use crate::bot::module::{Action, Command, CommandSpec, Module};

pub struct Builtins;

const COMMANDS: &[CommandSpec] = &[
    CommandSpec { name: "ping", usage: "ping", about: "reply with 'pong'" },
    CommandSpec { name: "echo", usage: "echo <text>", about: "echo the text back" },
    CommandSpec { name: "hello", usage: "hello", about: "greet the sender" },
];

impl Module for Builtins {
    fn name(&self) -> &'static str {
        "builtins"
    }

    fn commands(&self) -> &'static [CommandSpec] {
        COMMANDS
    }

    fn on_command(&mut self, cmd: &Command) -> Vec<Action> {
        let reply = match cmd.name {
            "ping" => "pong".to_string(),
            "echo" => cmd.args.join(" "),
            "hello" => format!("hello, {}!", cmd.sender),
            _ => return Vec::new(),
        };
        vec![Action::Reply(reply)]
    }
}