/**
 * @file Tests for the hook writer's per-transcript "already handled" marks
 * (`transcriptMarks` in server/routes/hooks.js): a hook whose transcript is
 * unchanged skips the token / compaction / API-error / turn-duration writes,
 * a grown transcript is walked only from the last entry handled, and the rows
 * left behind are exactly the ones a full re-walk would have written.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { describe, it, before, after } = require("node:test");
const assert = require("node:assert/strict");
const path = require("path");
const fs = require("fs");
const os = require("os");
const http = require("http");

const TMP = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-marks-"));
process.env.DASHBOARD_DB_PATH = path.join(TMP, "dashboard.db");
process.env.CLAUDE_HOME = path.join(TMP, "home");
process.env.DASHBOARD_DATA_DIR = path.join(TMP, "data");

const { createApp, startServer } = require("../index");
const { db } = require("../db");
const hooksRouter = require("../routes/hooks");

let server;
let BASE;

function post(body) {
  return new Promise((resolve, reject) => {
    const url = new URL("/api/hooks/event", BASE);
    const payload = JSON.stringify(body);
    const r = http.request(
      {
        hostname: url.hostname,
        port: url.port,
        path: url.pathname,
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          "Content-Length": Buffer.byteLength(payload),
        },
      },
      (res) => {
        res.resume();
        res.on("end", () => resolve(res.statusCode));
      }
    );
    r.on("error", reject);
    r.write(payload);
    r.end();
  });
}

const line = (o) => JSON.stringify(o) + "\n";
const assistant = (id, inTok) => ({
  type: "assistant",
  timestamp: "2026-09-18T01:00:00.000Z",
  message: {
    id,
    model: "claude-sonnet-5",
    content: [{ type: "text", text: "ok" }],
    usage: { input_tokens: inTok, output_tokens: 1 },
  },
});
const turn = (ms, ts) => ({
  type: "system",
  subtype: "turn_duration",
  durationMs: ms,
  timestamp: ts,
});
const apiError = (text, ts) => ({
  type: "assistant",
  isApiErrorMessage: true,
  error: "rate_limit",
  timestamp: ts,
  message: { content: [{ type: "text", text }] },
});
const compact = (uuid, ts) => ({ type: "user", isCompactSummary: true, uuid, timestamp: ts });

function rows(sid) {
  const ev = db
    .prepare(
      "SELECT event_type, summary, created_at FROM events WHERE session_id = ? AND event_type IN ('TurnDuration','APIError','Compaction') ORDER BY event_type, created_at, summary"
    )
    .all(sid)
    .map((r) =>
      r.event_type === "APIError"
        ? `${r.event_type}|${r.summary}`
        : `${r.event_type}|${r.created_at}|${r.summary}`
    );
  const tokens = db
    .prepare("SELECT model, input_tokens, baseline_input FROM token_usage WHERE session_id = ?")
    .all(sid);
  return { ev, tokens };
}

before(async () => {
  server = await startServer(createApp(), 0);
  BASE = `http://127.0.0.1:${server.address().port}`;
});

after(() => {
  server?.close();
  fs.rmSync(TMP, { recursive: true, force: true });
});

describe("transcript marks", () => {
  it("skips an unchanged transcript and walks only the new tail of a grown one", async () => {
    const sid = "abababab-1111-4111-8111-abababababab";
    const cwd = path.join(TMP, "work");
    fs.mkdirSync(cwd, { recursive: true });
    const tpath = path.join(TMP, `${sid}.jsonl`);
    fs.writeFileSync(
      tpath,
      line(assistant("m1", 5)) +
        line(turn(1000, "2026-09-18T01:00:01.000Z")) +
        line(apiError("slow down", "2026-09-18T01:00:02.000Z")) +
        line(compact("c-1", "2026-09-18T01:00:03.000Z")) +
        line(assistant("m2", 7)) +
        line(turn(2000, "2026-09-18T01:00:04.000Z"))
    );
    const data = { session_id: sid, cwd, transcript_path: tpath };

    assert.equal(await post({ hook_type: "PostToolUse", data }), 200);
    const first = rows(sid);
    assert.equal(first.ev.filter((e) => e.startsWith("TurnDuration")).length, 2);
    assert.equal(first.ev.filter((e) => e.startsWith("APIError")).length, 1);
    assert.equal(first.ev.filter((e) => e.startsWith("Compaction")).length, 1);
    assert.ok(hooksRouter.transcriptMarks.size >= 1, "a mark is kept after commit");

    // Proof of the skip: a row removed behind the writer's back is NOT put
    // back by a hook whose transcript did not change (before, every hook
    // re-walked the whole history and re-inserted it).
    db.prepare(
      "DELETE FROM events WHERE session_id = ? AND event_type = 'TurnDuration' AND created_at = '2026-09-18T01:00:01.000Z'"
    ).run(sid);
    assert.equal(await post({ hook_type: "PostToolUse", data: { ...data, tool_name: "x" } }), 200);
    assert.equal(rows(sid).ev.filter((e) => e.startsWith("TurnDuration")).length, 1);
    db.prepare("DELETE FROM events WHERE session_id = ? AND event_type = 'TurnDuration'").run(sid);
    hooksRouter.transcriptMarks.clear();
    assert.equal(await post({ hook_type: "PostToolUse", data: { ...data, tool_name: "y" } }), 200);
    assert.deepEqual(rows(sid), first, "a cleared mark re-walks the whole history, as before");

    // Grow it: one turn, one new error, a repeat of the old error, a compaction.
    fs.appendFileSync(
      tpath,
      line(assistant("m3", 11)) +
        line(turn(3000, "2026-09-18T01:00:05.000Z")) +
        line(apiError("slow down", "2026-09-18T01:00:06.000Z")) +
        line(apiError("overloaded", "2026-09-18T01:00:07.000Z")) +
        line(compact("c-2", "2026-09-18T01:00:08.000Z"))
    );
    assert.equal(await post({ hook_type: "Stop", data }), 200);
    const grown = rows(sid);

    // The same transcript walked from scratch must produce the same rows.
    hooksRouter.transcriptMarks.clear();
    assert.equal(await post({ hook_type: "Stop", data: { ...data, stop_hook_active: true } }), 200);
    assert.deepEqual(rows(sid), grown, "the delta wrote exactly what a full walk writes");
    assert.equal(grown.ev.filter((e) => e.startsWith("TurnDuration")).length, 3);
    assert.equal(grown.ev.filter((e) => e.startsWith("APIError")).length, 2, "repeat deduped");
    assert.equal(grown.ev.filter((e) => e.startsWith("Compaction")).length, 2);
    assert.equal(grown.tokens.length, 1);
    assert.equal(grown.tokens[0].input_tokens + grown.tokens[0].baseline_input, 23);
  });
});