/**
 * FleetAI probe — run this BEFORE building anything on top of the tracker.
 *
 *   node scripts/fleetai-probe.mjs
 *
 * Reads FLEETAI_* from .env. Read-only: authenticates, lists vehicles,
 * pulls one fleet-wide position snapshot, prints what came back.
 *
 * It exists to settle three assumptions that the whole rep check-in
 * design rests on and that no amount of reading the PDF can answer:
 *
 *   1. Does each rep have a dedicated vehicle, under a registration we
 *      can map to a WFDASH user? If reps share a bakkie,
 *      `users.tracker_vehicle_id` is the wrong model.
 *   2. Does the response carry `GPSActualTime` (the real GPS fix) or
 *      only `Datetime` / `timestamp` (when the platform received it)?
 *      That decides how honest the check-in staleness warning can be.
 *   3. Is FLEETAI_COMPANY_NAME spelled exactly as the platform has it?
 *      A mismatch returns "No Company Found For Given User", which
 *      otherwise reads as "no vehicles today".
 *
 * Throwaway by design — delete it once the answers are known.
 */

import { readFileSync } from "node:fs";

function loadEnv() {
  let raw = "";
  try {
    raw = readFileSync(".env", "utf8");
  } catch {
    console.warn("No .env found — falling back to process.env only.\n");
  }
  const fromFile = Object.fromEntries(
    raw
      .split("\n")
      .filter((line) => line.includes("=") && !line.trim().startsWith("#"))
      .map((line) => {
        const i = line.indexOf("=");
        return [line.slice(0, i).trim(), line.slice(i + 1).trim()];
      })
  );
  return { ...fromFile, ...process.env };
}

const env = loadEnv();
const BASE = (env.FLEETAI_BASE_URL || "https://fleetai.netstar.co.za").replace(/\/$/, "");
const USERNAME = env.FLEETAI_USERNAME;
const PASSWORD = env.FLEETAI_PASSWORD;
const COMPANY = env.FLEETAI_COMPANY_NAME;
const PROJECT_ID = env.FLEETAI_PROJECT_ID || "37";

if (!USERNAME || !PASSWORD) {
  console.error(
    "Set FLEETAI_USERNAME and FLEETAI_PASSWORD in .env first.\n" +
      "The account must be Company or Company Sub-Account level —\n" +
      "FleetAI rejects Admin and Reseller logins outright."
  );
  process.exit(1);
}

/**
 * FleetAI returns HTTP 200 for errors too, so every response body has to
 * be inspected rather than trusting the status.
 */
async function post(endpoint, payload, headers = {}) {
  const url = `${BASE}/webservice?token=${endpoint}`;
  const res = await fetch(url, {
    method: "POST",
    headers: { "Content-Type": "application/json", ...headers },
    body: JSON.stringify(payload),
  });
  const text = await res.text();
  let body;
  try {
    body = JSON.parse(text);
  } catch {
    console.error(`\n✗ ${endpoint} returned non-JSON (HTTP ${res.status}):`);
    console.error(text.slice(0, 400));
    process.exit(1);
  }
  const failed =
    String(body?.RESULT ?? body?.result ?? "").toUpperCase() === "FAIL" ||
    body?.root?.error;
  if (failed) {
    console.error(`\n✗ ${endpoint} failed:`);
    console.error(JSON.stringify(body, null, 2).slice(0, 800));
    process.exit(1);
  }
  return body;
}

console.log(`FleetAI probe → ${BASE}\n`);

/* 1. Authenticate ---------------------------------------------------- */
const auth = await post("generateAccessToken", {
  username: USERNAME,
  password: PASSWORD,
});
const token = auth?.token;
if (!token) {
  console.error("✗ No token in the response:");
  console.error(JSON.stringify(auth, null, 2).slice(0, 800));
  console.error(
    "\nMost likely cause: the account is Admin or Reseller level.\n" +
      "FleetAI only accepts Company or Company Sub-Account logins."
  );
  process.exit(1);
}
console.log("✓ Authenticated (token is 30-minute; refresh at 25)\n");

/* 2. Vehicle registry ------------------------------------------------ */
const registry = await post("viewVehicle", { project_id: PROJECT_ID }, { "auth-code": token });
const vehicles = Array.isArray(registry?.data) ? registry.data : [];

console.log(`── QUESTION 1: which vehicles exist? (${vehicles.length} found)`);
if (vehicles.length === 0) {
  console.log("  (none — check project_id, currently " + PROJECT_ID + ")");
}
for (const v of vehicles) {
  console.log(
    `  ${String(v.plate_no ?? "?").padEnd(14)} imei=${String(v.imei_no ?? "?").padEnd(18)} ${v.device_name ?? ""}`
  );
}
console.log(
  "\n  → Can each of Chris / Tiaan / George / Calvin be matched to exactly\n" +
    "    one registration above? If they share vehicles, tell me — the\n" +
    "    rep→vehicle model changes.\n"
);

/* 3. Fleet-wide live snapshot ---------------------------------------- */
if (!COMPANY) {
  console.log("── QUESTION 3: FLEETAI_COMPANY_NAME is not set, skipping the fleet poll.");
  console.log("   The poller needs it. Set it and re-run to verify the spelling.\n");
  process.exit(0);
}

const live = await post(
  `getTokenBaseLiveData&ProjectId=${encodeURIComponent(PROJECT_ID)}`,
  { company_names: COMPANY, format: "json" },
  { "auth-code": token }
);
const rows = live?.root?.VehicleData ?? live?.data ?? [];
const list = Array.isArray(rows) ? rows : [rows];

console.log(`── QUESTION 3: company name "${COMPANY}" accepted ✓ (${list.length} rows)\n`);
console.log("── QUESTION 2: which timestamp fields come back?\n");

const first = list[0];
if (!first) {
  console.log("  (no rows — vehicles may all be INACTIVE)");
} else {
  for (const key of ["Vehicle_No", "Status", "Speed", "Latitude", "Longitude", "IGN"]) {
    console.log(`  ${key.padEnd(16)} ${JSON.stringify(first[key])}`);
  }
  console.log("");
  for (const key of ["GPSActualTime", "Datetime", "timestamp"]) {
    const present = key in first ? JSON.stringify(first[key]) : "— ABSENT —";
    console.log(`  ${key.padEnd(16)} ${present}`);
  }
  console.log(
    "\n  → GPSActualTime present means the staleness warning reflects the\n" +
      "    vehicle. Only Datetime means it reflects the network instead.\n" +
      "  → Timestamps should read as UTC+2 (SAST). If they look like UTC,\n" +
      "    set FLEETAI_TZ_OFFSET_MINUTES=0.\n"
  );

  console.log("── Full first row, for reference:\n");
  console.log(JSON.stringify(first, null, 2));
}