/**
 * @file Tests server/lib/cursor-usage.js — Cursor sessions from its agent
 * transcripts: a session created as `tool = 'cursor'` with its name, cwd (the
 * project slug walked back onto the filesystem) and no tokens, an unchanged
 * file never re-read, a quiet one settled to completed, a session the user
 * deleted staying deleted, and a non-cursor row with the same id never
 * touched. The Cursor dir and the DB are temp dirs; the transcripts are
 * synthetic, in the shape Cursor writes.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const os = require("node:os");
const fs = require("node:fs");
const path = require("node:path");

const ROOT = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-cursor-usage-"));
process.env.DASHBOARD_DB_PATH = path.join(ROOT, "dashboard.db");
process.env.AGENTHUB_CURSOR_DIR = path.join(ROOT, "cursor");

const { describe, it, beforeEach, after } = require("node:test");
const assert = require("node:assert/strict");
const { db } = require("../db");
const cursor = require("../lib/cursor-usage");

after(() => fs.rmSync(ROOT, { recursive: true, force: true }));

const ID = "7481e37e-9157-4145-b985-2ea9a2117f52";
const PROJECT = path.join(fs.realpathSync(ROOT), "work", "my app");
fs.mkdirSync(PROJECT, { recursive: true });
const slugOf = (p) => p.replace(/^\/+/, "").replace(/[^A-Za-z0-9]/g, "-");

function transcript(
  id,
  { slug = slugOf(PROJECT), prompt = "Review the campaign code\nplease" } = {}
) {
  const dir = path.join(process.env.AGENTHUB_CURSOR_DIR, "projects", slug, "agent-transcripts", id);
  fs.mkdirSync(dir, { recursive: true });
  const file = path.join(dir, `${id}.jsonl`);
  const lines = [
    {
      role: "user",
      message: {
        content: [
          {
            type: "text",
            text: `<timestamp>Thursday, Jun 11, 2026, 4:53 PM (UTC+7)</timestamp>\n<user_query>\n${prompt}\n</user_query>`,
          },
        ],
      },
    },
    { role: "assistant", message: { content: [{ type: "tool_use", name: "Read", input: {} }] } },
    { type: "turn_ended", status: "success" },
  ];
  fs.writeFileSync(file, lines.map((l) => JSON.stringify(l)).join("\n") + "\n");
  return file;
}

function age(file, ms) {
  const t = new Date(Date.now() - ms);
  fs.utimesSync(file, t, t);
}

const session = (id) => db.prepare("SELECT * FROM sessions WHERE id = ?").get(id);

beforeEach(() => {
  fs.rmSync(process.env.AGENTHUB_CURSOR_DIR, { recursive: true, force: true });
  db.exec(
    "DELETE FROM token_usage; DELETE FROM agents; DELETE FROM sessions; DELETE FROM cursor_transcripts;"
  );
});

describe("cursor usage", () => {
  it("walks a project slug back to an existing directory, else null", () => {
    assert.equal(cursor.cwdFromSlug(slugOf(PROJECT)), PROJECT);
    assert.equal(cursor.cwdFromSlug(slugOf(`${PROJECT}-gone`)), null);
    assert.equal(cursor.cwdFromSlug("empty-window"), null);
    assert.equal(cursor.cwdFromSlug(""), null);
  });

