#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::fmt;
use std::fs::File;
use std::io::Read;

#[derive(Eq, PartialEq, Clone, Copy)]
enum State {
    Ok,
    Nok,
    Unk,
}
impl std::fmt::Debug for State {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let a = match self {
            State::Ok => '.',
            State::Nok => '#',
            State::Unk => '?',
        };
        write!(f, "{}", a)
    }
}

type Line = (Vec<State>, Vec<usize>);

fn rec(l: Line) -> usize {
    for i in 0..l.0.len() {
        if l.0[i] == State::Unk {
            let mut sum = 0;
            let mut l1 = l.clone();
            let mut l2 = l.clone();
            l1.0[i] = State::Ok;
            l2.0[i] = State::Nok;
            sum += rec(l1);
            sum += rec(l2);
            return sum;
        }
    }

    if is_valid(&l) {
        return 1;
    } else {
        return 0;
    }
}

fn is_valid(l: &Line) -> bool {
    let mut a: Vec<usize> = Vec::new();

    let mut prev = State::Ok;
    let mut count = 0;

    for i in 0..l.0.len() {
        if l.0[i] == State::Nok {
            count += 1;
        } else if l.0[i] == State::Ok && prev == State::Nok {
            a.push(count);
            count = 0;
        }
        prev = l.0[i];
    }
    if count != 0 {
        a.push(count);
    }

    let ret = a == l.1;
    ret
}

fn rec2(mut s: &[State], mut arr: &[usize], depth: u32) -> usize {
    // println!("{} {:?} {:?}", depth, s, arr);

    if arr.len() == 0 {
        // println!("ret 1");
        return 1;
    }
    if s.len() == 0 {
        // println!("ret 0");
        return 0;
    }

    if s.len() < arr.iter().fold(0, |x, y| x + y) + arr.len() - 1 {
        // println!("ret 0");
        return 0;
    }

    let n = arr[0];
    let arr = &arr[1..];

    let mut ret = 0;
    for i in 0..(s.len() - n) {
        let mut all = true;
        // check before first #
        for ii in 0..i {
            if s[ii] == State::Nok {
                all = false;
            }
        }
        // check if # * n
        for ii in 0..n {
            if s[i + ii] == State::Ok {
                all = false;
            }
        }
        // check if next is not #
        if s[i + n] == State::Nok {
            all = false;
        }

        if all {
            ret += rec2(&s[i + n + 1..], arr, depth + 1);
        }
    }
    if s.len() == n {
        let mut all = true;
        for ii in 0..n {
            if s[ii] == State::Ok {
                all = false;
            }
        }
        if all {
            // println!("ret 1");
            return 1;
        }
    }

    // handle last digit and last place
    if arr.len() == 0 {
        let mut all = true;
        for i in 0..(s.len() - n) {
            // check before first #
            if s[i] == State::Nok {
                all = false;
            }
        }
        for i in (s.len() - n)..s.len() {
            // check if # * n
            if s[i] == State::Ok {
                all = false;
            }
        }
        if all {
            ret += 1;
        }
    }

    ret
}

fn main() {
    let filename = "in/day12.ref";
    // let filename = "in/day12.pzl";

    let mut f = File::open(filename).expect("cannot open file");
    let mut content = String::new();
    f.read_to_string(&mut content).expect("cannot read file");
    let lines = content.trim_end().split('\n');

    let mut ls: Vec<Line> = Vec::new();
    for line in lines {
        let (a, b) = line.split_once(' ').unwrap();
        let mut l: Line = (Vec::new(), Vec::new());
        for c in a.chars() {
            let s = match c {
                '.' => State::Ok,
                '#' => State::Nok,
                '?' => State::Unk,
                _ => panic!(),
            };
            l.0.push(s);
        }
        for c in b.split(',') {
            l.1.push(c.parse().unwrap());
        }
        ls.push(l);
    }

    let mut res1 = 0;
    let mut res2 = 0;

    // for l in ls {
    //     let a = rec(l);
    //     // println!("{}", a);
    //     res1 += a;
    // }

    let mut ls2: Vec<Line> = Vec::new();
    for i in 0..ls.len() {
        let mut l2: Line = Default::default();
        for _ in 0..5 {
            l2.0.append(&mut ls[i].0.clone());
            l2.0.push(State::Unk);
            l2.1.append(&mut ls[i].1.clone());
        }
        ls2.push(l2);
    }

    // for l in [ls2[0].clone()] {
    // for l in [ls[5].clone()] {
    for l in ls2 {
        let a = rec2(&l.0, &l.1, 0);
        println!("{}", a);
        res2 += a;
    }

    println!("res1: {}", res1);
    println!("res2: {}", res2);
}