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 { ImagePipeline } from "./ImagePipeline.ts";

/**
 * Shared scaffolding for the EC2 Image Builder HTTP 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 an Image Builder operation scoped to a bound
 * {@link ImagePipeline}: the runtime callable injects the pipeline's ARN as
 * `imagePipelineArn` and the deploy-time half grants `actions` on the
 * pipeline's ARN.
 *
 * `clientToken` (an idempotency token) is auto-generated by distilled when
 * absent, so it is omitted from the runtime request shape.
 */
export const makeImageBuilderPipelineHttpBinding = <
  I extends { imagePipelineArn?: string },
  A,
  E,
  R,
>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.ImageBuilder.GetImagePipeline`. */
  tag: string;
  /** The distilled operation; `imagePipelineArn` is injected. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** IAM actions granted on the pipeline ARN. */
  actions: readonly string[];
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

    return Effect.fn(function* (pipeline: ImagePipeline) {
      // Outputs yield a DEFERRED effect — resolve again per invocation below.
      const PipelineArn = yield* pipeline.imagePipelineArn;
      if (!globalThis.__ALCHEMY_RUNTIME__) {
        const host = yield* Binding.Host;
        if (isBindingHost(host)) {
          yield* host.bind`Allow(${host}, ${options.tag}(${pipeline}))`({
            policyStatements: [
              {
                Effect: "Allow",
                Action: [...options.actions],
                Resource: [Output.interpolate`${pipeline.imagePipelineArn}`],
              },
            ],
          });
        }
      }
      return Effect.fn(`${options.tag}(${pipeline.LogicalId})`)(function* (
        request?: Omit<I, "imagePipelineArn" | "clientToken">,
      ) {
        return yield* op({
          ...request,
          imagePipelineArn: yield* PipelineArn,
        } as I);
      });
    });
  });

/**
 * Build the impl Effect for an account-level Image Builder operation (image
 * build-version reads and control, account image listings). Image build
 * versions are created dynamically by pipeline runs — their ARNs are not
 * known at deploy time — so the deploy-time half grants `actions` on `*` and
 * the runtime callable passes the caller's request through as-is.
 */
export const makeImageBuilderAccountHttpBinding = <I, A, E, R>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.ImageBuilder.GetImage`. */
  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?: Omit<I, "clientToken">,
      ) {
        return yield* op((request ?? {}) as I);
      });
    });
  });