// Copyright 2018 Peter Williams <peter@newton.cx> and collaborators
// Licensed under the MIT License

/*! Make a list of recent jobs belonging to this user.
 */

extern crate chrono;
#[macro_use] extern crate clap;
extern crate failure;
extern crate itertools;
extern crate slurm;

use chrono::{Duration, Utc};
use clap::App;
use failure::Error;
use itertools::Itertools;
use slurm::JobStepRecordSharedFields;
use std::collections::HashMap;
use std::process;

fn main() {
    let _matches = App::new("rsinfo")
        .version(crate_version!())
        .about("Make a list of recent jobs")
        .get_matches();

    process::exit(match inner() {
        Ok(code) => code,

        Err(e) => {
            eprintln!("fatal error in account");
            for cause in e.causes() {
                eprintln!("  caused by: {}", cause);
            }
            1
        },
    });
}


fn inner() -> Result<i32, Error> {
    let now = Utc::now();
    let min_start = now - Duration::days(7);

    let mut filter = slurm::JobFiltersOwned::default();
    filter.userid_list_mut().append("555409");
    filter.usage_start(min_start);

    let db = slurm::DatabaseConnectionOwned::new()?;
    let jobs = db.get_jobs(&filter)?;

    for (arrayid, group) in &jobs.iter().group_by(|job| job.array_job_id().unwrap_or_else(|| job.job_id())) {
        let mut n_jobs = 0;
        let mut last_state = slurm::JobState::Failed;
        let mut states = HashMap::new();

        for job in group {
            if n_jobs == 0 {
                print!("{} {}: ", arrayid, job.job_name());
            }

            n_jobs += 1;
            last_state = job.state();
            let slot = states.entry(last_state).or_insert(0);
            *slot += 1;
        }

        if n_jobs == 1 {
            println!("{:2}", last_state.shortcode());
        } else {
            let seen_states = states.keys().sorted();
            let text = seen_states
                .iter()
                .map(|s| format!("{} {}", states.get(s).unwrap(), s.shortcode()))
                .join(", ");
            println!("{} ({} total)", text, n_jobs);
        }
    }

    Ok(0)
}