//! Rhai wrappers for Kubernetes module functions
//!
//! This module provides Rhai wrappers for the functions in the Kubernetes module,
//! enabling scripting access to Kubernetes operations.

use crate::{KubernetesError, KubernetesManager};
use once_cell::sync::Lazy;
use rhai::{Array, Dynamic, Engine, EvalAltResult, Map};
use std::sync::Mutex;
use tokio::runtime::Runtime;

// Global Tokio runtime for blocking async operations
static RUNTIME: Lazy<Mutex<Runtime>> =
    Lazy::new(|| Mutex::new(Runtime::new().expect("Failed to create Tokio runtime")));

/// Helper function to convert Rhai Map to HashMap for environment variables
///
/// # Arguments
///
/// * `rhai_map` - Rhai Map containing key-value pairs
///
/// # Returns
///
/// * `Option<std::collections::HashMap<String, String>>` - Converted HashMap or None if empty
fn convert_rhai_map_to_env_vars(
    rhai_map: Map,
) -> Option<std::collections::HashMap<String, String>> {
    if rhai_map.is_empty() {
        None
    } else {
        Some(
            rhai_map
                .into_iter()
                .map(|(k, v)| (k.to_string(), v.to_string()))
                .collect(),
        )
    }
}

/// Helper function to execute async operations with proper runtime handling
///
/// This uses a global runtime to ensure consistent async execution
fn execute_async<F, T>(future: F) -> Result<T, Box<EvalAltResult>>
where
    F: std::future::Future<Output = Result<T, KubernetesError>>,
{
    // Get the global runtime
    let rt = match RUNTIME.lock() {
        Ok(rt) => rt,
        Err(e) => {
            return Err(Box::new(EvalAltResult::ErrorRuntime(
                format!("Failed to acquire runtime lock: {e}").into(),
                rhai::Position::NONE,
            )));
        }
    };

    // Execute the future in a blocking manner
    rt.block_on(future).map_err(kubernetes_error_to_rhai_error)
}

/// Helper function for error conversion
fn kubernetes_error_to_rhai_error(error: KubernetesError) -> Box<EvalAltResult> {
    Box::new(EvalAltResult::ErrorRuntime(
        format!("Kubernetes error: {error}").into(),
        rhai::Position::NONE,
    ))
}

/// Register Kubernetes module functions with the Rhai engine
///
/// # Arguments
///
/// * `engine` - The Rhai engine to register the functions with
///
/// # Returns
///
/// * `Result<(), Box<EvalAltResult>>` - Ok if registration was successful, Err otherwise
pub fn register_kubernetes_module(engine: &mut Engine) -> Result<(), Box<EvalAltResult>> {
    // Register KubernetesManager type
    engine.register_type::<KubernetesManager>();

    // Register KubernetesManager constructor and methods
    engine.register_fn("kubernetes_manager_new", kubernetes_manager_new);
    engine.register_fn("namespace", kubernetes_manager_namespace);

    // Register resource listing functions
    engine.register_fn("pods_list", pods_list);
    engine.register_fn("services_list", services_list);
    engine.register_fn("deployments_list", deployments_list);
    engine.register_fn("configmaps_list", configmaps_list);
    engine.register_fn("secrets_list", secrets_list);
    engine.register_fn("namespaces_list", namespaces_list);

    // Register resource creation methods (object-oriented style)
    engine.register_fn("create_pod", pod_create);
    engine.register_fn("create_pod_with_env", pod_create_with_env);
    engine.register_fn("create_service", service_create);
    engine.register_fn("create_deployment", deployment_create);
    engine.register_fn("create_configmap", configmap_create);
    engine.register_fn("create_secret", secret_create);

    // Register resource get methods
    engine.register_fn("get_pod", pod_get);
    engine.register_fn("get_service", service_get);
    engine.register_fn("get_deployment", deployment_get);

    // Register resource management methods
    engine.register_fn("delete", delete);
    engine.register_fn("delete_pod", pod_delete);
    engine.register_fn("delete_service", service_delete);
    engine.register_fn("delete_deployment", deployment_delete);
    engine.register_fn("delete_configmap", configmap_delete);
    engine.register_fn("delete_secret", secret_delete);

    // Register namespace methods (object-oriented style)
    engine.register_fn("create_namespace", namespace_create);
    engine.register_fn("delete_namespace", namespace_delete);
    engine.register_fn("namespace_exists", namespace_exists);

    // Register utility functions
    engine.register_fn("resource_counts", resource_counts);

    // Register convenience functions
    engine.register_fn("deploy_application", deploy_application);

