// home-assistant's tools — its own code (novox/hq ADR 0039), importing its own client. They return
// structured data; the mesh serves them through the sdk's tool harness.

import { registerModuleTools, type ToolDefinition } from "@novox/mesh-sdk/tools";
import { HomeAssistantClient, type HAEntityState } from "../client.js";

/** Trim an entity to the fields worth returning — the full attribute bag is large and mostly noise. */
function summarize(s: HAEntityState): { entity_id: string; state: string; name?: string; last_changed?: string } {
  return {
    entity_id: s.entity_id,
    state: s.state,
    name: typeof s.attributes.friendly_name === "string" ? s.attributes.friendly_name : undefined,
    last_changed: s.last_changed,
  };
}

export function getHomeAssistantTools(ha: HomeAssistantClient): ToolDefinition[] {
  return [
    {
      name: "homeassistant_states",
      description:
        "Entity states from Home Assistant. With no argument, lists every entity; with `entity` (e.g. light.kitchen), returns just that one with its full attributes.",
      input: { entity: { type: "string", description: "an entity id to fetch one entity; omitted lists all" } },
      run: async (args) => {
        if (args.entity) {
          const s = await ha.getState(String(args.entity));
          return { entity_id: s.entity_id, state: s.state, attributes: s.attributes, last_changed: s.last_changed };
        }
        const states = await ha.getStates();
        return { count: states.length, entities: states.map(summarize) };
      },
    },
    {
      name: "homeassistant_call_service",
      description:
        "Call a Home Assistant service — turn a switch/light on or off, lock a door, etc. Give the domain (e.g. switch), the service (e.g. turn_on), and optionally a target entity and extra data.",
      input: {
        domain: { type: "string", description: "the service domain, e.g. light, switch, lock" },
        service: { type: "string", description: "the service, e.g. turn_on, turn_off, toggle" },
        entity: { type: "string", description: "the entity id to target (optional)" },
        data: { type: "object", description: "extra service data merged into the call (optional)" },
      },
      run: async (args) => {
        const data: Record<string, unknown> = { ...(args.data as Record<string, unknown> | undefined) };
        if (args.entity) data.entity_id = String(args.entity);
        const changed = await ha.callService(String(args.domain), String(args.service), data);
        return { changed: changed.map(summarize) };
      },
    },
    {
      name: "homeassistant_config",
      description: "Home Assistant instance config: version, location, timezone, loaded components.",
      input: {},
      run: async () => {
        const c = await ha.getConfig();
        return {
          location: c.location_name,
          version: c.version,
          time_zone: c.time_zone,
          state: c.state,
          components: c.components?.length ?? 0,
        };
      },
    },
  ];
}

// The tools exist only when a token is configured; without one, home-assistant contributes none
// rather than failing the whole runtime.
registerModuleTools("home-assistant", (env) => {
  try {
    return getHomeAssistantTools(HomeAssistantClient.fromEnv(env));
  } catch {
    return [];
  }
});