use std::path::PathBuf;

use clap::{Args, Parser, Subcommand};
use gix_discover::repository::Path;

#[derive(Debug, Parser)]
#[command(version, about)]
#[command(propagate_version = true)]
pub struct Cli {
    #[command(flatten)]
    pub global_opts: GlobalOpts,

    #[command(subcommand)]
    pub command: Commands,
}

fn path_is_repo(path: &str) -> Result<PathBuf, String> {
    let path = PathBuf::from(path);
    let (repo, _trust) = gix_discover::upwards(&path).map_err(|err| err.to_string())?;

    let work_dir = match repo {
        Path::LinkedWorkTree { work_dir, .. } => work_dir,
        Path::WorkTree(work_dir) => work_dir,
        Path::Repository(git_dir) => {
            return Err(format!(
                "Repo '{}' has no working directory",
                git_dir.to_string_lossy()
            ));
        }
    };

    Ok(work_dir)
}

#[derive(Debug, Args)]
pub struct GlobalOpts {
    #[arg(global = true, short, long, action = clap::ArgAction::Count)]
    /// Use verbose output
    pub verbose: u8,

    #[arg(global = true, short, long, value_parser = path_is_repo, default_value_os_t = PathBuf::from("."))]
    /// Path to the repo containing the config files
    pub repo: PathBuf,
}

#[derive(Debug, Subcommand)]
pub enum Commands {
    /// Generate talos config file
    Generate,
    /// Generate completions for your current shell
    ShellCompletions,
}