(() => {
  // Utilities
  const $ = sel => document.querySelector(sel);
  const $$ = sel => Array.from(document.querySelectorAll(sel));
  const clamp = (v,min,max) => Math.max(min, Math.min(max, v));
  const uid = (p='id') => p + '_' + Math.random().toString(36).slice(2,9);
  const isMac = navigator.platform.toUpperCase().indexOf('MAC')>=0;

  const defaultColors = [
    '#e53935', '#f44336', '#ff7043', '#ffb300', '#ffee58', '#9ccc65', '#26a69a',
    '#26c6da', '#42a5f5', '#5c6bc0', '#7e57c2', '#ec407a', '#8d6e63', '#455a64'
  ];

  // Elements
  const canvas = $('#overlayCanvas');
  const ctx = canvas.getContext('2d');
  const wrap = $('#canvasWrap');
  const mapImg = $('#mapImage');
  const colorPaletteEl = $('#colorPalette');
  const colorPicker = $('#colorPicker');
  const sizeSlider = $('#sizeSlider');
  const strokeSlider = $('#strokeSlider');
  const zoomSlider = $('#zoomSlider');
  const fitBtn = $('#fitBtn');
  const resetViewBtn = $('#resetViewBtn');
  const exportBtn = $('#exportBtn');
  const clearAllBtn = $('#clearAllBtn');
  const clearMapBtn = $('#clearMapBtn');
  const pasteBtn = $('#pasteBtn');
  const mapFile = $('#mapFile');
  const iconsFile = $('#iconsFile');
  const textEditor = $('#textEditor');
  const dropZone = $('#dropZone');
  const iconPalette = $('#iconPalette');

  // State
  const state = {
    tool: 'select', // 'select' | 'pan' | 'text' | 'arrow' | 'curve' | 'lasso' | 'placeIcon'
    color: defaultColors[0],
    strokeWidth: 4,
    size: 64,
    zoom: 1,
    tx: 0,
    ty: 0,
    isPanning: false,
    panStart: {x:0,y:0, tx:0,ty:0},
    drawing: null, // current drawing object
    shapes: [],
    selectedId: null,
    map: { img: null, w: 0, h: 0, url: '' },
    icons: [], // {id, src, name, img}
    placeIconId: null,
    dpr: window.devicePixelRatio || 1
  };

  // Build color palette
  function buildPalette(){
    colorPaletteEl.innerHTML = '';
    defaultColors.forEach(c => {
      const sw = document.createElement('button');
      sw.className = 'swatch';
      sw.style.background = c;
      sw.title = c;
      if(c.toLowerCase() === state.color.toLowerCase()) sw.classList.add('active');
      sw.addEventListener('click', () => {
        state.color = c;
        colorPicker.value = toHex(c);
        $$('.swatch').forEach(el=>el.classList.remove('active'));
        sw.classList.add('active');
      });
      colorPaletteEl.appendChild(sw);
    });
  }
  function toHex(c){
    // Accept rgb(...) or hex; return hex
    if(c.startsWith('#')) return c;
    const m = c.match(/rgba?\((\d+),\s*(\d+),\s*(\d+)/i);
    if(!m) return '#000000';
    const r = (+m[1]).toString(16).padStart(2,'0');
    const g = (+m[2]).toString(16).padStart(2,'0');
    const b = (+m[3]).toString(16).padStart(2,'0');
    return `#${r}${g}${b}`;
  }

  // Canvas sizing
  function resizeCanvas(){
    const rect = wrap.getBoundingClientRect();
    const dpr = state.dpr = window.devicePixelRatio || 1;
    canvas.width = Math.max(1, Math.floor(rect.width * dpr));
    canvas.height = Math.max(1, Math.floor(rect.height * dpr));
    canvas.style.width = rect.width + 'px';
    canvas.style.height = rect.height + 'px';
    render();
  }
  window.addEventListener('resize', resizeCanvas);

  // Coordinate transforms
  function worldToScreen(pt){
    return {
      x: (pt.x * state.zoom) + state.tx,
      y: (pt.y * state.zoom) + state.ty
    };
  }
  function screenToWorld(pt){
    return {
      x: (pt.x - state.tx) / state.zoom,
      y: (pt.y - state.ty) / state.zoom
    };
  }

