import * as assert from "assert";
import * as fs from "fs";
import * as path from "path";
import * as vscode from "vscode";
import type { CowritingApi } from "../../../src/extension";

const WS = process.env.E2E_WORKSPACE!;
const settle = () => new Promise((r) => setTimeout(r, 400));

async function getApi(): Promise<CowritingApi> {
  const ext = vscode.extensions.getExtension("benstull.vscode-cowriting-plugin")!;
  const api = (await ext.activate()) as CowritingApi;
  assert.ok(api?.trackChangesPreviewController && api?.proposalController, "exports controllers");
  return api;
}

async function freshDoc(rel: string, body: string): Promise<{ doc: vscode.TextDocument; key: string }> {
  const abs = path.join(WS, rel);
  fs.mkdirSync(path.dirname(abs), { recursive: true });
  fs.writeFileSync(abs, body, "utf8");
  const uri = vscode.Uri.file(abs);
  const doc = await vscode.workspace.openTextDocument(uri);
  await vscode.window.showTextDocument(doc);
  await settle();
  return { doc, key: uri.toString() };
}

suite("F12 inline diff — seam landBaseline (#64, INV-48)", () => {
  test("applyAgentEdit with landBaseline:false applies text but does NOT advance the baseline", async () => {
    const { doc, key } = await freshDoc("docs/f12-land.md", "# T\n\nalpha here.\n");
    const api = await getApi();
    await vscode.commands.executeCommand("cowriting.showTrackChangesPreview");
    await settle();
    const before = api.diffViewController.getBaseline(key)?.text ?? doc.getText();
    const start = doc.getText().indexOf("alpha");
    const ok = await api.attributionController.applyAgentEdit(
      doc,
      new vscode.Range(doc.positionAt(start), doc.positionAt(start + "alpha".length)),
      "ALPHA",
      { kind: "agent", id: "claude", agent: { sdk: "x", model: "m", sessionId: "s" } },
      { landBaseline: false },
    );
    await settle();
    assert.ok(ok, "edit applied");
    assert.ok(doc.getText().includes("ALPHA"), "text in buffer");
    assert.strictEqual(api.diffViewController.getBaseline(key)?.text ?? doc.getText(), before, "baseline unchanged");
  });
});