use clap::Parser;
use std::{
    fs,
    path::Path
};

use crate::git_fs::head::Head;
use crate::subcommands::Subcommand;
use crate::GIT_DIR;

use super::CmdResult;

#[derive(Parser, Debug)]
pub struct InitSubcommand {
    directory: Option<String>,
}

impl Subcommand for InitSubcommand {
    fn run(&self) -> CmdResult {
        let path = match &self.directory {
            None => Path::new("."),
            Some(path) => Path::new(path),
        }.join(GIT_DIR);

        let new_repo = path.exists();

        match fs::create_dir_all(&path) {
            Err(_) => return Err("Error while creating dir".to_owned()),
            Ok(()) => (),
        };

        let folders = [
            "objects/info",
            "objects/pack",
            "refs/heads",
            "refs/tags",
        ];

        for folder in folders {
            match fs::create_dir_all(&path.join(folder)) {
                Err(_) => return Err("".to_owned()),
                Ok(()) => (),
            };
        }

        let head = Head { ref_to: String::from("refs/heads/master") };
        match head.save() {
            Err(_) => return Err("".to_owned()),
            Ok(()) => (),
        };

        let canonical_path = path.canonicalize();

        if new_repo {
            Ok(format!("Reinitialized exisiting Git repo in {}", canonical_path.unwrap().display()))
        } else {
            Ok(format!("Initialized empty Git repo in {}", canonical_path.unwrap().display()))
        }
    }
}