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

use clap::ArgMatches;

use crate::database::Database;
use crate::error;
use crate::commands::Command;
use crate::config::Config;

#[derive(Default)]
pub struct Args {
    sheet: Option<String>,
}

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

    fn try_from(matches: &'a ArgMatches) -> Result<Self, Self::Error> {
        Ok(Args {
            sheet: matches.value_of("sheet").map(|s| s.into()),
        })
    }
}

pub struct SheetCommand {}

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

    fn handle<D, O, E>(args: Args, db: &mut D, _out: &mut O, _err: &mut E, config: &Config) -> error::Result<()>
    where
        D: Database,
        O: Write,
        E: Write,
    {
        unimplemented!()
    }
}

#[cfg(test)]
mod tests {
    use chrono::{Utc, TimeZone};

    use crate::database::SqliteDatabase;
    use crate::test_utils::PrettyString;

    use super::*;

    #[test]
    fn list_sheets() {
        let args = Default::default();
        let mut db = SqliteDatabase::from_memory().unwrap();
        let mut out = Vec::new();
        let mut err = Vec::new();
        let config = Default::default();

        db.entry_insert(Utc.ymd(2021, 1, 1).and_hms(0, 0, 0), None, None, "_archived".into()).unwrap();
        db.entry_insert(Utc.ymd(2021, 1, 1).and_hms(0, 0, 0), None, None, "sheet1".into()).unwrap();
        db.entry_insert(Utc.ymd(2021, 1, 1).and_hms(0, 0, 0), None, None, "sheet2".into()).unwrap();
        db.entry_insert(Utc.ymd(2021, 1, 1).and_hms(0, 0, 0), None, None, "sheet3".into()).unwrap();

        SheetCommand::handle(args, &mut db, &mut out, &mut err, &config).unwrap();

        assert_eq!(PrettyString(&String::from_utf8_lossy(&out)), PrettyString(" Timesheet         Running     Today       Total Time
 sheet1              0:00:00     0:00:00    10:13:55
*sheet2               0:00:00     0:00:00     0:00:00
-sheet3             0:00:00     1:52:45     9:32:03
"));
    }

    #[test]
    fn switch_to_sheet() {
        assert!(false);
    }

    #[test]
    fn switch_to_sheet_already_in() {
        assert!(false);
    }
}