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use crossbeam_channel::{Receiver, Sender};
use pipeline::{PipelineInfo, PipelineJoin};
use pipeline_matcher::PathMatch;
use std::collections::HashMap;
use std::time::{Duration, Instant};

// ---------------------------------------------------------------------------------------------------------------------
// PipelineSorter
// ---------------------------------------------------------------------------------------------------------------------

pub struct PipelineSorter {
    pub infos: Vec<String>,
    pub errors: Vec<String>,
    pub through: bool,
    map: HashMap<usize, PathMatch>,
    seq_no: usize,
    join_num: usize,
    time_beg: Instant,
    time_bsy: Duration,
}

impl PipelineSorter {
    pub fn new(num: usize) -> Self {
        PipelineSorter {
            infos: Vec::new(),
            errors: Vec::new(),
            through: false,
            map: HashMap::new(),
            seq_no: 0,
            join_num: num,
            time_beg: Instant::now(),
            time_bsy: Duration::new(0, 0),
        }
    }
}

impl PipelineJoin<PathMatch, PathMatch> for PipelineSorter {
    fn setup(&mut self, id: usize, rx: Vec<Receiver<PipelineInfo<PathMatch>>>, tx: Sender<PipelineInfo<PathMatch>>) {
        self.infos = Vec::new();
        self.errors = Vec::new();
        let mut seq_beg_arrived = false;
        let mut end_num = 0;

        loop {
            for rx in &rx {
                match rx.recv() {
                    Ok(PipelineInfo::SeqDat(x, p)) => {
                        watch_time!(self.time_bsy, {
                            if self.through {
                                let _ = tx.send(PipelineInfo::SeqDat(x, p));
                            } else {
                                self.map.insert(x, p);
                                loop {
                                    if !self.map.contains_key(&self.seq_no) {
                                        break;
                                    }
                                    {
                                        let ret = self.map.get(&self.seq_no).unwrap();
                                        let _ = tx.send(PipelineInfo::SeqDat(self.seq_no, ret.clone()));
                                    }
                                    let _ = self.map.remove(&self.seq_no);
                                    self.seq_no += 1;
                                }
                            }
                        });
                    }

                    Ok(PipelineInfo::SeqBeg(x)) => {
                        if !seq_beg_arrived {
                            self.seq_no = x;
                            self.time_beg = Instant::now();
                            let _ = tx.send(PipelineInfo::SeqBeg(x));
                            seq_beg_arrived = true;
                        }
                    }

                    Ok(PipelineInfo::SeqEnd(x)) => {
                        end_num += 1;
                        if end_num != self.join_num {
                            continue;
                        }

                        for i in &self.infos {
                            let _ = tx.send(PipelineInfo::MsgInfo(id, i.clone()));
                        }
                        for e in &self.errors {
                            let _ = tx.send(PipelineInfo::MsgErr(id, e.clone()));
                        }

                        let _ = tx.send(PipelineInfo::MsgTime(id, self.time_bsy, self.time_beg.elapsed()));
                        let _ = tx.send(PipelineInfo::SeqEnd(x));
                        break;
                    }

                    Ok(PipelineInfo::MsgInfo(i, e)) => {
                        let _ = tx.send(PipelineInfo::MsgInfo(i, e));
                    }
                    Ok(PipelineInfo::MsgErr(i, e)) => {
                        let _ = tx.send(PipelineInfo::MsgErr(i, e));
                    }
                    Ok(PipelineInfo::MsgTime(i, t0, t1)) => {
                        let _ = tx.send(PipelineInfo::MsgTime(i, t0, t1));
                    }
                    Err(_) => break,
                }
            }
        }
    }
}

// ---------------------------------------------------------------------------------------------------------------------
// Test
// ---------------------------------------------------------------------------------------------------------------------

#[cfg(test)]
mod tests {
    use super::*;
    use crossbeam_channel::unbounded;
    use pipeline::{PipelineInfo, PipelineJoin};
    use pipeline_matcher::PathMatch;
    use std::path::PathBuf;
    use std::thread;

    #[test]
    fn pipeline_sorter() {
        let mut sorter = PipelineSorter::new(1);

        let (in_tx, in_rx) = unbounded();
        let (out_tx, out_rx) = unbounded();
        thread::spawn(move || {
            sorter.setup(0, vec![in_rx], out_tx);
        });

        let _ = in_tx.send(PipelineInfo::SeqBeg(0));
        let _ = in_tx.send(PipelineInfo::SeqDat(
            2,
            PathMatch {
                path: PathBuf::from("./"),
                matches: Vec::new(),
            },
        ));
        let _ = in_tx.send(PipelineInfo::SeqDat(
            1,
            PathMatch {
                path: PathBuf::from("./"),
                matches: Vec::new(),
            },
        ));
        let _ = in_tx.send(PipelineInfo::SeqDat(
            0,
            PathMatch {
                path: PathBuf::from("./"),
                matches: Vec::new(),
            },
        ));
        let _ = in_tx.send(PipelineInfo::SeqEnd(3));

        let mut ret = Vec::new();
        loop {
            match out_rx.recv().unwrap() {
                PipelineInfo::SeqDat(x, _) => ret.push(x),
                PipelineInfo::SeqEnd(_) => break,
                _ => (),
            }
        }

        assert_eq!(ret[0], 0);
        assert_eq!(ret[1], 1);
        assert_eq!(ret[2], 2);
    }
}