function setMsg(target, text, ok) {
  const el = document.getElementById('msg-' + target);
  el.textContent = text;
  el.className = 'msg ' + (ok ? 'ok' : 'err');
}

async function upload(target) {
  const file = document.getElementById('file-' + target).files[0];
  const btn = document.getElementById('btn-' + target);
  const origText = btn.textContent;
  const msg = t => setMsg(target, t, false);
  if (!file) { msg('Először válassz egy új PNG fájlt a mentéshez.'); return; }
  if (file.type !== 'image/png') { msg('Csak PNG fájl tölthető fel.'); return; }
  if (file.size > 1024 * 1024) { msg('A fájl nagyobb, mint 1 MB.'); return; }
  btn.disabled = true;
  btn.textContent = '⏳ Mentés folyamatban...';
  try {
    const bytes = new Uint8Array(await file.arrayBuffer());
    await sendLogoBinary(target, bytes);
  } catch (e) { msg('❌ Hálózati hiba mentés közben'); }
  btn.disabled = false;
  btn.textContent = origText;
}

async function sendLogoBinary(target, bytes) {
  const res = await fetch('/logo?target=' + target, {
    method: 'POST',
    headers: { 'Content-Type': 'image/png', 'X-CSRF-Token': CSRF_TOKEN },
    body: bytes
  });
  if (res.status === 401) { location.href = '/login'; return; }
  const json = await res.json();
  if (json.ok) {
    setMsg(target, '✅ Logó sikeresen elmentve! (A weboldalon a Publikálás után jelenik meg.)', true);
    const variantParam = target === 'header' ? 'variant=header&' : '';
    document.getElementById('prev-' + target).src = '/logo.png?' + variantParam + 't=' + Date.now();
    const meta = document.getElementById('meta-' + target);
    if (meta) meta.textContent = 'Módosítva (' + (bytes.length / 1024).toFixed(1) + ' KB) — elmentve';
  } else setMsg(target, '❌ ' + json.error, false);
}

document.querySelectorAll('input[type=file]').forEach(inp => {
  inp.addEventListener('change', () => {
    const target = inp.id.replace('file-', '');
    const f = inp.files[0];
    const meta = document.getElementById('meta-' + target);
    const prev = document.getElementById('prev-' + target);
    if (!f) return;
    if (f.type !== 'image/png') {
      setMsg(target, 'Csak PNG formátumú kép választható ki.', false);
      if (meta) meta.textContent = '';
      return;
    }
    if (f.size > 1024 * 1024) {
      setMsg(target, 'A fájl nagyobb 1 MB-nál.', false);
      if (meta) meta.textContent = '';
      return;
    }
    setMsg(target, 'Új fájl kiválasztva. Kattints a Mentés vagy a ✏️ Szerkesztés gombra.', true);
    if (meta) meta.textContent = f.name + ' — ' + (f.size / 1024).toFixed(1) + ' KB (még nincs mentve)';
    prev.src = URL.createObjectURL(f);
  });
});

/* ── Interactive Canvas Editor Logic ────────────────────────────── */
let currentEditTarget = 'header';
let editImg = new Image();
let editState = {
  zoom: 1, panX: 0, panY: 0, rotation: 0,
  flipH: 1, flipV: 1, padding: 0, aspect: 0,
  brightness: 100, contrast: 100, invert: false
};
const canvas = document.getElementById('edit-canvas');
const ctx = canvas.getContext('2d');
const wrap = document.getElementById('canvas-wrap');
let isDragging = false, startX = 0, startY = 0;

function openEditor(target) {
  currentEditTarget = target;
  document.getElementById('modal-title').textContent = '🎨 Logó szerkesztése — ' + (target === 'header' ? 'Weboldal fejléc' : 'CMS ikon');
  editState.aspect = (target === 'icon' ? 1 : 0);
  updateAspectBtns();
  resetFilters();
  resetPan();

  const fileInput = document.getElementById('file-' + target);
  if (fileInput.files && fileInput.files[0]) {
    const reader = new FileReader();
    reader.onload = e => { loadImg(e.target.result); };
    reader.readAsDataURL(fileInput.files[0]);
  } else {
    const previewSrc = document.getElementById('prev-' + target).src;
    loadImg(previewSrc);
  }
}

function loadImg(src) {
  editImg = new Image();
  editImg.crossOrigin = 'anonymous';
  editImg.onload = () => {
    document.getElementById('editor-modal').classList.add('open');
    fitToCrop();
    render();
  };
  editImg.src = src;
}

