use std::{env, fs, path::Path};

#[cfg(debug_assertions)]
const CONFIG: &str = "debug";
#[cfg(not(debug_assertions))]
const CONFIG: &str = "release";

#[cfg(target_os = "macos")]
const OS_LIB_EXT: &str = "dylib";
#[cfg(target_os = "windows")]
const OS_LIB_EXT: &str = "dll";
#[cfg(target_os = "linux")]
const OS_LIB_EXT: &str = "so";

#[cfg(target_os = "macos")]
const OS_NAME: &str = "macOS";
#[cfg(target_os = "windows")]
const OS_NAME: &str = "Windows";
#[cfg(target_os = "linux")]
const OS_NAME: &str = "Linux";

fn get_output_lib_name(lib_name: &str) -> &'static str {
    match lib_name {
        "airfreshener" => "AirFreshener",
        _ => "Unknown",
    }
}

fn main() {
    let target_dir = Path::new(&env::var("CARGO_MANIFEST_DIR").unwrap_or("".to_owned()))
        .join(format!("target/{CONFIG}"));
    let artifact_dir = target_dir.join("deps/artifact");

    let artifact_dirs =
        fs::read_dir(artifact_dir).expect("Failed to read build artifact directory");
    for dir_result in artifact_dirs {
        if let Ok(dir) = dir_result {
            if let Some(lib_name) = dir.file_name().to_string_lossy().split('-').next() {
                let lib_path = dir
                    .path()
                    .join(format!("cdylib/lib{lib_name}.{OS_LIB_EXT}"));
                if fs::exists(&lib_path).unwrap_or_default() {
                    let out_lib_name = get_output_lib_name(lib_name);
                    let out_lib_path = target_dir.join(format!("{out_lib_name}_{OS_NAME}.clap"));
                    if let Err(err) = fs::copy(&lib_path, &out_lib_path) {
                        println!(
                            "cargo::error=Output library lib{lib_name:?}.{OS_LIB_EXT} could not be copied to target: {err}"
                        );
                    }
                } else {
                    println!("cargo::error=Output library lib{lib_name:?}.{OS_LIB_EXT} not found");
                }
            }
        }
    }
}