use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};

use mlua::{UserData, UserDataFields};

use self::theme::Theme;

pub mod constants;
pub mod theme;

#[derive(Debug, Default)]
pub struct GlobalConfig {
    pub theme: Theme,
}

static GLOBAL_CONFIG: RwLock<GlobalConfig> = RwLock::new(GlobalConfig::new());
const DUMMY_CONFIG: GlobalConfig = GlobalConfig::new();

impl GlobalConfig {
    const fn new() -> Self {
        Self {
            theme: Theme::new(),
        }
    }

    pub fn instance() -> RwLockReadGuard<'static, Self> {
        GLOBAL_CONFIG.read().unwrap()
    }

    pub fn instance_mut() -> RwLockWriteGuard<'static, Self> {
        GLOBAL_CONFIG.write().unwrap()
    }
}

impl UserData for GlobalConfig {
    fn add_fields<'lua, F: UserDataFields<'lua, Self>>(fields: &mut F) {
        fields.add_field_function_get("theme", |_, _| Ok(DUMMY_CONFIG.theme))
    }
}