  // Map loading
  async function setMapFromFile(file){
    if(!file) return;
    const url = URL.createObjectURL(file);
    await setMapFromURL(url, true);
  }
  async function setMapFromURL(url, revokeLater=false){
    const img = new Image();
    img.decoding = 'async';
    img.onload = () => {
      state.map = { img: img, w: img.naturalWidth, h: img.naturalHeight, url };
      mapImg.src = url;
      mapImg.style.width = 'auto';
      mapImg.style.height = 'auto';
      fitToScreen();
      render();
    };
    img.onerror = () => {
      alert('Не удалось загрузить изображение.');
      if(revokeLater) URL.revokeObjectURL(url);
    };
    img.src = url;
  }

  // Fit/Reset view
  function fitToScreen(){
    const rect = wrap.getBoundingClientRect();
    if(!state.map.img){
      state.zoom = 1; state.tx = rect.width/2; state.ty = rect.height/2;
      zoomSlider.value = Math.round(state.zoom*100);
      return;
    }
    const mw = state.map.w, mh = state.map.h;
    const sx = rect.width / mw;
    const sy = rect.height / mh;
    const scale = Math.min(sx, sy) * 0.98; // margin
    state.zoom = clamp(scale, 0.05, 8);
    state.tx = (rect.width - mw * state.zoom) / 2;
    state.ty = (rect.height - mh * state.zoom) / 2;
    zoomSlider.value = Math.round(state.zoom*100);
    render();
  }
  function resetView(){
    state.tx = 0; state.ty = 0; state.zoom = 1;
    zoomSlider.value = 100;
    render();
  }

  // Icons
  function addIcons(files){
    const tasks = [];
    for(const file of files){
      if(!file.type.startsWith('image/')) continue;
      const url = URL.createObjectURL(file);
      const id = uid('icon');
      const img = new Image();
      img.decoding = 'async';
      img.src = url;
      tasks.push(new Promise(res => {
        img.onload = () => {
          const icon = { id, src: url, name: file.name.replace(/\.[^.]+$/,''), img };
          state.icons.push(icon);
          renderIconPalette();
          res();
        };
        img.onerror = () => res();
      }));
    }
    Promise.all(tasks);
  }
  function renderIconPalette(){
    iconPalette.innerHTML = '';
    state.icons.forEach(icon => {
      const item = document.createElement('div');
      item.className = 'icon-item';
      item.draggable = true;
      item.dataset.iconId = icon.id;

      const imgEl = document.createElement('img');
      imgEl.src = icon.src;
      imgEl.alt = icon.name;
      item.appendChild(imgEl);

      const nameInput = document.createElement('input');
      nameInput.className = 'name';
      nameInput.value = icon.name;
      nameInput.title = 'Название';
      nameInput.addEventListener('change', () => { icon.name = nameInput.value; });
      item.appendChild(nameInput);

      // Place mode on click
      item.addEventListener('click', (e) => {
        if(state.placeIconId === icon.id){
          state.placeIconId = null;
          setTool('select');
        } else {
          state.placeIconId = icon.id;
          setTool('placeIcon');
        }
      });

      // Drag&Drop to canvas
      item.addEventListener('dragstart', (e) => {
        e.dataTransfer.setData('text/plain', icon.id);
        e.dataTransfer.effectAllowed = 'copy';
      });

      iconPalette.appendChild(item);
    });
  }

  // Shapes API
  function addShape(shape){
    state.shapes.push(shape);
    state.selectedId = shape.id;
    render();
  }
  function removeSelected(){
    if(!state.selectedId) return;
    const idx = state.shapes.findIndex(s => s.id === state.selectedId);
    if(idx >= 0){
      state.shapes.splice(idx,1);
      state.selectedId = null;
      render();
    }
  }

  // Hit tests
  function hitTest(ptWorld){
    // Return topmost shape id near the point (tolerance in world units)
    const tol = 8 / state.zoom; // 8px tolerance in screen -> world
    for(let i = state.shapes.length - 1; i >= 0; i--){
      const s = state.shapes[i];
      switch(s.type){
        case 'text': {
          const w = measureTextWidth(s) + 12;
          const h = s.fontSize * 1.6;
          if(ptWorld.x >= s.x && ptWorld.x <= s.x + w &&
             ptWorld.y >= s.y - h && ptWorld.y <= s.y){
            return s.id;
          }
          break;
        }
        case 'icon': {
          const w = s.size, h = s.size;
          if(ptWorld.x >= s.x && ptWorld.x <= s.x + w &&
             ptWorld.y >= s.y && ptWorld.y <= s.y + h){
            return s.id;
          }
          break;
        }
        case 'arrow': {
          const d = pointLineDistance(ptWorld, s.start, s.end);
          if(d <= tol) return s.id;
          break;
        }
        case 'curve': {
          if(pointNearCubic(ptWorld, s.start, s.cp1, s.cp2, s.end, tol)) return s.id;
          break;
        }
        case 'lasso': {
          if(pointNearPolyline(ptWorld, s.points, tol)) return s.id;
          break;
        }
      }
    }
    return null;
  }

