// The SpellGrid command line, played from a script (the reference's own check; not a course test).
use std::cell::RefCell;
use std::io::{Cursor, Write};
use std::rc::Rc;

use engine::cli::{run, Outcome};

/// Collects what the CLI prints.
#[derive(Clone, Default)]
struct Screen(Rc<RefCell<Vec<u8>>>);

impl Write for Screen {
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        self.0.borrow_mut().extend_from_slice(buf);
        Ok(buf.len())
    }
    fn flush(&mut self) -> std::io::Result<()> {
        Ok(())
    }
}

fn play(level: &str, input: &[&str]) -> (Outcome, String) {
    let screen = Screen::default();
    let input = Box::new(Cursor::new(input.join("\n") + "\n"));
    let outcome = run(level, input, Box::new(screen.clone()));
    let out = String::from_utf8(screen.0.borrow().clone()).unwrap();
    (outcome, out)
}

#[test]
fn cli_wins_level_1() {
    let input = ["w", "w", "c Whirlwind", "s", "s", "a", "s", "s", "d", "d"];
    let (outcome, out) = play(include_str!("../levels/l1-double-tap.json"), &input);
    assert_eq!(outcome, Outcome::Won);
    assert!(out.contains("DEA IS  DOU"));
    assert!(out.contains("You win!"));
}

#[test]
fn cli_wins_level_2_with_choices_and_play() {
    let input = [
        "c Graft",
        "Ember Moth",
        "Rune Scribe",
        "bottom",
        "c Ember Moth (Assembled) 4 3",
        "a",
        "a",
    ];
    let (outcome, out) = play(include_str!("../levels/l2-spliced-corpse.json"), &input);
    assert_eq!(outcome, Outcome::Won);
    assert!(out.contains("Choose the base"));
    assert!(out.contains("Hand: Ember Moth (Assembled)"));
}

#[test]
fn cli_prints_the_log_tree_of_each_command() {
    let level = include_str!("../levels/l1-double-tap.json");
    let (_, out) = play(level, &["w", "w", "c Whirlwind", "q"]);
    // The moves run no Sequence, so only the cast prints a log: its tree, Deathrattles nested.
    assert_eq!(out.matches("Log:\n").count(), 1, "{out}");
    let tree = [
        "Log:",
        "SpellCast{card: \"Whirlwind\"}",
        "Damaged{target: 32, amount: 1}",
        "Damaged{target: 33, amount: 1}",
        "Destroyed{id: 32}",
        "DeathPhase{round: 1}",
        "Triggered{source: 32, trigger: \"deathrattle\"}",
        "  Damaged{target: 33, amount: 1}",
        "Triggered{source: 32, trigger: \"deathrattle\"}",
        "  Damaged{target: 33, amount: 1}",
        "Destroyed{id: 33}",
        "DeathPhase{round: 2}",
        "",
    ];
    assert!(out.contains(&tree.join("\n")), "{out}");
}

#[test]
fn cli_reports_errors_and_quits() {
    let input = ["c Spark", "x", "q"];
    let (outcome, out) = play(
        include_str!("../levels/l3-simultaneous-paradox.json"),
        &input,
    );
    assert_eq!(outcome, Outcome::Quit);
    assert!(out.contains("\"Spark\" is not in the hand"));
    assert!(out.contains("Commands:"));
}

// The two reference CLIs print the same text for the same input (tools/diff-tracks.mjs checks it).
#[test]
fn cli_prints_card_names_as_typed() {
    let level = include_str!("../levels/l3-simultaneous-paradox.json");
    let (_, out) = play(level, &["c a\"b", "q"]);
    assert!(out.contains("\"a\"b\" is not in the hand"), "{out}");
}

#[test]
fn cli_numbers_are_plain_digits() {
    // "-1" is not a coordinate, so it is part of the card's name.
    let level = include_str!("../levels/l1-double-tap.json");
    let (_, out) = play(level, &["c Whirlwind -1 0", "q"]);
    assert!(
        out.contains("\"Whirlwind -1 0\" is not in the hand"),
        "{out}"
    );
    // "+2" is not a number, so the chooser takes the first option.
    let level = include_str!("../levels/l2-spliced-corpse.json");
    let (_, out) = play(level, &["c Graft", "+2", "1", "1", "q"]);
    assert!(out.contains("Hand: Ember Moth (Assembled)"), "{out}");
}