use super::{
    VerbContext, UserVerb, UserVerbRef, UResult,
    CommandHandlingError::UserError
};
use async_trait::async_trait;
use ansi_macro::ansi;
use phf::phf_map;

static HELP_PAGES: phf::Map<&'static str, &'static str> = phf_map! {
    "" =>
        ansi!("Type <bold>help <lt>topicname><reset> to learn about a topic. Most \
          commands can be used as a topicname.\r\n\
          Topics of interest to new users:\r\n\
          \t<bold>register<reset>\tLearn about the <bold>register<reset> command.\r\n\
          \t<bold>newbie<reset>\tLearn how to survive as a newb."),
    "<topicname>" =>
        ansi!("You are supposed to replace <lt>topicname> with the topic you want \
         to learn about. Example:\r\n\
         \t<bold>help register<reset> will tell you about the register command.")
};

static EXPLICIT_HELP_PAGES: phf::Map<&'static str, &'static str> = phf_map! {
    "fuck" =>
        ansi!("Type <bold>fuck <lt>name><reset> to fuck someone. It only works if \
               they have consented.")
};

pub struct Verb;
#[async_trait]
impl UserVerb for Verb {
    async fn handle(self: &Self, ctx: &VerbContext, _verb: &str, remaining: &str) -> UResult<()> {
        let mut help = None;
        if !ctx.session_dat.less_explicit_mode {
            help = help.or_else(|| EXPLICIT_HELP_PAGES.get(remaining))
        }
        help = help.or_else(|| HELP_PAGES.get(remaining));
        let help_final = help.ok_or(
            UserError("No help available on that".to_string()))?;
        ctx.trans.queue_for_session(ctx.session,
                                    Some(&(help_final.to_string() + "\r\n"))
        ).await?;
        Ok(())
    }
}
static VERB_INT: Verb = Verb;
pub static VERB: UserVerbRef = &VERB_INT as UserVerbRef;