  function pointLineDistance(p, a, b){
    const A = p.x - a.x, B = p.y - a.y, C = b.x - a.x, D = b.y - a.y;
    const dot = A*C + B*D;
    const len_sq = C*C + D*D;
    let t = len_sq ? dot / len_sq : -1;
    t = Math.max(0, Math.min(1, t));
    const xx = a.x + C*t, yy = a.y + D*t;
    const dx = p.x - xx, dy = p.y - yy;
    return Math.hypot(dx, dy);
  }
  function pointNearCubic(p, p0, p1, p2, p3, tol){
    // sample
    const steps = 32;
    let prev = p0;
    for(let i=1;i<=steps;i++){
      const t = i/steps;
      const c = cubic(p0, p1, p2, p3, t);
      const d = pointLineDistance(p, prev, c);
      if(d <= tol) return true;
      prev = c;
    }
    return false;
  }
  function pointNearPolyline(p, pts, tol){
    if(pts.length < 2) return false;
    for(let i=1;i<pts.length;i++){
      if(pointLineDistance(p, pts[i-1], pts[i]) <= tol) return true;
    }
    return false;
  }
  function cubic(p0,p1,p2,p3,t){
    const u = 1 - t;
    const tt = t*t, uu = u*u, uuu = uu*u, ttt = tt*t;
    return {
      x: uuu*p0.x + 3*uu*t*p1.x + 3*u*tt*p2.x + ttt*p3.x,
      y: uuu*p0.y + 3*uu*t*p1.y + 3*u*tt*p2.y + ttt*p3.y
    };
  }

  // Text measurement (approx)
  function measureTextWidth(s){
    // approximate width ~ 0.6 * fontSize * chars
    const len = (s.text || '').length;
    return Math.max(10, 0.6 * s.fontSize * len);
  }

  // Rendering
  function render(){
    const rect = wrap.getBoundingClientRect();
    const dpr = state.dpr;
    ctx.setTransform(dpr,0,0,dpr,0,0);
    ctx.clearRect(0,0,rect.width,rect.height);

    // Draw white sheet (paper)
    ctx.fillStyle = '#fff';
    ctx.fillRect(0,0,rect.width,rect.height);

    // Apply pan/zoom
    ctx.save();
    ctx.translate(state.tx, state.ty);
    ctx.scale(state.zoom, state.zoom);

    // Draw grid for world (optional subtle)
    drawGrid();

    // Draw map image if any
    if(state.map.img){
      // already on <img>, but for export we need content only. Here we do not draw it on canvas intentionally.
      // Users expect "white page" with only overlays. If you want to draw the map to canvas as well, uncomment below:
      // ctx.drawImage(state.map.img, 0, 0, state.map.w, state.map.h);
    }

    // Draw shapes
    for(const s of state.shapes){
      drawShape(s);
    }

    // Draw selection
    if(state.selectedId){
      drawSelection(state.selectedId);
    }

    ctx.restore();
  }

  function drawGrid(){
    const step = 64; // world units
    const w = state.map.w || 4096;
    const h = state.map.h || 4096;
    const maxX = Math.ceil((w + Math.abs(state.tx)) / state.zoom) + step;
    const maxY = Math.ceil((h + Math.abs(state.ty)) / state.zoom) + step;
    const minX = -step;
    const minY = -step;

    ctx.save();
    ctx.lineWidth = 1 / state.zoom;
    ctx.strokeStyle = 'rgba(0,0,0,0.06)';

    // Vertical lines
    const xStart = Math.floor(minX / step) * step;
    for(let x = xStart; x <= maxX; x += step){
      ctx.beginPath();
      ctx.moveTo(x, minY);
      ctx.lineTo(x, maxY);
      ctx.stroke();
    }
    // Horizontal lines
    const yStart = Math.floor(minY / step) * step;
    for(let y = yStart; y <= maxY; y += step){
      ctx.beginPath();
      ctx.moveTo(minX, y);
      ctx.lineTo(maxX, y);
      ctx.stroke();
    }
    ctx.restore();
  }

