// File: server/rr/rr-service-vehicles.js
// Idempotent Service Vehicle ensure: if VIN exists (owner match or not), don't fail.

const RRLogger = require("./rr-logger");
const { buildClientAndOpts, rrCombinedSearch } = require("./rr-lookup");

// --- helpers ---
function pickVin({ vin, job }) {
  const v = vin || job?.v_vin || job?.vehicle?.vin || job?.vin || job?.vehicleVin || null;

  if (!v) return "";
  return String(v)
    .replace(/[^A-Za-z0-9]/g, "")
    .toUpperCase()
    .slice(0, 17);
}

function pickCustNo({ selectedCustomerNo, custNo, customerNo }) {
  const c = selectedCustomerNo ?? custNo ?? customerNo ?? null;
  return c != null ? String(c).trim() : "";
}

function ownersFromCombined(res, wantedVin) {
  const blocks = Array.isArray(res?.data) ? res.data : Array.isArray(res) ? res : [];
  const owners = new Set();
  for (const blk of blocks) {
    const serv = Array.isArray(blk?.ServVehicle) ? blk.ServVehicle : [];
    for (const sv of serv) {
      const v = sv?.Vehicle || {};
      const vin = (v?.Vin || v?.VIN || v?.vin || "").toString().toUpperCase();
      const cust = sv?.VehicleServInfo?.CustomerNo;
      if (vin && cust && (!wantedVin || vin === wantedVin)) {
        owners.add(String(cust));
      }
    }
  }
  return owners;
}

function isAlreadyExistsError(e) {
  if (!e) return false;
  if (e.code === 300) return true;
  const msg = (e.message || "").toUpperCase();
  return msg.includes("ALREADY EXISTS") || msg.includes("VEHICLE ALREADY EXISTS");
}

/**
 * Ensure/create a Service Vehicle in RR for the given VIN + customer.
 * Args may contain:
 *  - client, routing  (prebuilt)  OR  bodyshop (we'll build a client)
 *  - vin OR job (we'll derive vin from job)
 *  - selectedCustomerNo / custNo / customerNo
 *  - license (optional)
 *  - socket (for logging)
 *  - logNs (namespace for logs)
 *
 * Returns: { created:boolean, exists:boolean, vin, customerNo, svId?, status? }
 */
async function ensureRRServiceVehicle(args = {}) {
  const {
    client: inClient,
    routing: inRouting,
    bodyshop,
    job,
    vin,
    selectedCustomerNo,
    custNo,
    customerNo,
    license,
    socket,
    logNs = "rr-service-vehicles"
  } = args;

  const log = RRLogger(socket, { ns: logNs });

  // Build/derive essentials
  let client = inClient;
  let routing = inRouting;

  if (!client || !routing) {
    if (!bodyshop) {
      throw new Error("ensureRRServiceVehicle: either (client & routing) or bodyshop is required");
    }
    const built = buildClientAndOpts(bodyshop);
    client = built.client;
    routing = built.opts?.routing;
  }

  const vinStr = pickVin({ vin, job });
  const custNoStr = pickCustNo({ selectedCustomerNo, custNo, customerNo });

  if (!vinStr) throw new Error("ensureRRServiceVehicle: vin required");
  if (!custNoStr) throw new Error("ensureRRServiceVehicle: customerNo required");

  // --- Preflight: does VIN already exist (and under whom)? ---
  try {
    let owners = new Set();
    if (bodyshop) {
      const comb = await rrCombinedSearch(bodyshop, { kind: "vin", vin: vinStr, maxResults: 50 });
      owners = ownersFromCombined(comb, vinStr);
    }
    // Short-circuit: VIN exists anywhere -> don't try to insert
    if (owners.size > 0) {
      const ownedBySame = owners.has(custNoStr);
      log(ownedBySame ? "info" : "warn", "{SV} VIN already present in RR; skipping insert", {
        vin: vinStr,
        selectedCustomerNo: custNoStr,
        owners: Array.from(owners)
      });
      return {
        created: false,
        exists: true,
        vin: vinStr,
        customerNo: custNoStr,
        ownedBySame
      };
    }
  } catch (e) {
    // Preflight shouldn't be fatal; log and continue to insert (idempotency will still be handled)
    log("warn", "{SV} VIN preflight lookup failed; continuing to insert", { vin: vinStr, error: e?.message });
  }

  // --- Attempt insert (idempotent) ---
  // IMPORTANT: The current RR lib build validates `vehicleServInfo.customerNo`.
  // To be future-proof, we also include top-level `customerNo`.
  const insertPayload = {
    vin: vinStr,
    customerNo: custNoStr, // fallback form (some builds accept this)
    vehicleServInfo: { customerNo: custNoStr }, // primary form expected by the lib
    vehicleDetail: license ? { licNo: String(license).trim() } : undefined
  };

  const insertOpts = {
    routing,
    envelope: {
      sender: {
        component: "Rome",
        task: "SV",
        referenceId: "Insert",
        creator: "RCI",
        senderName: "RCI"
      }
    }
  };

  log("debug", "{SV} Inserting service vehicle", {
    vin: vinStr,
    selectedCustomerNo: custNoStr,
    payloadShape: Object.keys(insertPayload).filter((k) => insertPayload[k] != null)
  });

  // Be tolerant to method name differences
  const fnName =
    typeof client.insertServiceVehicle === "function"
      ? "insertServiceVehicle"
      : typeof client.serviceVehicleInsert === "function"
        ? "serviceVehicleInsert"
        : null;

  if (!fnName) {
    throw new Error("RR client does not expose insertServiceVehicle/serviceVehicleInsert");
  }

  try {
    const res = await client[fnName](insertPayload, insertOpts);
    const data = res?.data ?? {};
    const svId = data?.dmsRecKey || data?.svId || undefined;

    log("info", "{SV} insertServiceVehicle: success", { vin: vinStr, customerNo: custNoStr, svId });
    return {
      created: true,
      exists: false,
      vin: vinStr,
      customerNo: custNoStr,
      svId,
      status: res?.statusBlocks?.transaction
    };
  } catch (e) {
    if (isAlreadyExistsError(e)) {
      // Treat as idempotent success
      log("warn", "{SV} insertServiceVehicle: already exists; treating as success", {
        vin: vinStr,
        customerNo: custNoStr,
        code: e?.code,
        status: e?.meta?.status || e?.status
      });
      return {
        created: false,
        exists: true,
        vin: vinStr,
        customerNo: custNoStr,
        status: e?.meta?.status || e?.status
      };
    }
    log("error", "{SV} insertServiceVehicle: failure", {
      message: e?.message,
      code: e?.code,
      status: e?.meta?.status || e?.status
    });
    throw e;
  }
}

module.exports = {
  ensureRRServiceVehicle
};