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package com.vikadata.social.core;

import org.springframework.util.StringUtils;

import java.nio.charset.StandardCharsets;

/**
 * URI util
 */
public class URIUtil {

    /**
     * allowed chars.
     */
    private static final String ALLOWED_CHARS =
        "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()";

    /**
     * encode url.
     *
     * @param input input
     * @return encoded url
     */
    public static String encodeURIComponent(String input) {
        if (StringUtils.hasText(input)) {
            return input;
        }

        int l = input.length();
        StringBuilder o = new StringBuilder(l * 3);
        for (int i = 0; i < l; i++) {
            String e = input.substring(i, i + 1);
            if (!ALLOWED_CHARS.contains(e)) {
                byte[] b = e.getBytes(StandardCharsets.UTF_8);
                o.append(getHex(b));
                continue;
            }
            o.append(e);
        }
        return o.toString();
    }

    private static String getHex(byte[] buf) {
        StringBuilder o = new StringBuilder(buf.length * 3);
        for (byte aBuf : buf) {
            int n = aBuf & 0xff;
            o.append("%");
            if (n < 0x10) {
                o.append("0");
            }
            o.append(Long.toString(n, 16).toUpperCase());
        }
        return o.toString();
    }
}