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 { Table } from "./Table.ts";
import type { TableBucket } from "./TableBucket.ts";

/**
 * Shared scaffolding for the S3 Tables runtime bindings.
 *
 * NOT exported from `index.ts` — every `{Op}Http.ts` in this service is a
 * thin `Layer.effect(Cap, makeS3Tables…HttpBinding({ … }))` over one of the
 * two builders below. Everything except the operation, the IAM action list,
 * and the injected identifiers is boilerplate.
 */

/**
 * Build the impl Effect for a table-bucket-scoped S3 Tables operation: the
 * runtime callable injects the bound {@link TableBucket}'s ARN as
 * `tableBucketARN` and the deploy-time half grants `actions` on the bucket
 * ARN (and everything under it, for operations like `ListTables` whose IAM
 * resource is the namespace/table).
 */
export const makeS3TablesTableBucketHttpBinding = <
  I extends { tableBucketARN?: string },
  A,
  E,
  R,
>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.S3Tables.ListNamespaces`. */
  tag: string;
  /** The distilled operation; `tableBucketARN` is injected from the bucket. */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** IAM actions granted on the bucket ARN and its children. */
  actions: readonly string[];
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

    return Effect.fn(function* (tableBucket: TableBucket) {
      const tableBucketARN = yield* tableBucket.tableBucketArn;
      if (!globalThis.__ALCHEMY_RUNTIME__) {
        const host = yield* Binding.Host;
        if (isBindingHost(host)) {
          yield* host.bind`Allow(${host}, ${options.tag}(${tableBucket}))`({
            policyStatements: [
              {
                Effect: "Allow",
                Action: [...options.actions],
                Resource: [
                  Output.interpolate`${tableBucket.tableBucketArn}`,
                  // List operations authorize against the namespaces/tables
                  // under the bucket, e.g. `…:bucket/name/table/*`.
                  Output.interpolate`${tableBucket.tableBucketArn}/*`,
                ],
              },
            ],
          });
        }
      }
      return Effect.fn(`${options.tag}(${tableBucket.LogicalId})`)(function* (
        request?: Omit<I, "tableBucketARN">,
      ) {
        return yield* op({
          ...request,
          tableBucketARN: yield* tableBucketARN,
        } as I);
      });
    });
  });

/**
 * Build the impl Effect for a table-scoped S3 Tables operation: the runtime
 * callable injects the bound {@link Table}'s `tableBucketARN`, `namespace`,
 * and `name`, and the deploy-time half grants `actions` on the table's ARN.
 */
export const makeS3TablesTableHttpBinding = <
  I extends { tableBucketARN?: string; namespace?: string; name?: string },
  A,
  E,
  R,
>(options: {
  /** Fully-qualified binding tag, e.g. `AWS.S3Tables.GetTableMetadataLocation`. */
  tag: string;
  /**
   * The distilled operation; `tableBucketARN`, `namespace`, and `name` are
   * injected from the table.
   */
  operation: Effect.Effect<(input: I) => Effect.Effect<A, E>, never, R>;
  /** IAM actions granted on the table ARN. */
  actions: readonly string[];
}) =>
  Effect.gen(function* () {
    const op = yield* options.operation;

    return Effect.fn(function* (table: Table) {
      const tableBucketARN = yield* table.tableBucketArn;
      const namespace = yield* table.namespace;
      const name = yield* table.name;
      if (!globalThis.__ALCHEMY_RUNTIME__) {
        const host = yield* Binding.Host;
        if (isBindingHost(host)) {
          yield* host.bind`Allow(${host}, ${options.tag}(${table}))`({
            policyStatements: [
              {
                Effect: "Allow",
                Action: [...options.actions],
                Resource: [Output.interpolate`${table.tableArn}`],
              },
            ],
          });
        }
      }
      return Effect.fn(`${options.tag}(${table.LogicalId})`)(function* (
        request?: Omit<I, "tableBucketARN" | "namespace" | "name">,
      ) {
        return yield* op({
          ...request,
          tableBucketARN: yield* tableBucketARN,
          namespace: yield* namespace,
          name: yield* name,
        } as I);
      });
    });
  });