//! 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 rhai::{Array, Dynamic, Engine, EvalAltResult, Map};

/// Helper function to execute async operations with proper runtime handling
fn execute_async<F, T>(future: F) -> Result<T, Box<EvalAltResult>>
where
    F: std::future::Future<Output = Result<T, KubernetesError>>,
{
    match tokio::runtime::Handle::try_current() {
        Ok(handle) => handle
            .block_on(future)
            .map_err(kubernetes_error_to_rhai_error),
        Err(_) => {
            // No runtime available, create a new one
            let rt = tokio::runtime::Runtime::new().map_err(|e| {
                Box::new(EvalAltResult::ErrorRuntime(
                    format!("Failed to create Tokio runtime: {}", e).into(),
                    rhai::Position::NONE,
                ))
            })?;
            rt.block_on(future).map_err(kubernetes_error_to_rhai_error)
        }
    }
}

/// Create a new KubernetesManager for the specified namespace
///
/// # Arguments
///
/// * `namespace` - The Kubernetes namespace to operate on
///
/// # Returns
///
/// * `Result<KubernetesManager, Box<EvalAltResult>>` - The manager instance or an error
fn kubernetes_manager_new(namespace: String) -> Result<KubernetesManager, Box<EvalAltResult>> {
    execute_async(KubernetesManager::new(namespace))
}

/// List all pods in the namespace
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
///
/// # Returns
///
/// * `Result<Array, Box<EvalAltResult>>` - Array of pod names or an error
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)
}

/// List all services in the namespace
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
///
/// # Returns
///
/// * `Result<Array, Box<EvalAltResult>>` - Array of service names or an error
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)
}

/// List all deployments in the namespace
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
///
/// # Returns
///
/// * `Result<Array, Box<EvalAltResult>>` - Array of deployment names or an error
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)
}

/// Delete resources matching a PCRE pattern
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
/// * `pattern` - PCRE pattern to match resource names against
///
/// # Returns
///
/// * `Result<i64, Box<EvalAltResult>>` - Number of resources deleted or an error
/// Create a pod with a single container
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the pod
/// * `image` - Container image to use
/// * `labels` - Optional labels as a Map
///
/// # Returns
///
/// * `Result<String, Box<EvalAltResult>>` - Pod name or an error
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))?;
    Ok(pod.metadata.name.unwrap_or(name))
}

/// Create a service
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the service
/// * `selector` - Labels to select pods as a Map
/// * `port` - Port to expose
/// * `target_port` - Target port on pods (optional, defaults to port)
///
/// # Returns
///
/// * `Result<String, Box<EvalAltResult>>` - Service name or an error
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))
}

/// Create a deployment
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the deployment
/// * `image` - Container image to use
/// * `replicas` - Number of replicas
/// * `labels` - Optional labels as a Map
///
/// # Returns
///
/// * `Result<String, Box<EvalAltResult>>` - Deployment name or an error
fn deployment_create(
    km: &mut KubernetesManager,
    name: String,
    image: String,
    replicas: i64,
    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 deployment =
        execute_async(km.deployment_create(&name, &image, replicas as i32, labels_map))?;
    Ok(deployment.metadata.name.unwrap_or(name))
}

/// Create a ConfigMap
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the ConfigMap
/// * `data` - Data as a Map
///
/// # Returns
///
/// * `Result<String, Box<EvalAltResult>>` - ConfigMap name or an error
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))
}

/// Create a Secret
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the Secret
/// * `data` - Data as a Map (will be base64 encoded)
/// * `secret_type` - Type of secret (optional, defaults to "Opaque")
///
/// # Returns
///
/// * `Result<String, Box<EvalAltResult>>` - Secret name or an error
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))
}

/// Get a pod by name
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the pod to get
///
/// # Returns
///
/// * `Result<String, Box<EvalAltResult>>` - Pod name or an error
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))
}

/// Get a service by name
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the service to get
///
/// # Returns
///
/// * `Result<String, Box<EvalAltResult>>` - Service name or an error
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))
}

/// Get a deployment by name
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the deployment to get
///
/// # Returns
///
/// * `Result<String, Box<EvalAltResult>>` - Deployment name or an error
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))
}

fn delete(km: &mut KubernetesManager, pattern: String) -> Result<i64, Box<EvalAltResult>> {
    let deleted_count = execute_async(km.delete(&pattern))?;

    Ok(deleted_count as i64)
}

/// Create a namespace (idempotent operation)
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
/// * `name` - The name of the namespace to create
///
/// # Returns
///
/// * `Result<(), Box<EvalAltResult>>` - Success or an error
fn namespace_create(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.namespace_create(&name))
}

/// Delete a namespace (destructive operation)
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the namespace to delete
///
/// # Returns
///
/// * `Result<(), Box<EvalAltResult>>` - Success or an error
fn namespace_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.namespace_delete(&name))
}

/// Check if a namespace exists
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
/// * `name` - The name of the namespace to check
///
/// # Returns
///
/// * `Result<bool, Box<EvalAltResult>>` - True if namespace exists, false otherwise
fn namespace_exists(km: &mut KubernetesManager, name: String) -> Result<bool, Box<EvalAltResult>> {
    execute_async(km.namespace_exists(&name))
}

/// List all namespaces
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
///
/// # Returns
///
/// * `Result<Array, Box<EvalAltResult>>` - Array of namespace names or an error
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)
}

/// Get resource counts for the namespace
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
///
/// # Returns
///
/// * `Result<Map, Box<EvalAltResult>>` - Map of resource counts by type or an error
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)
}

/// Delete a specific pod by name
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
/// * `name` - The name of the pod to delete
///
/// # Returns
///
/// * `Result<(), Box<EvalAltResult>>` - Success or an error
fn pod_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.pod_delete(&name))
}

/// Delete a specific service by name
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
/// * `name` - The name of the service to delete
///
/// # Returns
///
/// * `Result<(), Box<EvalAltResult>>` - Success or an error
fn service_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.service_delete(&name))
}

/// Delete a specific deployment by name
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
/// * `name` - The name of the deployment to delete
///
/// # Returns
///
/// * `Result<(), Box<EvalAltResult>>` - Success or an error
fn deployment_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.deployment_delete(&name))
}

/// Delete a ConfigMap by name
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the ConfigMap to delete
///
/// # Returns
///
/// * `Result<(), Box<EvalAltResult>>` - Success or an error
fn configmap_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.configmap_delete(&name))
}

/// Delete a Secret by name
///
/// # Arguments
///
/// * `km` - Mutable reference to KubernetesManager
/// * `name` - Name of the Secret to delete
///
/// # Returns
///
/// * `Result<(), Box<EvalAltResult>>` - Success or an error
fn secret_delete(km: &mut KubernetesManager, name: String) -> Result<(), Box<EvalAltResult>> {
    execute_async(km.secret_delete(&name))
}

/// Get the namespace this manager operates on
///
/// # Arguments
///
/// * `km` - The KubernetesManager instance
///
/// # Returns
///
/// * `String` - The namespace name
fn kubernetes_manager_namespace(km: &mut KubernetesManager) -> String {
    km.namespace().to_string()
}

/// 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("namespaces_list", namespaces_list);

    // Register resource creation methods (object-oriented style)
    engine.register_fn("create_pod", pod_create);
    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);

    Ok(())
}

// 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,
    ))
}