/* relish: versatile lisp shell
 * Copyright (C) 2021 Aidan Hahn
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

use crate::segment::{Ctr};
use crate::str::{get_echo, get_concat};
use crate::append::get_append;
use crate::func::{FTable, func_declare};
use crate::vars::{VTable, get_export};
use std::rc::Rc;
use std::cell::RefCell;

pub fn get_stdlib(conf: Rc<RefCell<VTable>>) -> Result<Rc<RefCell<FTable>>, String> {
    let ft = Rc::new(RefCell::new(FTable::new()));
    if let Some(s) = func_declare(ft.clone(), Rc::new(RefCell::new(get_echo()))) {
        return Err(s)
    }
    if let Some(s) = func_declare(ft.clone(), Rc::new(RefCell::new(get_append()))) {
        return Err(s)
    }
    if let Some(s) = func_declare(ft.clone(), Rc::new(RefCell::new(get_concat()))) {
        return Err(s)
    }

    let mut cfg_env = true;
    match conf.borrow().get(&String::from("CFG_RELISH_ENV")) {
        None => {
            println!("CFG_RELISH_ENV not defined. defaulting to ON.")
        }
        Some(ctr) => {
            match (**ctr).clone() {
                Ctr::String(ref s) => {
                    cfg_env = s.eq("0")
                }
                _ => {
                    println!("Invalid value for CFG_RELISH_ENV. must be a string (0 or 1).");
                    println!("Defaulting CFG_RELISH_ENV to ON");
                }
            }
        }
    }

    if let Some(s) = func_declare(ft.clone(), Rc::new(RefCell::new(get_export(cfg_env)))) {
        return Err(s)
    }

    return Ok(ft)
}