import { readFileSync } from "node:fs";

const source = readFileSync(new URL("../src/components/FileDropZone.tsx", import.meta.url), "utf8");
const normalized = source.replace(/\s+/g, " ");

function assertIncludes(fragment, message) {
  if (!normalized.includes(fragment.replace(/\s+/g, " "))) throw new Error(message);
}

assertIncludes(
  "function prepareFileDrag(event: ReactDragEvent<HTMLDivElement>) { event.preventDefault(); event.stopPropagation();",
  "drag enter/over must prevent the browser default and stop propagation"
);
assertIncludes("onDragEnter={prepareFileDrag}", "drag enter must use the guarded file-drag handler");
assertIncludes("onDragOver={prepareFileDrag}", "drag over must use the guarded file-drag handler");
assertIncludes(
  "onDragLeave={(event) => { event.preventDefault(); event.stopPropagation();",
  "drag leave must prevent the browser default and stop propagation"
);
assertIncludes(
  "onDrop={(event) => { event.preventDefault(); event.stopPropagation(); setDragActive(false);",
  "drop must prevent the browser default and stop propagation before resolving files"
);
assertIncludes(
  "if (interactionDisabled) { onRejectedDrop?.(\"disabled\"); return; }",
  "disabled drops must route the disabled rejection reason"
);
assertIncludes(
  "void resolveDroppedFiles(event.dataTransfer).then((files) => {",
  "drop must route the event DataTransfer through the shared resolver"
);
assertIncludes(
  "if (files.length === 0) { onRejectedDrop?.(\"empty\"); return; } void handleFiles(files);",
  "resolved files and empty drops must be routed through their explicit callbacks"
);
assertIncludes(
  ".catch(() => onRejectedDrop?.(\"unreadable\"))",
  "resolver failures must route the unreadable rejection reason"
);

console.log("FileDropZone event and result routing structure is intact.");