import { createCanvasSurface } from '../core/canvas_surface.js';

export function drawCachedStaticLayer(targetCtx, shared, layerId, key, x, y, width, height, build) {
  if (!targetCtx || !shared || typeof build !== 'function') return false;
  if (!shared._staticLayers) shared._staticLayers = new Map();
  let layer = shared._staticLayers.get(layerId);
  const w = Math.max(1, Math.ceil(width));
  const h = Math.max(1, Math.ceil(height));
  const needsRebuild = !layer
    || layer.key !== key
    || layer.width !== w
    || layer.height !== h;

  if (needsRebuild) {
    layer = createCanvasSurface(w, h);
    if (!layer) return false;
    layer.key = key;
    layer.ctx.save();
    try {
      layer.ctx.setTransform(1, 0, 0, 1, 0, 0);
      layer.ctx.clearRect(0, 0, w, h);
      build(layer.ctx);
    } finally {
      layer.ctx.restore();
    }
    shared._staticLayers.set(layerId, layer);
  }

  targetCtx.drawImage(layer.canvas, x, y);
  return true;
}