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/*
 * Copyright (C) 2018 Kubos Corporation
 *
 * 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 radio_api::{Connection, RadioResult, Stream};
use serial;
use std::io;
use std::time::Duration;

/// Connection for communicating with actual
/// Duplex-D2 hardware
pub fn serial_connection() -> Connection {
    Connection::new(Box::new(SerialStream {}))
}

struct SerialStream {}

impl Stream for SerialStream {
    fn write(&self, data: &[u8]) -> RadioResult<()> {
        serial_send(data)?;
        Ok(())
    }
    fn read(&self) -> RadioResult<Vec<u8>> {
        Ok(serial_receive()?)
    }
}

fn serial_send(data: &[u8]) -> io::Result<()> {
    use serial::prelude::*;
    use std::io::prelude::*;

    let mut port = serial::open("/dev/ttyUSB0")?;
    let settings: serial::PortSettings = serial::PortSettings {
        baud_rate: serial::Baud38400,
        char_size: serial::Bits8,
        parity: serial::ParityNone,
        stop_bits: serial::Stop1,
        flow_control: serial::FlowNone,
    };
    port.configure(&settings)?;

    port.set_timeout(Duration::from_secs(1))?;

    let be_data = {
        let mut v = Vec::<u8>::new();
        for item in data {
            v.push(item.to_be());
        }
        v
    };

    port.flush()?;
    port.write_all(&be_data[..])?;

    Ok(())
}

fn serial_receive() -> io::Result<Vec<u8>> {
    use serial::prelude::*;
    use std::io::prelude::*;

    let mut ret_msg: Vec<u8> = Vec::new();
    let mut port = serial::open("/dev/ttyUSB0")?;

    let settings: serial::PortSettings = serial::PortSettings {
        baud_rate: serial::Baud38400,
        char_size: serial::Bits8,
        parity: serial::ParityNone,
        stop_bits: serial::Stop1,
        flow_control: serial::FlowNone,
    };
    port.configure(&settings)?;

    port.set_timeout(Duration::from_millis(100))?;

    let mut tries = 0;

    loop {
        let mut read_buffer: Vec<u8> = vec![0; 1];

        match port.read(&mut read_buffer[..]) {
            Ok(c) => {
                if c > 0 {
                    ret_msg.extend(read_buffer);
                } else {
                    tries += 1;
                }
            }
            Err(_) => break,
        };
        if tries > 5 {
            break;
        }
    }

    Ok(ret_msg)
}