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

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

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

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

        let new_repo = path.exists();

        if fs::create_dir_all(&path).is_err() {
            bail!("Error while creating dir")
        };

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

        for folder in folders {
            fs::create_dir_all(path.join(folder))?;
        }

        let head = Head {
            ref_to: String::from("refs/heads/master"),
        };
        head.save()?;

        let canonical_path = path.canonicalize();

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