  function drawShape(s){
    switch(s.type){
      case 'text': {
        ctx.save();
        ctx.fillStyle = s.color || '#111';
        ctx.font = `${s.fontSize || 32}px system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Arial`;
        ctx.textBaseline = 'top';
        ctx.fillText(s.text || '', s.x, s.y);
        ctx.restore();
        break;
      }
      case 'icon': {
        if(s.icon && s.icon.img){
          ctx.drawImage(s.icon.img, s.x, s.y, s.size, s.size);
        } else {
          ctx.save();
          ctx.fillStyle = '#ddd';
          ctx.fillRect(s.x, s.y, s.size, s.size);
          ctx.restore();
        }
        break;
      }
      case 'arrow': {
        ctx.save();
        ctx.strokeStyle = s.color || '#e53935';
        ctx.lineWidth = (s.strokeWidth || 4) / state.zoom;
        ctx.lineCap = 'round';
        ctx.beginPath();
        ctx.moveTo(s.start.x, s.start.y);
        ctx.lineTo(s.end.x, s.end.y);
        ctx.stroke();
        drawArrowHead(s.end, s.start, s.color || '#e53935', s.strokeWidth || 4);
        ctx.restore();
        break;
      }
      case 'curve': {
        ctx.save();
        ctx.strokeStyle = s.color || '#1e88e5';
        ctx.lineWidth = (s.strokeWidth || 4) / state.zoom;
        ctx.lineCap = 'round';
        ctx.beginPath();
        ctx.moveTo(s.start.x, s.start.y);
        ctx.bezierCurveTo(s.cp1.x, s.cp1.y, s.cp2.x, s.cp2.y, s.end.x, s.end.y);
        ctx.stroke();
        drawArrowHead(s.end, s.cp2, s.color || '#1e88e5', s.strokeWidth || 4);
        ctx.restore();
        break;
      }
      case 'lasso': {
        ctx.save();
        ctx.strokeStyle = s.color || '#7e57c2';
        ctx.lineWidth = (s.strokeWidth || 4) / state.zoom;
        ctx.lineCap = 'round';
        ctx.beginPath();
        for(let i=0;i<s.points.length;i++){
          const p = s.points[i];
          if(i===0) ctx.moveTo(p.x, p.y);
          else ctx.lineTo(p.x, p.y);
        }
        ctx.stroke();
        ctx.restore();
        break;
      }
    }
  }

  function drawArrowHead(to, from, color, strokeWidth){
    const headLen = Math.max(6, 6 + strokeWidth);
    const angle = Math.atan2(to.y - from.y, to.x - from.x);
    ctx.save();
    ctx.fillStyle = color;
    ctx.beginPath();
    ctx.moveTo(to.x, to.y);
    ctx.lineTo(to.x - headLen * Math.cos(angle - Math.PI/6),
               to.y - headLen * Math.sin(angle - Math.PI/6));
    ctx.lineTo(to.x - headLen * Math.cos(angle + Math.PI/6),
               to.y - headLen * Math.sin(angle + Math.PI/6));
    ctx.closePath();
    ctx.fill();
    ctx.restore();
  }

  function drawSelection(id){
    const s = state.shapes.find(x => x.id === id);
    if(!s) return;
    ctx.save();
    ctx.strokeStyle = '#4f46e5';
    ctx.lineWidth = 1 / state.zoom;
    let rect;
    switch(s.type){
      case 'text': {
        const w = measureTextWidth(s) + 12, h = s.fontSize * 1.6;
        rect = {x: s.x-6, y: s.y-6, w, h};
        break;
      }
      case 'icon': rect = {x: s.x, y: s.y, w: s.size, h: s.size}; break;
      case 'arrow': {
        const minx = Math.min(s.start.x, s.end.x);
        const miny = Math.min(s.start.y, s.end.y);
        const maxx = Math.max(s.start.x, s.end.x);
        const maxy = Math.max(s.start.y, s.end.y);
        rect = {x: minx, y: miny, w: (maxx-minx), h: (maxy-miny)};
        break;
      }
      case 'curve': {
        // bounding box of cubic
        const pts = sampleCubic(s.start, s.cp1, s.cp2, s.end, 24);
        const xs = pts.map(p=>p.x), ys = pts.map(p=>p.y);
        const minx = Math.min(...xs), miny = Math.min(...ys);
        const maxx = Math.max(...xs), maxy = Math.max(...ys);
        rect = {x: minx, y: miny, w: maxx-minx, h: maxy-miny};
        break;
      }
      case 'lasso': {
        const xs = s.points.map(p=>p.x), ys = s.points.map(p=>p.y);
        const minx = Math.min(...xs), miny = Math.min(...ys);
        const maxx = Math.max(...xs), maxy = Math.max(...ys);
        rect = {x: minx, y: miny, w: maxx-minx, h: maxy-miny};
        break;
      }
    }
    if(rect){
      ctx.setLineDash([4 / state.zoom, 4 / state.zoom]);
      ctx.strokeRect(rect.x, rect.y, rect.w, rect.h);
      ctx.setLineDash([]);
    }
    ctx.restore();
  }

  function sampleCubic(p0,p1,p2,p3,steps){
    const pts = [];
    for(let i=0;i<=steps;i++){
      const t = i/steps;
      pts.push(cubic(p0,p1,p2,p3,t));
    }
    return pts;
  }

