someip 0.1.1

/*
    Copyright 2021 Sojan James
    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.
*/

use core::panic;
use std::sync::{Arc, LockResult, RwLock, RwLockReadGuard};

use bincode::{deserialize, serialize};
use bytes::Bytes;
use serde::{de::DeserializeOwned, Serialize};
use someip_parse::{MessageType, SomeIpHeader};

use crate::error::PropertyError;
use crate::{Client, SomeIpPacket};
#[derive(Clone)]
pub struct Field<T> {
    val: Arc<RwLock<Option<T>>>,
    client: Client,
    field_id: u16,
    service_id: u16,
}

impl<T> Field<T>
where
    T: Default + Serialize + DeserializeOwned,
{
    pub fn new(_val: T, client: Client, field_id: u16, service_id: u16) -> Self {
        Self {
            val: Arc::new(RwLock::new(None)),
            client,
            field_id,
            service_id,
        }
    }

    pub fn get_cached(&self) -> LockResult<RwLockReadGuard<'_, Option<T>>> {
        self.val.read()
    }

    pub fn set_cached(&self, val: T) {
        let mut writable = self.val.write().unwrap();
        *writable = Some(val);
    }

    pub async fn set(&mut self, val: T) -> Result<(), PropertyError> {
        self.set_with_timeout(val, std::time::Duration::from_secs(1))
            .await
    }

    pub async fn set_with_timeout(
        &mut self,
        val: T,
        timeout: std::time::Duration,
    ) -> Result<(), PropertyError> {
        let mut header = SomeIpHeader::default();
        header.set_event_id(self.field_id);
        header.message_type = MessageType::Request;
        header.set_service_id(self.service_id);
        let payload_raw = serialize(&val).unwrap();
        let packet = SomeIpPacket::new(header, Bytes::from(payload_raw));
        let res = self.client.call(packet, timeout).await;
        self.set_cached(val);

        match res {
            Ok(reply_data) => match reply_data {
                crate::ReplyData::Pending => {
                    panic!("Unexpected pending reply. Should be completed or cancelled")
                }
                crate::ReplyData::Completed(_) => Ok(()),
                crate::ReplyData::Cancelled => Err(PropertyError::Cancelled),
            },
            Err(_e) => Err(PropertyError::ConnectionError),
        }
    }

    pub async fn refresh(&mut self) -> Result<(), PropertyError> {
        self.refresh_with_timeout(std::time::Duration::from_secs(1))
            .await
    }

    pub async fn refresh_with_timeout(
        &mut self,
        timeout: std::time::Duration,
    ) -> Result<(), PropertyError> {
        let mut header = SomeIpHeader::default();
        header.set_event_id(self.field_id);
        header.message_type = MessageType::Request;
        header.set_service_id(self.service_id);
        let packet = SomeIpPacket::new(header, Bytes::new());
        if let Ok(reply) = self.client.call(packet, timeout).await {
            match reply {
                crate::ReplyData::Completed(packet) => {
                    let payload: T = deserialize(packet.payload()).unwrap();
                    self.set_cached(payload);
                    Ok(())
                }
                crate::ReplyData::Cancelled => todo!(),
                _ => Err(PropertyError::Cancelled),
            }
        } else {
            Err(PropertyError::ConnectionError)
        }
    }
}