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/// Slightly modified from https://github.com/Brooooooklyn/napi-rs/blob/master/build/src/lib.rs
/// configure linker to generate node.js dynamic library
#[cfg(windows)]
pub fn configure() {
        
    // On Windows, we need to download the dynamic library from the nodejs.org website first
    use std::env::var;
    use std::fs::File;
    use std::io::copy;
    use std::path::PathBuf;
    use std::process::Command;

    let node_full_version = String::from_utf8(Command::new("node").arg("-v").output().unwrap().stdout).unwrap();
        
    let temp_dir =   PathBuf::from("C:\\Windows\\Temp\\");
    let mut temp_lib =   temp_dir.clone();
    
    temp_lib.push(format!("node-{}.lib", node_full_version.trim_end()));

    if !temp_lib.exists() {
        let lib_file_download_url = format!(
            "https://nodejs.org/dist/{}/win-x64/node.lib",
            node_full_version
        );
        let mut resp =
            reqwest::blocking::get(&lib_file_download_url).expect("Download node.lib file failed");
        let mut node_lib_file = File::create(&temp_lib).unwrap();
        copy(&mut resp, &mut node_lib_file).expect("Save node.lib file failed");
    }


    println!("cargo:rustc-link-lib={}",&temp_lib.file_stem().unwrap().to_str().unwrap());
    println!("cargo:rustc-link-search={}", temp_dir.to_str().unwrap());
    // Link `win_delay_load_hook.obj` for windows electron
    let node_runtime_env = "npm_config_runtime";
    println!("cargo:rerun-if-env-changed={}", node_runtime_env);
    if var(node_runtime_env).map(|s| s == "electron") == Ok(true) {
        println!("cargo:rustc-cdylib-link-arg=win_delay_load_hook.obj");
        println!("cargo:rustc-cdylib-link-arg=delayimp.lib");
        println!("cargo:rustc-cdylib-link-arg=/DELAYLOAD:node.exe");
    }
}

#[cfg(unix)]
pub fn configure() {
    if cfg!(target_os = "macos") {
        // Set up the build environment by setting Cargo configuration variables.
        println!("cargo:rustc-cdylib-link-arg=-undefined");
        println!("cargo:rustc-cdylib-link-arg=dynamic_lookup");
    }

    // On Linux, no additional configuration is needed
}