use std::convert::TryFrom;
use std::io::Write;

use clap::ArgMatches;
use chrono::{DateTime, Utc};
use regex::Regex;

use crate::database::{Database, DBVersion};
use crate::error::{Error, Result};
use crate::commands::Command;
use crate::config::Config;
use crate::timeparse::parse_time;
use crate::old::{entries_or_warning, time_or_warning, warn_if_needed};
use crate::formatters::text;
use crate::editor;
use crate::regex::parse_regex;

#[derive(Default)]
pub struct Args {
    start: Option<DateTime<Utc>>,
    end: Option<DateTime<Utc>>,
    grep: Option<Regex>,
    fake: bool,
    sheet: Option<String>,
}

impl<'a> TryFrom<&'a ArgMatches<'a>> for Args {
    type Error = Error;

    fn try_from(matches: &'a ArgMatches) -> Result<Self> {
        Ok(Args {
            start: matches.value_of("start").map(|s| parse_time(s)).transpose()?,
            end: matches.value_of("end").map(|s| parse_time(s)).transpose()?,
            grep: matches.value_of("grep").map(parse_regex).transpose()?,
            fake: matches.is_present("fake"),
            sheet: matches.value_of("sheet").map(|s| s.to_owned()),
        })
    }
}

pub struct ArchiveCommand {}

impl<'a> Command<'a> for ArchiveCommand {
    type Args = Args;

    fn handle<D, O, E>(args: Args, db: &mut D, out: &mut O, err: &mut E, config: &Config, now: DateTime<Utc>) -> Result<()>
    where
        D: Database,
        O: Write,
        E: Write,
    {
        unimplemented!()
    }
}