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{ pkgs, ... }:
let
  homeserverUrl = "http://homeserver:8008";

  private_key = pkgs.runCommand "matrix_key.pem" {
    buildInputs = [ pkgs.dendrite ];
  } "generate-keys --private-key $out";
in
{
  name = "dendrite";

  nodes = {
    homeserver =
      { pkgs, ... }:
      {
        services.dendrite = {
          enable = true;
          loadCredential = [ "test_private_key:${private_key}" ];
          openRegistration = true;
          settings = {
            global.server_name = "test-dendrite-server.com";
            global.private_key = "$CREDENTIALS_DIRECTORY/test_private_key";
            client_api.registration_disabled = false;
          };
        };

        networking.firewall.allowedTCPPorts = [ 8008 ];
      };

    client =
      { pkgs, ... }:
      {
        environment.systemPackages = [
          (pkgs.writers.writePython3Bin "do_test" { libraries = [ pkgs.python3Packages.matrix-nio ]; } ''
            import asyncio

            from nio import AsyncClient


            async def main() -> None:
                # Connect to dendrite
                client = AsyncClient("http://homeserver:8008", "alice")

                # Register as user alice
                response = await client.register("alice", "my-secret-password")

                # Log in as user alice
                response = await client.login("my-secret-password")

                # Create a new room
                response = await client.room_create(federate=False)
                room_id = response.room_id

                # Join the room
                response = await client.join(room_id)

                # Send a message to the room
                response = await client.room_send(
                    room_id=room_id,
                    message_type="m.room.message",
                    content={
                        "msgtype": "m.text",
                        "body": "Hello world!"
                    }
                )

                # Sync responses
                response = await client.sync(timeout=30000)

                # Check the message was received by dendrite
                last_message = response.rooms.join[room_id].timeline.events[-1].body
                assert last_message == "Hello world!"

                # Leave the room
                response = await client.room_leave(room_id)

                # Close the client
                await client.close()

            asyncio.get_event_loop().run_until_complete(main())
          '')
        ];
      };
  };

  testScript = ''
    start_all()

    with subtest("start the homeserver"):
        homeserver.wait_for_unit("dendrite.service")
        homeserver.wait_for_open_port(8008)

    with subtest("ensure messages can be exchanged"):
        client.succeed("do_test")
  '';

}