use super::{Result, OrchestratorError};
use crate::models::{ServiceConfig, ManagedApp, AppStatus};
use crate::systemd::{ServiceGenerator, SystemCtl};
use crate::logger::get_logger;
use dashmap::DashMap;
use std::sync::Arc;

pub struct AppManager {
    apps: Arc<DashMap<String, ServiceConfig>>,
}

impl AppManager {
    pub fn new() -> Self {
        AppManager {
            apps: Arc::new(DashMap::new()),
        }
    }

    pub fn register_app(&self, config: ServiceConfig) -> Result<()> {
        let logger = get_logger();

        // Validar configuración
        config.validate()
            .map_err(|e| OrchestratorError::ValidationError(e))?;

        // Verificar si ya existe
        if self.apps.contains_key(&config.app_name) {
            logger.warning("AppManager", "Aplicación ya registrada", Some(&config.app_name));
            return Err(OrchestratorError::AppAlreadyExists(config.app_name.clone()));
        }

        // Verificar si el servicio ya existe en systemd
        if SystemCtl::is_service_exists(&config.service_name()) {
            logger.warning("AppManager", "Servicio systemd ya existe", Some(&config.service_name()));
            return Err(OrchestratorError::AppAlreadyExists(
                format!("El servicio {} ya existe en systemd", config.service_name())
            ));
        }

        logger.info("AppManager", &format!("Registrando aplicación: {}", config.app_name));

        // Generar archivo de servicio
        let service_content = ServiceGenerator::create_service(&config)?;
        ServiceGenerator::write_service_file(&config, &service_content)?;

        // Recargar daemon de systemd
        SystemCtl::daemon_reload()?;

        // Habilitar el servicio
        SystemCtl::enable(&config.service_name())?;

        // Guardar en memoria
        self.apps.insert(config.app_name.clone(), config.clone());

        logger.info("AppManager", &format!("Aplicación {} registrada exitosamente", config.app_name));

        Ok(())
    }

    pub fn unregister_app(&self, app_name: &str) -> Result<()> {
        let logger = get_logger();

        logger.info("AppManager", &format!("Desregistrando aplicación: {}", app_name));

        // Obtener configuración
        let config = self.apps.get(app_name)
            .ok_or_else(|| OrchestratorError::AppNotFound(app_name.to_string()))?;

        let service_name = config.service_name();
        drop(config); // Liberar el lock

        // Detener el servicio si está corriendo
        let _ = SystemCtl::stop(&service_name);

        // Deshabilitar el servicio
        let _ = SystemCtl::disable(&service_name);

        // Eliminar archivo de servicio
        ServiceGenerator::delete_service_file(&service_name)?;

        // Recargar daemon
        SystemCtl::daemon_reload()?;

        // Eliminar de memoria
        self.apps.remove(app_name);

        logger.info("AppManager", &format!("Aplicación {} desregistrada exitosamente", app_name));

        Ok(())
    }

    pub fn list_apps(&self) -> Vec<String> {
        self.apps.iter()
            .map(|entry| entry.key().clone())
            .collect()
    }

    pub fn get_app(&self, app_name: &str) -> Option<ServiceConfig> {
        self.apps.get(app_name).map(|entry| entry.clone())
    }

    pub fn app_exists(&self, app_name: &str) -> bool {
        self.apps.contains_key(app_name)
    }

    pub fn get_app_status(&self, app_name: &str) -> Option<ManagedApp> {
        let config = self.get_app(app_name)?;
        let systemd_status = SystemCtl::status(&config.service_name());

        // Por ahora retornamos información básica
        // El monitor.rs se encargará de enriquecer con PID, CPU, RAM
        Some(ManagedApp {
            name: app_name.to_string(),
            status: AppStatus::reconcile(false, &systemd_status),
            pid: None,
            cpu_usage: 0.0,
            memory_usage: 0,
            systemd_status,
            last_updated: chrono::Local::now().format("%Y-%m-%d %H:%M:%S").to_string(),
        })
    }
}

impl Default for AppManager {
    fn default() -> Self {
        Self::new()
    }
}