use std::env;
use std::path::Path;
use std::fs;

fn main() {
	let args: Vec<String> = env::args().collect();
	if args.len() < 2 {
		println!("Invalid argumen!.\nCoba jalankan seperti ini: rename_book /tmp");
		std::process::exit(1);
	}

	let folder_name = &args[1];
	if !folder_exists(folder_name.to_string()) {
		println!("Path folder tidak ada/Invalid!.");
		std::process::exit(1);
	}

	if let Ok(files) = get_files(folder_name.to_string()) {
		for file in files {
			let paths = Path::new(&file);
			if !paths.is_file() {
				continue;
			}

			let fname = match paths.file_name() {
				Some(fname1) =>
					match fname1.to_str() {
						Some(name) => name,
						None => "",
					},
				None => "",
			};

			let ext = match paths.extension() {
				Some(val) => match val.to_str() {
					Some(item) => item,
					None => "",
				},
				None => "",
			};

			let parent = match paths.parent() {
				Some(name) => match name.to_str() {
					Some(val) => val,
					None => "",
				},
				None => "",
			};

			if ext == "rar" && fname.contains("Letmeread.net_") {
				let new_name = format!("{}/{}", parent.to_owned(), &fname.replace("Letmeread.net_", ""));
				let _ = fs::rename(&file, &new_name);
				println!("Merubah nama '{}' menjadi '{}'", file, new_name);
			}
		}
	}
}

fn folder_exists(name: String) -> bool {
	if name.trim() == "" {
		return false;
	}

	let dir = Path::new(&name);
	dir.exists()
}

fn get_files(dirname: String) -> std::io::Result<Vec<String>> {
	let mut res: Vec<String> = Vec::new();

	for entry in fs::read_dir(dirname)? {
		let dir = entry?;
		res.push(dir.path().display().to_string());
	}
	Ok(res)
}