extern crate kolmogorov_smirnov as ks;
extern crate csv;
extern crate serde;
extern crate chrono;

use std::fs::File;
use std::io::prelude::*;

//use std::fs::File;
use serde::Deserialize;
use serde::Serialize;
use std::collections::HashMap;
use std::env;
use std::io::LineWriter;

pub type Score = u32;
pub type JobCoding = Vec<Score>;
pub type Similarity = f32;

pub type Jobid = u32;
pub type QCodings = HashMap<Jobid, JobCoding>;

#[derive(Debug, Deserialize)]
pub struct Record {
    jobid: u32,
    //q16_coding: String,
    ks_coding: String,
}

#[derive(Debug, Serialize)]
pub struct SimilarityRow {
    pub jobid: u32,
    pub alg_id: u32,
    pub alg_name: String,
    pub similarity: f32
}

#[derive(Debug, Serialize)]
pub struct ProgressRow {
    jobid: u32,
    alg_id: u32,
    alg_name: String,
    delta: i64,
}

pub fn convert_to_coding(coding: String) -> Vec<Score> {
    let split = coding.split(":");
    let vec: Vec<Score> = split
        .filter(|s| !s.is_empty())
        //.map(|s| s.parse::<F>().unwrap())
        .map(|s| s.parse().unwrap())
        .collect();
    vec
}


//fn ks_similarity(xs: &Vec<u32>, ys: &Vec<u32>) -> Result<Similarity, String> {
//    let confidence = 0.95;
//    ks::test(xs, ys, confidence)?

//    let reject_probability = match result {
//        Ok(v) => v.reject_probability,
//        Err(_) => 1.0,
//    };
//    //println!("is_rejected: {:?}\nstatistic: {:?}\nreject_probability: {:?}\ncritical_value: {:?}\nconfidence: {:?}", result.is_rejected, result.statistic, result.reject_probability, result.critical_value, result.confidence);
//    (1.0 - reject_probability) as Similarity
//}


fn run(dataset_fn: String, jobid: Jobid, similarities_fn: String, progress_fn: String, log_fn: String) {
    let mut q_codings: QCodings = HashMap::new();
    let file = File::open(&dataset_fn).expect("Unable to open dataset.");
    let mut rdr = csv::Reader::from_reader(file);

    //for result in rdr.deserialize().take(10000) {
    for result in rdr.deserialize() {
        let record: Record = result.expect("bla bla");
        //let q_coding = convert_to_coding(record.q16_coding);
        let q_coding = convert_to_coding(record.ks_coding);
        // Insert Non-Zero jobs only
        if q_coding.iter().sum::<Score>() > (0 as Score) {
           q_codings.insert(record.jobid, q_coding);
        }
    }

    let probe = q_codings[&jobid].clone();
    let similarities_file = File::create(&similarities_fn).expect("Unable to open");
    let mut wtr_similarities = csv::Writer::from_writer(&similarities_file);
    let alg_name = "ks";
    let alg_id = 6;

    let progress_file = File::create(&progress_fn).expect("Unable to open");
    let mut wtr_progress = csv::Writer::from_writer(&progress_file);
    let mut start = chrono::Utc::now();
    let mut counter = 1;

    let mut avail_codings: Vec<(u32, &JobCoding)>;

    avail_codings = q_codings.iter().map(|(k, v)| (*k, v)).collect();
    let mut similarities: Vec<(Jobid, Similarity)> = Vec::new();

    let log_file = File::create(&log_fn).expect("Unable to open");
    let mut log_file = LineWriter::new(log_file);


    while let Some((jobid, q_coding)) = avail_codings.pop() {
        if (counter % 10_000) == 0 {
            let stop = chrono::Utc::now();
            let progress_row = ProgressRow {
                jobid: jobid,
                alg_id: alg_id,
                alg_name: String::from(alg_name),
                delta: ((stop - start).num_nanoseconds().unwrap())
            };
            wtr_progress.serialize(progress_row).unwrap();
            start = stop;
        }

        //println!("Processing {:?}", jobid);
        //let similarity = ks_similarity(q_coding, &probe);
        
        let confidence = 0.95;
        let similarity = match ks::test(q_coding, &probe, confidence) {
            Ok(sim) => (1.0 - sim.reject_probability) as Similarity,
            Err(e) => {
                let message = format!("jobid failed {:?}, because \" {:?}\"\n", jobid, e);
                log_file.write_all(message.as_bytes()).unwrap();
                1.0
            }
        };

        similarities.push((jobid, similarity));
        counter += 1;
    }

    for (jobid, similarity) in similarities.iter() {
        let similarity_row = SimilarityRow {
            jobid: *jobid,
            alg_id: alg_id,
            alg_name: String::from(alg_name),
            similarity: *similarity,
        };
        wtr_similarities.serialize(similarity_row).unwrap();
    }
    log_file.flush().unwrap();
}




fn main() {
    let args: Vec<String> = env::args().collect();
    let dataset_fn = args[1].clone();
    let jobid = args[2].parse::<u32>().unwrap();
    let sim_fn = args[3].clone();
    let progress_fn = args[4].clone();
    let log_fn = args[5].clone();
    println!("{:?}", args);

    run(dataset_fn, jobid, sim_fn, progress_fn, log_fn);
}


mod tests {
    //use super::*;

    #[test]
    fn test_ks_test() {
        let xs = vec!(0.0  , 1.0  , 2.0  , 3.0 , 4.0 , 5.0 , 6.0 , 7.0 , 8.0 , 9.0 , 10.0 , 11.0 , 12.0);
        let ys = vec!(12.0 , 11.0 , 10.0 , 9.0 , 8.0 , 7.0 , 6.0 , 5.0 , 4.0 , 3.0 , 2.0  , 1.0  , 0.0);

        ks_test(xs, ys);

        let c1 = vec![141.0,143.0,142.0,238.0,132.0,486.0,38.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,128.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0];
        let c2 = vec![239.0,239.0,255.0,255.0,239.0,239.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,511.0,502.0,511.0,503.0];
        ks_test(c1, c2);


        let c1 = vec![2.0,2.0,2.0,9.0,3.0,0.0,0.0,0.0];
        let c2 = vec![2.0,2.0,2.0,2.0,8.0,3.0,0.0,10.0];
        ks_test(c1, c2);
    }
}