import * as Effect from "effect/Effect";
import * as Binding from "../../Binding.ts";
import type { PolicyStatement } from "../IAM/Policy.ts";
import { isBindingHost } from "../Lambda/Function.ts";
import type { Group } from "./Group.ts";

/**
 * Shared scaffolding for the AWS Resource Groups 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, the IAM action list, and (for
 * group-scoped operations) the injected group identifier is boilerplate.
 */

/**
 * Build the impl Effect for a Resource Groups operation scoped to a
 * {@link Group}: the deploy-time half grants `actions` on the bound group's
 * ARN (plus any `supportingActions` on `*` — e.g. the Resource Groups
 * Tagging API / CloudFormation read-through permissions that member
 * enumeration fans out to), and the runtime half injects the group's name
 * into every request as `Group`.
 */
export const makeResourceGroupsGroupHttpBinding = <
  I extends { Group?: string },
  A,
  E,
  R,
>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.ResourceGroups.GroupResources`. */
  tag: string;
  /** The distilled operation. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** IAM actions granted on the group ARN. */
  actions: readonly string[];
  /**
   * IAM actions granted on `*` that the operation fans out to — member
   * resources are arbitrary ARNs unknowable at deploy time (e.g.
   * `tag:GetResources` for `ListGroupResources`).
   */
  supportingActions?: readonly string[];
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

    return Effect.fn(function* (group: Group) {
      const GroupName = yield* group.groupName;
      if (!globalThis.__ALCHEMY_RUNTIME__) {
        const host = yield* Binding.Host;
        if (isBindingHost(host)) {
          const supporting: PolicyStatement[] =
            options.supportingActions !== undefined
              ? [
                  {
                    Effect: "Allow",
                    Action: [...options.supportingActions],
                    // Member resources are arbitrary ARNs chosen per request.
                    Resource: ["*"],
                  },
                ]
              : [];
          yield* host.bind`Allow(${host}, ${options.tag}(${group}))`({
            policyStatements: [
              {
                Effect: "Allow",
                Action: [...options.actions],
                Resource: [group.groupArn],
              },
              ...supporting,
            ],
          });
        }
      }
      return Effect.fn(`${options.tag}(${group.LogicalId})`)(function* (
        request?: Omit<I, "Group" | "GroupName">,
      ) {
        const groupName = yield* GroupName;
        return yield* op({ ...request, Group: groupName } as I);
      });
    });
  });

/**
 * Build the impl Effect for an account-level Resource Groups operation
 * (search, account settings, tag-sync task audit). The deploy-time half
 * grants `actions` on `*` — the targets (queries, task ARNs) are chosen per
 * request at runtime and unknowable at deploy time.
 */
export const makeResourceGroupsAccountHttpBinding = <I, A, E, R>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.ResourceGroups.SearchResources`. */
  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);
      });
    });
  });