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mod commands;
mod connection;

use ea1::connection::Connection;
use std::net::{SocketAddrV4, AddrParseError};
use std::str::FromStr;
use std::io;
use std::error::Error;
use std::io::ErrorKind;
use ea1::commands::{general, network, measurement};
use super::Result;

pub struct EA1 {
    conn: Connection,
}

pub trait Mode {
    fn measure(&mut self) -> Result<Option<f64>>;
}

pub struct Power<'a> {
    handle: &'a mut EA1,
}

impl<'a> Mode for Power<'a> {
    fn measure(&mut self) -> Result<Option<f64>> {
        let command = measurement::ReadPower::default();
        self.handle.conn.measure(command)
    }
}

impl EA1 {
    ///
    /// Open a new connection to an EA1 ethernet adapter.
    ///
    /// TODO: should initialize the connection to a known state
    ///       after opening.
    ///
    /// # Examples
    /// ```no_run
    /// use ophir::ea1::EA1;
    ///
    /// let device = EA1::open("192.168.0.100:23");
    /// ```
    ///
    pub fn open(device_address: &str) -> io::Result<EA1> {
        SocketAddrV4::from_str(device_address)
            .map_err(|e| {
                io::Error::new(ErrorKind::InvalidInput,
                               e.description())
            })
            .and_then(|a|
                      Connection::new(a.ip().clone(), a.port())
            )
            .map(|c| EA1 {
                conn: c
            })
    }

    ///
    /// Return the firmware version of the EA1.
    ///
    fn firmware_version(&mut self) -> Result<String> {
        let command = general::Version::default();
        self.conn.query_parameter(command)
    }

    ///
    /// Return the device set user name of the EA1.
    ///
    fn device_name(&mut self) -> Result<String> {
        let command = network::DeviceUserName::default();
        self.conn.query_parameter(command)
    }

    ///
    /// Create a new power measurement session.
    ///
    ///
    /// # Examples
    /// ```no_run
    /// use ophir::ea1::EA1;
    /// use ophir::ea1::Mode;
    ///
    /// let mut device = EA1::open("192.168.0.100:23").unwrap();
    /// let mut session = device.new_power_session().unwrap();
    /// let result = session.measure();
    /// ```
    pub fn new_power_session(&mut self) -> Result<Power> {
        let command = measurement::ForcePowerMode::default();
        match self.conn.assert(command) {
            Ok(_) => Ok(Power { handle: self }),
            Err(e) => Err(e),
        }
    }
}

mod tests {
    use std::env;
    use std::thread;
    use std::time;
    use super::EA1;
    use super::Mode;

    const ea1_address_key: &'static str = "OPHIR_EA1_TEST_ADDR";
    
    #[test]
    #[ignore]
    fn device_communication() {
        let address = env::var(ea1_address_key).unwrap();
        let device = EA1::open(&address);
        assert!(device.is_ok());

        let mut device = device.unwrap();

        let version = device.firmware_version();
        assert!(version.is_ok());

        let measurement = device.new_power_session()
            .and_then(|mut s| {
                s.measure()
            });
        assert!(measurement.is_ok());
    }
}