pub(crate) fn new(

        socket: UnixStream,

        command_channel: mpsc::Receiver<(MpvIpcCommand, oneshot::Sender<MpvIpcResponse>)>,

        event_channel: broadcast::Sender<MpvIpcEvent>,

    ) -> Self {

        MpvIpc {

            socket: Framed::new(socket, LinesCodec::new()),

            command_channel,

            event_channel,

        }

    }

    pub(crate) async fn send_command(

        &mut self,

        command: &[Value],

    ) -> Result<Option<Value>, MpvError> {

        let ipc_command = json!({ "command": command });

        let ipc_command_str =

            serde_json::to_string(&ipc_command).map_err(MpvError::JsonParseError)?;

        log::trace!("Sending command: {}", ipc_command_str);

        self.socket

            .send(ipc_command_str)

            .await

            .map_err(|why| MpvError::MpvSocketConnectionError(why.to_string()))?;

        let response = loop {

            let response = self

                .socket

                .next()

                .await

                .ok_or(MpvError::MpvSocketConnectionError(

                    "Could not receive response from mpv".to_owned(),

                ))?

                .map_err(|why| MpvError::MpvSocketConnectionError(why.to_string()))?;

            let parsed_response =

                serde_json::from_str::<Value>(&response).map_err(MpvError::JsonParseError);

            if parsed_response

                .as_ref()

                .ok()

                .and_then(|v| v.as_object().map(|o| o.contains_key("event")))

                .unwrap_or(false)

                break parsed_response;

        log::trace!("Received response: {:?}", response);

        parse_mpv_response_data(response?, command)

    }

    pub(crate) async fn get_mpv_property(

        &mut self,

        property: &str,

    ) -> Result<Option<Value>, MpvError> {

        self.send_command(&[json!("get_property"), json!(property)])

            .await

    }

    pub(crate) async fn set_mpv_property(

        &mut self,

        property: &str,

        value: Value,

    ) -> Result<Option<Value>, MpvError> {

        self.send_command(&[json!("set_property"), json!(property), value])

            .await

    }

    pub(crate) async fn observe_property(

        &mut self,

        id: u64,

        property: &str,

    ) -> Result<Option<Value>, MpvError> {

        self.send_command(&[json!("observe_property"), json!(id), json!(property)])

            .await

    }

    pub(crate) async fn unobserve_property(&mut self, id: u64) -> Result<Option<Value>, MpvError> {

        self.send_command(&[json!("unobserve_property"), json!(id)])

            .await

    }

    async fn handle_event(&mut self, event: Result<Value, MpvError>) {

        match &event {

            Ok(event) => {

                log::trace!("Parsed event: {:?}", event);

                    self.event_channel.send(MpvIpcEvent(event.to_owned()))

                }

    }

    pub(crate) async fn run(mut self) -> Result<(), MpvError> {

            tokio::select! {

              Some(event) = self.socket.next() => {

                log::trace!("Got event: {:?}", event);

                let parsed_event = event

                    .map_err(|why| MpvError::MpvSocketConnectionError(why.to_string()))

                    .and_then(|event|

                        serde_json::from_str::<Value>(&event)

                        .map_err(MpvError::JsonParseError));

                self.handle_event(parsed_event).await;

              Some((cmd, tx)) = self.command_channel.recv() => {

                  log::trace!("Handling command: {:?}", cmd);

                  match cmd {

                      MpvIpcCommand::Command(command) => {

                          let refs = command.iter().map(|s| json!(s)).collect::<Vec<Value>>();

                          let response = self.send_command(refs.as_slice()).await;

                          tx.send(MpvIpcResponse(response)).unwrap()

                      MpvIpcCommand::GetProperty(property) => {

                          let response = self.get_mpv_property(&property).await;

                          tx.send(MpvIpcResponse(response)).unwrap()

                      MpvIpcCommand::SetProperty(property, value) => {

                          let response = self.set_mpv_property(&property, value).await;

                          tx.send(MpvIpcResponse(response)).unwrap()

                      MpvIpcCommand::ObserveProperty(id, property) => {

                          let response = self.observe_property(id, &property).await;

                          tx.send(MpvIpcResponse(response)).unwrap()

                      MpvIpcCommand::UnobserveProperty(id) => {

                          let response = self.unobserve_property(id).await;

                          tx.send(MpvIpcResponse(response)).unwrap()

fn parse_mpv_response_data(value: Value, command: &[Value]) -> Result<Option<Value>, MpvError> {

    log::trace!("Parsing mpv response data: {:?}", value);

    let result = value

        .as_object()

        .ok_or(MpvError::ValueContainsUnexpectedType {

            expected_type: "object".to_string(),

            received: value.clone(),

        })

        .and_then(|o| {

            let error = o

                .get("error")

                .ok_or(MpvError::MissingKeyInObject {

                    key: "error".to_string(),

                    map: o.clone(),

                })?

                .as_str()

                .ok_or(MpvError::ValueContainsUnexpectedType {

                    expected_type: "string".to_string(),

                    received: o.get("error").unwrap().clone(),

                })?;

            let data = o.get("data");

            Ok((error, data))

        })

        .and_then(|(error, data)| match error {

            "success" => Ok(data),

            "property unavailable" => Ok(None),

            err => Err(MpvError::MpvError {

                command: command.to_owned(),

                message: err.to_string(),

            }),

        });

    match &result {

        Ok(v) => log::trace!("Successfully parsed mpv response data: {:?}", v),

        Err(e) => log::trace!("Error parsing mpv response data: {:?}", e),

    result.map(|opt| opt.cloned())

}