', fontSize: '2.4vmin', fontFamily: 'Arial, sans-serif' });
    msg.textContent = 'Multiplayer Coming Soon!';

    const sub = document.createElement('div');
    Object.assign(sub.style, { color: '#667799', fontSize: '1.5vmin', fontFamily: 'Arial, sans-serif' });
    sub.textContent = 'Click anywhere to dismiss';

    panel.appendChild(msg);
    panel.appendChild(sub);
    overlay.appendChild(panel);
    this._uiLayer.appendChild(overlay);
    this._comingSoonEl = overlay;

    overlay.addEventListener('click', () => {
      overlay.remove();
      this._comingSoonEl = null;
    });
  }

  _makeDomBtn(label, bgNormal, bgHover, borderColor, onClick) {
    const btn = document.createElement('button');
    btn.textContent = label;
    Object.assign(btn.style, {
      position:      'absolute',
      padding:       '1.2vmin 2vmin',
      background:    bgNormal,
      color:         '#ddeeff',
      border:        `2px solid ${borderColor}`,
      borderRadius:  '4px',
      fontSize:      '2vmin',
      fontFamily:    'Arial, sans-serif',
      cursor:        'pointer',
      pointerEvents: 'auto',
      whiteSpace:    'nowrap',
      textAlign:     'center',
    });
    btn.addEventListener('mouseenter', () => { btn.style.background = bgHover; });
    btn.addEventListener('mouseleave', () => { btn.style.background = bgNormal; });
    btn.addEventListener('mousedown',  () => { btn.style.transform = (btn.style.transform || '') + ' scale(0.97)'; });
    btn.addEventListener('mouseup',    () => { btn.style.transform = btn.style.transform.replace(' scale(0.97)', ''); });
    btn.addEventListener('click', onClick);
    return btn;
  }

  _destroyDomUI() {
    if (this._uiLayer && this._uiLayer.parentNode) {
      this._uiLayer.parentNode.removeChild(this._uiLayer);
    }
    this._uiLayer = null;
  }
}