use std::path::Path;
use fs_extra::dir::CopyOptions;

// Learn more about Tauri commands at https://tauri.app/develop/calling-rust/
#[tauri::command]
fn greet(name: &str) -> String {
    format!("Hello, {}! You've been greeted from Rust!", name)
}

#[tauri::command]
fn copy_directory(template_path: String, target_path: String, new_folder_name: String) -> Result<String, String> {
    let template = Path::new(&template_path);
    let target_parent = Path::new(&target_path);
    let destination = target_parent.join(&new_folder_name);

    if !template.exists() {
        return Err("Template directory does not exist".to_string());
    }
    
    if destination.exists() {
        return Err(format!("Destination directory already exists: {:?}", destination));
    }

    // Create the destination directory first
    std::fs::create_dir_all(&destination).map_err(|e| e.to_string())?;

    let mut options = CopyOptions::new();
    options.content_only = true; 
    
    fs_extra::dir::copy(template, &destination, &options)
        .map_err(|e| e.to_string())?;

    Ok(destination.to_string_lossy().to_string())
}

#[cfg_attr(mobile, tauri::mobile_entry_point)]
pub fn run() {
    tauri::Builder::default()
        .plugin(tauri_plugin_opener::init())
        .plugin(tauri_plugin_dialog::init())
        .invoke_handler(tauri::generate_handler![greet, copy_directory])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
}