import * as Effect from "effect/Effect";
import * as Binding from "../../Binding.ts";
import * as Output from "../../Output.ts";
import { isBindingHost } from "../Lambda/Function.ts";
import type { Collection } from "./Collection.ts";

/**
 * Shared scaffolding for the OpenSearch Serverless runtime bindings.
 *
 * NOT exported from `index.ts` — every `{Op}Http.ts` in this service is a
 * thin `Layer.effect(Cap, makeAoss…HttpBinding({ … }))` over one of the two
 * builders below. Everything except the operation, the IAM action list, and
 * (for collection-scoped operations) the injected collection `id` is
 * boilerplate.
 */

/**
 * Build the impl Effect for a collection-scoped operation: the runtime
 * callable injects the bound {@link Collection}'s ID as `id` and the
 * deploy-time half grants `actions` on the collection's ARN.
 */
export const makeAossCollectionHttpBinding = <
  I extends { id?: string },
  A,
  E,
  R,
>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.OpenSearchServerless.CreateIndex`. */
  tag: string;
  /** The distilled operation; `id` is injected from the collection. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** IAM actions granted on the collection ARN. */
  actions: readonly string[];
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

    return Effect.fn(function* (collection: Collection) {
      const CollectionId = yield* collection.collectionId;
      if (!globalThis.__ALCHEMY_RUNTIME__) {
        const host = yield* Binding.Host;
        if (isBindingHost(host)) {
          yield* host.bind`Allow(${host}, ${options.tag}(${collection}))`({
            policyStatements: [
              {
                Effect: "Allow",
                Action: [...options.actions],
                Resource: [Output.interpolate`${collection.collectionArn}`],
              },
            ],
          });
        }
      }
      return Effect.fn(`${options.tag}(${collection.LogicalId})`)(function* (
        request: Omit<I, "id">,
      ) {
        return yield* op({
          ...request,
          id: yield* CollectionId,
        } as I);
      });
    });
  });

/**
 * Build the impl Effect for an account-level operation (no collection
 * argument): the deploy-time half grants `actions` on `*` — the account
 * settings, policy stats, and lifecycle-policy read actions do not support
 * resource-level scoping.
 */
export const makeAossAccountHttpBinding = <I, A, E, R>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.OpenSearchServerless.GetAccountSettings`. */
  tag: string;
  /** The distilled operation, invoked with the caller's request as-is. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** IAM actions granted on `*`. */
  actions: readonly string[];
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

    return Effect.fn(function* () {
      if (!globalThis.__ALCHEMY_RUNTIME__) {
        const host = yield* Binding.Host;
        if (isBindingHost(host)) {
          yield* host.bind`Allow(${host}, ${options.tag}())`({
            policyStatements: [
              {
                Effect: "Allow",
                Action: [...options.actions],
                Resource: ["*"],
              },
            ],
          });
        }
      }
      return Effect.fn(options.tag)(function* (request?: I) {
        return yield* op((request ?? {}) as I);
      });
    });
  });