use rand::prelude::SliceRandom;
use rand::{Rng};
use crate::board::Letter;

pub const GRID_LENGTH: u8 = 15;
pub const TRAY_LENGTH: u8 = 7;
pub const ALL_LETTERS_BONUS: u32 = 50;

pub fn standard_tile_pool<R: Rng>(rng: Option<&mut R>) -> Vec<Letter> {
    let mut letters = Vec::new();

    fn add_n_times(vector: &mut Vec<Letter>, letter: Letter, n: usize) {
        for _ in 0..n {
            vector.push(letter);
        }
    }

    add_n_times(&mut letters, Letter::new(Some('A'), 1), 9);
    add_n_times(&mut letters, Letter::new(Some('B'), 3), 2);
    add_n_times(&mut letters, Letter::new(Some('C'), 3), 2);
    add_n_times(&mut letters, Letter::new(Some('D'), 2), 4);
    add_n_times(&mut letters, Letter::new(Some('E'), 1), 12);
    add_n_times(&mut letters, Letter::new(Some('F'), 4), 2);
    add_n_times(&mut letters, Letter::new(Some('G'), 2), 3);
    add_n_times(&mut letters, Letter::new(Some('H'), 4), 2);
    add_n_times(&mut letters, Letter::new(Some('I'), 1), 9);
    add_n_times(&mut letters, Letter::new(Some('J'), 8), 1);
    add_n_times(&mut letters, Letter::new(Some('K'), 5), 1);
    add_n_times(&mut letters, Letter::new(Some('L'), 1), 4);
    add_n_times(&mut letters, Letter::new(Some('M'), 3), 2);
    add_n_times(&mut letters, Letter::new(Some('N'), 1), 6);
    add_n_times(&mut letters, Letter::new(Some('O'), 1), 8);
    add_n_times(&mut letters, Letter::new(Some('P'), 3), 2);
    add_n_times(&mut letters, Letter::new(Some('Q'), 10), 1);
    add_n_times(&mut letters, Letter::new(Some('R'), 1), 6);
    add_n_times(&mut letters, Letter::new(Some('S'), 1), 4);
    add_n_times(&mut letters, Letter::new(Some('T'), 1), 6);
    add_n_times(&mut letters, Letter::new(Some('U'), 1), 4);
    add_n_times(&mut letters, Letter::new(Some('V'), 4), 2);
    add_n_times(&mut letters, Letter::new(Some('W'), 4), 2);
    add_n_times(&mut letters, Letter::new(Some('X'), 8), 1);
    add_n_times(&mut letters, Letter::new(Some('Y'), 4), 2);
    add_n_times(&mut letters, Letter::new(Some('Z'), 10), 1);

    add_n_times(&mut letters, Letter::new(None, 0), 2);

    if rng.is_some() {
        letters.shuffle(rng.unwrap());
    }

    letters

}