// Copyright 2020-2023 Nym Technologies SA
//
// 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.

const RUST_WASM_URL = "nym_client_wasm_bg.wasm";

importScripts("nym_client_wasm.js");

console.log("Initializing worker");

// wasm_bindgen creates a global variable (with the exports attached) that is in scope after `importScripts`
const {
  default_debug,
  no_cover_debug,
  NymClientBuilder,
  NymClient,
  set_panic_hook,
  ClientConfig,
  GatewayEndpointConfig,
  current_network_topology,
} = wasm_bindgen;

let client = null;

function printAndDisplayTestResult(result) {
  result.log_details();

  self.postMessage({
    kind: "DisplayTesterResults",
    args: {
      score: result.score(),
      sentPackets: result.sent_packets,
      receivedPackets: result.received_packets,
      receivedAcks: result.received_acks,
      duplicatePackets: result.duplicate_packets,
      duplicateAcks: result.duplicate_acks,
    },
  });
}

async function wasm_bindgenSetup(onMessageHandler) {
  // const preferredGateway = "6qQYb4ArXANU6HJDxzH4PFCUqYb39Dae2Gem2KpxescM";
  // const validator = "https://qa-nym-api.qa.nymte.ch/api";

  // STEP 1. construct config
  // those are just some examples, there are obviously more permutations;
  // note, the extra optional argument is of the following type:
  // /*
  // export interface ClientConfigOpts {
  //     id?: string;
  //     nymApi?: string;
  //     nyxd?: string;
  //     debug?: DebugWasm;
  // }
  //  */
  //
  // const debug = no_cover_debug()
  //
  // #1
  // const config = new ClientConfig({ id: 'my-awesome-client', nymApi: validator, debug: debug} );
  // #2
  // const config = new ClientConfig({ nymApi: validator, debug: debug} );
  // #3
  // const config = new ClientConfig({ id: 'my-awesome-client' } );
  //
  // #4
  const differentDebug = default_debug();
  const updatedTraffic = differentDebug.traffic;
  updatedTraffic.use_extended_packet_size = true;
  updatedTraffic.average_packet_delay_ms = 666;
  differentDebug.traffic = updatedTraffic;

  const config = new ClientConfig({ debug: differentDebug });
  //
  // // STEP 2. setup the client
  // // note, the extra optional argument is of the following type:
  // /*
  //     export interface MixFetchOptsSimple {
  //         preferredGateway?: string;
  //         storagePassphrase?: string;
  //     }
  //  */
  // #1
  // return await NymClient.newWithConfig(config, onMessageHandler)
  //
  // #2
  return await NymClient.newWithConfig(config, onMessageHandler, {
    storagePassphrase: "foomp",
  });
  //
  // #3
  // return await NymClient.newWithConfig(config, onMessageHandler, { storagePassphrase: "foomp", preferredGateway })
}

async function nativeSetup(onMessageHandler) {
  const validator = "https://validator.nymtech.net/api";

  // those are just some examples, there are obviously more permutations;
  // note, the extra optional argument is of the following type:
  /*
        export interface ClientOpts extends ClientOptsSimple {
            clientId?: string;
            nymApiUrl?: string;
            nyxdUrl?: string;
            clientOverride?: DebugWasmOverride;
        }

    	where `DebugWasmOverride` is a rather nested struct that you can look up yourself : )
     */

  // #1
  // return new NymClient(onMessageHandler)
  // #2
  // return new NymClient(onMessageHandler, { nymApiUrl: validator })
  // #3
  const noCoverTrafficOverride = {
    traffic: { disableMainPoissonPacketDistribution: true },
    coverTraffic: { disableLoopCoverTrafficStream: true },
  };

  console.log("before return");

  return new NymClient(onMessageHandler, {
    // storagePassphrase: "foomp",
    nymApiUrl: validator,
    // clientId: "my-client",
    clientOverride: noCoverTrafficOverride,
  });
}

async function normalNymClientUsage() {
  // self.postMessage({ kind: "DisableMagicTestButton" });

  const onMessageHandler = (message) => {
    console.log(">>>>> RECEIVED", message);
    self.postMessage({
      kind: "ReceiveMessage",
      args: {
        message,
      },
    });
  };

  console.log("Instantiating WASM client...");

  const validator = "https://validator.nymtech.net/api";

  const config = new ClientConfig({
    nymApiUrl: validator,
  });

  let localClient;
  try {
    localClient = await NymClient.newWithConfig(config, onMessageHandler, {});
  } catch (e) {
    console.log("local client creation error: ", e);
    throw e;
  }

  console.log(">>>>>>>>>>>> WASM client running!");
  const selfAddress = localClient.selfAddress();
  client = localClient;

  console.log(`Client address is ${selfAddress}`);
  self.postMessage({
    kind: "Ready",
    args: {
      selfAddress,
    },
  });

  self.onmessage = async (event) => {
    console.log(event);
    if (event.data && event.data.kind) {
      switch (event.data.kind) {
        case "SendMessage": {
          const { message, recipient } = event.data.args;
          let uint8Array = new TextEncoder().encode(message);
          await client.send_regular_message(uint8Array, recipient);
          break;
        }
      }
    }
  };
}

async function main() {
  console.log(">>>>>>>>>>>>>>>>>>>>> JS WORKER MAIN START");

  // load rust WASM package
  await wasm_bindgen(RUST_WASM_URL);
  console.log("Loaded RUST WASM");

  // sets up better stack traces in case of in-rust panics
  set_panic_hook();
  //
  // hook-up the whole client for testing (not recommended)
  // await testWithNymClient()
  //
  // 'Normal' client setup (to send 'normal' messages)
  await normalNymClientUsage();

  console.log(">>>>>>>>>>>>>>>>>>>>> JS WORKER MAIN END");
}

// Let's get started!
main();