import { readFileSync } from "node:fs";

const page = readFileSync(new URL("../src/features/dataflow/DataflowPage.tsx", import.meta.url), "utf8");
const canvas = readFileSync(new URL("../src/features/dataflow/DataflowCanvas.tsx", import.meta.url), "utf8");
const interactions = readFileSync(new URL("../src/features/dataflow/graphInteractions.ts", import.meta.url), "utf8");
const css = readFileSync(new URL("../src/styles/dataflow.css", import.meta.url), "utf8");
const moduleEntry = readFileSync(new URL("../src/module.ts", import.meta.url), "utf8");

const checks = [
  [page.includes("<DataflowCanvas"), "graph canvas"],
  [page.includes("Apply SQL"), "SQL workbench"],
  [page.includes("<NodeInspector"), "node inspector"],
  [page.includes("previewDataflowPipeline"), "preview action"],
  [
    page.includes('inactiveLabel="Manual"')
      && page.includes('activeLabel="Auto"')
      && page.includes("void runPreview(selectedNodeId, true)"),
    "selection-driven automatic and manual preview modes"
  ],
  [
    !page.includes('aria-label="Preview stage"')
      && page.includes('className="dataflow-preview-stage"'),
    "selected-node preview stage without dropdown"
  ],
  [
    page.includes('resetKey={error} floating')
      && !css.includes(".dataflow-alerts"),
    "central floating dismissible alerts"
  ],
  [
    !css.includes(".dataflow-results-toolbar .segmented-control"),
    "ungapped shared results segmented control"
  ],
  [
    page.includes("response.graph.nodes.some((node) => node.id === selectedNodeId)"),
    "selected node preservation across SQL roundtrips"
  ],
  [page.includes("useUnsavedDraftGuard"), "unsaved-change guard"],
  [canvas.includes("application/x-govoplan-dataflow-node"), "palette drop handling"],
  [canvas.includes("isValidConnection"), "edge validation"],
  [canvas.includes("connectionRadius={32}"), "visible connection drop radius"],
  [canvas.includes("initialWidth: 180"), "known initial node width"],
  [canvas.includes('change.type !== "dimensions"'), "measurement-only change filtering"],
  [canvas.includes("onReconnect={onReconnect}"), "edge reconnection"],
  [canvas.includes("onReconnectEnd="), "edge deletion on dropped reconnection"],
  [canvas.includes("selectedEdgeId"), "persistent edge selection"],
  [
    canvas.includes("newGraphEdgeId()")
      && interactions.includes("return `edge-${crypto.randomUUID()}`"),
    "bounded opaque edge identifiers"
  ],
  [
    canvas.includes("closestProximityConnection")
      && interactions.includes("definitionConnectionError"),
    "validated proximity connection"
  ],
  [css.includes(".dataflow-edge-proximity"), "proximity connection indicator"],
  [
    moduleEntry.indexOf("@xyflow/react/dist/style.css") <
      moduleEntry.indexOf("./styles/dataflow.css"),
    "XyFlow base styles before GovOPlaN overrides"
  ],
  [css.includes("height: calc(100vh - 115px)"), "full-height workspace"],
  [css.includes(".dataflow-preview-table-wrap"), "bounded preview scrolling"],
  [
    /\.dataflow-palette-items\s*\{[^}]*grid-auto-rows:\s*max-content;[^}]*overflow-y:\s*auto;/s.test(css),
    "bounded palette scrolling"
  ],
  [
    /\.dataflow-inspector-fields\s*\{[^}]*grid-auto-rows:\s*max-content;[^}]*overflow-y:\s*auto;/s.test(css),
    "bounded inspector scrolling"
  ]
];

const missing = checks.filter(([present]) => !present).map(([, label]) => label);
if (missing.length) {
  throw new Error(`Dataflow UI structure is missing: ${missing.join(", ")}`);
}

console.log("Dataflow page structure checks passed.");