use rhai::{Engine, EvalAltResult};
use std::fs;
use std::path::Path;

/// Helper function to create a Rhai engine for service manager testing
fn create_service_manager_engine() -> Result<Engine, Box<EvalAltResult>> {
    let engine = Engine::new();

    // Register any custom functions that would be needed for service manager integration
    // For now, we'll keep it simple since the actual service manager integration
    // would require more complex setup

    Ok(engine)
}

/// Helper function to run a Rhai script file
fn run_rhai_script(script_path: &str) -> Result<rhai::Dynamic, Box<EvalAltResult>> {
    let engine = create_service_manager_engine()?;

    // Read the script file
    let script_content = fs::read_to_string(script_path)
        .map_err(|e| format!("Failed to read script file {}: {}", script_path, e))?;

    // Execute the script
    engine.eval::<rhai::Dynamic>(&script_content)
}

#[test]
fn test_rhai_service_manager_basic() {
    let script_path = "tests/rhai/service_manager_basic.rhai";

    if !Path::new(script_path).exists() {
        println!("⚠ Skipping test: Rhai script not found at {}", script_path);
        return;
    }

    println!("Running Rhai service manager basic test...");

    match run_rhai_script(script_path) {
        Ok(result) => {
            println!("✓ Rhai basic test completed successfully");

            // Try to extract test results if the script returns them
            if let Some(map) = result.try_cast::<rhai::Map>() {
                println!("Test results received from Rhai script:");
                for (key, value) in map.iter() {
                    println!("  {}: {:?}", key, value);
                }

                // Check if all tests passed
                let all_passed = map.values().all(|v| {
                    if let Some(s) = v.clone().try_cast::<String>() {
                        s == "PASS"
                    } else {
                        false
                    }
                });

                if all_passed {
                    println!("✓ All Rhai tests reported as PASS");
                } else {
                    println!("⚠ Some Rhai tests did not pass");
                }
            }
        }
        Err(e) => {
            println!("✗ Rhai basic test failed: {}", e);
            panic!("Rhai script execution failed");
        }
    }
}

#[test]
fn test_rhai_service_lifecycle() {
    let script_path = "tests/rhai/service_lifecycle.rhai";

    if !Path::new(script_path).exists() {
        println!("⚠ Skipping test: Rhai script not found at {}", script_path);
        return;
    }

    println!("Running Rhai service lifecycle test...");

    match run_rhai_script(script_path) {
        Ok(result) => {
            println!("✓ Rhai lifecycle test completed successfully");

            // Try to extract test results if the script returns them
            if let Some(map) = result.try_cast::<rhai::Map>() {
                println!("Lifecycle test results received from Rhai script:");

                // Extract summary if available
                if let Some(summary) = map.get("summary") {
                    if let Some(summary_map) = summary.clone().try_cast::<rhai::Map>() {
                        println!("Summary:");
                        for (key, value) in summary_map.iter() {
                            println!("  {}: {:?}", key, value);
                        }
                    }
                }

                // Extract performance metrics if available
                if let Some(performance) = map.get("performance") {
                    if let Some(perf_map) = performance.clone().try_cast::<rhai::Map>() {
                        println!("Performance:");
                        for (key, value) in perf_map.iter() {
                            println!("  {}: {:?}", key, value);
                        }
                    }
                }
            }
        }
        Err(e) => {
            println!("✗ Rhai lifecycle test failed: {}", e);
            panic!("Rhai script execution failed");
        }
    }
}

#[test]
fn test_rhai_engine_functionality() {
    println!("Testing basic Rhai engine functionality...");

    let engine = create_service_manager_engine().expect("Failed to create Rhai engine");

    // Test basic Rhai functionality
    let test_script = r#"
        let test_results = #{
            basic_math: 2 + 2 == 4,
            string_ops: "hello".len() == 5,
            array_ops: [1, 2, 3].len() == 3,
            map_ops: #{ a: 1, b: 2 }.len() == 2
        };
        
        let all_passed = true;
        for result in test_results.values() {
            if !result {
                all_passed = false;
                break;
            }
        }
        
        #{
            results: test_results,
            all_passed: all_passed
        }
    "#;

    match engine.eval::<rhai::Dynamic>(test_script) {
        Ok(result) => {
            if let Some(map) = result.try_cast::<rhai::Map>() {
                if let Some(all_passed) = map.get("all_passed") {
                    if let Some(passed) = all_passed.clone().try_cast::<bool>() {
                        if passed {
                            println!("✓ All basic Rhai functionality tests passed");
                        } else {
                            println!("✗ Some basic Rhai functionality tests failed");
                            panic!("Basic Rhai tests failed");
                        }
                    }
                }

                if let Some(results) = map.get("results") {
                    if let Some(results_map) = results.clone().try_cast::<rhai::Map>() {
                        println!("Detailed results:");
                        for (test_name, result) in results_map.iter() {
                            let status = if let Some(passed) = result.clone().try_cast::<bool>() {
                                if passed {
                                    "✓"
                                } else {
                                    "✗"
                                }
                            } else {
                                "?"
                            };
                            println!("  {} {}: {:?}", status, test_name, result);
                        }
                    }
                }
            }
        }
        Err(e) => {
            println!("✗ Basic Rhai functionality test failed: {}", e);
            panic!("Basic Rhai test failed");
        }
    }
}

#[test]
fn test_rhai_script_error_handling() {
    println!("Testing Rhai error handling...");

    let engine = create_service_manager_engine().expect("Failed to create Rhai engine");

    // Test script with intentional error
    let error_script = r#"
        let result = "test";
        result.non_existent_method(); // This should cause an error
    "#;

    match engine.eval::<rhai::Dynamic>(error_script) {
        Ok(_) => {
            println!("⚠ Expected error but script succeeded");
            panic!("Error handling test failed - expected error but got success");
        }
        Err(e) => {
            println!("✓ Error correctly caught: {}", e);
            // Verify it's the expected type of error
            assert!(e.to_string().contains("method") || e.to_string().contains("function"));
        }
    }
}

#[test]
fn test_rhai_script_files_exist() {
    println!("Checking that Rhai test scripts exist...");

    let script_files = [
        "tests/rhai/service_manager_basic.rhai",
        "tests/rhai/service_lifecycle.rhai",
    ];

    for script_file in &script_files {
        if Path::new(script_file).exists() {
            println!("✓ Found script: {}", script_file);

            // Verify the file is readable and not empty
            match fs::read_to_string(script_file) {
                Ok(content) => {
                    if content.trim().is_empty() {
                        panic!("Script file {} is empty", script_file);
                    }
                    println!("  Content length: {} characters", content.len());
                }
                Err(e) => {
                    panic!("Failed to read script file {}: {}", script_file, e);
                }
            }
        } else {
            panic!("Required script file not found: {}", script_file);
        }
    }

    println!("✓ All required Rhai script files exist and are readable");
}