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package com.github.azbh111.utils.java.url;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.nio.charset.Charset;

/**
 * @author pyz
 * @date 2018/9/13 下午8:47
 */
public class UrlUtils {

    /**
     * 移除链接中的域名部分
     * http://host/x/x/... -> x/x/...
     *
     * @param url
     * @return
     */
    public static String removeHost(String url) {
        if (url == null || url.isEmpty()) {
            return url;
        }
        if (!url.startsWith("http")) {
            if (url.indexOf("/") == 0) {
                return url.substring(1);
            }
            return url;
        }
        url = url.replace("http://", "").replace("https://", "");
        int idx = url.indexOf("/");
        if (idx == -1) {
            return "";
        }
        return url.substring(idx + 1);
    }


    /**
     * 从url中获取host
     *
     * @param url
     * @return
     */
    public static String getHost(String url) {
        if (url == null) {
            return null;
        }
        if (url.startsWith("http://")) {
            url = url.substring("http://".length());
        } else if (url.startsWith("https://")) {
            url = url.substring("https://".length());
        } else {
            return null;
        }
        if (url.isEmpty()) {
            return null;
        }
        int dot = url.indexOf('/');
        if (dot == -1) {
            return url;
        }
        if (dot == 0) {
            return null;
        }
        return url.substring(0, dot);
    }

    /**
     * 从url上读取文件的后缀名
     * 
     * null -> null
     * 非法url ->
     * http://host/x/x/.../abc.jpg -> jpg
     * http://host/x/x/.../abc. ->
     * http://host/abc.jpg -> jpg
     * http://host/abc. ->
     * http://host/x/x/.../abc ->
     * http://host ->
     *
     * @param url
     * @return
     */
    public static String getFileSuffix(String url) {
        if (url == null) {
            return null;
        }
        int dot = url.indexOf("//");
        if (dot == -1) {
            return "";
        }
        int dot2 = url.lastIndexOf('/');
        if (dot2 == dot + 1) {
            return ""; // 非法的url
        }
        int dot3 = url.lastIndexOf('.');
        if (dot3 < dot2) {
            return "";
        }
        return url.substring(dot3 + 1);
    }


    public static String urlEncode(String url) {
        return urlEncode(url, Charset.defaultCharset());
    }

    public static String urlEncode(String url, Charset encoding) {
        try {
            return URLEncoder.encode(url, encoding.name());
        } catch (UnsupportedEncodingException ex) {
            throw new RuntimeException(ex);
        }
    }

    public static String urlDecode(String url) {
        return urlDecode(url, Charset.defaultCharset());
    }

    public static String urlDecode(String url, Charset encoding) {
        try {
            return URLDecoder.decode(url, encoding.name());
        } catch (UnsupportedEncodingException ex) {
            throw new RuntimeException(ex);
        }
    }

}