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package io.github.wj0410.cloudbox.tools.text;


import io.github.wj0410.cloudbox.tools.util.StringUtils;
import org.springframework.util.ObjectUtils;

/**
 * 字符串格式化
 *
 * @author wangjie
 */
public class StrFormatter {
    public static final String EMPTY_JSON = "{}";
    public static final char C_BACKSLASH = '\\';
    public static final char C_DELIM_START = '{';
    public static final char C_DELIM_END = '}';


    public static String format(final String strPattern, final Object... argArray) {
        if (StringUtils.isEmpty(strPattern) || ObjectUtils.isEmpty(argArray)) {
            return strPattern;
        }
        final int strPatternLength = strPattern.length();

        // 初始化定义好的长度以获得更好的性能
        StringBuilder sbuf = new StringBuilder(strPatternLength + 50);

        int handledPosition = 0;
        int delimIndex;// 占位符所在位置
        for (int argIndex = 0; argIndex < argArray.length; argIndex++) {
            delimIndex = strPattern.indexOf(EMPTY_JSON, handledPosition);
            if (delimIndex == -1) {
                if (handledPosition == 0) {
                    return strPattern;
                } else { // 字符串模板剩余部分不再包含占位符，加入剩余部分后返回结果
                    sbuf.append(strPattern, handledPosition, strPatternLength);
                    return sbuf.toString();
                }
            } else {
                if (delimIndex > 0 && strPattern.charAt(delimIndex - 1) == C_BACKSLASH) {
                    if (delimIndex > 1 && strPattern.charAt(delimIndex - 2) == C_BACKSLASH) {
                        // 转义符之前还有一个转义符，占位符依旧有效
                        sbuf.append(strPattern, handledPosition, delimIndex - 1);
                        sbuf.append(Convert.utf8Str(argArray[argIndex]));
                        handledPosition = delimIndex + 2;
                    } else {
                        // 占位符被转义
                        argIndex--;
                        sbuf.append(strPattern, handledPosition, delimIndex - 1);
                        sbuf.append(C_DELIM_START);
                        handledPosition = delimIndex + 1;
                    }
                } else {
                    // 正常占位符
                    sbuf.append(strPattern, handledPosition, delimIndex);
                    sbuf.append(Convert.utf8Str(argArray[argIndex]));
                    handledPosition = delimIndex + 2;
                }
            }
        }
        // 加入最后一个占位符后所有的字符
        sbuf.append(strPattern, handledPosition, strPattern.length());

        return sbuf.toString();
    }
}