  // Interaction
  function setTool(tool){
    state.tool = tool;
    $$('.tool-btn').forEach(b => b.classList.toggle('active', b.dataset.tool === tool));
    wrap.classList.toggle('pan-mode', tool === 'pan');
  }
  $$('.tool-btn').forEach(btn => btn.addEventListener('click', () => setTool(btn.dataset.tool)));
  // default tool
  setTool('select');

  // Events
  canvas.addEventListener('pointerdown', (e) => {
    canvas.setPointerCapture(e.pointerId);
    const p = getPointer(e);
    const world = screenToWorld(p);

    if(state.tool === 'pan' || e.button === 1 || (e.button === 0 && e.altKey)){
      state.isPanning = true;
      state.panStart = {x: e.clientX, y: e.clientY, tx: state.tx, ty: state.ty};
      return;
    }

    switch(state.tool){
      case 'select': {
        const id = hitTest(world);
        if(id){
          state.selectedId = id;
          state.dragging = { id, start: world, orig: cloneShapePos(id) };
        } else {
          state.selectedId = null;
        }
        render();
        break;
      }
      case 'text': {
        showTextEditor(world);
        break;
      }
      case 'placeIcon': {
        if(state.placeIconId){
          const icon = state.icons.find(i => i.id === state.placeIconId);
          if(icon){
            addShape({
              type: 'icon',
              id: uid('iconObj'),
              x: world.x, y: world.y,
              size: state.size,
              color: state.color,
              icon: icon
            });
          }
        }
        break;
      }
      case 'arrow': {
        state.drawing = { type: 'arrow', id: uid('arrow'), color: state.color, strokeWidth: state.strokeWidth, start: world, end: world };
        addShape(state.drawing);
        break;
      }
      case 'curve': {
        state.drawing = { type: 'curve', id: uid('curve'), color: state.color, strokeWidth: state.strokeWidth, start: world, cp1: world, cp2: world, end: world };
        addShape(state.drawing);
        break;
      }
      case 'lasso': {
        state.drawing = { type: 'lasso', id: uid('lasso'), color: state.color, strokeWidth: state.strokeWidth, points: [world] };
        addShape(state.drawing);
        break;
      }
    }
  });

  canvas.addEventListener('pointermove', (e) => {
    const p = getPointer(e);
    const world = screenToWorld(p);

    if(state.isPanning){
      const dx = e.clientX - state.panStart.x;
      const dy = e.clientY - state.panStart.y;
      state.tx = state.panStart.tx + dx;
      state.ty = state.panStart.ty + dy;
      render();
      return;
    }

    if(state.dragging){
      const s = state.shapes.find(x => x.id === state.dragging.id);
      if(s){
        const dx = world.x - state.dragging.start.x;
        const dy = world.y - state.dragging.start.y;
        moveShape(s, dx, dy);
        render();
      }
      return;
    }

    if(state.drawing){
      if(state.drawing.type === 'arrow'){
        state.drawing.end = world;
      } else if(state.drawing.type === 'curve'){
        // second control and end follow pointer for preview; end finalize on up
        state.drawing.cp2 = { x: (state.drawing.start.x + world.x)/2, y: state.drawing.start.y };
        state.drawing.end = world;
      } else if(state.drawing.type === 'lasso'){
        const pts = state.drawing.points;
        const last = pts[pts.length-1];
        // add point if moved enough
        const dist = Math.hypot(world.x - last.x, world.y - last.y);
        if(dist > 2/state.zoom) pts.push(world);
      }
      render();
      return;
    }
  });