  it("bounds the walk: no symlink is followed, and it gives up after a budget", () => {
    const base = path.join(fs.realpathSync(ROOT), "maze");
    // A symlink loop: every `a` and `a-a` is the same directory again.
    const loop = path.join(base, "loop");
    fs.mkdirSync(loop, { recursive: true });
    fs.symlinkSync(".", path.join(loop, "a"));
    fs.symlinkSync(".", path.join(loop, "a-a"));
    // A real tree with ~1000 directories that all prefix the slug.
    const tree = path.join(base, "tree");
    const grow = (dir, t) => {
      if (t <= 0) return;
      fs.mkdirSync(path.join(dir, "a"), { recursive: true });
      grow(path.join(dir, "a"), t - 1);
      if (t < 2) return;
      fs.mkdirSync(path.join(dir, "a-a"), { recursive: true });
      grow(path.join(dir, "a-a"), t - 2);
    };
    grow(tree, 13);
    const real = fs.readdirSync;
    let calls = 0;
    fs.readdirSync = (...a) => {
      if (++calls > 5000) throw new Error("unbounded walk");
      return real(...a);
    };
    try {
      assert.equal(cursor.cwdFromSlug(`${slugOf(loop)}${"-a".repeat(30)}-z`), null);
      assert.ok(calls < 20, `followed a symlink loop: ${calls} reads`);
      calls = 0;
      assert.equal(cursor.cwdFromSlug(`${slugOf(tree)}${"-a".repeat(13)}-z`), null);
      assert.ok(calls <= 501, `walked ${calls} directories`);
      assert.equal(cursor.cwdFromSlug(slugOf(PROJECT)), PROJECT);
    } finally {
      fs.readdirSync = real;
      fs.rmSync(base, { recursive: true, force: true });
    }
  });

  it("creates the session with its name and cwd, and no tokens", async () => {
    transcript(ID);
    assert.deepEqual(await cursor.ingestCursorUsage(), { files: 1, sessions: 1 });
    const s = session(ID);
    assert.equal(s.tool, "cursor");
    assert.equal(s.name, "Review the campaign code");
    assert.equal(s.cwd, PROJECT);
    assert.equal(s.model, null);
    assert.equal(s.status, "active");
    assert.equal(s.transcript_path, null);
    assert.equal(db.prepare("SELECT COUNT(*) c FROM token_usage").get().c, 0);
    // Unchanged: never re-read.
    assert.deepEqual(await cursor.ingestCursorUsage(), { files: 0, sessions: 0 });
  });

  it("settles a quiet session to completed, and reads an old one completed", async () => {
    const file = transcript(ID);
    await cursor.ingestCursorUsage();
    const seen = db.prepare("SELECT mtime_ms FROM cursor_transcripts").get().mtime_ms;
    assert.deepEqual(await cursor.ingestCursorUsage({ now: seen + 5 * 60_000 }), {
      files: 0,
      sessions: 1,
    });
    assert.equal(session(ID).status, "completed");
    assert.equal(session(ID).ended_at, new Date(seen).toISOString());

    db.exec("DELETE FROM sessions; DELETE FROM cursor_transcripts;");
    age(file, 10 * 60_000);
    await cursor.ingestCursorUsage();
    assert.equal(session(ID).status, "completed");
  });

  it("keeps a deleted session deleted until Cursor writes again", async () => {
    const file = transcript(ID);
    age(file, 10 * 60_000);
    await cursor.ingestCursorUsage();
    db.prepare("DELETE FROM sessions WHERE id = ?").run(ID);
    await cursor.ingestCursorUsage();
    assert.equal(session(ID), undefined);
    fs.appendFileSync(file, JSON.stringify({ role: "user", message: { content: [] } }) + "\n");
    await cursor.ingestCursorUsage();
    assert.equal(session(ID).tool, "cursor");
  });

  it("never touches a session of another tool with the same id", async () => {
    db.prepare(
      "INSERT INTO sessions (id, name, status, tool) VALUES (?, 'mine', 'active', 'claude')"
    ).run(ID);
    transcript(ID, { slug: "empty-window" });
    await cursor.ingestCursorUsage();
    const s = session(ID);
    assert.equal(s.tool, "claude");
    assert.equal(s.name, "mine");
  });

  it("names a session with no prompt by its id, with no cwd", async () => {
    transcript(ID, { slug: "1778550192773", prompt: "" });
    await cursor.ingestCursorUsage();
    assert.equal(session(ID).name, `Cursor ${ID.slice(0, 8)}`);
    assert.equal(session(ID).cwd, null);
  });
});