// Copyright 2021-2023 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import type { Interceptor, Transport } from "@apachedubbo/dubbo";
import type { Compression } from "@apachedubbo/dubbo/protocol";
import { createTransport } from "@apachedubbo/dubbo/protocol-grpc";
import type {
  BinaryReadOptions,
  BinaryWriteOptions,
  JsonReadOptions,
  JsonWriteOptions,
} from "@bufbuild/protobuf";
import {
  type DeprecatedNodeTransportOptions,
  type NodeTransportOptions,
  validateNodeTransportOptions,
} from "./node-transport-options.js";

/**
 * Options used to configure the gRPC-web transport.
 *
 * See createGrpcTransport().
 */
type GrpcTransportOptions = NodeTransportOptions &
  DeprecatedNodeTransportOptions & {
    /**
     * Base URI for all HTTP requests.
     *
     * Requests will be made to <baseUrl>/<package>.<service>/method
     *
     * Example: `baseUrl: "https://example.com/my-api"`
     *
     * This will make a `POST /my-api/my_package.MyService/Foo` to
     * `example.com` via HTTPS.
     */
    baseUrl: string;

    /**
     * By default, clients use the binary format for gRPC-web, because
     * not all gRPC-web implementations support JSON.
     */
    useBinaryFormat?: boolean;

    /**
     * Interceptors that should be applied to all calls running through
     * this transport. See the Interceptor type for details.
     */
    interceptors?: Interceptor[];

    /**
     * Options for the JSON format.
     * By default, unknown fields are ignored.
     */
    jsonOptions?: Partial<JsonReadOptions & JsonWriteOptions>;

    /**
     * Options for the binary wire format.
     */
    binaryOptions?: Partial<BinaryReadOptions & BinaryWriteOptions>;

    /**
     * Compression algorithms available to a client. Clients ask servers to
     * compress responses using any of the registered algorithms. The first
     * registered algorithm is the most preferred.
     *
     * It is safe to use this option liberally: servers will ignore any
     * compression algorithms they don't support. To compress requests, pair this
     * option with `sendCompression`.
     *
     * If this option is not provided, the compression algorithms "gzip" and "br"
     * (Brotli) are accepted. To opt out of response compression, pass an
     * empty array.
     */
    acceptCompression?: Compression[];

    /**
     * Configures the client to use the specified algorithm to compress request
     * messages.
     *
     * Because some servers don't support compression, clients default to sending
     * uncompressed requests.
     */
    sendCompression?: Compression;

    /**
     * Sets a minimum size threshold for compression: Messages that are smaller
     * than the configured minimum are sent uncompressed.
     *
     * The default value is 1 kibibyte, because the CPU cost of compressing very
     * small messages usually isn't worth the small reduction in network I/O.
     */
    compressMinBytes?: number;

    /**
     * Limits the performance impact of pathologically large messages sent by the
     * server. Limits apply to each individual message, not to the stream as a
     * whole.
     *
     * The default limit is the maximum supported value of ~4GiB.
     */
    readMaxBytes?: number;

    /**
     * Prevents sending messages too large for the server to handle.
     *
     * The default limit is the maximum supported value of ~4GiB.
     */
    writeMaxBytes?: number;
  };

/**
 * Create a Transport for the gRPC protocol using the Node.js `http`, `http2`,
 * or `http2` module.
 */
export function createGrpcTransport(options: GrpcTransportOptions): Transport {
  return createTransport(validateNodeTransportOptions(options));
}