  canvas.addEventListener('pointerup', (e) => {
    canvas.releasePointerCapture(e.pointerId);
    state.isPanning = false;
    state.dragging = null;
    if(state.drawing){
      // finalize
      if(state.drawing.type === 'lasso'){
        if(state.drawing.points.length < 2){
          // too short, remove
          state.shapes = state.shapes.filter(s => s.id !== state.drawing.id);
        }
      }
      if(state.drawing.type === 'curve'){
        // set cp1 mirrored to end for nice S-curve
        const d = { x: state.drawing.end.x - state.drawing.start.x, y: state.drawing.end.y - state.drawing.start.y };
        state.drawing.cp1 = { x: state.drawing.start.x + d.x/3, y: state.drawing.start.y + d.y/3 };
      }
      state.drawing = null;
      render();
    }
  });

  canvas.addEventListener('dblclick', (e) => {
    if(state.tool === 'select'){
      const p = getPointer(e);
      const w = screenToWorld(p);
      const id = hitTest(w);
      if(id){
        const s = state.shapes.find(x => x.id === id);
        if(s){
          if(s.type === 'text'){
            showTextEditor({x: s.x, y: s.y}, s);
          } else if(s.type === 'icon'){
            // edit size quick
            const nv = prompt('Размер иконки (px):', s.size);
            if(nv){ s.size = clamp(parseInt(nv)||s.size, 8, 1024); render(); }
          }
        }
      }
    }
  });

  // Prevent context menu to allow right-drag pan
  canvas.addEventListener('contextmenu', (e) => e.preventDefault());

  function getPointer(e){
    const rect = canvas.getBoundingClientRect();
    return { x: e.clientX - rect.left, y: e.clientY - rect.top };
  }

  function moveShape(s, dx, dy){
    switch(s.type){
      case 'text': s.x += dx; s.y += dy; break;
      case 'icon': s.x += dx; s.y += dy; break;
      case 'arrow': s.start.x += dx; s.start.y += dy; s.end.x += dx; s.end.y += dy; break;
      case 'curve': s.start.x += dx; s.start.y += dy; s.cp1.x += dx; s.cp1.y += dy; s.cp2.x += dx; s.cp2.y += dy; s.end.x += dx; s.end.y += dy; break;
      case 'lasso': s.points = s.points.map(p => ({x:p.x+dx, y:p.y+dy})); break;
    }
  }
  function cloneShapePos(id){
    const s = state.shapes.find(x => x.id === id);
    if(!s) return null;
    return JSON.parse(JSON.stringify(s));
  }

  // Text editor
  function showTextEditor(world, existing=null){
    const scr = worldToScreen(world);
    textEditor.style.left = (scr.x) + 'px';
    textEditor.style.top = (scr.y) + 'px';
    textEditor.style.color = state.color;
    textEditor.value = existing?.text || '';
    textEditor.dataset.editId = existing?.id || '';
    textEditor.style.display = 'block';
    textEditor.focus();
    textEditor.onkeydown = (e) => {
      if(e.key === 'Enter' && (e.ctrlKey || e.metaKey || !e.shiftKey)){
        e.preventDefault();
        commitTextEditor();
      } else if(e.key === 'Escape'){
        e.preventDefault();
        hideTextEditor();
      }
    };
    textEditor.onblur = () => {
      // Commit on blur
      if(textEditor.style.display !== 'none') commitTextEditor();
    };
  }
  function commitTextEditor(){
    const txt = textEditor.value.trim();
    const editId = textEditor.dataset.editId || '';
    hideTextEditor();
    if(!txt) return;
    if(editId){
      const s = state.shapes.find(x => x.id === editId);
      if(s && s.type === 'text'){ s.text = txt; s.color = state.color; s.fontSize = Math.max(10, parseInt(sizeSlider.value)||32); render(); }
    } else {
      // get position back from screen position (we used worldToScreen earlier; store world before hide)
      // We'll reconstruct using inverse transform of saved screen coords
      // Better: keep last world position by reading style left/top, convert to world:
      const left = parseFloat(textEditor.style.left), top = parseFloat(textEditor.style.top);
      const world = screenToWorld({x: left, y: top});
      addShape({
        type: 'text', id: uid('text'), x: world.x, y: world.y,
        text: txt, color: state.color, fontSize: Math.max(10, parseInt(sizeSlider.value)||32)
      });
    }
  }
  function hideTextEditor(){
    textEditor.style.display = 'none';
    textEditor.onblur = null;
    textEditor.onkeydown = null;
    textEditor.dataset.editId = '';
  }