function closeEditor() {
  document.getElementById('editor-modal').classList.remove('open');
}

function setAspect(ratio) {
  editState.aspect = ratio;
  updateAspectBtns();
  render();
}

function updateAspectBtns() {
  document.querySelectorAll('#aspect-btns button').forEach(b => {
    const a = parseFloat(b.dataset.aspect);
    b.classList.toggle('active', (editState.aspect === 0 && a === 0) || (Math.abs(editState.aspect - a) < 0.01));
  });
}

function setZoom(val) {
  editState.zoom = parseFloat(val);
  document.getElementById('zoom-val').textContent = Math.round(editState.zoom * 100) + '%';
  render();
}

function setPadding(val) {
  editState.padding = parseInt(val, 10);
  document.getElementById('pad-val').textContent = editState.padding + 'px';
  render();
}

function setFilter(name, val) {
  editState[name] = parseInt(val, 10);
  document.getElementById(name.slice(0, 6) + '-val').textContent = val + '%';
  render();
}

function toggleInvert() {
  editState.invert = !editState.invert;
  document.getElementById('btn-invert').classList.toggle('active', editState.invert);
  render();
}

function resetFilters() {
  editState.brightness = 100; editState.contrast = 100; editState.invert = false; editState.padding = 0;
  document.getElementById('bright-range').value = 100; document.getElementById('bright-val').textContent = '100%';
  document.getElementById('contrast-range').value = 100; document.getElementById('contrast-val').textContent = '100%';
  document.getElementById('pad-range').value = 0; document.getElementById('pad-val').textContent = '0px';
  document.getElementById('btn-invert').classList.remove('active');
  render();
}

function rotate(deg) {
  editState.rotation = (editState.rotation + deg) % 360;
  render();
}

function toggleFlip(dir) {
  if (dir === 'h') editState.flipH *= -1;
  if (dir === 'v') editState.flipV *= -1;
  render();
}

function resetPan() {
  editState.panX = 0; editState.panY = 0;
  render();
}

function getCropRect() {
  const cw = canvas.width, ch = canvas.height;
  let rw = cw * 0.85, rh = ch * 0.85;
  if (editState.aspect > 0) {
    if (rw / rh > editState.aspect) rw = rh * editState.aspect;
    else rh = rw / editState.aspect;
  }
  return { x: (cw - rw) / 2, y: (ch - rh) / 2, w: rw, h: rh };
}

function fitToCrop() {
  if (!editImg.width || !editImg.height) return;
  const crop = getCropRect();
  const isRotated = Math.abs(editState.rotation) === 90 || Math.abs(editState.rotation) === 270;
  const iw = isRotated ? editImg.height : editImg.width;
  const ih = isRotated ? editImg.width : editImg.height;
  const scale = Math.min(crop.w / iw, crop.h / ih);
  editState.zoom = Math.max(0.3, Math.min(3, scale));
  document.getElementById('zoom-range').value = editState.zoom;
  document.getElementById('zoom-val').textContent = Math.round(editState.zoom * 100) + '%';
  editState.panX = 0; editState.panY = 0;
  render();
}

function render() {
  if (!editImg.width) return;
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  const crop = getCropRect();

  // Draw image
  ctx.save();
  ctx.filter = 'brightness(' + editState.brightness + '%) contrast(' + editState.contrast + '%)' + (editState.invert ? ' invert(100%)' : '');
  ctx.translate(canvas.width / 2 + editState.panX, canvas.height / 2 + editState.panY);
  ctx.rotate((editState.rotation * Math.PI) / 180);
  ctx.scale(editState.zoom * editState.flipH, editState.zoom * editState.flipV);
  
  const pad = editState.padding / (editState.zoom || 1);
  const dw = Math.max(10, editImg.width - pad * 2);
  const dh = Math.max(10, editImg.height - pad * 2);
  ctx.drawImage(editImg, -dw / 2, -dh / 2, dw, dh);
  ctx.restore();

  // Dark overlay outside crop rect
  ctx.save();
  ctx.fillStyle = 'rgba(15, 17, 23, 0.75)';
  ctx.fillRect(0, 0, canvas.width, crop.y);
  ctx.fillRect(0, crop.y + crop.h, canvas.width, canvas.height - (crop.y + crop.h));
  ctx.fillRect(0, crop.y, crop.x, crop.h);
  ctx.fillRect(crop.x + crop.w, crop.y, canvas.width - (crop.x + crop.w), crop.h);

