use irc::client::prelude::*;

use plugin::*;

use error::ErrorKind as FrippyErrorKind;
use error::FrippyError;
use failure::ResultExt;

#[derive(PluginName, Default, Debug)]
pub struct Help;

impl Help {
    pub fn new() -> Help {
        Help {}
    }
}

impl Plugin for Help {
    fn execute(&self, _: &IrcClient, _: &Message) -> ExecutionStatus {
        ExecutionStatus::Done
    }

    fn execute_threaded(&self, _: &IrcClient, _: &Message) -> Result<(), FrippyError> {
        panic!("Help should not use threading")
    }

    fn command(&self, client: &IrcClient, command: PluginCommand) -> Result<(), FrippyError> {
        client
            .send_notice(
                &command.source,
                "Available commands: help, currency, tell, factoids, remind\r\n\
                 For more detailed help call help on the specific command.\r\n\
                 Example: 'currency help'",
            )
            .context(FrippyErrorKind::Connection)?;

        Ok(())
    }

    fn evaluate(&self, _: &IrcClient, _: PluginCommand) -> Result<String, String> {
        Err(String::from("Help has not been added yet."))
    }
}