  // Controls
  colorPicker.addEventListener('input', () => {
    state.color = colorPicker.value;
    $$('.swatch').forEach(el=>el.classList.remove('active'));
  });
  sizeSlider.addEventListener('input', () => { state.size = parseInt(sizeSlider.value)||64; if(state.selectedId){ const s = state.shapes.find(x=>x.id===state.selectedId); if(s?.type==='icon'){ s.size = state.size; render(); } }});
  strokeSlider.addEventListener('input', () => { state.strokeWidth = parseInt(strokeSlider.value)||4; });
  zoomSlider.addEventListener('input', () => {
    const val = parseInt(zoomSlider.value)/100;
    const rect = wrap.getBoundingClientRect();
    // Zoom around center
    const cx = rect.width/2, cy = rect.height/2;
    const wx = (cx - state.tx)/state.zoom, wy = (cy - state.ty)/state.zoom;
    state.zoom = clamp(val, 0.05, 8);
    state.tx = cx - wx*state.zoom;
    state.ty = cy - wy*state.zoom;
    render();
  });
  fitBtn.addEventListener('click', fitToScreen);
  resetViewBtn.addEventListener('click', resetView);

  exportBtn.addEventListener('click', exportPNG);
  clearAllBtn.addEventListener('click', () => {
    if(confirm('Удалить все объекты?')){ state.shapes = []; state.selectedId = null; render(); }
  });
  clearMapBtn.addEventListener('click', () => {
    if(confirm('Удалить карту?')){
      state.map = { img: null, w: 0, h: 0, url: '' };
      mapImg.src = '';
      render();
    }
  });

  pasteBtn.addEventListener('click', async () => {
    try{
      const items = await navigator.clipboard.read();
      for(const item of items){
        for(const type of item.types){
          if(type.startsWith('image/')){
            const blob = await item.getType(type);
            await setMapFromFile(new File([blob], 'pasted.png', {type: blob.type}));
            return;
          }
        }
      }
      alert('В буфере нет изображения.');
    }catch(err){
      alert('Не удалось получить доступ к буферу обмена. Попробуйте Ctrl/Cmd+V или разрешите доступ.');
    }
  });

  // File inputs
  mapFile.addEventListener('change', async (e) => {
    const file = e.target.files[0];
    if(file) await setMapFromFile(file);
    mapFile.value = '';
  });
  iconsFile.addEventListener('change', (e) => {
    if(e.target.files?.length) addIcons(e.target.files);
    iconsFile.value = '';
  });

  // Drag&Drop on wrapper (map or icons)
  ;['dragenter','dragover'].forEach(evt => {
    wrap.addEventListener(evt, (e) => {
      e.preventDefault(); e.stopPropagation();
      dropZone.style.display = 'flex';
    });
  });
  ;['dragleave','drop'].forEach(evt => {
    wrap.addEventListener(evt, (e) => {
      e.preventDefault(); e.stopPropagation();
      dropZone.style.display = 'none';
    });
  });
  wrap.addEventListener('drop', async (e) => {
    const dt = e.dataTransfer;
    const iconId = dt.getData('text/plain');
    if(iconId){
      // Place icon at drop position
      const icon = state.icons.find(i => i.id === iconId);
      if(icon){
        const rect = wrap.getBoundingClientRect();
        const p = { x: e.clientX - rect.left, y: e.clientY - rect.top };
        const w = screenToWorld(p);
        addShape({
          type: 'icon', id: uid('iconObj'),
          x: w.x, y: w.y, size: state.size, color: state.color, icon
        });
      }
      return;
    }
    const file = dt.files && dt.files[0];
    if(file && file.type.startsWith('image/')){
      await setMapFromFile(file);
    }
  });

  // Clipboard paste (image -> map)
  document.addEventListener('paste', async (e) => {
    const items = e.clipboardData?.items || [];
    for(const it of items){
      if(it.type && it.type.startsWith('image/')){
        const blob = it.getAsFile();
        if(blob){
          await setMapFromFile(new File([blob], 'pasted.png', {type: blob.type}));
          break;
        }
      }
    }
  });

  // Keyboard
  document.addEventListener('keydown', (e) => {
    if(e.key.toLowerCase() === 'v'){ setTool('select'); }
    if(e.key.toLowerCase() === 'h' || e.key.toLowerCase() === 'p'){ setTool('pan'); }
    if(e.key.toLowerCase() === 'a'){ setTool('arrow'); }
    if(e.key.toLowerCase() === 'c'){ setTool('curve'); }
    if(e.key.toLowerCase() === 'l'){ setTool('lasso'); }
    if(e.key.toLowerCase() === 't'){ setTool('text'); }

    if((e.key === 'Delete' || e.key === 'Backspace') && !isInputFocused()){
      removeSelected();
    }
    if((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 's'){
      e.preventDefault();
      exportPNG();
    }
    if((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 'z'){
      if(e.shiftKey){ /* redo - not implemented */ }
      else {
        // undo last shape
        if(state.shapes.length){
          state.shapes.pop(); state.selectedId = null; render();
        }
      }
    }
  });
  function isInputFocused(){
    const a = document.activeElement;
    return a && (a.tagName === 'INPUT' || a.tagName === 'TEXTAREA' || a.isContentEditable);
  }

