/*
 * Copyright © 2022 WireGuard LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

package com.wireguard.config;

import com.wireguard.config.BadConfigException.Location;
import com.wireguard.config.BadConfigException.Section;
import com.wireguard.util.NonNullForAll;

import java.net.MalformedURLException;
import java.net.URL;

import android.net.ProxyInfo;
import android.net.Uri;

@NonNullForAll
public final class HttpProxy {
    public static final int DEFAULT_PROXY_PORT = 8080;

    private ProxyInfo pi;

    protected HttpProxy(ProxyInfo pi) {
        this.pi = pi;
    }

    public ProxyInfo getProxyInfo() {
        return pi;
    }

    public String getHost() {
        return pi.getHost();
    }

    public Uri getPacFileUrl() {
        return pi.getPacFileUrl();
    }

    public int getPort() {
        return pi.getPort();
    }

    public static HttpProxy parse(final String httpProxy) throws BadConfigException {
        try {
            if (httpProxy.startsWith("pac:")) {
                return new HttpProxy(ProxyInfo.buildPacProxy(Uri.parse(httpProxy.substring(4))));
            } else {
                final String urlStr;
                if (!httpProxy.contains("://")) {
                    urlStr = "http://" + httpProxy;
                } else {
                    urlStr = httpProxy;
                }
                URL url = new URL(urlStr);
                return new HttpProxy(ProxyInfo.buildDirectProxy(url.getHost(), url.getPort() <= 0 ? DEFAULT_PROXY_PORT : url.getPort()));
            }
        } catch (final MalformedURLException e) {
            throw new BadConfigException(Section.INTERFACE, Location.HTTP_PROXY, httpProxy, e);
        }
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        if (pi.getPacFileUrl() != null && pi.getPacFileUrl() != Uri.EMPTY)
            sb.append("pac:").append(pi.getPacFileUrl());
        else {
            sb.append("http://").append(pi.getHost()).append(':');
            if (pi.getPort() <= 0)
                sb.append(DEFAULT_PROXY_PORT);
            else
                sb.append(pi.getPort());
        }

        return sb.toString();
    }
}