use std::collections::HashMap;
use rhai::Dynamic;
use rhai_engine::ScriptManager;
use std::path::Path;

/// Test the dynamic loading of Rhai scripts and functions
pub fn main() -> Result<(), String> {
    println!("\n=== TESTING DYNAMIC FUNCTION LOADING ===\n");
    
    // Create a new ScriptManager
    let mut script_manager = ScriptManager::new();
    
    println!("Loading Rhai scripts from scripts directory...");
    
    // Get the scripts directory path
    let scripts_dir = Path::new("rhai_engine/examples/loadscripts/scripts");
    
    // Use the ScriptManager to load all scripts from the directory
    let loaded_scripts = script_manager.load_scripts_from_directory(scripts_dir)?;
    
    // Print loaded scripts
    println!("\nLoaded scripts:");
    for script in &loaded_scripts {
        println!("  - {}", script);
    }
    
    // Get all available functions using the get_function_names method
    let function_names = script_manager.get_function_names();
    
    // Print all available functions
    println!("\nAll available functions:");
    for name in &function_names {
        println!("  - {}", name);
    }
    
    // Group functions by their script prefix to display nicely
    let scripts = group_functions_by_script(&function_names);
    
    // Display functions by script
    display_functions_by_script(&scripts);
        
    // Test some functions from each script
    println!("\nDynamic function testing:");
    
    // Test string_utils functions
    test_function(&script_manager, "string_utils:capitalize", vec![Dynamic::from("hello world")])?;
    
    // Test math_utils functions
    test_function(&script_manager, "math_utils:format_number", vec![Dynamic::from(1234567)])?;
    
    // Test test_utils functions
    test_function(&script_manager, "test_utils:reverse_string", vec![Dynamic::from("hello world")])?;
    
    test_function(&script_manager, "test_utils:count_words", 
        vec![Dynamic::from("this is a test sentence")])?;
    
    test_function(&script_manager, "test_utils:factorial", 
        vec![Dynamic::from(5)])?;
    
    println!("\n=== DYNAMIC FUNCTION LOADING TEST COMPLETE ===\n");
    
    Ok(())
}

// Helper function to group functions by script
fn group_functions_by_script(function_names: &[String]) -> HashMap<String, Vec<String>> {
    let mut scripts = HashMap::new();
    
    for name in function_names {
        let parts: Vec<&str> = name.split(':').collect();
        if parts.len() == 2 {
            let script = parts[0].to_string();
            let func = parts[1].to_string();
            
            scripts.entry(script).or_insert_with(Vec::new).push(func);
        }
    }
    
    scripts
}

// Helper function to display functions grouped by script
fn display_functions_by_script(scripts: &HashMap<String, Vec<String>>) {
    println!("\nFunctions by script:");
    
    for (script, funcs) in scripts {
        println!("  {}:", script);
        for func in funcs {
            println!("    - {}", func);
        }
    }
}

// Helper function to test a function and display its result
fn test_function(script_manager: &ScriptManager, name: &str, args: Vec<Dynamic>) -> Result<(), String> {
    let result = script_manager.call_function(name, args)?;
    println!("  {}() => {}", name, result);
    Ok(())
}