  // Export: render map + overlays to a new canvas (white sheet)
  function exportPNG(){
    if(!state.map.img){
      alert('Сначала загрузите карту (или изображение).');
      return;
    }
    const mw = state.map.w, mh = state.map.h;
    const scale = state.zoom;
    const dpr = 2; // high quality
    const out = document.createElement('canvas');
    out.width = Math.round(mw * scale * dpr);
    out.height = Math.round(mh * scale * dpr);
    const c = out.getContext('2d');
    c.scale(dpr, dpr);

    // White sheet
    c.fillStyle = '#ffffff';
    c.fillRect(0,0, mw*scale, mh*scale);

    // Optional: draw map image to export too. If you want it, uncomment next line:
    // c.drawImage(state.map.img, 0, 0, mw*scale, mh*scale);

    // Apply pan/zoom transform
    c.translate(state.tx, state.ty);
    c.scale(scale, scale);

    // Draw shapes
    for(const s of state.shapes){
      drawShapeExport(c, s, scale);
    }

    out.toBlob((blob) => {
      const url = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = 'map-export.png';
      a.click();
      setTimeout(() => URL.revokeObjectURL(url), 1500);
    }, 'image/png');
  }

  function drawShapeExport(c, s, scale){
    // same as drawShape but without selection; strokeWidth already in world units; when we scaled context by 'scale', no need to divide
    switch(s.type){
      case 'text': {
        c.save();
        c.fillStyle = s.color || '#111';
        c.font = `${s.fontSize || 32}px system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Arial`;
        c.textBaseline = 'top';
        c.fillText(s.text || '', s.x, s.y);
        c.restore();
        break;
      }
      case 'icon': {
        if(s.icon && s.icon.img) c.drawImage(s.icon.img, s.x, s.y, s.size, s.size);
        break;
      }
      case 'arrow': {
        c.save();
        c.strokeStyle = s.color || '#e53935';
        c.lineWidth = (s.strokeWidth || 4);
        c.lineCap = 'round';
        c.beginPath();
        c.moveTo(s.start.x, s.start.y);
        c.lineTo(s.end.x, s.end.y);
        c.stroke();
        drawArrowHeadExport(c, s.end, s.start, s.color || '#e53935', s.strokeWidth || 4);
        c.restore();
        break;
      }
      case 'curve': {
        c.save();
        c.strokeStyle = s.color || '#1e88e5';
        c.lineWidth = (s.strokeWidth || 4);
        c.lineCap = 'round';
        c.beginPath();
        c.moveTo(s.start.x, s.start.y);
        c.bezierCurveTo(s.cp1.x, s.cp1.y, s.cp2.x, s.cp2.y, s.end.x, s.end.y);
        c.stroke();
        drawArrowHeadExport(c, s.end, s.cp2, s.color || '#1e88e5', s.strokeWidth || 4);
        c.restore();
        break;
      }
      case 'lasso': {
        c.save();
        c.strokeStyle = s.color || '#7e57c2';
        c.lineWidth = (s.strokeWidth || 4);
        c.lineCap = 'round';
        c.beginPath();
        for(let i=0;i<s.points.length;i++){
          const p = s.points[i];
          if(i===0) c.moveTo(p.x, p.y);
          else c.lineTo(p.x, p.y);
        }
        c.stroke();
        c.restore();
        break;
      }
    }
  }
  function drawArrowHeadExport(c, to, from, color, strokeWidth){
    const headLen = Math.max(6, 6 + strokeWidth);
    const angle = Math.atan2(to.y - from.y, to.x - from.x);
    c.save();
    c.fillStyle = color;
    c.beginPath();
    c.moveTo(to.x, to.y);
    c.lineTo(to.x - headLen * Math.cos(angle - Math.PI/6),
               to.y - headLen * Math.sin(angle - Math.PI/6));
    c.lineTo(to.x - headLen * Math.cos(angle + Math.PI/6),
               to.y - headLen * Math.sin(angle + Math.PI/6));
    c.closePath();
    c.fill();
    c.restore();
  }

  // Initialization
  buildPalette();
  resizeCanvas();
  render();

})();