    Ok(())
}

// KubernetesManager constructor and methods
fn kubernetes_manager_new(namespace: String) -> Result<KubernetesManager, Box<EvalAltResult>> {
    execute_async(KubernetesManager::new(namespace))
}

fn kubernetes_manager_namespace(km: &mut KubernetesManager) -> String {
    km.namespace().to_string()
}

// Resource listing functions
fn pods_list(km: &mut KubernetesManager) -> Result<Array, Box<EvalAltResult>> {
    let pods = execute_async(km.pods_list())?;
    let pod_names: Array = pods
        .iter()
        .filter_map(|pod| pod.metadata.name.as_ref())
        .map(|name| Dynamic::from(name.clone()))
        .collect();
    Ok(pod_names)
}

fn services_list(km: &mut KubernetesManager) -> Result<Array, Box<EvalAltResult>> {
    let services = execute_async(km.services_list())?;
    let service_names: Array = services
        .iter()
        .filter_map(|service| service.metadata.name.as_ref())
        .map(|name| Dynamic::from(name.clone()))
        .collect();
    Ok(service_names)
}

fn deployments_list(km: &mut KubernetesManager) -> Result<Array, Box<EvalAltResult>> {
    let deployments = execute_async(km.deployments_list())?;
    let deployment_names: Array = deployments
        .iter()
        .filter_map(|deployment| deployment.metadata.name.as_ref())
        .map(|name| Dynamic::from(name.clone()))
        .collect();
    Ok(deployment_names)
}

fn configmaps_list(km: &mut KubernetesManager) -> Result<Array, Box<EvalAltResult>> {
    let configmaps = execute_async(km.configmaps_list())?;
    let configmap_names: Array = configmaps
        .iter()
        .filter_map(|configmap| configmap.metadata.name.as_ref())
        .map(|name| Dynamic::from(name.clone()))
        .collect();
    Ok(configmap_names)
}

fn secrets_list(km: &mut KubernetesManager) -> Result<Array, Box<EvalAltResult>> {
    let secrets = execute_async(km.secrets_list())?;
    let secret_names: Array = secrets
        .iter()
        .filter_map(|secret| secret.metadata.name.as_ref())
        .map(|name| Dynamic::from(name.clone()))
        .collect();
    Ok(secret_names)
}

// Resource creation functions
fn pod_create(
    km: &mut KubernetesManager,
    name: String,
    image: String,
    labels: Map,
) -> Result<String, Box<EvalAltResult>> {
    let labels_map: Option<std::collections::HashMap<String, String>> = if labels.is_empty() {
        None
    } else {
        Some(
            labels
                .into_iter()
                .map(|(k, v)| (k.to_string(), v.to_string()))
                .collect(),
        )
    };
    let pod = execute_async(km.pod_create(&name, &image, labels_map, None))?;
    Ok(pod.metadata.name.unwrap_or(name))
}

fn pod_create_with_env(
    km: &mut KubernetesManager,
    name: String,
    image: String,
    labels: Map,
    env_vars: Map,
) -> Result<String, Box<EvalAltResult>> {
    let labels_map: Option<std::collections::HashMap<String, String>> = if labels.is_empty() {
        None
    } else {
        Some(
            labels
                .into_iter()
                .map(|(k, v)| (k.to_string(), v.to_string()))
                .collect(),
        )
    };
    let env_vars_map = convert_rhai_map_to_env_vars(env_vars);
    let pod = execute_async(km.pod_create(&name, &image, labels_map, env_vars_map))?;
    Ok(pod.metadata.name.unwrap_or(name))
}

fn service_create(
    km: &mut KubernetesManager,
    name: String,
    selector: Map,
    port: i64,
    target_port: i64,
) -> Result<String, Box<EvalAltResult>> {
    let selector_map: std::collections::HashMap<String, String> = selector
        .into_iter()
        .map(|(k, v)| (k.to_string(), v.to_string()))
        .collect();
    let target_port_opt = if target_port == 0 {
        None
    } else {
        Some(target_port as i32)
    };
    let service =
        execute_async(km.service_create(&name, selector_map, port as i32, target_port_opt))?;
    Ok(service.metadata.name.unwrap_or(name))
}

