import { getMatrixRuntime } from "../../runtime.js";
import type { CoreConfig } from "../types.js";
import { getActiveMatrixClient } from "../active-client.js";
import {
  createMatrixClient,
  isBunRuntime,
  resolveMatrixAuth,
  resolveSharedMatrixClient,
} from "../client.js";
import type { MatrixActionClient, MatrixActionClientOpts } from "./types.js";

export function ensureNodeRuntime() {
  if (isBunRuntime()) {
    throw new Error("Matrix support requires Node (bun runtime not supported)");
  }
}

export async function resolveActionClient(
  opts: MatrixActionClientOpts = {},
): Promise<MatrixActionClient> {
  ensureNodeRuntime();
  if (opts.client) return { client: opts.client, stopOnDone: false };
  const active = getActiveMatrixClient();
  if (active) return { client: active, stopOnDone: false };
  const shouldShareClient = Boolean(process.env.CLAWDBOT_GATEWAY_PORT);
  if (shouldShareClient) {
    const client = await resolveSharedMatrixClient({
      cfg: getMatrixRuntime().config.loadConfig() as CoreConfig,
      timeoutMs: opts.timeoutMs,
    });
    return { client, stopOnDone: false };
  }
  const auth = await resolveMatrixAuth({
    cfg: getMatrixRuntime().config.loadConfig() as CoreConfig,
  });
  const client = await createMatrixClient({
    homeserver: auth.homeserver,
    userId: auth.userId,
    accessToken: auth.accessToken,
    encryption: auth.encryption,
    localTimeoutMs: opts.timeoutMs,
  });
  if (auth.encryption && client.crypto) {
    try {
      const joinedRooms = await client.getJoinedRooms();
      await client.crypto.prepare(joinedRooms);
    } catch {
      // Ignore crypto prep failures for one-off actions.
    }
  }
  await client.start();
  return { client, stopOnDone: true };
}
