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

/**
 * Shared HTTP scaffolding for the AWS Resource Explorer runtime bindings.
 *
 * NOT exported from `index.ts` — every thin `{Op}Http.ts` in this service
 * is a `Layer.effect(Cap, make…HttpBinding({ … }))` over one of the two
 * builders below. Everything except the operation and the IAM action list
 * is boilerplate.
 */

/**
 * Build the impl Effect for a Resource Explorer operation scoped to a
 * {@link View}: the deploy-time half grants `actions` on the bound view's
 * ARN, and the runtime half injects the view's `ViewArn` into every
 * request.
 */
export const makeResourceExplorerViewHttpBinding = <
  I extends { ViewArn?: string },
  A,
  E,
  R,
>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.ResourceExplorer.Search`. */
  tag: string;
  /** The distilled operation. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** IAM actions granted on the view ARN. */
  actions: readonly string[];
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

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

/**
 * Build the impl Effect for an account-level Resource Explorer operation
 * (e.g. enumerating the searchable resource types). The deploy-time half
 * grants `actions` on `*` — these operations are not scoped to a single
 * Resource Explorer resource.
 */
export const makeResourceExplorerAccountHttpBinding = <I, A, E, R>(options: {
  /**
   * Fully-qualified binding tag, e.g.
   * `AWS.ResourceExplorer.ListSupportedResourceTypes`.
   */
  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);
      });
    });
  });