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

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

/**
 * Build the impl Effect for an IoT SiteWise operation scoped to one
 * {@link Asset}: the deploy-time half grants `iamActions` on the bound
 * asset's ARN, and the runtime half injects the asset's service-assigned id
 * into every request via `prepare`.
 *
 * Note: requests that identify the target data stream by `propertyAlias`
 * instead of `assetId`/`propertyId` authorize against the time-series
 * resource, which this asset-scoped grant does not cover.
 */
export const makeSiteWiseAssetHttpBinding = <I, A, E, R, Req>(options: {
  /**
   * Short capability name used in the binding sid and runtime span, e.g.
   * `"GetAssetPropertyValue"`.
   */
  capability: string;
  /** IAM actions granted on the bound asset's ARN. */
  iamActions: readonly string[];
  /** The distilled operation implementing the capability. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** Map the public request shape + bound asset id onto the wire request. */
  prepare: (request: Req, assetId: string) => I;
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

    return Effect.fn(function* (asset: Asset) {
      // Output yields a DEFERRED effect — resolve again per invocation below.
      const AssetId = yield* asset.assetId;
      if (!globalThis.__ALCHEMY_RUNTIME__) {
        const host = yield* Binding.Host;
        if (isBindingHost(host)) {
          yield* host.bind`Allow(${host}, AWS.IoTSiteWise.${options.capability}(${asset}))`(
            {
              policyStatements: [
                {
                  Effect: "Allow",
                  Action: [...options.iamActions],
                  Resource: [asset.assetArn],
                },
              ],
            },
          );
        }
      }
      return Effect.fn(
        `AWS.IoTSiteWise.${options.capability}(${asset.LogicalId})`,
      )(function* (request: Req) {
        const assetId = yield* AssetId;
        return yield* op(options.prepare(request, assetId));
      });
    });
  });

/**
 * Build the impl Effect for an account-level IoT SiteWise operation (e.g.
 * `ExecuteQuery`, which queries across all asset models and assets and is
 * not scoped to a single resource). Grants `iamActions` on
 * `Resource: ["*"]`.
 */
export const makeSiteWiseAccountHttpBinding = <I, A, E, R>(options: {
  /** Short capability name used in the binding sid and runtime span. */
  capability: string;
  /** IAM actions granted on `Resource: ["*"]`. */
  iamActions: readonly string[];
  /** The distilled operation implementing the capability. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
}) =>
  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(${host}, AWS.IoTSiteWise.${options.capability}())`(
            {
              policyStatements: [
                {
                  Effect: "Allow",
                  Action: [...options.iamActions],
                  Resource: ["*"],
                },
              ],
            },
          );
        }
      }
      return Effect.fn(`AWS.IoTSiteWise.${options.capability}`)(function* (
        request: I,
      ) {
        return yield* op(request);
      });
    });
  });