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/// Contains simple drivers for some
/// of the games supported by the Minimax
/// engine.
mod drivers {

    use crate::strategy::*;
    use crate::tictactoe::*;

    /// Read input.
    pub fn get_input() -> String {
        let mut buffer = String::new();
        std::io::stdin().read_line(&mut buffer).expect("Failed");
        buffer
    }

    /// Play a game of any size in a REPL against the engine.
    /// The default depth of 6 should make the
    /// engine reasonably fast.
    pub fn play_tic_tac_toe_against_computer(size: usize) {
        play_tic_tac_toe_against_computer_with_depth(size, 6)
    }

    /// Play a game of any size in a REPL against the engine.
    /// The higher the depth, the longer it takes and
    /// the more accurately the engine performs.
    pub fn play_tic_tac_toe_against_computer_with_depth(size: usize, depth: i64) {
        let mut ttt = TicTacToe::create_game(size, None, None, None);
        loop {
            println!("Board:\n");
            ttt.print_board();
            println!("\n");

            if ttt.is_game_complete() {
                println!("Game is complete.");
                if ttt.is_game_tied() {
                    println!("Game Tied!");
                    break;
                } else {
                    println!("{} wins!", ttt.get_winner());
                    break;
                }
            }

            let example_num: i64 = 7;
            println!(
                "Enter a move. (e.g. '{}' represents (row: {}, col: {}) : ",
                example_num,
                example_num as usize / size,
                example_num as usize % size
            );
            let s = get_input().trim().parse::<usize>();
            let n = s.unwrap_or(usize::MAX);

            if n == usize::MAX {
                break;
            }
            println!(
                "Move played by you: {} (i.e. {}, {})",
                n,
                n / size,
                n % size
            );
            ttt.play(&n, true);
            let move_found = ttt.get_best_move(depth as i64, true);
            if move_found > (ttt.size * ttt.size) {
                println!("Game is complete.");
                if ttt.is_game_tied() {
                    println!("Game Tied!");
                    break;
                } else {
                    println!("{} wins!", ttt.get_winner());
                    break;
                }
            }
            println!(
                "Move played by AI: {} (i.e. {}, {})",
                move_found,
                move_found / size,
                move_found % size
            );
            ttt.play(&move_found, false);
        }
    }
}