use std::path::{ Path, PathBuf };

use pico_args::Arguments;

//	- HELPER -
const DRIVE: &str = "/mnt/c/";

//	- ENV -
const DISTRO: &str = "WSL_DISTRO_NAME";

//	- FLAGS -
const HELP:			[&str;2]	= [ "-h", "--help" ];
const NET_PATH:		[&str;2]	= [ "-n", "--network" ];
const NO_SPACES:	[&str;2]	= [ "-s", "--no-space" ];
const QUOTED:		[&str;2]	= [ "-q", "--quotes" ];

pub fn main() {
	let mut args = Arguments::from_env();

	//	handle help flag
	if args.contains(HELP) {
		help_text();
		return;
	}

	//	handle quote flag
	let quotes: &str =
	if args.contains(QUOTED) {
		if args.contains(QUOTED) { "\"" }	//	-qq	-> "..."	(output with double quotes)
		else { "'" }						//	-q	-> '...'	(output with single quotes)
	} else { "" };							//	_	-> ...		(output with no quotes)

	//	consume simple flags
	let no_spaces = args.contains(NO_SPACES);
	let network_path = args.contains(NET_PATH);

	loop {
		let next = args.subcommand().unwrap();
		if let Some(arg) = next {
			let mut output: String;
			//	canonicalize; windows doesn't recognize symlinks
			let path = Path::new(&arg).canonicalize();
			if let Ok(target) = path {
				output = target.to_string_lossy().to_string();
			} else {
				output = arg;
			}

			//	handle no-space flag
			if no_spaces {
				let tmp = output.clone();
				let parts = tmp.split('/');
				let mut current = PathBuf::new();
				current.push("/");
				for part in parts {
					if part.is_empty() { continue; }
					let space = part.chars().position(|c| c == ' ');
					let len = part.len();
					//	if space is found, use short version
					if let Some(index) = space {
						//	find cut point and make slice
						let cut = usize::min(len, index).min(6);
						let replace = &(part[..cut]);

						//	determine number for shortening
						let mut index = 0;
						let children = current.read_dir();
						if !children.is_ok() { continue; }

						for child in children.unwrap() {
							if let Ok(child) = child {
								let name: String = child.file_name().to_string_lossy().into();
								//	matches increment
								if name.to_lowercase().starts_with(&replace.to_lowercase()) { index += 1; }
								//	... and break when we hit the target
								if name == part { break; }
							}
						}
						output = output.replacen(part, &format!("{replace}~{index}"), 1);
					}
					current.push(part);
				}
			}

			//	simple C-drive substitution
			if output.starts_with(DRIVE) {
				output = output.replace(DRIVE, "C:\\");
			} else if network_path {
				let name = std::env::var(DISTRO);
				if let Ok(name) = name {
					output = format!("//wsl.localhost/{name}{output}");
				}
			}

			//	switch out separators
			output = output.replace("/", "\\");

			//	emit to stdout
			println!("{quotes}{output}{quotes}");
		} else {
			break;
		}
	}

}

pub fn help_text() {
	println!("path-convert v{}
Valerie Wolfe <sleeplessval@gmail.com>
Canonicalize and convert Unix paths for DOS programs.

usage: path-convert [flags] <paths...>

args:
	<paths...>       One or more paths to convert

flags:
	-h, --help       Show this help text
	-n, --network    Add the network path where appropriate
	-q, --quotes     Surround the output strings with quotes (-qq for double quotes)
	-s, --no-space   Don't allow paths to have spaces
", env!("CARGO_PKG_VERSION"));
}