use echo_api::{t, Sender, ServiceCtx, Store};

// INFO <bot> — describe a bot and list the channels it serves.
// INFO <#channel> — show which bot (if any) is assigned to a channel.
pub fn handle(me: &str, from: &Sender, args: &[&str], ctx: &mut ServiceCtx, db: &dyn Store) {
    let Some(&target) = args.get(1) else {
        ctx.notice(me, from.uid, "Syntax: INFO <bot | #channel>");
        return;
    };

    if target.starts_with('#') {
        let Some(chan) = db.channel(target) else {
            ctx.notice(me, from.uid, t!(ctx, "\x02{chan}\x02 isn't registered.", chan = target));
            return;
        };
        match &chan.assigned_bot {
            Some(bot) => ctx.notice(me, from.uid, t!(ctx, "\x02{chan}\x02 is served by bot \x02{bot}\x02.", chan = target, bot = bot)),
            None => ctx.notice(me, from.uid, t!(ctx, "\x02{chan}\x02 has no bot assigned. Assign one with \x02ASSIGN\x02 {chan} <bot>.", chan = target)),
        }
        // The BotServ options in effect on this channel.
        let mut opts = Vec::new();
        if chan.bot_greet {
            opts.push("greets");
        }
        if chan.kickers_active {
            opts.push("kickers");
        }
        if chan.nobot {
            opts.push("nobot");
        }
        let summary = if opts.is_empty() { "none".to_string() } else { opts.join(", ") };
        ctx.notice(me, from.uid, t!(ctx, "  Options: {summary}", summary = summary));
        return;
    }

    let Some(bot) = db.bots().into_iter().find(|b| b.nick.eq_ignore_ascii_case(target)) else {
        ctx.notice(me, from.uid, t!(ctx, "There's no bot named \x02{nick}\x02. See \x02BOT LIST\x02.", nick = target));
        return;
    };
    let channels: Vec<String> = db
        .channels()
        .into_iter()
        .filter(|c| c.assigned_bot.as_deref().is_some_and(|b| b.eq_ignore_ascii_case(&bot.nick)))
        .map(|c| c.name)
        .collect();

    let privacy = if bot.private { " (private)" } else { "" };
    ctx.notice(me, from.uid, t!(ctx, "Bot \x02{nick}\x02 — {user}@{host}{privacy}", nick = bot.nick, user = bot.user, host = bot.host, privacy = privacy));
    ctx.notice(me, from.uid, t!(ctx, "  Real name: {gecos}", gecos = bot.gecos));
    if channels.is_empty() {
        ctx.notice(me, from.uid, "  Not assigned to any channel.");
    } else {
        ctx.notice(me, from.uid, t!(ctx, "  Serving {count} channel(s): {list}", count = channels.len(), list = channels.join(", ")));
    }
}