// ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
// DONAU2SPACE // DEV ENTITY — Visual Effects
// ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

import { $, sleep, random, bus } from './utils.js';

// ── CSS class-based effects ────────────────────

export function glitch(ms = 850) {
  document.documentElement.classList.add('fx-glitch');
  setTimeout(() => document.documentElement.classList.remove('fx-glitch'), ms);
}

export function shake(ms = 520) {
  const card = $('.terminal-card');
  if (!card) return;
  card.classList.add('fx-shake');
  setTimeout(() => card.classList.remove('fx-shake'), ms);
}

export function blinkRed(ms = 2800) {
  document.body.classList.add('fx-blink-red');
  setTimeout(() => document.body.classList.remove('fx-blink-red'), ms);
}

export function scanPulse() {
  const sl = $('#scanlines');
  if (!sl) return;
  sl.classList.add('fx-scan-pulse');
  setTimeout(() => sl.classList.remove('fx-scan-pulse'), 1200);
}

// ── Screen tear (built with DOM, no innerHTML) ─

export async function screenTear(duration = 1500) {
  const tearEl = $('#screen-tear');
  if (!tearEl) return;
  tearEl.style.display = 'block';
  tearEl.replaceChildren();

  const strips = 12;
  for (let i = 0; i < strips; i++) {
    const offset = (Math.random() * 40 - 20) | 0;
    const h = (100 / strips).toFixed(2);
    const top = (i * 100 / strips).toFixed(2);
    const strip = document.createElement('div');
    strip.style.cssText = `position:absolute;top:${top}%;left:${offset}px;right:${-offset}px;height:${h}%;`
      + `background:rgba(${Math.random() > 0.5 ? '255,0,0' : '0,255,128'},0.04);`
      + `border-top:1px solid rgba(255,255,255,0.06);`;
    tearEl.appendChild(strip);
  }

  await sleep(duration);
  tearEl.replaceChildren();
  tearEl.style.display = 'none';
}

// ── Color shift ────────────────────────────────

const originalColors = {
  '--green': '#7ee787',
  '--blue': '#6cb6ff',
  '--pink': '#ff7ad9',
  '--yellow': '#ffcc66',
  '--red': '#ff4d4d',
  '--text': '#cfe3ff',
  '--bg': '#05070b',
  '--muted': '#7ea3c7',
};

export function shiftColors(intensity = 0.3) {
  const hueShift = random(-30, 30) * intensity;
  document.documentElement.style.filter = `hue-rotate(${hueShift}deg) saturate(${1 + intensity * 0.5})`;
}

export function resetColors() {
  document.documentElement.style.filter = '';
  const root = document.documentElement;
  for (const [k, v] of Object.entries(originalColors)) {
    root.style.setProperty(k, v);
  }
}

export function setTheme(name) {
  const root = document.documentElement;
  const themes = {
    neon: { '--green': '#7ee787', '--blue': '#6cb6ff', '--pink': '#ff7ad9' },
    calm: { '--green': '#9ad7ff', '--blue': '#b4f0c2', '--pink': '#ffd1a6' },
    doom: { '--green': '#ffcc66', '--blue': '#ff4d4d', '--pink': '#ff4d4d' },
    void: { '--green': '#4a6670', '--blue': '#3d5a6e', '--pink': '#6e3d5a', '--text': '#8ea8b8' },
    matrix: { '--green': '#00ff41', '--blue': '#00ff41', '--pink': '#00ff41', '--text': '#00ff41', '--muted': '#008f11' },
  };
  const t = themes[name];
  if (!t) return false;
  for (const [k, v] of Object.entries(t)) root.style.setProperty(k, v);
  return true;
}

// ── Reality Shift sequence ─────────────────────

export async function realityShift() {
  bus.emit('reality-shift-start');

  // Phase 1: Color distortion
  shiftColors(0.8);
  await sleep(800);

  // Phase 2: Typography chaos
  document.body.classList.add('fx-typo-shift');
  await sleep(600);

  // Phase 3: Screen tear
  screenTear(1200);
  glitch(1200);
  shake(400);
  await sleep(1400);

  // Phase 4: Fake error flash
  const overlay = $('#reality-overlay');
  if (overlay) {
    overlay.style.display = 'flex';
    overlay.replaceChildren();
    const errors = [
      'SEGFAULT at 0x00000DEV',
      'kernel panic - not syncing: VFS unable to mount root fs',
      'ERROR: reality.sys corrupted',
      'WARNING: timeline integrity at 12%',
      'FATAL: narrative overflow in dev_entity.consciousness',
    ];
    for (const err of errors) {
      const div = document.createElement('div');
      div.textContent = err;
      overlay.appendChild(div);
      await sleep(200);
    }
    await sleep(1000);
    overlay.style.display = 'none';
  }

  // Phase 5: Brief blackout
  document.body.classList.add('fx-blackout');
  await sleep(400);
  document.body.classList.remove('fx-blackout');

  // Phase 6: Rebuild
  document.body.classList.remove('fx-typo-shift');
  resetColors();
  await sleep(300);

  bus.emit('reality-shift-end');
}

// ── Overlay management ─────────────────────────

export function showOverlay(text) {
  const overlay = $('#overlay');
  const overlayText = $('#overlay-text');
  if (!overlay || !overlayText) return;
  overlayText.textContent = text;
  overlay.style.display = 'flex';
}

export function hideOverlay() {
  const overlay = $('#overlay');
  if (overlay) overlay.style.display = 'none';
}

export function isOverlayVisible() {
  const overlay = $('#overlay');
  return overlay && overlay.style.display === 'flex';
}

// ── Matrix rain (CSS-based, lightweight) ───────

let matrixInterval = null;

export function startMatrixRain() {
  const el = $('#matrix-rain');
  if (!el) return;
  const charset = '01$#@*+^%&()[]{}<>/\\|;:,.=ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  matrixInterval = setInterval(() => {
    let out = '';
    for (let i = 0; i < 300; i++) {
      out += charset[(Math.random() * charset.length) | 0];
      if (i % 55 === 0) out += '\n';
    }
    el.textContent = out;
  }, 180);
}

export function stopMatrixRain() {
  if (matrixInterval) clearInterval(matrixInterval);
  const el = $('#matrix-rain');
  if (el) el.textContent = '';
}

export function setMatrixOpacity(val) {
  const el = $('#matrix-rain');
  if (el) el.style.opacity = val;
}