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use std::time;
use std::fmt;
use std::iter;
use crate::error::Result;
use itertools::Itertools;


#[cfg(feature = "j2534")]
pub mod j2534can;
#[cfg(feature = "j2534")]
pub use self::j2534can::J2534Can;

#[cfg(feature = "socketcan")]
pub mod socketcan;
#[cfg(feature = "socketcan")]
pub use self::socketcan::SocketCan;

#[derive(Debug)]
pub struct Message {
    pub id: u32,
    pub data: Vec<u8>,
}

impl Default for Message {
    fn default() -> Message {
        Message {
            id: 0,
            data: Vec::new(),
        }
    }
}

impl fmt::Display for Message {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "[{:X}] {}", self.id, self.data.iter()
                                               .map(|x| format!("{:X}", x))
                                               .join(" "))?;
        Ok(())
    }
}

/// Used to implement recv_iter
pub trait CanInterfaceIterator {
    fn recv_iter(&self, timeout: time::Duration) -> RecvIterator;
}

pub trait CanInterface: CanInterfaceIterator {
    /// Sends a CAN message through the interface.
    /// 
    /// # Arguments
    /// 
    /// * `id` - The CAN id of the message
    /// * `message` - The message data. Must not be larger than 8 bytes
    fn send(&self, id: u32, message: &[u8]) -> Result<()>;

    fn send_msg(&self, message: &Message) -> Result<()> {
        self.send(message.id, &message.data)
    }

    /// Received a single message from the interface.
    /// If no messages are received before the timeout, returns `Error::Timeout`
    /// 
    /// # Arguments
    /// 
    /// * `timeout` - The time to wait for a message before returning
    fn recv(&self, timeout: time::Duration) -> Result<Message>;
}

impl<S: Sized + CanInterface> CanInterfaceIterator for S {
    fn recv_iter(&self, timeout: time::Duration) -> RecvIterator {
        RecvIterator {
            interface: self,
            timeout
        }
    }
}

pub struct RecvIterator<'a> {
    interface: &'a CanInterface,
    timeout: time::Duration,
}

impl<'a> iter::Iterator for RecvIterator<'a> {
    type Item = Result<Message>;

    fn next(&mut self) -> Option<Self::Item> {
        Some(self.interface.recv(self.timeout))
    }
}