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use std::{
    env::{self, current_exe},
    path::{Path, PathBuf},
};

/// Converts a path relative to assets directory to an absolute path.
///
/// If the game is executed with Cargo, the path is interpreted as relative to
/// assets/ directory in the directory with Cargo manifest file.
///
/// Otherwise, it is interpreted as relative to assets/ directory in the
/// directory with the binary.
///
/// # Panics
///
/// Panics if `path` is not relative.
pub fn asset_path<P: AsRef<Path>>(path: P) -> PathBuf {
    let path = path.as_ref();
    assert!(path.is_relative(), "Asset path is not relative: {path:?}");
    let mut new_path = match env::var("CARGO_MANIFEST_DIR") {
        Ok(path) => PathBuf::from(path),
        Err(_) => current_exe()
            .expect("Failed to retrieve current executable path during map loading")
            .parent()
            .unwrap()
            .to_path_buf(),
    };
    new_path.push("assets");
    new_path.push(path);
    new_path
}