/*
 * 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.
 */
package org.apache.usergrid.security.shiro;

import com.fasterxml.jackson.core.type.TypeReference;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.apache.shiro.cache.CacheManager;
import org.apache.usergrid.persistence.cache.CacheFactory;
import org.apache.usergrid.security.shiro.utils.LocalShiroCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.HashMap;
import java.util.Map;
import java.util.Properties;


/**
 * Plugin Usergrid cache for Shiro.
 */
public class ShiroCacheManager implements CacheManager {

    private static final Logger logger = LoggerFactory.getLogger(ShiroCacheManager.class);

    @Autowired
    private Injector injector;

    private Map<String, ShiroCache> caches = new HashMap<>();

    @Autowired
    private Properties properties;

    private Integer cacheTtl = null; // specified in seconds

    private static final String CACHE_TTL_PROPERTY_NAME = "usergrid.auth.cache.time-to-live";

    private LocalShiroCache localShiroCache;

    public ShiroCacheManager(Injector injector, Properties properties) {

        this.injector = injector;
        this.properties = properties;
        this.localShiroCache = injector.getInstance(LocalShiroCache.class);
    }


    @Override
    public <K, V> Cache<K, V> getCache(String name) throws CacheException {
        ShiroCache shiroCache = caches.get(name);

        if (shiroCache == null) {

            if ("realm.authorizationCache".equals(name)) {

                TypeLiteral typeLit = new TypeLiteral<CacheFactory<String, UsergridAuthorizationInfo>>() {};

                shiroCache = new ShiroCache(
                    new TypeReference<UsergridAuthorizationInfo>() {},
                    (CacheFactory)injector.getInstance( Key.get(typeLit) ),
                    getCacheTtl(), localShiroCache);

            } else if ("realm.authenticationCache".equals(name)) {

                TypeLiteral typeLit = new TypeLiteral<CacheFactory<String, UsergridAuthenticationInfo>>() {};

                shiroCache = new ShiroCache(
                    new TypeReference<UsergridAuthenticationInfo>() {},
                    (CacheFactory)injector.getInstance( Key.get(typeLit) ),
                    getCacheTtl(), localShiroCache);

            } else {
                logger.error("Unknown Shiro Cache name: {}", name);
                throw new RuntimeException("Unknown Shiro Cache name: " + name);
            }

            caches.put(name, shiroCache);
        }
        return shiroCache;
    }

    private Integer getCacheTtl() {
        if ( cacheTtl == null ) {
            String cacheTtlString = properties.getProperty(CACHE_TTL_PROPERTY_NAME);
            try {
                cacheTtl = Integer.parseInt(cacheTtlString);
            } catch ( NumberFormatException nfe ) {
                cacheTtl = 3600;
                logger.error("Error reading property {}, setting cache TTL to {} seconds", CACHE_TTL_PROPERTY_NAME);
            }
        }
        return cacheTtl;
    }

    public Properties getProperties() {
        return properties;
    }

    public void setProperties(Properties properties) {
        this.properties = properties;
    }
}