use std::collections::HashMap;

use strum::IntoEnumIterator;
use strum_macros::AsRefStr; // derive macro
use strum_macros::EnumIter;
use strum_macros::EnumString;
use strum_macros::IntoStaticStr;

/// Commands that can be invoked by starting a message with a leading slash.
#[derive(
    Debug, Clone, Copy, PartialEq, Eq, Hash, EnumString, EnumIter, AsRefStr, IntoStaticStr,
)]
#[strum(serialize_all = "kebab-case")]
pub enum SlashCommand {
    Clear,
    ToggleMouseMode,
    Quit,
}

impl SlashCommand {
    /// User-visible description shown in the popup.
    pub fn description(self) -> &'static str {
        match self {
            SlashCommand::Clear => "Clear the chat history.",
            SlashCommand::ToggleMouseMode => {
                "Toggle mouse mode (enable for scrolling, disable for text selection)"
            }
            SlashCommand::Quit => "Exit the application.",
        }
    }

    /// Command string without the leading '/'. Provided for compatibility with
    /// existing code that expects a method named `command()`.
    pub fn command(self) -> &'static str {
        self.into()
    }
}

/// Return all built-in commands in a HashMap keyed by their command string.
pub fn built_in_slash_commands() -> HashMap<&'static str, SlashCommand> {
    SlashCommand::iter().map(|c| (c.command(), c)).collect()
}