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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed 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 io.gravitee.common.util;

import io.gravitee.node.api.configuration.Configuration;
import io.vertx.core.http.HttpClientOptions;
import io.vertx.core.net.ProxyOptions;
import io.vertx.core.net.ProxyType;
import java.util.Objects;

/**
 * @author GraviteeSource Team
 */
public class VertxProxyOptionsUtils {

    static final String PROXY_HOST_PROPERTY = "system.proxy.host";
    static final String PROXY_PORT_PROPERTY = "system.proxy.port";
    static final String PROXY_TYPE_PROPERTY = "system.proxy.type";
    static final String PROXY_USERNAME_PROPERTY = "system.proxy.username";
    static final String PROXY_PASSWORD_PROPERTY = "system.proxy.password";

    public static void setSystemProxy(HttpClientOptions options, Configuration configuration) {
        options.setProxyOptions(buildProxyOptions(configuration));
    }

    public static ProxyOptions buildProxyOptions(Configuration configuration) {
        final ProxyOptions proxyOptions = new ProxyOptions();
        final StringBuilder errorMessageBuilder = new StringBuilder();

        try {
            proxyOptions.setHost(configuration.getProperty(PROXY_HOST_PROPERTY));
        } catch (Exception e) {
            appendErrorMessage(errorMessageBuilder, PROXY_HOST_PROPERTY, e);
        }

        try {
            proxyOptions.setPort(parseProxyPort(configuration.getProperty(PROXY_PORT_PROPERTY)));
        } catch (Exception e) {
            appendErrorMessage(errorMessageBuilder, PROXY_PORT_PROPERTY, e);
        }

        try {
            proxyOptions.setType(ProxyType.valueOf(configuration.getProperty(PROXY_TYPE_PROPERTY)));
        } catch (Exception e) {
            appendErrorMessage(errorMessageBuilder, PROXY_TYPE_PROPERTY, e);
        }

        proxyOptions.setUsername(configuration.getProperty(PROXY_USERNAME_PROPERTY));
        proxyOptions.setPassword(configuration.getProperty(PROXY_PASSWORD_PROPERTY));

        if (errorMessageBuilder.length() > 0) {
            throw new IllegalStateException(errorMessageBuilder.toString());
        }

        return proxyOptions;
    }

    private static int parseProxyPort(String proxyPortPropertyValue) {
        return Integer.parseInt(Objects.requireNonNull(proxyPortPropertyValue, "Proxy port may not be null"));
    }

    private static void appendErrorMessage(StringBuilder messageBuilder, String property, Exception e) {
        if (messageBuilder.length() > 0) {
            messageBuilder.append(", ");
        }
        messageBuilder.append(property).append(": ").append(e.getMessage());
    }
}