use crate::tera_integration::RhaiTeraIntegration;
use std::collections::HashMap;
use rhai::Dynamic;

/// Test the dynamic loading of Rhai scripts and functions
pub fn test_dynamic_loading() -> Result<(), String> {
    println!("\n=== TESTING DYNAMIC FUNCTION LOADING ===\n");
    
    // Create a new RhaiTeraIntegration
    let mut integration = RhaiTeraIntegration::new();
    
    println!("Loading Rhai scripts...");
    
    // Load the original scripts
    integration.load_script("string_utils", "src/tera_integration/scripts/string_utils.rhai")?;
    integration.load_script("math_utils", "src/tera_integration/scripts/math_utils.rhai")?;
    
    // Load the new test script (which wasn't in the original hardcoded lists)
    integration.load_script("test_utils", "src/tera_integration/scripts/test_utils.rhai")?;
    
    // Get function names
    let function_names = integration.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 original string utils functions
    test_function(&integration, "string_utils:capitalize", vec![Dynamic::from("hello world")])?;
    
    // Test original math utils functions
    test_function(&integration, "math_utils:format_number", vec![Dynamic::from(1234567)])?;
    
    // Test new functions from test_utils
    test_function(&integration, "test_utils:reverse_string", vec![Dynamic::from("hello world")])?;
    
    test_function(&integration, "test_utils:count_words", 
        vec![Dynamic::from("this is a test sentence")])?;
    
    test_function(&integration, "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(integration: &RhaiTeraIntegration, name: &str, args: Vec<Dynamic>) -> Result<(), String> {
    let result = integration.call_function(name, args)?;
    println!("  {}() => {}", name, result);
    Ok(())
}