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import type { Url, UrlString } from "../../interfaces";
import type { WithAccessibleAcr } from "../acp";
import { ACP } from "../constants";
import { buildThing } from "../../thing/build";
import { getDefaultAccessControlThing } from "../internal/getDefaultAccessControlThing";
import { DEFAULT_ACCESS_CONTROL } from "../internal/getDefaultAccessControlUrl";
import { setAccessControlResourceThing } from "../internal/setAccessControlResourceThing";
import { setDefaultAccessControlThingIfNotExist } from "../internal/setDefaultAccessControlThingIfNotExist";

/**
 * ```{note}
 * The ACP specification is a draft. As such, this function is experimental and
 * subject to change, even in a non-major release.
 * See also: https://solid.github.io/authorization-panel/acp-specification/
 * ```
 *
 * Add a policy applying to the given resource.
 *
 * @param resourceWithAcr The resource for which to add the URL of a policy
 * applying to it.
 * @param policyUrl A Policy URL.
 * @returns The resource with its ammended access control resource.
 * @since 1.16.1
 */
export function addPolicyUrl<T extends WithAccessibleAcr>(
  resourceWithAcr: T,
  policyUrl: Url | UrlString,
): T {
  const resourceWithAcrContainingDefaultAccessControl =
    setDefaultAccessControlThingIfNotExist(
      resourceWithAcr,
      DEFAULT_ACCESS_CONTROL,
    );

  const defaultAccessControlThing = getDefaultAccessControlThing(
    resourceWithAcrContainingDefaultAccessControl,
    DEFAULT_ACCESS_CONTROL,
  );

  return setAccessControlResourceThing(
    resourceWithAcrContainingDefaultAccessControl,
    buildThing(defaultAccessControlThing).addUrl(ACP.apply, policyUrl).build(),
  );
}