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

use crate::cli::CONFIG;

use anyhow::{self, Context};

/// Generates a file path if one not provided.
/// root_path for fallback name.
pub fn get_path<P>(path: &Option<P>, root_path: &P, extension: &str) -> anyhow::Result<PathBuf>
where
    P: AsRef<Path>,
{
    if let Some(f) = path {
        return Ok(f.as_ref().to_path_buf());
    }

    Ok(PathBuf::from(format!(
        "{}.{}",
        root_path
            .as_ref()
            .to_str()
            .context("source_name path was not UTF-8 valid.")?,
        extension
    ))
    .as_path()
    .to_owned())
}

pub static MAP_PATH: LazyLock<PathBuf> = LazyLock::new(|| {
    get_path(&CONFIG.map, &CONFIG.input, "map")
        .context("Failed to generate map path.")
        .unwrap()
});

pub static OUTPUT_PATH: LazyLock<PathBuf> = LazyLock::new(|| {
    get_path(&CONFIG.output, &CONFIG.input, "iso")
        .context("Failed to generate output path.")
        .unwrap()
});