use std::cell::RefCell;
use std::io::stdin;
use std::path::PathBuf;
use std::rc::Rc;

use rlox2_frontend::lexer::TokenType;
use rlox2_interpreter::{run, Runtime};

#[cfg(test)]
pub fn run_test(path: impl Into<PathBuf>) {
    use smol_str::SmolStr;

    let path = &path.into();
    // path.insert_str(0, "./tests/lox/");

    let source = std::fs::read_to_string(path).unwrap();

    let tokens = rlox2_frontend::lexer::scan_tokens(&source).unwrap();

    let comments: Result<Vec<String>, SmolStr> =
        tokens.into_iter().try_fold(Vec::new(), |mut acc, token| {
            if let TokenType::Comment(s) = token.token_type {
                if s.contains("Error") || s.contains("error") {
                    return Err(s);
                } else if s.starts_with(" expect: ") {
                    acc.push(s.trim().strip_prefix("expect:").unwrap().trim().to_owned());
                }
            }

            Ok(acc)
        });

    match comments {
        Ok(ref comments) => {
            println!("Expecting positive result");
            for comment in comments.iter() {
                println!("Comment: \"{comment}\"")
            }
        }
        Err(ref e) => {
            println!("Expecting error: {e}");
        }
    }

    print!("\n\n");

    let output: Vec<u8> = Vec::new();
    let output = Rc::new(RefCell::new(output));

    {
        let output = Rc::clone(&output);

        let mut runtime = Runtime::new(Rc::new(RefCell::new(stdin())), output);

        match run(&source, &mut runtime) {
            Ok(()) => (),
            Err(e) => {
                println!("{e}");

                assert!(comments.is_err());

                return;
            }
        }
    }

    let Ok(comments) = comments else {
        panic!("Positive outcome, but expected error");
    };

    let mut output = output.as_ref().borrow_mut();
    let output = String::from_utf8(std::mem::take(&mut *output)).unwrap();

    println!("output: len = {}\n---", output.len());
    println!("{output}");
    println!("---");

    let lines: Vec<String> = output
        .split_terminator('\n')
        .map(|s| s.to_owned())
        .collect();

    assert_eq!(
        lines.len(),
        comments.len(),
        "Didn't get as many outputs as expected"
    );

    for (line, comment) in std::iter::zip(lines.into_iter(), comments.into_iter()) {
        assert_eq!(line, comment);
    }
}

// #[test]
// fn run_all_tests() {
//     for lox_file in glob::glob("tests/lox/**/*.lox").unwrap() {
//         let lox_file = lox_file.unwrap();

//         print!("\n\n\n");
//         println!(
//             "================================================================================\n"
//         );
//         println!("Running test for file {}\n", lox_file.display());

//         run_test(lox_file);
//     }
// }