fn deployment_create(
    km: &mut KubernetesManager,
    name: String,
    image: String,
    replicas: i64,
    labels: Map,
    env_vars: Map,
) -> Result<String, Box<EvalAltResult>> {
    let labels_map: Option<std::collections::HashMap<String, String>> = if labels.is_empty() {
        None
    } else {
        Some(
            labels
                .into_iter()
                .map(|(k, v)| (k.to_string(), v.to_string()))
                .collect(),
        )
    };
    let env_vars_map = convert_rhai_map_to_env_vars(env_vars);
    let deployment = execute_async(km.deployment_create(
        &name,
        &image,
        replicas as i32,
        labels_map,
        env_vars_map,
    ))?;
    Ok(deployment.metadata.name.unwrap_or(name))
}

fn configmap_create(
    km: &mut KubernetesManager,
    name: String,
    data: Map,
) -> Result<String, Box<EvalAltResult>> {
    let data_map: std::collections::HashMap<String, String> = data
        .into_iter()
        .map(|(k, v)| (k.to_string(), v.to_string()))
        .collect();
    let configmap = execute_async(km.configmap_create(&name, data_map))?;
    Ok(configmap.metadata.name.unwrap_or(name))
}

fn secret_create(
    km: &mut KubernetesManager,
    name: String,
    data: Map,
    secret_type: String,
) -> Result<String, Box<EvalAltResult>> {
    let data_map: std::collections::HashMap<String, String> = data
        .into_iter()
        .map(|(k, v)| (k.to_string(), v.to_string()))
        .collect();
    let secret_type_opt = if secret_type.is_empty() {
        None
    } else {
        Some(secret_type.as_str())
    };
    let secret = execute_async(km.secret_create(&name, data_map, secret_type_opt))?;
    Ok(secret.metadata.name.unwrap_or(name))
}

// Resource get functions
fn pod_get(km: &mut KubernetesManager, name: String) -> Result<String, Box<EvalAltResult>> {
    let pod = execute_async(km.pod_get(&name))?;
    Ok(pod.metadata.name.unwrap_or(name))
}

fn service_get(km: &mut KubernetesManager, name: String) -> Result<String, Box<EvalAltResult>> {
    let service = execute_async(km.service_get(&name))?;
    Ok(service.metadata.name.unwrap_or(name))
}

fn deployment_get(km: &mut KubernetesManager, name: String) -> Result<String, Box<EvalAltResult>> {
    let deployment = execute_async(km.deployment_get(&name))?;
    Ok(deployment.metadata.name.unwrap_or(name))
}

// Resource deletion functions
fn delete(km: &mut KubernetesManager, pattern: String) -> Result<i64, Box<EvalAltResult>> {
    let deleted_count = execute_async(km.delete(&pattern))?;
    Ok(deleted_count as i64)
}

fn pod_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.pod_delete(&name))
}

fn service_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.service_delete(&name))
}

fn deployment_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.deployment_delete(&name))
}

fn configmap_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.configmap_delete(&name))
}

fn secret_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.secret_delete(&name))
}

// Namespace management functions
fn namespace_create(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.namespace_create(&name))
}

fn namespace_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.namespace_delete(&name))
}

fn namespace_exists(km: &mut KubernetesManager, name: String) -> Result<bool, Box<EvalAltResult>> {
    execute_async(km.namespace_exists(&name))
}

fn namespaces_list(km: &mut KubernetesManager) -> Result<Array, Box<EvalAltResult>> {
    let namespaces = execute_async(km.namespaces_list())?;
    let namespace_names: Array = namespaces
        .iter()
        .filter_map(|ns| ns.metadata.name.as_ref())
        .map(|name| Dynamic::from(name.clone()))
        .collect();
    Ok(namespace_names)
}

// Utility and convenience functions
fn resource_counts(km: &mut KubernetesManager) -> Result<Map, Box<EvalAltResult>> {
    let counts = execute_async(km.resource_counts())?;
    let mut rhai_map = Map::new();
    for (key, value) in counts {
        rhai_map.insert(key.into(), Dynamic::from(value as i64));
    }
    Ok(rhai_map)
}

fn deploy_application(
    km: &mut KubernetesManager,
    name: String,
    image: String,
    replicas: i64,
    port: i64,
    labels: Map,
    env_vars: Map,
) -> Result<String, Box<EvalAltResult>> {
    let labels_map: Option<std::collections::HashMap<String, String>> = if labels.is_empty() {
        None
    } else {
        Some(
            labels
                .into_iter()
                .map(|(k, v)| (k.to_string(), v.to_string()))
                .collect(),
        )
    };
    let env_vars_map = convert_rhai_map_to_env_vars(env_vars);
    execute_async(km.deploy_application(
        &name,
        &image,
        replicas as i32,
        port as i32,
        labels_map,
        env_vars_map,
    ))?;
    Ok(format!("Successfully deployed application '{name}'"))
}