use std::{fmt::format, io::Write};

pub enum Options {
    Build,
    Clean,
    New,
    Run,
}

fn main() {
    let mut args: Vec<String> = std::env::args().collect();
    args.remove(0);
    args.reverse();

    let binding = args.pop().unwrap_or("help".to_string());
    let subcommand = binding.as_str();

    match subcommand {
        "build" => {
            let name = &args[1];
            build(name.to_string())
        }
        "new" => {
            let binding = args.pop().unwrap();
            let dev_type = binding.as_str();
            let name = args.pop().unwrap();
            match dev_type {
                "lib" | "library" => new(true, name),
                "prog" | "program" => new(false, name),
                _ => {}
            };
        }
        "run" => run(),

        "help" => {
            // println!("This is the help message.");
            // println!("A prototype build tool meant to help with ableOS software development.");
            help()
        }
        _ => {
            println!("Error");
        }
    }
}

pub fn new(library: bool, name: String) {
    let (folder_hierarchy, entry_name) = match library {
        true => ("libraries", "lib.hb"),
        false => ("programs", "main.hb"),
    };
    let project_folder_path_string = format!("sysdata/{folder_hierarchy}/{name}");

    if std::path::Path::new(&project_folder_path_string).exists() {
        panic!("Project already exists.")
    }

    std::fs::create_dir(project_folder_path_string.clone()).unwrap();
    let readme_path_string = format!("{}/README.md", project_folder_path_string);
    let mut readme_file = std::fs::File::create(readme_path_string.clone()).unwrap();

    let readme_contents = format!("# {}", name);
    readme_file.write_all(readme_contents.as_bytes()).unwrap();

    let src_folder_path_string = format!("{}/src", project_folder_path_string);
    std::fs::create_dir(src_folder_path_string.clone()).unwrap();

    let full_path_string = format!("{src_folder_path_string}/{entry_name}");
    let mut file = std::fs::File::create(full_path_string.clone()).unwrap();
    let file_contents = if library {
        ""
    } else {
        "main := fn(): int {
    return 0
}"
    }
    .to_string();
    file.write_all(file_contents.as_bytes()).unwrap();

    println!("{}", full_path_string);
}

fn run() {
    println!("Running is not supported on a non-ableOS platform");
}

fn build(name: String) {
    println!("building {}", name);
}

fn help() {
    println!(
        "==========
=  Help  =
==========
Subcommands
- new  Usage: `cargo dev new library name` or `cargo dev new program name`"
    )
}