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import type { Extension, HostAPI, Manifest } from "@dispatch/kernel";
import type { SurfaceProvider } from "@dispatch/surface-registry";
import { surfaceRegistryHandle } from "@dispatch/surface-registry";
import { buildLoadedExtensionsSpec } from "./spec.js";

export const manifest: Manifest = {
  id: "surface-loaded-extensions",
  name: "Loaded Extensions Surface",
  version: "0.0.0",
  apiVersion: "^0.1.0",
  trust: "bundled",
  activation: "eager",
  dependsOn: ["surface-registry"],
  contributes: { services: [] },
};

export function createLoadedExtensionsExtension(): Extension {
  let dispose: (() => void) | undefined;

  return {
    manifest,
    activate(host: HostAPI) {
      const registry = host.getService(surfaceRegistryHandle);

      const provider: SurfaceProvider = {
        catalogEntry: {
          id: "loaded-extensions",
          region: "side",
          title: "Loaded Extensions",
          scope: "global",
        },
        getSpec() {
          return buildLoadedExtensionsSpec(host.getExtensions());
        },
        invoke() {},
      };

      dispose = registry.register(provider);
    },
    deactivate() {
      dispose?.();
    },
  };
}