/*
 * 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.logging.log4j.core.net.ssl;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;

/**
 * Configuration of the KeyStore
 */
public class AbstractKeyStoreConfiguration extends StoreConfiguration<KeyStore> {
    private final KeyStore keyStore;
    private final String keyStoreType;

    public AbstractKeyStoreConfiguration(final String location, final String password, final String keyStoreType)
            throws StoreConfigurationException {
        super(location, password);
        this.keyStoreType = keyStoreType == null ? SslConfigurationDefaults.KEYSTORE_TYPE : keyStoreType;
        this.keyStore = this.load();
    }

    @Override
    protected KeyStore load() throws StoreConfigurationException {
        LOGGER.debug("Loading keystore from file with params(location={})", this.getLocation());
        try {
            if (this.getLocation() == null) {
                throw new IOException("The location is null");
            }
            try (final FileInputStream fin = new FileInputStream(this.getLocation())) {
                final KeyStore ks = KeyStore.getInstance(this.keyStoreType);
                ks.load(fin, this.getPasswordAsCharArray());
                LOGGER.debug("Keystore successfully loaded with params(location={})", this.getLocation());
                return ks;
            }
        } catch (final CertificateException e) {
            LOGGER.error("No Provider supports a KeyStoreSpi implementation for the specified type" + this.keyStoreType, e);
            throw new StoreConfigurationException(e);
        } catch (final NoSuchAlgorithmException e) {
            LOGGER.error("The algorithm used to check the integrity of the keystore cannot be found", e);
            throw new StoreConfigurationException(e);
        } catch (final KeyStoreException e) {
            LOGGER.error(e);
            throw new StoreConfigurationException(e);
        } catch (final FileNotFoundException e) {
            LOGGER.error("The keystore file(" + this.getLocation() + ") is not found", e);
            throw new StoreConfigurationException(e);
        } catch (final IOException e) {
            LOGGER.error("Something is wrong with the format of the keystore or the given password", e);
            throw new StoreConfigurationException(e);
        }
    }

    public KeyStore getKeyStore() {
        return this.keyStore;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + ((keyStore == null) ? 0 : keyStore.hashCode());
        result = prime * result + ((keyStoreType == null) ? 0 : keyStoreType.hashCode());
        return result;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final AbstractKeyStoreConfiguration other = (AbstractKeyStoreConfiguration) obj;
        if (keyStore == null) {
            if (other.keyStore != null) {
                return false;
            }
        } else if (!keyStore.equals(other.keyStore)) {
            return false;
        }
        if (keyStoreType == null) {
            if (other.keyStoreType != null) {
                return false;
            }
        } else if (!keyStoreType.equals(other.keyStoreType)) {
            return false;
        }
        return true;
    }

    public String getKeyStoreType() {
        return keyStoreType;
    }

}