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

/**
 * Shared scaffolding for Audit Manager HTTP 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 two
 * builders below. Everything except the operation, the IAM action list, and
 * (for assessment-scoped operations) the injected `assessmentId` is
 * boilerplate.
 */

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

    return Effect.fn(function* (assessment: Assessment) {
      const AssessmentId = yield* assessment.assessmentId;
      if (!globalThis.__ALCHEMY_RUNTIME__) {
        const host = yield* Binding.Host;
        if (isBindingHost(host)) {
          yield* host.bind`Allow(${host}, ${options.tag}(${assessment}))`({
            policyStatements: [
              {
                Effect: "Allow",
                Action: [...options.actions],
                Resource: [Output.interpolate`${assessment.arn}`],
              },
            ],
          });
        }
      }
      return Effect.fn(`${options.tag}(${assessment.LogicalId})`)(function* (
        request?: Omit<I, "assessmentId">,
      ) {
        return yield* op({
          ...request,
          assessmentId: yield* AssessmentId,
        } as I);
      });
    });
  });

/**
 * Build the impl Effect for an account-level operation (no target assessment
 * — registration status, account-wide insights, report listings, presigned
 * evidence-upload URLs). The deploy-time half grants `actions` on `*`
 * because these IAM actions do not support resource-level scoping.
 */
export const makeAuditManagerAccountHttpBinding = <I, A, E, R>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.AuditManager.GetInsights`. */
  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);
      });
    });
  });