// model-usage's tools — its own read-only query surface over the usage store (novox/hq ADR 0039:
// the tools and the client they call live in the module). The store is opened from the environment;
// when it cannot be (no DATABASE_URL), the module contributes no tools rather than failing the whole
// tool runtime — the postgres precedent.

import { registerModuleTools, type ToolDefinition } from "@novox/mesh-sdk/tools";
import { UsageStore } from "../store.js";

export function getUsageTools(store: UsageStore): ToolDefinition[] {
  return [
    {
      name: "model_usage_current",
      description:
        "The latest model-usage reading per (licence, consumer, period, metric), across both grains, optionally restricted to one licence.",
      input: {
        licence: { type: "string", description: "restrict to one licence (optional)" },
      },
      run: async (args) => {
        const licence = args.licence ? String(args.licence) : undefined;
        return { usage: await store.current(licence) };
      },
    },
  ];
}

registerModuleTools("model-usage", (env) => {
  try {
    return getUsageTools(UsageStore.fromEnv(env));
  } catch {
    return [];
  }
});