/*
  Sub-Store operator (production-friendly)
  - Pull dynamic value from router/runtime and server/runtime JSON
  - Replace vmess server field for matched nodes
*/

const ROUTER_VALUE_JSON_URL = "http://<router-lan-ip>:8080/current_ip.json";
const SERVER_VALUE_JSON_URL = "https://git.dewofaurora.de/aurora/vmess-domain-rotator/raw/runtime-state/runtime/current_domain.json";
const ROUTER_MIN_SPEED_MBPS = 5;

const NODE_NAME_REGEX = /(argo|cf|vm|优选)/i;
const CACHE_KEY = "vmess-domain-rotator:current";
const CACHE_TTL_MS = 5 * 60 * 1000;
const JSON_VALUE_KEYS = ["domain", "ip"];

async function fetchRuntimeJson(url, sourceName) {
  const $ = $substore;
  const { body, statusCode } = await $.http.get({
    url,
    headers: {
      Accept: "application/json",
      "Cache-Control": "no-cache"
    },
    timeout: 5000
  });

  if (statusCode < 200 || statusCode >= 300) {
    throw new Error(`${sourceName} http status ${statusCode}`);
  }

  let obj;
  try {
    obj = JSON.parse(body || "{}");
  } catch (e) {
    throw new Error(`${sourceName} invalid json: ${e.message}`);
  }

  return obj;
}

function extractValue(obj, sourceName) {
  let value = "";
  for (const key of JSON_VALUE_KEYS) {
    value = String(obj[key] || "").trim().toLowerCase();
    if (value) break;
  }

  if (!value) {
    throw new Error(`${sourceName} empty value field, expected one of: ${JSON_VALUE_KEYS.join(", ")}`);
  }

  return value;
}

function parseRouterSpeedMbps(routerObj) {
  const raw = String(routerObj?.top_candidates?.[0]?.download_speed || "").trim();
  if (!raw) {
    return { mbps: null, raw: "", status: "missing", unit: "" };
  }

  const normalized = raw.toLowerCase().replace(/\s+/g, "");
  const match = normalized.match(/([0-9]+(?:\.[0-9]+)?)/);
  if (!match) {
    return { mbps: null, raw, status: "invalid", unit: "" };
  }

  const numeric = Number(match[1]);
  if (!Number.isFinite(numeric) || numeric < 0) {
    return { mbps: null, raw, status: "invalid", unit: "" };
  }

  let mbps = numeric;
  let unit = "unknown";

  if (normalized.includes("gb/s") || normalized.includes("g/s") || normalized.endsWith("gb") || normalized.endsWith("g")) {
    mbps = numeric * 1024;
    unit = "gb/s";
  } else if (normalized.includes("mb/s") || normalized.includes("m/s") || normalized.endsWith("mb") || normalized.endsWith("m")) {
    mbps = numeric;
    unit = "mb/s";
  } else if (normalized.includes("kb/s") || normalized.includes("k/s") || normalized.endsWith("kb") || normalized.endsWith("k")) {
    mbps = numeric / 1024;
    unit = "kb/s";
  } else if (normalized.includes("b/s")) {
    mbps = numeric / (1024 * 1024);
    unit = "b/s";
  }

  const status = unit === "unknown" ? "unknown_unit" : "ok";
  return { mbps, raw, status, unit };
}

async function selectValueRouterFirst() {
  const telemetry = {
    router: { ok: false, value: "", status: "", sourceType: "", error: "", speedRaw: "", speedMbps: null, speedParse: "missing", speedUnit: "" },
    server: { ok: false, value: "", status: "", sourceType: "", error: "" }
  };

  try {
    const routerObj = await fetchRuntimeJson(ROUTER_VALUE_JSON_URL, "router");
    const routerValue = extractValue(routerObj, "router");
    const speed = parseRouterSpeedMbps(routerObj);

    telemetry.router.ok = true;
    telemetry.router.value = routerValue;
    telemetry.router.status = String(routerObj?.status || "");
    telemetry.router.sourceType = String(routerObj?.source_type || "");
    telemetry.router.speedRaw = speed.raw;
    telemetry.router.speedMbps = speed.mbps;
    telemetry.router.speedParse = speed.status;
    telemetry.router.speedUnit = speed.unit;
  } catch (e) {
    telemetry.router.error = String(e.message || e);
  }

  try {
    const serverObj = await fetchRuntimeJson(SERVER_VALUE_JSON_URL, "server");
    const serverValue = extractValue(serverObj, "server");

    telemetry.server.ok = true;
    telemetry.server.value = serverValue;
    telemetry.server.status = String(serverObj?.status || "");
    telemetry.server.sourceType = String(serverObj?.source_type || "");
  } catch (e) {
    telemetry.server.error = String(e.message || e);
  }

  if (!telemetry.router.ok && !telemetry.server.ok) {
    throw new Error(`router failed: ${telemetry.router.error}; server failed: ${telemetry.server.error}`);
  }

  if (!telemetry.router.ok && telemetry.server.ok) {
    return { value: telemetry.server.value, chosenSource: "server", reason: "router_fail", telemetry };
  }

  if (telemetry.router.ok && !telemetry.server.ok) {
    return { value: telemetry.router.value, chosenSource: "router", reason: "server_fail", telemetry };
  }

  if (telemetry.router.speedParse === "ok" && telemetry.router.speedMbps < ROUTER_MIN_SPEED_MBPS) {
    return { value: telemetry.server.value, chosenSource: "server", reason: "router_low_speed", telemetry };
  }

  return { value: telemetry.router.value, chosenSource: "router", reason: "router_preferred", telemetry };
}

async function operator(proxies = [], targetPlatform, context) {
  const cache = scriptResourceCache;
  let value = cache.get(CACHE_KEY);
  let decision = null;

  if (!value) {
    try {
      decision = await selectValueRouterFirst();
      value = decision.value;
      cache.set(CACHE_KEY, value, CACHE_TTL_MS);
    } catch (e) {
      console.log(`[vmess-domain-rotator] fetch failed: ${e.message}`);
      return proxies;
    }
  }

  let updated = 0;
  for (const p of proxies) {
    if (!p || p.type !== "vmess") continue;
    if (!NODE_NAME_REGEX.test(p.name || "")) continue;

    if (p.server !== value) {
      p.server = value;
      updated += 1;
    }
  }

  if (decision) {
    const t = decision.telemetry;
    console.log(
      `[vmess-domain-rotator] chosen=${decision.chosenSource}, reason=${decision.reason}, router_status=${t.router.status || "n/a"}, server_status=${t.server.status || "n/a"}, router_speed_raw=${t.router.speedRaw || "n/a"}, router_speed_mbps=${t.router.speedMbps == null ? "n/a" : t.router.speedMbps.toFixed(3)}, speed_parse=${t.router.speedParse}, threshold_mbps=${ROUTER_MIN_SPEED_MBPS}, value=${value}, updated=${updated}, total=${proxies.length}, target=${targetPlatform}`
    );
  } else {
    console.log(`[vmess-domain-rotator] chosen=cache, value=${value}, updated=${updated}, total=${proxies.length}, target=${targetPlatform}`);
  }

  return proxies;
}