use std::{
    io::{self, Write},
    iter,
};

use rand::{seq::SliceRandom, thread_rng};
// use rayon::prelude::*;
use kartsimrust::{
    character::Character,
    combat::{make_them_fight, EncounterType},
    random_character::random_character,
    stats::Stat,
};

fn print_chars<'a, L>(characters: L)
where
    L: IntoIterator<Item = &'a Character>,
{
    println!("Name     | Classes                   | HP MP AC DP | STR DEX CON STB | INT KND CMP CHA | Armor  | Weapon");
    for ch in characters {
        let mut c = ch.to_owned();
        c.init_encounter(EncounterType::Physical);
        println!(
            "{name:<8} | {class1:<12} {class2:<12} | {hp:>2} {mp:>2} {ac:>2} {dp:>2} | {str:>3} {dex:>3} {con:>3} {stb:>3} | {int:>3} {knd:>3} {cmp:>3} {cha:>3} | {armor:<6} | {weapon:<15}",
            name = c.name,
            class1 = c.class1,
            class2 = c.class2,
            hp=c.hp,
            mp = c.mp,
            ac=c.ac(),
            dp = c.dice_pool(),
            str=c.stat(Stat::STR),
            dex=c.stat(Stat::DEX),
            con=c.stat(Stat::CON),
            stb=c.stat(Stat::STB),
            int=c.stat(Stat::INT),
            knd=c.stat(Stat::KND),
            cmp=c.stat(Stat::CMP),
            cha=c.stat(Stat::CHA),
            armor = c.armor,
            weapon = c.weapon,
        );
    }
}

fn main() {
    env_logger::init();

    let mut rng = thread_rng();

    let n = 100;
    let keep = 20;
    let gen = 50000;

    let mut characters: Vec<Character> = iter::repeat_with(random_character).take(n).collect();
    print_chars(characters.iter().take(keep).collect::<Vec<&Character>>());

    for g in 0..gen {
        characters.shuffle(&mut rng);

        let teams: (Vec<(usize, Character)>, Vec<(usize, Character)>) = characters
            .iter()
            .cloned()
            .enumerate()
            .partition(|(i, _)| *i % 2 == 0);
        let matches: Vec<(Character, Character)> = iter::zip(teams.0.iter(), teams.1.iter())
            .map(|((_, c1), (_, c2))| (c1.to_owned(), c2.to_owned()))
            .collect();

        let mut winners: Vec<(i64, Character)> = matches
            .iter()
            .map(|(c1, c2)| {
                let n_rounds = 50;
                let mut w: i64 = 0;

                for _i in 0..n_rounds {
                    let mut c1l = c1.to_owned();
                    let mut c2l = c2.to_owned();
                    let t = make_them_fight(vec![&mut c1l], vec![&mut c2l]);

                    match t {
                        Some(_turns) => {
                            if c2l.hp <= 0 {
                                w += 1
                            }
                        }
                        None => (),
                    }
                }
                if w >= n_rounds / 2 {
                    (-w, c1.to_owned())
                } else {
                    (-(n_rounds - w), c2.to_owned())
                }
            })
            .collect();

        winners.sort_by_key(|(i, _)| *i);

        characters = winners
            .iter()
            .take(keep)
            .map(|(_, c)| c.clone())
            .chain(
                (0..(n - keep))
                    .into_iter()
                    .map(|_| random_character())
                    .take(n - keep),
            )
            .collect();

        if g % (gen / 100) == 0 {
            print!(
                "\r{:#<c$}{:.<r$}",
                "",
                "",
                c = (((g as f32) / (gen as f32)) * 100.0) as usize,
                r = 100 - (((g as f32) / (gen as f32)) * 100.0) as usize
            );
            io::stdout().flush().unwrap();
        }
    }

    println!("");

    print_chars(characters.iter().take(keep).collect::<Vec<&Character>>());
}