// The manager's scheduled run (novox/hq ADR 0050/0053). It is the whole of the carve-out in one
// place, and it runs on the MANAGER NODE, never in the control plane:
//
//   1. read the refresh token as CLEARTEXT — the host unsealed the stored box with THIS node's private
//      key and mounted it at the module's bound secret path, exactly as it delivers any credential.
//      This module holds no node key and opens nothing itself;
//   2. call the vendor's OAuth token endpoint to mint a fresh access token (and maybe a rotated
//      refresh token);
//   3. if the vendor rotated the refresh token, SEAL the new one to this node's PUBLIC sealing key
//      (delivered in the bound facts) with the same anonymous box the mesh seals every credential with;
//   4. hand the control plane back ONLY the access token in the clear + the opaque re-sealed box —
//      never the refresh token — which it seals per consumer holder and stores;
//   5. poll usage with the fresh access token and record the licence-grain reading.
//
// mesh-controller receives the products of steps 3–4 through `licence submit-refresh` (access token +
// sealed box). The refresh token never leaves this process except as ciphertext, and it never had to
// be opened here at all — the host did that.
//
// This runs as `mesh-tools run`, which connects no broker, so the outputs are written to files the
// host mounts; the submit itself (the transport to mesh-controller) is done by the caller invoking
// `mesh-controller licence submit-refresh`. In the lab that caller is the scenario; in production it is
// an authenticated call the manager node makes. The transport is the one part stubbed here — FLAGGED
// — because a cross-node authenticated command surface is out of this module's scope.

import { readFileSync, writeFileSync, renameSync, mkdirSync } from "node:fs";
import { dirname } from "node:path";

import { readEnv } from "@novox/mesh-sdk/primitives";

import { seal } from "../sealedbox.js";
import { managerPublicKey, writeSealedGrant } from "../grantfile.js";
import { refreshGrant, grantFromRefresh, readUsage, flattenUsage, type UsageReading } from "../client.js";

/** The vendor-neutral usage row ADR 0054 fixes — the shape the model-usage store upserts. Kept local
 *  to the producer (the normalisation lives in the adapter), so nothing here couples to the SDK. */
interface UsageRow {
  licence: string;
  consumer: string;
  period: string;
  metric: string;
  value: number;
}

/** Normalise a licence-grain reading into ADR 0054 rows: one utilization row per window, a row
 *  omitted when its percentage is absent. `consumer` is the holding module — the licence grain. */
function licenceRows(licence: string, consumer: string, reading: UsageReading): UsageRow[] {
  const rows: UsageRow[] = [];
  const add = (period: string, pct: number | null): void => {
    if (pct !== null && pct !== undefined && Number.isFinite(pct)) {
      rows.push({ licence, consumer, period, metric: "utilization", value: pct });
    }
  };
  add("5h", reading.sessionPct);
  add("7d", reading.weeklyPct);
  add("extra", reading.extraPct);
  return rows;
}

function required(name: string): string {
  const v = process.env[name];
  if (!v) throw new Error(`${name} is not set — the manager runtime was deployed without it`);
  return v;
}

function atomicWrite(path: string, content: string): void {
  mkdirSync(dirname(path), { recursive: true });
  const tmp = `${path}.tmp`;
  writeFileSync(tmp, content, { mode: 0o600 });
  renameSync(tmp, path);
}

async function main(): Promise<void> {
  const licence = process.env.MESH_ANTHROPIC_LICENCE ?? "unknown";

  // Step 1: the refresh token as cleartext, unsealed and mounted by the HOST. No open here.
  const refreshToken = readFileSync(required("MESH_MODEL_ACCESS_SECRET_FILE"), "utf8").trim();
  if (!refreshToken) {
    // Nothing was delivered — the manager has not adopted a refresh token yet, or the push has not
    // landed. Said rather than treated as an empty token the vendor would reject obscurely.
    throw new Error("[anthropic-manager] no refresh token was delivered; adopt one first");
  }

  // The node's PUBLIC sealing key, to re-seal a rotated refresh token. Public, delivered in the facts.
  const nodePub = managerPublicKey(required("MESH_MODEL_ACCESS_BIND_FILE"));

  // Step 2: the vendor call.
  const refreshed = await refreshGrant(refreshToken);
  if (!refreshed) {
    // A dead endpoint or a rejected token: nothing to publish, and we do not clobber a good grant.
    throw new Error(`[anthropic-manager] the refresh of ${licence} produced no grant`);
  }
  const grant = grantFromRefresh(refreshed, Date.now());
  if (!grant) {
    throw new Error(`[anthropic-manager] the refresh of ${licence} returned no access token`);
  }

  // Step 3: re-seal the rotated refresh token, if the vendor rotated it. Nothing to store otherwise.
  if (grant.rotatedRefresh) {
    const sealed = seal(new Uint8Array(Buffer.from(grant.rotatedRefresh, "utf8")), nodePub);
    if (process.env.MESH_ANTHROPIC_GRANT_OUT) {
      writeSealedGrant(process.env.MESH_ANTHROPIC_GRANT_OUT, sealed, nodePub);
    }
  }

  // Step 4: the access token in the clear, for the control plane to seal per consumer holder. This is
  // all it ever receives that is not ciphertext.
  atomicWrite(required("MESH_ANTHROPIC_ACCESS_OUT"), grant.access.accessToken);

  console.error(
    `[anthropic-manager] refreshed ${licence}: access token minted` +
      (grant.rotatedRefresh ? ", refresh token rotated and re-sealed" : ", refresh token unchanged"),
  );

  // Step 5: licence-grain usage, best-effort — a usage read failing must not fail the refresh.
  try {
    const usage = await readUsage(grant.access.accessToken);
    if (usage) {
      const reading = flattenUsage(usage);
      if (process.env.MESH_ANTHROPIC_USAGE_OUT) {
        atomicWrite(
          process.env.MESH_ANTHROPIC_USAGE_OUT,
          JSON.stringify({ licence, grain: "licence", ...reading }),
        );
      }
      // Emit ADR-0054 rows, not a vendor-shaped body: the consumer of module.*.usage.* is the
      // vendor-neutral model-usage store, so the normalisation is done HERE. The node names the
      // holding module; with MESH_NODE unset the consumer is the module alone.
      const node = readEnv("MESH_NODE", "");
      const consumer = node ? `${node}/anthropic-manager` : "anthropic-manager";
      await emitUsage({ rows: licenceRows(licence, consumer, reading), raw: usage });
    }
  } catch (err) {
    console.error(`[anthropic-manager] usage poll for ${licence} failed: ${err}`);
  }
}

/**
 * Emit a usage event best-effort by shelling out to the sibling mesh-tools `emit` primitive, which
 * is the one path that wires a broker from a run-once/scheduled step (which itself connects none).
 * A broker hiccup must never fail a refresh that already happened.
 */
async function emitUsage(body: Record<string, unknown>): Promise<void> {
  const main = process.env.MESH_TOOLS_MAIN ?? "/app/dist/main.js";
  const { spawn } = await import("node:child_process");
  await new Promise<void>((resolve) => {
    const child = spawn(process.execPath, [main, "emit", "usage.read", JSON.stringify(body)], {
      stdio: "inherit",
    });
    child.on("exit", () => resolve());
    child.on("error", (err) => {
      console.error(`[anthropic-manager] could not emit usage: ${err}`);
      resolve();
    });
  });
}

await main();