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

/**
 * Shared scaffolding for Amazon Data Lifecycle Manager (DLM) 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 a DLM operation scoped to a
 * {@link LifecyclePolicy}: the deploy-time half grants `actions` on the bound
 * policy's ARN, and the runtime half injects the policy's `PolicyId` into
 * every request.
 */
export const makeDlmPolicyHttpBinding = <
  I extends { PolicyId: string },
  A,
  E,
  R,
>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.DLM.GetLifecyclePolicy`. */
  tag: string;
  /** The distilled operation. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** IAM actions granted on the lifecycle policy ARN. */
  actions: readonly string[];
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

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

/**
 * Build the impl Effect for an account-level DLM operation (enumerating the
 * account's lifecycle policies). The deploy-time half grants `actions` on
 * `*` — `dlm:GetLifecyclePolicies` is a list action that is not scoped to a
 * single policy resource.
 */
export const makeDlmAccountHttpBinding = <I, A, E, R>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.DLM.GetLifecyclePolicies`. */
  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);
      });
    });
  });