  // Crop border
  ctx.strokeStyle = '#3b82f6';
  ctx.lineWidth = 2;
  ctx.setLineDash([6, 4]);
  ctx.strokeRect(crop.x, crop.y, crop.w, crop.h);
  ctx.restore();
}

// Drag & Pan handlers
wrap.addEventListener('mousedown', e => { isDragging = true; startX = e.clientX - editState.panX; startY = e.clientY - editState.panY; wrap.classList.add('grabbing'); });
window.addEventListener('mousemove', e => { if (!isDragging) return; editState.panX = e.clientX - startX; editState.panY = e.clientY - startY; render(); });
window.addEventListener('mouseup', () => { isDragging = false; wrap.classList.remove('grabbing'); });
wrap.addEventListener('wheel', e => {
  e.preventDefault();
  const delta = e.deltaY < 0 ? 0.05 : -0.05;
  setZoom(Math.max(0.3, Math.min(3, editState.zoom + delta)));
  document.getElementById('zoom-range').value = editState.zoom;
}, { passive: false });

async function saveEditedLogo() {
  const crop = getCropRect();
  const outCanvas = document.createElement('canvas');
  outCanvas.width = Math.round(crop.w * 2); // 2x for retina sharpness
  outCanvas.height = Math.round(crop.h * 2);
  const octx = outCanvas.getContext('2d');

  octx.save();
  octx.scale(2, 2);
  octx.translate(-crop.x, -crop.y);
  octx.filter = 'brightness(' + editState.brightness + '%) contrast(' + editState.contrast + '%)' + (editState.invert ? ' invert(100%)' : '');
  octx.translate(canvas.width / 2 + editState.panX, canvas.height / 2 + editState.panY);
  octx.rotate((editState.rotation * Math.PI) / 180);
  octx.scale(editState.zoom * editState.flipH, editState.zoom * editState.flipV);
  
  const pad = editState.padding / (editState.zoom || 1);
  const dw = Math.max(10, editImg.width - pad * 2);
  const dh = Math.max(10, editImg.height - pad * 2);
  octx.drawImage(editImg, -dw / 2, -dh / 2, dw, dh);
  octx.restore();

  const saveBtn = document.getElementById('modal-save-btn');
  saveBtn.disabled = true;
  saveBtn.textContent = '⏳ Mentés folyamatban...';

  outCanvas.toBlob(async blob => {
    if (!blob) { alert('Hiba a kép exportálásakor'); saveBtn.disabled = false; return; }
    try {
      const bytes = new Uint8Array(await blob.arrayBuffer());
      await sendLogoBinary(currentEditTarget, bytes);
      closeEditor();
    } catch (e) {
      alert('Hiba történt a mentés során.');
    }
    saveBtn.disabled = false;
    saveBtn.textContent = '💾 Szerkesztett logó mentése';
  }, 'image/png');
}

async function uploadPartner() {
  const name = document.getElementById('partner-name').value.trim();
  const file = document.getElementById('file-partner').files[0];
  const msg = document.getElementById('msg-partner');
  const pathOut = document.getElementById('path-partner');
  const btn = document.getElementById('btn-partner');
  pathOut.textContent = '';
  if (!name) { msg.textContent = '❌ Adj meg egy fájlnevet.'; msg.className = 'msg err'; return; }
  if (!file) { msg.textContent = '❌ Válassz PNG fájlt.'; msg.className = 'msg err'; return; }
  if (file.type !== 'image/png') { msg.textContent = '❌ Csak PNG tölthető fel.'; msg.className = 'msg err'; return; }
  btn.disabled = true;
  try {
    const bytes = new Uint8Array(await file.arrayBuffer());
    const res = await fetch('/partner-logo?name=' + encodeURIComponent(name), {
      method: 'POST',
      headers: { 'Content-Type': 'image/png', 'X-CSRF-Token': CSRF_TOKEN },
      body: bytes
    });
    if (res.status === 401) { location.href = '/login'; return; }
    const json = await res.json();
    if (json.ok) {
      msg.textContent = '✅ Feltöltve.';
      msg.className = 'msg ok';
      pathOut.textContent = 'Elérési út: ' + json.path;
    } else {
      msg.textContent = '❌ ' + json.error;
      msg.className = 'msg err';
    }
  } catch (e) {
    msg.textContent = '❌ Hálózati hiba';
    msg.className = 'msg err';
  }
  btn.disabled = false;
}