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use format::frame::Frame;
use std::collections::{HashMap,HashSet,VecDeque};
use generated::Class;
use api::{Answer,ChannelState};
use queue::*;

#[derive(Clone,Debug,PartialEq)]
pub struct Channel {
  pub id:             u16,
  pub state:          ChannelState,
  pub frame_queue:    VecDeque<Frame>,
  pub send_flow:      bool,
  pub receive_flow:   bool,
  pub queues:         HashMap<String,Queue>,
  pub prefetch_size:  u32,
  pub prefetch_count: u16,
  pub awaiting:       VecDeque<Answer>,
  pub confirm:        bool,
  pub message_count:  u64,
  pub acked:          HashSet<u64>,
  pub nacked:         HashSet<u64>,
  pub unacked:        HashSet<u64>,
}

impl Channel {
  pub fn new(channel_id: u16) -> Channel {
    Channel {
      id:             channel_id,
      state:          ChannelState::Initial,
      frame_queue:    VecDeque::new(),
      send_flow:      true,
      receive_flow:   true,
      queues:         HashMap::new(),
      prefetch_size:  0,
      prefetch_count: 0,
      awaiting:       VecDeque::new(),
      confirm:        false,
      message_count:  0,
      acked:          HashSet::new(),
      nacked:         HashSet::new(),
      unacked:        HashSet::new(),
    }
  }

  pub fn global() -> Channel {
    Channel::new(0)
  }

  pub fn received_method(&mut self, m: Class) {
    trace!("channel[{}] received {:?}", self.id, m);
    //FIXME: handle method here instead of queuing
    self.frame_queue.push_back(Frame::Method(self.id,m));
  }

  pub fn is_connected(&self) -> bool {
    self.state != ChannelState::Initial && self.state != ChannelState::Closed && self.state != ChannelState::Error
  }
}