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extern crate fs_extra;

use crate::args::Args;
use crate::reader::BufReader;
use file_manager::File;
use std::env::current_dir;
use std::io::Write;
use std::process::exit;

pub mod args;
pub mod file_manager;
pub mod misc;
mod reader;

pub fn app(args: Option<Args>) {
    let args: Args = match args {
        Some(a) => a,
        None => Args::load(),
    };

    let file = File::new(&args.file, !args.not_signed_file).unwrap();
    let header = file.header();

    let (each, remain) = misc::lines_per_file(&file, args.number_of_files).unwrap_or_else(|| {
        eprintln!(
            "Can't split {} lines between {} files",
            file.lines() - header,
            args.number_of_files
        );
        exit(1);
    });

    let mut buf_reader = BufReader::open(file.file_path.as_str()).unwrap();

    let target_dir = format!(
        "{}/{}",
        current_dir().unwrap().display(),
        &file.base_name().unwrap()
    );
    fs_extra::dir::create(&target_dir, true).unwrap();

    let headers = misc::read_n_lines(&mut buf_reader, file.header());

    for i in 1..=args.number_of_files {
        let r = misc::read_n_lines(&mut buf_reader, each);
        let mut f = std::fs::File::create(&format!(
            "{}/{}_{}.csv",
            &target_dir,
            file.base_name().unwrap(),
            i
        ))
        .expect("Unable to create file");

        f.write_all(headers.as_bytes())
            .expect("Unable to write data");
        f.write_all(r.as_bytes()).expect("Unable to write data");
        if args.verbose {
            println!(
                "Wrote {} rows to {}", each, &format!("{}/{}_{}.csv", &target_dir, file.base_name().unwrap(), i)
            );
        }

        if i == args.number_of_files && args.remaining_in_last && remain > 0 {
            let r = misc::read_n_lines(&mut buf_reader, remain);

            f.write_all(r.as_bytes()).expect("Unable to write data");
            if args.verbose {
                println!(
                    "Wrote {} remaining rows to {}", remain,
                    &format!(
                        "{}/{}_{}.csv",
                        &target_dir,
                        file.base_name().unwrap(),
                        i
                    )
                );
            }
        }
    }

    if remain > 0 && !args.remaining_in_last {
        let r = misc::read_n_lines(&mut buf_reader, remain);
        let mut f = std::fs::File::create(&format!(
            "{}/{}_{}.csv",
            &target_dir,
            file.base_name().unwrap(),
            args.number_of_files + 1
        ))
            .expect("Unable to create file");

        f.write_all(headers.as_bytes())
            .expect("Unable to write data");
        f.write_all(r.as_bytes()).expect("Unable to write data");
        if args.verbose {
            println!(
                "Wrote {} remaining rows to {}", remain,
                &format!(
                    "{}/{}_{}.csv",
                    &target_dir,
                    file.base_name().unwrap(),
                    args.number_of_files + 1
                )
            );
        }
    }
}