import * as assert from "assert";
import * as fs from "fs";
import * as os from "os";
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, 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?.proposalController && api?.sidecarRouter, "extension exports the authoring API + router");
  return api;
}
async function proposeViaCommand(uri: string, text: string, target: string, newText: string, turnId: string): Promise<string> {
  const start = text.indexOf(target);
  assert.ok(start >= 0, `text contains "${target}"`);
  const id = await vscode.commands.executeCommand<string>("cowriting.proposeAgentEdit", {
    uri, start, end: start + target.length, newText, model: "sonnet", sessionId: "e2e-oow", turnId,
  });
  assert.ok(id, "propose returns the proposal id");
  return id!;
}

// F8 host E2E (no LLM): authoring on a file OUTSIDE the workspace folder and on
// an untitled buffer, plus an in-workspace byte-for-byte regression. Runs in the
// WITH-workspace EDH pass (a folder is open; the out-of-folder file lives in a
// temp dir outside it — exactly like diffView's out-of-folder test).
suite("F8 out-of-workspace authoring (host E2E — programmatic seam, no LLM)", () => {
  test("out-of-folder file: propose→accept lands Claude-attributed; persisted in GLOBAL storage, no .threads (PUC-1, INV-9/24/25)", async () => {
    const outsideDir = fs.mkdtempSync(path.join(os.tmpdir(), "cowriting-oow-"));
    const outsidePath = path.join(outsideDir, "sibling.md");
    const TARGET = "The sibling-repo sentence Claude edits.";
    fs.writeFileSync(outsidePath, `# Sibling\n\n${TARGET}\n`, "utf8");
    const uri = vscode.Uri.file(outsidePath);
    const doc = await vscode.workspace.openTextDocument(uri);
    await vscode.window.showTextDocument(doc);
    await settle();
    const api = await getApi();
    const key = uri.toString();

    const id = await proposeViaCommand(key, doc.getText(), TARGET, "The sibling sentence CLAUDE REWROTE.", "turn-oow1");
    await settle();
    // routed to global storage, never the repo
    const sidecar = api.sidecarRouter.sidecarPath(key)!;
    assert.ok(sidecar && fs.existsSync(sidecar), `global sidecar exists at ${sidecar}`);
    assert.ok(sidecar.includes(`${path.sep}sidecars${path.sep}`), "lives under <globalStorage>/sidecars/");
    assert.ok(!sidecar.includes(`${path.sep}.threads${path.sep}`), "NOT in a .threads/ tree (INV-25)");
    assert.ok(!fs.existsSync(path.join(outsideDir, ".threads")), "no .threads/ written beside the out-of-folder file");

    assert.ok(await api.proposalController.acceptById(key, id), "accept applies via the seam");
    await settle();
    assert.ok(doc.getText().includes("The sibling sentence CLAUDE REWROTE."), "replacement landed");
    const agent = api.attributionController.getSpans(key).find((s) => s.turnId === "turn-oow1");
    assert.ok(agent && agent.authorKind === "agent", "accepted text is Claude-attributed");
    assert.strictEqual(api.proposalController.getRendered(key).length, 0, "proposal gone (INV-13)");

    // a thread can be opened on the out-of-folder doc
    await vscode.window.showTextDocument(doc);
    const editor = vscode.window.activeTextEditor!;
    editor.selection = new vscode.Selection(doc.positionAt(0), doc.positionAt(8));
    const threadId = await api.threadController.createThreadOnSelection("thread on a sibling file");
    assert.ok(threadId, "a thread opens on the out-of-folder doc");

    // reload-restore from the GLOBAL sidecar (re-anchor content-based)
    fs.writeFileSync(outsidePath, "PREPENDED\n\n" + doc.getText(), "utf8");
    const reloaded = await vscode.workspace.openTextDocument(uri);
    await vscode.window.showTextDocument(reloaded);
    await vscode.commands.executeCommand("workbench.action.files.revert");
    await settle();
    api.threadController.renderAll(reloaded);
    assert.strictEqual(api.threadController.getRendered(key).length, 1, "thread restored from the global sidecar after reload");

    fs.rmSync(outsideDir, { recursive: true, force: true });
  });

  test("untitled buffer: propose→accept works in-session, state in-memory only (PUC-2)", async () => {
    const TARGET = "The untitled draft sentence.";
    const untitled = await vscode.workspace.openTextDocument({ content: `${TARGET}\n`, language: "markdown" });
    await vscode.window.showTextDocument(untitled);
    await settle();
    const api = await getApi();
    const key = untitled.uri.toString();
    assert.strictEqual(untitled.uri.scheme, "untitled", "really untitled");

    const id = await proposeViaCommand(key, untitled.getText(), TARGET, "The untitled draft, CLAUDE-EDITED.", "turn-oow2");
    await settle();
    assert.strictEqual(api.sidecarRouter.sidecarPath(key), undefined, "untitled artifact is in-memory only (no disk)");
    assert.ok(await api.proposalController.acceptById(key, id), "accept applies");
    await settle();
    assert.ok(untitled.getText().includes("The untitled draft, CLAUDE-EDITED."), "replacement landed in the untitled buffer");
    const agent = api.attributionController.getSpans(key).find((s) => s.turnId === "turn-oow2");
    assert.ok(agent && agent.authorKind === "agent", "untitled accepted text is Claude-attributed");
  });

  test("in-workspace regression: artifact still lands at <root>/.threads/<repo-rel>.json with the repo-relative document.path (INV-2)", async () => {
    const DOC_REL = "docs/f8regression.md";
    const TARGET = "An in-folder sentence for the F8 regression.";
    const abs = path.join(WS, DOC_REL);
    fs.mkdirSync(path.dirname(abs), { recursive: true });
    fs.writeFileSync(abs, `# F8 regression\n\n${TARGET}\n`, "utf8");
    const uri = vscode.Uri.file(abs);
    const doc = await vscode.workspace.openTextDocument(uri);
    await vscode.window.showTextDocument(doc);
    await settle();
    const api = await getApi();

    // the in-workspace key is the repo-relative path, not the URI string
    assert.strictEqual(
      api.sidecarRouter.keyOf({ uri: uri.toString(), fsPath: abs, scheme: "file" }),
      DOC_REL,
      "in-folder key is the repo-relative path",
    );
    const id = await proposeViaCommand(uri.toString(), doc.getText(), TARGET, "An in-folder sentence, EDITED.", "turn-oow3");
    await settle();
    assert.ok(await api.proposalController.acceptById(DOC_REL, id), "accept by the repo-relative key");
    await settle();
    const sidecar = api.sidecarRouter.sidecarPath(DOC_REL)!;
    assert.strictEqual(sidecar, path.join(WS, ".threads", "docs", "f8regression.md.json"), "committable .threads/ path unchanged (INV-2)");
    assert.ok(fs.existsSync(sidecar), "sidecar written in the repo");
    const onDisk = JSON.parse(fs.readFileSync(sidecar, "utf8"));
    assert.strictEqual(onDisk.document.path, DOC_REL, "document.path is the repo-relative path (byte-for-byte)");
  });
});