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package com.base4j.util;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

/**
 * 字符集工具类
 *
 * @author xxx
 */
public class CharsetUtil {

    /**
     * ISO-8859-1
     */
    public static final String ISO_8859_1 = "ISO-8859-1";
    /**
     * UTF-8
     */
    public static final String UTF_8 = "UTF-8";
    /**
     * GBK
     */
    public static final String GBK = "GBK";

    /**
     * ISO-8859-1
     */
    public static final Charset CHARSET_ISO_8859_1 = Charset.forName(ISO_8859_1);
    /**
     * UTF-8
     */
    public static final Charset CHARSET_UTF_8 = Charset.forName(UTF_8);
    /**
     * GBK
     */
    public static final Charset CHARSET_GBK = Charset.forName(GBK);

    private CharsetUtil() {
        // 静态类不可实例化
    }

    /**
     * 转换为Charset对象
     *
     * @param charset 字符集，为空则返回默认字符集
     * @return Charset
     */
    public static Charset charset(String charset) {
        return StrUtil.isBlank(charset) ? Charset.defaultCharset() : Charset.forName(charset);
    }

    /**
     * 转换字符串的字符集编码
     *
     * @param source      字符串
     * @param srcCharset  源字符集，默认ISO-8859-1
     * @param destCharset 目标字符集，默认UTF-8
     * @return 转换后的字符集
     */
    public static String convert(String source, String srcCharset, String destCharset) {
        return convert(source, Charset.forName(srcCharset), Charset.forName(destCharset));
    }

    /**
     * 转换字符串的字符集编码
     *
     * @param source      字符串
     * @param srcCharset  源字符集，默认ISO-8859-1
     * @param destCharset 目标字符集，默认UTF-8
     * @return 转换后的字符集
     */
    public static String convert(String source, Charset srcCharset, Charset destCharset) {
        if (null == srcCharset) {
            srcCharset = StandardCharsets.ISO_8859_1;
        }

        if (null == destCharset) {
            srcCharset = StandardCharsets.UTF_8;
        }

        if (StrUtil.isBlank(source) || srcCharset.equals(destCharset)) {
            return source;
        }
        return new String(source.getBytes(srcCharset), destCharset);
    }

    /**
     * @return 系统字符集编码
     */
    public static String systemCharset() {
        return Charset.defaultCharset().name();
    }

}