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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

use std::{
    collections::HashMap,
    sync::{Arc, Mutex},
};

use itertools::Itertools;
use tracing::info;

use crate::{
    common::url::Url,
    registry::{memory_registry::MemoryNotifyListener, BoxRegistry, Registry},
    StdError,
};

pub type SafeRegistry = Arc<Mutex<BoxRegistry>>;
pub type Registries = Arc<Mutex<HashMap<String, SafeRegistry>>>;

pub const DEFAULT_REGISTRY_KEY: &str = "default";

pub trait RegistriesOperation {
    fn get(&self, registry_key: &str) -> SafeRegistry;
    fn insert(&self, registry_key: String, registry: SafeRegistry);
    fn default_registry(&self) -> SafeRegistry;
}

impl RegistriesOperation for Registries {
    fn get(&self, registry_key: &str) -> SafeRegistry {
        self.as_ref()
            .lock()
            .unwrap()
            .get(registry_key)
            .unwrap()
            .clone()
    }

    fn insert(&self, registry_key: String, registry: SafeRegistry) {
        self.as_ref().lock().unwrap().insert(registry_key, registry);
    }

    fn default_registry(&self) -> SafeRegistry {
        let guard = self.as_ref().lock().unwrap();
        let (_, result) = guard
            .iter()
            .find_or_first(|e| e.0 == DEFAULT_REGISTRY_KEY)
            .unwrap()
            .to_owned();
        result.clone()
    }
}

impl Registry for SafeRegistry {
    type NotifyListener = MemoryNotifyListener;

    fn register(&mut self, url: Url) -> Result<(), StdError> {
        info!("register {}.", url);
        self.lock().unwrap().register(url).expect("registry err.");
        Ok(())
    }

    fn unregister(&mut self, url: Url) -> Result<(), StdError> {
        self.lock().unwrap().register(url).expect("registry err.");
        Ok(())
    }

    fn subscribe(&self, url: Url, listener: Self::NotifyListener) -> Result<(), StdError> {
        self.lock().unwrap().register(url).expect("registry err.");
        Ok(())
    }

    fn unsubscribe(&self, url: Url, listener: Self::NotifyListener) -> Result<(), StdError> {
        self.lock().unwrap().register(url).expect("registry err.");
        Ok(())
    }
}