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use std::prelude::v1::*;

use std::collections::btree_map::{Iter, IterMut};
use serde::{Deserialize, Serialize };
use std::fmt::{ Debug };
use std::collections::BTreeMap;
use std::sync::Arc;
use parking_lot::Mutex;
use crate::{RegistryService, Service};


#[derive(Debug, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Services {
    service_map: BTreeMap<String, crate::RegistryService>,
    key_map: BTreeMap<String, String>
}

impl Services {
    pub fn new() -> Self {
        Self {
            service_map: BTreeMap::new(),
            key_map: BTreeMap::new()
        }
    }

    pub async fn add(&mut self, service_arc: Arc<dyn Service>) {
        let identifier = service_arc.identifier();

        let key = service_arc.key();
        let registry_service = service_arc.register(service_arc.clone()).await;

        self.service_map.insert(identifier.to_string(), registry_service);
        self.key_map.insert(key.to_owned(), identifier.to_string());

        match service_arc.init_service().await {
            Ok(_) => {}
            Err(_) => {}
        }
    }

    pub async fn add_mut(&mut self, service_arc_mut: Arc<Mutex<dyn Service>>) {
        let service_locked = service_arc_mut.try_lock_for(core::time::Duration::new(10, 0));

        match service_locked {
            Some(mut service_mut) => {
                let identifier = service_mut.identifier();

                let key = service_mut.key();
                let registry_service = service_mut.register_mut(service_arc_mut.clone()).await;

                self.service_map.insert(identifier.to_string(), registry_service);
                self.key_map.insert(key.to_owned(), identifier.to_string());

                match service_mut.init_service_mut().await {
                    Ok(_) => {}
                    Err(_) => {}
                }
            }
            None => panic!("Failed to lock mut feature")
        }
    }

    pub fn remove(&mut self, identifier: String) {
        let service = self.service_map.remove(identifier.as_str());
        match service {
            None => (),
            Some(s) => { self.key_map.remove(s.key.as_str()); }
        };
    }

    pub fn get(&self, identifier: &str) -> Option<&RegistryService> {
        self.service_map.get(identifier)
    }

    pub fn get_mut(&mut self, identifier: &str) -> Option<&mut RegistryService> {
        self.service_map.get_mut(identifier)
    }

    pub fn find(&self, key: String) -> Option<&RegistryService> {
        match self.key_map.get(key.as_str()) {
            Some(result) => {
                self.get(result.as_str())
            },
            None => None
        }
    }

    pub fn list(&self) -> Iter<String, RegistryService> {
        self.service_map.iter()
    }

    pub fn list_mut(&mut self) -> IterMut<String, RegistryService> {
        self.service_map.iter_mut()
    }
}