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";
import { renderHtmlFor } from "./helpers";

const WS = process.env.E2E_WORKSPACE!;
const settle = () => new Promise((r) => setTimeout(r, 300));

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

// F10 host E2E (no LLM): the rewrite of the obsolete F9 authorship-mode test.
// F9's "authorship" mode / renderAuthorship is gone — the on-state renderReview
// now author-colors Claude's PENDING proposal blocks as cw-ins-claude. This
// suite checks that render BEFORE accepting (the class to check is cw-ins-claude,
// the proposal block, NOT cw-by-claude — the old F9 authorship render) and that
// the attribution data layer survives the accept; it does not exercise the F6
// baseline (see diffView.test.ts / baselineRouter.test.ts for the post-accept
// baseline behavior, INV-7/D21). Owns its own markdown doc. Task 8: the render
// probe is now the pure `renderReview` directly (the webview that used to wrap
// it, `renderHtmlFor`, is gone).
suite("F10 review preview — pending Claude proposal renders cw-ins-claude in the on-state (host E2E, no LLM)", () => {
  const DOC_REL = "docs/f10claude.md";
  const TARGET = "The sentence Claude will compose over.";
  const REPLACEMENT = "The sentence CLAUDE COMPOSED via the seam.";

  test("a pending Claude proposal carries cw-ins-claude; accepted proposal leaves attribution data intact", async () => {
    const abs = path.join(WS, DOC_REL);
    fs.mkdirSync(path.dirname(abs), { recursive: true });
    fs.writeFileSync(abs, `# F10\n\n${TARGET}\n`, "utf8");
    const uri = vscode.Uri.file(abs);
    const doc = await vscode.workspace.openTextDocument(uri);
    await vscode.window.showTextDocument(doc);
    // INV-10: entering coediting is required for attribution tracking + F12
    // optimistic-apply to fire — this suite never entered it (pre-migration).
    await vscode.commands.executeCommand("cowriting.coeditDocument");
    await settle();
    const api = await getApi();
    const key = uri.toString();

    // Claude proposes via the seam (F12 optimistic-apply; proposal stays PENDING)
    const start = doc.getText().indexOf(TARGET);
    const id = await vscode.commands.executeCommand<string>("cowriting.proposeAgentEdit", {
      uri: key,
      start,
      end: start + TARGET.length,
      newText: REPLACEMENT,
      model: "sonnet",
      sessionId: "e2e-f10",
      turnId: "turn-f10",
    });
    assert.ok(id, "propose returns an id");
    await settle();

    // PENDING proposal: the preview renders the proposal block with cw-ins-claude.
    // After accepting, the baseline advances (INV-18) → the text becomes "unchanged"
    // and renders plain — so we check BEFORE accepting.
    const pendingHtml = renderHtmlFor(api, doc, key);
    assert.ok(
      pendingHtml.includes("cw-ins-claude"),
      "pending Claude proposal block carries cw-ins-claude in the on-state render",
    );

    // accept via the seam — the proposal lands; the baseline no longer auto-advances
    // (INV-18/#48 retired, spec INV-7), but that isn't asserted here (no coediting
    // entry / baseline established for this doc — only the attribution data layer).
    assert.ok(await api.proposalController.acceptById(DOC_REL, id!), "accept applies via the seam");
    await settle();

    // attribution recorded a Claude (agent) span (data layer intact)
    const claudeSpan = api.attributionController.getSpans(DOC_REL).find((s) => s.authorKind === "agent");
    assert.ok(claudeSpan, "Claude span recorded by F3 (data layer intact after accept)");
    const spans = api.attributionController.spansFor(doc);
    assert.ok(spans.some((s) => s.author === "claude"), "spansFor reports a Claude span for the preview");
  });
});