use aoc2019::*;
use std::io;
use std::io::prelude::*;
use std::process;
use structopt::StructOpt;

#[derive(Debug, StructOpt)]
#[structopt(name = "Day 21: Springdroid Adventure")]
/// Pilots a springdroid around!
///
/// See https://adventofcode.com/2019/day/21 for details.
struct Opt {}

fn main() {
    let stdin = io::stdin();
    let _opt = Opt::from_args();

    let program: IntcodeProgram = stdin
        .lock()
        .split(b',')
        .map(|x| exit_on_failed_assertion(x, "Error reading input"))
        .map(|x| exit_on_failed_assertion(String::from_utf8(x), "Input was not valid UTF-8"))
        .map(|x| exit_on_failed_assertion(x.trim().parse::<Intcode>(), "Invalid number"))
        .collect::<IntcodeProgram>();

    let walk_result = exit_on_failed_assertion(
        {
            let input = vec![
                "NOT T T\n",
                "AND A T\n",
                "AND B T\n",
                "AND C T\n",
                "NOT T J\n",
                "AND D J\n",
                "WALK\n",
            ];
            program
                .with_input(
                    input
                        .iter()
                        .flat_map(|line| line.chars().map(|c| Intcode::from(c as u8)))
                        .collect(),
                )
                .execute()
        },
        "Program failed",
    );

    println!(
        "{}",
        walk_result
            .drop_last()
            .unwrap()
            .iter()
            .flat_map(|c| c.to_signed_bytes_be())
            .map(|c| c as char)
            .collect::<String>()
    );
    println!("{}", walk_result.last().unwrap());

    let run_result = exit_on_failed_assertion(
        {
            // (!A || !B || !C) && D && (E || H)
            let input = vec![
                "OR E J\n",
                "OR H J\n",
                "AND D J\n",
                "NOT T T\n",
                "AND A T\n",
                "AND B T\n",
                "AND C T\n",
                "NOT T T\n",
                "AND T J\n",
                "RUN\n",
            ];
            program
                .with_input(
                    input
                        .iter()
                        .flat_map(|line| line.chars().map(|c| Intcode::from(c as u8)))
                        .collect(),
                )
                .execute()
        },
        "Program failed",
    );

    println!(
        "{}",
        run_result
            .drop_last()
            .unwrap()
            .iter()
            .flat_map(|c| c.to_signed_bytes_be())
            .map(|c| c as char)
            .collect::<String>()
    );
    println!("{}", run_result.last().unwrap());
}

fn exit_on_failed_assertion<A, E: std::error::Error>(data: Result<A, E>, message: &str) -> A {
    match data {
        Ok(data) => data,
        Err(e) => {
            eprintln!("{}: {}", message, e);
            process::exit(1);
        }
    }
}