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use db;
use util;

use clap;

pub struct Command {
    count: u64,
    random: bool,
    album: bool,
    include: db::TimeWindow,
    exclude: db::TimeWindow,

    db: db::DB,
}

pub fn subcommand<'a, 'b>() -> clap::App<'a, 'b> {
    clap::SubCommand::with_name("recommend")
        .about("Recommends an artist or album to listen to")
        .arg(
            clap::Arg::with_name("count")
                .default_value("20")
                .help("number of results to return"),
        )
        .arg(
            clap::Arg::with_name("random")
                .long("random")
                .help("picks randomly instead of by weight"),
        )
        .arg(
            clap::Arg::with_name("album")
                .long("album")
                .help("also choose a random album by the chosen artists"),
        )
        .arg(
            clap::Arg::with_name("include")
                .long("include")
                .default_value("yearly")
                .possible_values(&["all", "yearly", "monthly", "weekly"]),
        )
        .arg(
            clap::Arg::with_name("exclude")
                .long("exclude")
                .default_value("weekly")
                .possible_values(&[
                    "all", "yearly", "monthly", "weekly", "none",
                ]),
        )
}

impl Command {
    pub fn new<'a>(
        matches: &clap::ArgMatches<'a>,
    ) -> failure::Fallible<Command> {
        Ok(Command {
            count: matches.value_of("count").unwrap().parse()?,
            random: matches.is_present("random"),
            album: matches.is_present("album"),
            include: db::parse_timewindow(
                matches.value_of("include").unwrap(),
            ),
            exclude: db::parse_timewindow(
                matches.value_of("exclude").unwrap(),
            ),

            db: db::DB::new(&util::db_path()?)?,
        })
    }
}

impl super::Command for Command {
    fn run(&self) -> failure::Fallible<()> {
        let mut artists = self.db.recommend_artists(
            self.count,
            self.random,
            self.include,
            self.exclude,
        )?;
        if self.album {
            artists = artists
                .iter()
                .map(|artist| {
                    Ok(format!(
                        "{} - {}",
                        artist,
                        self.db.recommend_album(
                            &artist,
                            self.random,
                            self.include,
                            self.exclude
                        )?
                    ))
                })
                .collect::<failure::Fallible<Vec<String>>>()?;
        }
        for line in artists {
            println!("{}", line);
        }
        Ok(())
    }
}